Friday, November 14, 2014

Curious Quake Swarm in NW Nevada [UPDATED 3/17/2016]

Nobody at all is reporting on this, although it's no secret either. There is an oddly shallow and very active quake swarm occurring in NW Nevada, about 65 KM ESE of Lakeview, Oregon (as USGS reports it) and it has been going on now for over a week and a half.

The area the quakes are occurring in does not seem to have any significant human population, and appears to be mostly mountainous desert, overlain by igneous rocks of what I'm guessing are older than pliestocene. There isn't a lot of info on the area, much less any geological information I'm able to find.

In any case it appears to be a long series of very shallow quakes ranging in size from <1.0 to greater than 3.5. The area does appear to be on a spreading rift, and probably has a past history of volcanism, but there are no records to confirm this.

As these quakes have ranged in depth from <2km to near surface, I'd say we are looking at a purely teconic event, and nothing related to volcanism. Again, there are no news articles or blogs I'm able to find. Below is a screenshot.


Google Earth Screenshot of location of quake swarm using USGS overlay.

I'm purely writing about this out of curiosity, and want to keep speculation to a bare minimum. I wonder if any USGS people would like to comment on what they suspect this is? It's happened before!

*****UPDATE 8/21/2014*****
Looks like the media and geologists are finally taking notice of this quake swarm. So far, indications are that it is purely tectonic, but they don't know yet. The area has a history of tectonic activity, however this swarm appears to be unprecedented for the region. Here are the few reports I could find on this:

http://www.oregonlive.com/pacific-northwest-news/index.ssf/2014/08/seismologists_are_tracking_swa.html
http://www.rgj.com/story/news/2014/08/19/earthquake-swarm-northwest-nevada-see-map/14301965/

*****UPDATE 8/29/2014*****

The quake swarm in NW Nevada continues, adding a magnitude 3.8, 3.2, and numerous smaller quakes. All are occurring at depths less than 2km, and some (probably not manually reviewed, and auto-detected quakes) are occurring near or at the surface according to the data feed (which is probably not accurate). So far there is no analysis from USGS aside from what has been briefly mentioned in articles. This 'swarm' is interesting at least to me. There are volcanic basalt cliffs in the area, and it does appear to be part of a rift zone. There is little to no human population in the area, and I am wondering if anyone has visited it to gain some visual observations, or install more instrumentation. At this time, it's being reported that this is purely tectonic, and there are no reports of anything to suggest otherwise, however volcanic activity or dike intrusion can't be ruled out given the composition of the surrounding rocks. Something odd is going on up there.

*****UPDATE 11/6/2014*****
Surprisingly, this swarm is still active. A 4.7 magnitude quake, and a 4.6 are so far the largest quakes of the resurgent swarm. There is no explanation from USGS other than 'this is probably tectonic'. I tend to agree, as the quakes are extremely shallow, in some cases appearing to be so shallow it reads as '0.0 km depth'. However, the 4.7M quake was at a depth of around 5km, which can indicate some sort of volcanic origin. It's still way to early to tell what's going on, and without comprehensive analysis by USGS or a geologist, I still have no new info to really put forth, other than the swarm has been active now for months, which is certainly unusual. I can find no analysis, GPS charts, or otherwise to give any more details, but I will follow up when any info comes out (I am keeping my eye on this). Stay tuned!

*****UPDATE 11/14/2014*****

The quake swarm continues, with USGS releasing a statement saying they are finally going to be out in the area installing new equipment, which should give us a much better picture about whether this even is simply tectonic 'exfoliation' events, rifting, or perhaps even volcanic (which is highly unlikely, but not impossible). The duration of the swarm is still quite interesting, as it has now been occurring for several months now.

***** UPDATE 11/24/2014*****

Seismologist have indeed installed new equipment, hence the better depth readings. They are working out whether or not this is volcanic or tectonic, as reported in the above link:

"Bill Hammond of the university’s Nevada Geodetic Laboratory said that while some residents wonder if the latest swarm is related to an extinct volcano in the Sheldon wildlife refuge, experts think it stems from the region’s faults. However, conclusively ruling out a volcanic source will require the additional seismic and geodetic measurements closer to the events,"

*****UPDATE 1/19/2015*****

Amazingly this swarm is STILL ongoing with little to no difference in behavior. USGS is still installing new instrumentation in the area, according to the latest info. So far they have not updated their previous statements that this is tectonic in nature. I have no cause to disagree.

*****UPDATE 3/3/2015*****

I know I'm starting to sound like a broken record at this point, but yes, this quake swarm is STILL ongoing. And thus far STILL no concrete answers from USGS other than "This is probably tectonic". Quakes are still at depths ranging from 9km to under 3km, and raning in magnitude form quite small up to 4.8. Other nearby areas appear to be being tectonically disturbed by this activity, as there has been some action now to the ENE of the swarm a couple miles away. Absent GPS deformation data, all the data that exists is quake depths. USGS isn't raising any volcanic alarm bells, so it's probably safe to say still that this is not volcanic in nature, however that has not been ruled out. If it was volcanic however, you'd expect that the quake depths would get progressively shallower, which hasn't exactly occurred (they seem to be very random). Some theories abound as to whether this is related to stresses on the Cascadia fault, but I find this a bit unlikely. Yes, the fault is 'locked' and is generating an immense amount of pressure which will result (possibly soon) in a very large quake off the Oregon coast, but I see no reason to believe that the Nevada quakes are in any way related at this time.

Regardless, this is a very interesting swarm, as it has now been ongoing for over six months. I'll keep hovering over USGS for updates, but it seems they're sort of 'meh' about this swarm.

*****UPDATE 4/29/15*****
It has been several days since any meaningful quake activity has occurred in the region. It's impossible to know whether or not the swarm will continue at this point, but it seems a bit likely that it is at least dying down.

*****UPDATE 5/26/15*****

As of a few days ago, there as been little to no further quake activity in the area. At this time I think it's safe to assume that this very long lived quake swarm is over and is probably going to be quiet for a while. There is always a possibility of a few small quakes happening in the area for a while, but the sequence does at this time appear to be over. If USGS publishes a comprehensive report, I'll post it in another update or in the comments section.

*****UPDATE 7.16.2015*****
And the swarm returns. Largest in current series is magnitude 4.6 at 10km+ depth. It looks like this area will remain seismically unstable for quite a while. This swarm has now endured for nearly 1 year! There is still no definitive study done by USGS (probably due to budgetary concerns), so I can't really speculate on this at this time. Again, yes, the area has very old volcanism, and could be near to some very ancient (65,000,000 years plus) volcanic systems. However there is still no hard evidence that this is volcanic in nature. Some theories are now pointing to (and I'm not sure I agree but I'll throw it out there) pressure from the subducting Juan de Fuca plate along the Cascadia seismic zone. This 'could' be possible, however there is insufficient data to confirm this. My thought is that there is a nexus of seismic pressure causing old rocks to break. Swarms that go on for a year - if volcanic in nature - would typically have resulted in quakes getting shallower and shallower, not deeper. These have gone deeper and kind of hovered at around 10km, which suggests tectonic activity - but again, nothing has been *confirmed* without a doubt... Still keeping my eyes on it!

*****UPDATE 3/17/2016*****
It's been a long time since i posted an update to this swarm, as it has continued unabated until this week. The last quake detected above mag 1.0 occurred on 3/14/16. It could be that this series of tremors is finally coming to an end. 

61 comments:

  1. Do you know any more about this? We used to live in Lakeview so whenever I see our pop up on the earthquakes i notice. I see they've had about 31 earthquakes in the last 36 hours or so, including a couple of 4's.

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  2. The USGS is strangely silent on this, so what I would suspect is that no field studies have taken place due to the remote location. Given the extremely shallow depths that they are occuring (near the surface) I would suspect this is a Rio Grande Rift episode (spreading of the plate) and purely tectonic in nature. If it were magmatic, you'd expect to see quakes at depth (5-10km). The area, according to my research, has produced quakes up to mag 6.

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  3. It's happening again...for the past week...same location...same style

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    1. Yes, and added a 4.6 to the series as well. It is indeed something interesting to look at. Just wish there was more coverage so I could give you guys a definitive answer. It's highly annoying when swarms like this go unexplained by USGS.

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  4. This same area, in NW Nevada, used to be over the Yellowstone hot spot. Many many many moons ago. Before it was under NW Nevada; it was under the Lava Beds National Monument, in Northern California. Draw a line from this spot, to Yellowstone, and look at the chain of geologic formations along that line.

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  5. Have you looked, by chance, to see if there are any similarities between the Oregon and Oklahoma earthquakes? The Oklahoma earthquakes are pretty shallow (5-7km), which isn't as shallow as these in Oregon, but are still kinda shallow. Oklahoma hardly ever had earthquakes until a few years ago, now there is one almost every day.

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    1. That's a good question, and the answer is this. What's going on in NW Nevada is going on in a wilderness area, so this is purely tectonic in nature. Oklahoma does have fault lines, but these are being disturbed by the amount of fracking wastewater well injections, which are causing the quakes. What occurs is that they drill very far below the surface and pump water and chemical sludge into the ground, which can be acidic. This weakens existing faults, and underground limestone deposits, causing instability, and underground aquifer collapses. I suspect in the future they will start experiencing more sinkholes, and quakes up to 5.0 in the area, which has occurred already. So the answer is Nevada is purely natural tectonism, whereas Oklahoma has a man-made cause.

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  6. Is it interesting that the depth on these Oregon quakes has started increasing? I noticed the last several are 2-5km.

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    1. It is more than likely a result of USGS in the area installing new and more accurate equipment, as they did state they were sending a team out there to survey the area. The depth increase could mean anything, but as long as the quake occur above the lithosphere I would rule out any volcanic causes.

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  7. I have been receiving some comments that took issue with my statement about wastewater well injections in OK causing quakes. I did not publish these, as they contained offensive language. I will however point to an article in Scientific American which details this process. http://www.scientificamerican.com/article/wastewater-injection-caused-oklahoma-earthquakes/

    The data is clear and the debate is over. Fracking itself does not cause quakes, but pumping massive amounts of chemical laden water into a primed faulting system will disturb it. This is a known fact. There are many who work in the energy industry that disagree for political or corporate reasons. Such comments will not see the light of day on this blog.

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  8. Is the Virgin Valley Caldera in this area?

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    1. The VIrgin Valley caldera is to the East and SE of the current quake swarm region. I have found no evidence from USGS that this is related to volcanic going's on at this time. The depths are curious. If it were magma dike intrusion, we'd expect to see a lot of GPS deformation, which we're not seeing. Looks like this is common (yet spectacular) rifting tectonism in the area. You can see the scientific report on the Virgin Valley caldera here:

      http://iopscience.iop.org/1755-1315/3/1/012002/pdf/ees8_3_012002.pdf

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  9. This explains about quake .is the source of lava is from center of earth???????

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    1. While the area the quake is occurring in does indeed have volcanic materials, these are many millions of years old, and there is no current volcanism in the area. The current quakes are purely tectonic, according to USGS (who would certainly know better than I!)

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  10. How thick is the earth's crust in the area? The earthquakes in the area are at a max dept of 12km now.

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  11. Typically the Earth's crust is about 30km thick (generally speaking). In this specific area I would expect a little bit thinner, although not by much, since it is a rifting zone. There is still no definitive answer as to whether or not the quakes are tectonic or volcanic, although USGS seems 'pretty sure' it's just tectonic. Surface stresses can eventually make quakes go deeper in tectonic swarms. If it were magma dike intrusion, you'd expect quakes to get shallower over time.

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  12. Hi Matt, I took a look at the latest 200 earthquakes in the NW Nevada swarm on a 3D application and found that most of the earthquakes define a large finger starting at ~ 14KM almost to the surface. This does not look like a tectonic fault, more like a magma intrusion plume. Here is the link to the site hope this works! http://www.iris.washington.edu/3dv/index.html?caller=IEB&st=1970-01-01&et=2025-01-01&nma=0&xma=10&nde=0&xde=900&ob=time-desc&li=200&xla=41.9545&nla=41.7727&xlo=-119.4870&nlo=-119.8166&zm=12&mt=ter&sz=tiny

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    1. That is a fascinating way to look at these quakes and something I've always wanted to see when there are multiple quakes. I've noticed lately, at least in California, back in May, we had multiple 3 - 4.5 mag quakes going up and down the coast within hours of each other. I'd love to see this sort of thing on that scale

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  13. Hi Matt, I have a bit more data supporting a possible magma intrusion in the NW Nevada swarm. The location of the earthquake swarm is very close to the a new map generated by using a the magma mapping technique called magnetotellurics, see the article at the following link:
    http://oregonstate.edu/terra/2013/04/rethinking-yellowstone/
    The article has a very interesting 3D picture of the Snake River plane magma hot spot that extends all the way to Yellowstone. It also extends into western Oregon, and could have an offshoot to the NW Nevada site. The picture stops at 41deg North latitude and 118 deg West, showing a large magma plume but not far enough to match the current quake swarm, but it's close! What do you think?

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    1. Well the area for one, is definitely volcanic in origin, but I honestly couldn't jump to any conclusions basedon current data. USGS does say it is a tectonic event, and there doesn't seem to be any detectable harmonic tremor which would suggest magma movement or dike intrusion. The waveforms of the quakes show no long-period events or anything that doesn't look simply like rock fracture. What they're still missing is GPS deformation data, which I'm hovering over :) Hopefully we'll get that sometime soon, as that would be the very best indication of what is occurring.

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    2. Can't wait to see that data! Do you know if Yellow Mountain is volcanic in origin and when it was formed? The 3D graph of the last 200 quakes comes closest to the surface under Yellow Mountain.

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  14. I've been looking at this area with curiosity as well almost ever since I downloaded Google-Earth 2 months ago. I've only just now turned up this article though and am glad to know others are taking note. The area caught my eye because it reminds me of Iceland's East Volcanic Zone as viewed from satellite. I will be following this blog henceforth as well as this unfolding tectonic drama.

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  15. http://dutchsinse.com/4282015-volcanoes-in-nevada-erupt-steam-plumes-weather-service-observing-the-event/ Volcanic plumes have evidently been spotted by the weather service.

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    1. Unfortunately, Dutchsinse is a hack... There was indeed a weather system, however it is not volcanic. Please keep in mind, literally every so-called 'prediction' he has made has never turned out to be true. Dutchsinse is probably the worst 'disaster blogger' out there. He has incorrectly stated there was an eruption at Pisgah Crater (laughable, and also, false), and this is another example of 'clickbait'. While it is en vogue to be a conspiracy theorist regarding government agencies these days, I find it completely laughable that people would think USGS is somehow 'hiding the truth'. Sadly, people like Dutchsine are why I felt it necessary to publish sane volcano news in the face of so much disinformation. I would be willing to bet money that no such'steam eruption' occurred, and that this was in fact, just weather.

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  16. Hi Matt, It ain't over till it over. It looks like the quake frequency is picking up again ,close to the one year anniversary, but the magnitudes are smaller. And again, the depths range from ~12km to the surface, this is a strange swarm, even if it is tectonic!!

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  17. Yep ... just took a snapshot from this last week. Another cluster of late.

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    1. You're not kidding. A 4.6 in the mix now! Wow! This swarm is very very interesting, and STILL no definitive data from USGS on it :( I'd keep updating this blog, but wow, just seems like I'd be speculating more than is acceptable!

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  18. A 2002 paper "New geologic evidence for additional 16.5-15.5 Ma silicic calderas in
    northwest Nevada related to initial impingement of the Yellowstone
    hot spot" may provide answers to some of your good questions. Here's a link:
    http://iopscience.iop.org/1755-1315/3/1/012002/pdf/ees8_3_012002.pdf

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  19. This swarm has produced some deep quakes in the area, see the attached data below. All of the deep quakes have magnitudes below 3. The deepest was 124.5km, plus an additional two at 35 and 33km. Just wanted to point this out even though the 3 quakes are not in the middle of the swarm, but they are within 10 to 16km.
    Mag Depth Day Time Lat Lon
    km UTC
    2.1 13 7/17/2015 13:47:34 41.91 -119.65
    2.3 35.5 5/29/2015 9:14:26 41.81 -119.57
    2.2 13.5 5/10/2015 2:45:24 41.99 -119.62
    2.8 14.7 2/25/2015 12:50:52 41.96 -119.83
    2.2 13.6 12/10/2014 16:20:55 41.97 -119.64
    2.3 13.1 11/5/2014 16:32:53 41.85 -119.58
    2.2 124.5 10/1/2014 12:51:29 41.81 -119.79
    2.4 33 8/28/2014 13:44:08 41.74 -119.73
    2 13.6 8/28/2014 17:02:18 41.87 -119.65
    2.7 13.1 7/14/2014 22:39:35 41.88 -119.64

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  20. Are the Hot Springs in the area being affected? Any new hot springs showing up or being altered?

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  21. Another crazy swarm today! All between 8.4 - 10 km deep. There was the 4.6 on 7-16 and now a 4.5 today on 7-27

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  22. Reading through this I was thinking the same thing. It would be interesting to know for sure.

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  23. I have been following this and the Juan De Fuca sub-duction and I believe that the melted plate is providing the source for the magma chamber and thus a determinant time after a large plate slip earthquake there will be a bulge in the magma chamber causing another Yellowstone eruption. The Earthquake and Tsunami from 1703 and the plate sliding is the last major addition of magma to the chamber and then after a number of slip faults occur you then have enough magma for an eruption.

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  24. Hi Matt; More data to support tectonic activity. The link attached is from a Central Washington University researcher that more accurately located the quakes in this swarm and found that the same regions of the fault are rupturing repeatedly. I can't find access to the paper but only the poster session summary. http://digitalcommons.cwu.edu/source/2015/posters/10/

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  25. Just heard about the swarm on the news today! Recent article here, published today, August 11th: http://www.rgj.com/story/news/2015/08/11/unr-seismologists-earthquake-swarm-keep-shaking-nevada/31464145/

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  26. And this article was published today as well: http://sacramento.cbslocal.com/2015/08/11/seismologists-swarm-of-earthquakes-in-nevada-could-be-precursors-to-big-one/

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  27. I found out about this today because I was awakened from a nap by a slight but long tremor a few days back and this was the nearest activity to Medford OR I could find. It seems this activity has if anything intensified. I find it hard to believe that such a small region of activity could be tectonic rather than volcanic, and the region is riddled with volcanic systems.

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    1. That haven't erupted in 15 million years.

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    2. Richard, is it not true that Mt. Shasta had flows and eruptions only 10,000 years ago? It's technically not dormant. There was an eruption 200 years ago. "During the last 10,000 years Mount Shasta has erupted an average of every 800 years but in the past 4,500 years the volcano has erupted an average of every 600 years. The last significant eruption on Mount Shasta may have occurred about two centuries ago" So at least Mt. Shasta is bubbling. I know it's far, but it seems like all of this stuff is connected. There's all sorts of volcanic activity in these areas. I'd love to know more about the volcanic history of these areas running from Yellowstone west out toward Mt. Shasta

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    3. Here is a link describing the coastal subduction zone with volcanoes, and the Basin and Range region, with ages applied to each geologic formation. The basalt covering Sheldon Refuge is from the Pliocene, 5.3 to 2.6 million years ago. My previous 15 million year number was based on the oldest Yellowstone hot spot caldera. Matt, correct me if I'm wrong.
      http://geosphere.gsapubs.org/content/2/7/353/F9.expansion.html

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  28. Within at least a 50 mile radius of the Refuge there has been no volcanic activity for 15 million years. Shasta is ~150 miles away from the Sheldon National Antelope Refuge, and is actually closer to the coast ~100 miles. Distance does matter. The Refuge is within the Basin and Range Provence, and not in the line of volcanoes caused by the coastal subduction zone. The Basin and Range is being pulled apart by the push north west ward of the land mass that includes the Sierra Navada all the way to the San Andreas fault system. Matt, correct me if I'm wrong.

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  29. Here is a recent press release from UNR (University of Navada Reno), again reiterating this swarm is tectonic.
    http://newsroom.unr.edu/2015/08/11/university-of-nevada-reno-seismologists-monitor-year-long-earthquake-activity-in-far-northwest-nevada/

    I also received a separate email from UNR (Graham Kent) here it is:
    Yes … it’s been chugging along no doubt. 21 M4+s and over 225 M3s in little over a year—
    almost Oklahoma numbers, :>)

    This is certainly the most vigorous of all recorded swarms in Nevada, OK Gold Medal swarm,
    but not that unusual as there was a strong swarm near Hawthorne in 2011/2 and the Mogal
    swarm in NW Reno in 2008. So swarms in western NV and eastern CA are not that uncommon.
    One will see them down near the Salton Sea as well. Seems to be tectonic in nature—
    mostly normal events, no evidence of magma (i.e., long period tremor or maybe compressional
    events). Just an earthquake machine. Historical EQs between 1860 and 1954 in the M6-7 range
    many seemed to be preceded by significant swarms like in 1954—but we just don’t know what % go
    to fruition. Hope that helps.

    Cheers,
    Graham

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    1. A very good explanation from USGS (finally). Guess it pays to email them more! I'm in 100% agreement. This is after all part of the rifting in the mid-US that has gone on since... well, a very long time.

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  30. With all due respect, the swarms may be near the San Andres Fault but the swarms are associated with the magma chamber below the area. There are five lava domes in the area and are considered to be the only active volcanoes in Southern California. There are quite a few geothermal power plants in the area.

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    1. Here is an email clarification of the Salton Sea example from UNR's Graham:
      Hi Graham,
      The prior magma events you mention are recent, 1,800 years ago, according to the USGS web site:
      http://volcanoes.usgs.gov/volcanoes/salton_buttes/[volcanoes.usgs.gov]

      Yes +/- there’s been a fair amount of volcanic activity in the Holocene — just not recently.

      Another source of information I found describes the southern Salton Sea area as a sea floor spreading center except it's on land:
      http://www.sci.sdsu.edu/salton/VolcanicActivity.html[sci.sdsu.edu]

      Not really … having studied the East Pacific Rise and the Salton Trough… too much sediment in the latter so it’s really a much different system. No basalts here!

      Here is an excerpt from the Chapter above:
      This might become more clear if we describe the East Pacific Rise as a tear in earth's crust, and that sea floor spreading is opening the gap as a zipper would separate an opening in a garment, in this case from south to north. Off the west coast of Central America, deep submergence vessels, most notably the Alvin of the U.S. Navy, have extensivly observed and documented startling undersea volcanism, including smoking vents, ore formation and pillowy lava formations.
      Progressing north to the Imperial Valley, geophysical evidence suggests that the crust is very thin and that a large mass of super-heated rock exists just below the surface.
      All this is characteristic of a zone of sea floor spreading where new crust is being formed as molten material is brought to the surface of the earth. As the combined Gulf of California/Salton Trough structure is a transition zone between continental crust and oceanic crust, it follows that some magmatic intrusion and regional metamorphism is going on with concurrent volcanic activity. But surprisingly, it is limited. Possibly the great thickness of recent sediments in the basin act as a thermal barrier, confining the incipient volcanic activity and insulating the surface from its effects.
      Even so, the limited volcanism present in the valley includes a variety of phenomena, from hot springs to recent volcanic eruptions.
      Do you think the EQ in this area could also be related to magma close to the surface, plus to hydrothermal-assisted (hot water) quakes? Wouldn't this area eventually become a spreading center on land?


      No magma at the time. Just a very hot hydrothermal system. No spearing center anytime soon (as in millions of years). And the step over is not
      large enough given the sediment supply.

      THX
      Graham

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  31. 71 in the past 7 days including a 4.7

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  32. I think everyone is looking too deep. This is simply an isolated locked part of the Pacific Plate/ North American plate. It's just a blip in the bigger picture.

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  33. I have been watching this area for a year or two, and depending on several things plan to visit the area next spring/summer. Of interest to me, there are Hot Springs in the Hart Mountain and Alford desert area. According to USGS maps, Nevada has hundreds of faults but none of them show the activity that this area does. I'm a little concerned about getting in there, but it seems as if I drive down to Adel, Or it should be fairly simple. I am not a Geologist of any kind, just an old lady that's interested and has time on her hands.

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    1. There was a previous visitor to the Sheldon refuge area, see the link, it may give you some ideas https://www.youtube.com/watch?v=mnJ1QxSnSxg. Adel is a tiny place with just a Post office and gas pumps but no station. After that its all two lane country roads for 35 miles, make sure you have plenty of gas, water, and food; there is nothing that looks like civilization between Adel and the junction of Route 34 and 34A. Good Luck and tell us what you see and feel. The quakes are still going with a 4.1 yesterday.

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    2. It will likely be June or so before I get there. I was rear ended and my car is gone so I will have to buy one before I can go.

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  34. Update!! Major swarm of earthquakes in Lakevirw, OR the last 24 hours. MAJOR SWARM!! What is significant about this location?

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  35. Not being a Volcanologist at all, the last formation of a volcano where none had previously been was Parícutin, in Mexico in 1943. And the area had numerous previous volcanism sites. Perhaps this is just to far east? I would be interested to see the area in 100 years.

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  36. I just went over to the Quake page and screened for the last week, low magnitude. My gosh there are hundreds!

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  37. I saw your 3/17 update. The swarm is very slowly coming to an end, but still had a 1.6 on 3/31. A truly amazing swarm!

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  38. New swarm starting 4/20 60 miles east of Susanville.

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  39. New swarm starting 4/20 60 miles east of Susanville.

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  40. My little kid like to know more details about earth quake, as well as some real picture. Is there anybody can help me with it?
    SJSU

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  41. A 3.8 @ 10.6km today, the swarm is one month away from being 2 years old.

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  42. Well...what do ya all think now? - A Reno Resident

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  43. SWARM IN HENDERSON, NV
    All the way up to 5.7mag with down to 7.8 km deep. Going on since last night Woke us up all the way in San Jose, Ca.

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