Felt at my location in Northern CA, details follow
5.7 11km WNW of Greenville, California 2013-05-23 20:47:07-07:00
About 40 miles away from me.
Map: http://earthquake.usgs.gov/earthquakes/eventpage/nc71996911#summary
Whole cluster of quakes near Lake Almanor, odd.
12 quakes in that area last hour ranging from 2.5 to 5.7. 44 total if including lower than 2.5 magnitude Wonder if this is related to Mt. Lassen magma pool? Mt. Lassen is just 30mi to NW.
49 quakes now, note distance from cluster to Mt. Lassen. http://earthquake.usgs.gov/earthquakes/map/
- 3.0 8km WNW of Greenville, California 2013-05-23 22:46:56-07:00 0.0 km deep
- 2.0 7km NW of Greenville, California 2013-05-23 22:43:37-07:00 3.1 km deep
- 2.9 8km WNW of Greenville, California 2013-05-23 22:39:43-07:00 0.0 km deep
- 1.9 10km NW of Greenville, California 2013-05-23 22:37:21-07:00 9.7 km deep
- 2.0 8km WNW of Greenville, California 2013-05-23 22:28:26-07:00 8.8 km deep
- 1.9 11km WNW of Greenville, California 2013-05-23 22:27:16-07:00 2.5 km deep
- 3.1 13km SSW of Westwood, California 2013-05-23 22:24:42-07:00 0.0 km deep
- 2.3 10km WNW of Greenville, California 2013-05-23 22:23:26-07:00 1.3 km deep
- 2.4 8km WNW of Greenville, California 2013-05-23 22:19:34-07:00 0.9 km deep
- 2.9 9km NW of Greenville, California 2013-05-23 22:18:23-07:00 0.0 km deep
- 2.7 7km WNW of Greenville, California 2013-05-23 22:13:46-07:00 2.5 km deep
- 1.9 8km WNW of Greenville, California 2013-05-23 22:12:31-07:00 2.5 km deep
- 2.9 9km WNW of Greenville, California 2013-05-23 22:09:13-07:00 0.1 km deep
- 1.8 9km WNW of Greenville, California 2013-05-23 22:08:26-07:00 0.0 km deep
- 2.7 11km WNW of Greenville, California 2013-05-23 22:06:15-07:00 0.2 km deep
- 3.6 8km WNW of Greenville, California 2013-05-23 22:01:55-07:00 0.0 km deep
- 3.5 9km WNW of Greenville, California 2013-05-23 21:58:57-07:00 0.1 km deep
- 3.4 10km WNW of Greenville, California 2013-05-23 21:58:08-07:00 0.0 km deep
- 2.1 9km WNW of Greenville, California 2013-05-23 21:56:30-07:00 10.5 km deep
- 0.0 12km WNW of Greenville, California 2013-05-23 21:53:13-07:00 12.0 km deep
- 2.0 10km NW of Greenville, California 2013-05-23 21:52:24-07:00 7.2 km deep
- 2.2 10km WNW of Greenville, California 2013-05-23 21:49:49-07:00 0.2 km deep
- 0.0 13km WNW of Greenville, California 2013-05-23 21:45:52-07:00 4.1 km deep
- 2.8 10km NW of Greenville, California 2013-05-23 21:44:42-07:00 0.1 km deep
- 2.7 10km WNW of Greenville, California 2013-05-23 21:40:30-07:00 0.0 km deep
- 1.8 10km NW of Greenville, California 2013-05-23 21:35:03-07:00 7.0 km deep
- 2.1 9km WNW of Greenville, California 2013-05-23 21:34:22-07:00 2.5 km deep
- 2.2 11km WNW of Greenville, California 2013-05-23 21:34:00-07:00 6.2 km deep
- 2.4 11km WNW of Greenville, California 2013-05-23 21:32:56-07:00 1.3 km deep
- 1.7 9km SW of Westwood, California 2013-05-23 21:32:24-07:00 5.0 km deep
- 2.0 9km WNW of Greenville, California 2013-05-23 21:31:04-07:00 0.8 km deep
- 2.7 10km WNW of Greenville, California 2013-05-23 21:29:42-07:00 0.0 km deep
- 2.5 9km WNW of Greenville, California 2013-05-23 21:28:31-07:00 1.3 km deep
- 1.8 9km NW of Greenville, California 2013-05-23 21:27:38-07:00 0.0 km deep
- 2.6 10km WNW of Greenville, California 2013-05-23 21:25:19-07:00 0.0 km deep
- 2.0 12km SSW of Westwood, California 2013-05-23 21:24:43-07:00 1.7 km deep
- 2.3 10km NW of Greenville, California 2013-05-23 21:24:01-07:00 1.3 km deep
- 2.6 10km NW of Greenville, California 2013-05-23 21:23:40-07:00 5.1 km deep
- 0.0 11km WNW of Greenville, California 2013-05-23 21:23:06-07:00 6.9 km deep
- 2.0 10km NW of Greenville, California 2013-05-23 21:21:52-07:00 0.1 km deep
- 2.0 12km SSW of Westwood, California 2013-05-23 21:21:11-07:00 0.5 km deep
- 2.2 9km NW of Greenville, California 2013-05-23 21:18:31-07:00 1.3 km deep
- 2.2 10km NW of Greenville, California 2013-05-23 21:18:10-07:00 4.0 km deep
- 1.8 10km NW of Greenville, California 2013-05-23 21:16:32-07:00 17.6 km deep
- 2.3 10km WNW of Greenville, California 2013-05-23 21:15:15-07:00 0.2 km deep
- 2.4 13km WNW of Greenville, California 2013-05-23 21:10:24-07:00 0.7 km deep
- 2.8 10km NW of Greenville, California 2013-05-23 21:09:15-07:00 1.3 km deep
- 3.4 15km SE of Chester, California 2013-05-23 21:08:21-07:00 0.0 km deep
- 2.6 12km SSW of Westwood, California 2013-05-23 21:07:44-07:00 1.6 km deep
- 2.0 11km WNW of Greenville, California 2013-05-23 21:07:22-07:00 2.5 km deep
- 2.6 10km WNW of Greenville, California 2013-05-23 21:04:09-07:00 1.6 km deep
- 2.1 9km WNW of Greenville, California 2013-05-23 21:01:41-07:00 0.7 km deep
- 3.5 10km NW of Greenville, California 2013-05-23 20:55:30-07:00 0.0 km deep
- 2.2 9km NW of Greenville, California 2013-05-23 20:55:11-07:00 3.4 km deep
- 5.7 11km WNW of Greenville, California 2013-05-23 20:47:08-07:00 11.0 km deep
- 1.9 12km ENE of East Quincy, California 2013-05-23 04:17:24-07:00 1.5 km deep
Gigi says:
May 23, 2013 at 9:40 pm
Even if fracking triggered earthquakes, that would be a good thing.
Why? Because that would relieve built-up tension and let it go gently rather than waiting for the “big one”.
For example, the Wasatch Front in Utah has a seismic gap that has been building for some time. Once that thing lets loose, watch out. Much better to have frequent, low-level quakes so the big ones don’t gather as much strength.
Greg Goodman says:
May 24, 2013 at 5:49 am
For example here is a plot of Jupiter, Neptune and Uranus against Sunspot area 1875-2040
http://thetempestspark.files.wordpress.com/2013/05/solar-activity-mod-1.gif
Sparks, looks interesting but you can’t “plot a planet”. How is this curve calculated? Is it linked to an article ?
The orbital plot [N] is a function of distance and time (orange) in astronomical units, it is calculated first by measuring the distance between Jupiter and Uranus [N1] over the period from 1875 -2040 then measuring the distance between Neptune and Uranus [N2] over the period from 1875 -2040. The formula is N=N1-N2.
The plot shows the precise frequency and distance between the planets over a period orbiting the sun.
Didn’t feel a thing in Houston.
The stitches are starting to pop. Anthony may soon have some beachfront property.
This is several comments I made yesterday and today at Newsvine. I have kept track of quakes for several years now.
goldminor Author commented yesterday
#66
comment author avatar
Fiji had a 7.4 quake about 90 minutes ago. No tsunami alert has been issued. This is one of those large quakes that is not followed by aftershocks as of yet. Greece had a 4,8 earlier today and the Med is running above average. I would say that there will be another event or several above 7.0 in the next 2 days
goldminor Author commented 4 hours ago
#67
comment author avatar
What do I think? There was an 8.3 quake in the Sea of Ohkotsk last night and there was a rather unusual 5.7 in Greenville California. This is a small town in gold country that sits around 3,000ft in the north of the Sierra Nevadas. This is the first quake in this area in the 2+ years that I have been watching. There have been numerous aftershocks on this quake as well as some aftershocks of the big 8.3 event. Greenville is slightly south and east from Mt Lassen, a potentially active volcano.
____________________________________________________________________________
The Sea of Ohkotsk had a 6.8 aftershock after the very deep 8.3. There have been numerous 4s and some 5s. This has been a strong active period for quakes.
I live straight across the Sacramento Valley from the Greenville quakes. I have dredged in that area a few times.
@usgs Greenville, California area earthquakes are tectonic, not magmatic. Historic seismicity outlines fault zone: http://earthquake.usgs.gov/research/external/reports/08HQGR0027.pdf …
Enough with the “kooky” speculation (fracking, moon tides, etc.)!
From: http://www.wired.com/wiredscience/eruptions
Earthquake Swarm Near Greenville in California
By Erik Klemetti
05.24.13
1:32 PM
I’ve been getting a lot of questions about the current Greenville, California earthquake swarm. This is likely due to the fact that the swarm is in the vicinity of the Lassen Volcanic Center, which is ~50 km to the northwest of these earthquakes. Now, I don’t like to delve too much into earthquakes that aren’t volcanically-related here, but I thought I’d share some information on the earthquakes just to help with some of these questions.
First, these earthquakes have nothing to do with the Lassen Volcanic Center (LVC). They are centered much too far away to have any connection. They might be felt up there in the Park, but there is no reason to think that there is any relationship between earthquakes and the LVC. You can check out the LVC’s seismicity on the webicorders for the area — right now they’re picking up a lot of the shaking going on down at Greenville.
Second, looking at the technical information on the largest of the earthquakes in the swarm, they look to be mainly strike-slip earthquakes. This means that two pieces of crust are sliding next to each other (like the San Andreas fault system). The depths of the earthquakes are fairly shallow, all within the top 11 km of the crust, many much shallower than 11 km.
Third, thanks to a suggestion by Becky Oskin, they look like they might be related to the Mohawk Valley fault system. I found a research report by the Nevada Bureau of Mines and Geology on the Mohawk Valley system and marked where this swarm is occurring and you can see that one of the faults (in purple; above) does run up to the southern shores of Lake Almanor, the location of the current swarm. You can see from the figure above that shows seismicity in the area between 1986-2006 that it is actually a fairly active fault system, so the earthquakes here should be no surprise — this swarm was just started by an earthquake of a magnitude larger than many along the Mohawk Valley system. The fault system is dominantly strike-slip, so this swarm also fits in with their style of motion as well.
Maybe new volcano will form. It happened in a field in Mexico (1943-52 Paricutin eruption):
http://www.volcanodiscovery.com/paricutin.html
Why are you all looking at a volcanic centre 30 miles away? These quakes are all shallow and a very small distance from the deepest part of the dam and the dam wall. Run away?
otropogo says:
May 24, 2013 at 1:17 pm
————————————-
No worries, that part of the infrastructure is irrelevant. The NAFTA superhighway goes up the centre of the US from Mexico to Canada, along the North America craton. Sections of the east and west will be serviced by “inland” ports or nodes from the superhighway or from coastal ports, as long as they persist to exist..
As this is supposed to be about the quake in Northern Cal, up by Lassen Volcano, I will respond to a few questions about the geology of the area around Lake Almanor, Plumas County. After the 1849 gold rush petered out– this area was where the second gold rush occured and continued for quite some time. La Porte, a town in Plumas county not far from where we are talking about, has a population of about 15 people now, but at the height of the second gold rush in this area La Porte was called home by 10,000 people. Lots of green serpentine (Calif State Rock) laying around. Plumas county found $60 million in gold in (the year) 1900 US Dollars which today would be over $1.5 billion. Gold was still being found in significant quantity in Plumas County when the San Francisco earthquake hit in 1906, and a lot of Plumas Co. gold/money went into the rebuilding of S.F. And remember, Lassen the Volcano did erupt in 1915 in a fairly major way, and is a part of the Cascade range of Volcano’s that include Mt St. Helens.
Greg Goodman says:
May 24, 2013 at 7:02 am
…….
Hi Greg
Yes I got carried away, it is about 27-28 (2×13-14) days, related to the solar rotation.
Polar diagram
http://www.vukcevic.talktalk.net/LFC7.htm
is based on Debrecen library photographic data, I got file somewhere on my old hard drive. This is well known solar property; Dr. Svalgaard has a paper going back to 1970s.
Could the earthquake swarms indicate magma flow into dormant volcanoes?
http://vulcan.wr.usgs.gov/Imgs/Gif/MSH/SlideSet/1.gif
There really needs to be a string of somewhat deeper quakes for a while to be magma. I seem to remember something like this ten years ago. They kept sending me through there…. hmmmm…. trying to get rid of me! I don’t know why anyone would try to get rid of an adorable insulting hillbilly. 🙂
good enough.
But, the swarm persists; “Quakeville” continues to shack rattle and roll…
When I was younger I went on a date with a brilliant computer geek. We snuck into a Portland patk after the gates had closed and watched the moon rise…later he said he felt the Earth move. I told him I hadn’t felt it. After a few days it dawned on me he was probably not talking about an earthquake.
Anthony, for the sake of the Internet’s scant supply of sanity, please abandon CAcooland before it flips in slabs and douses the slabs.
Brian H,
More insanity from the Peoples’ Democratic Socialist Soviet of California.
dbstealey says:
May 26, 2013 at 12:01 pm
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WTF dude, is there too much lead, arsenic, and aluminum in the water system in Califoolish or what?
http://www.fourmilab.ch/earthview/pacalc.html
Perigee Apogee
——————————— ———————————
Jan 10 10:27 360047 km N-1d 9h Jan 22 10:53 405311 km F-4d17h
Feb 7 12:10 365313 km N-2d19h Feb 19 6:31 404473 km F-6d13h
Mar 5 23:21 369953 km N-5d20h Mar 19 3:14 404261 km N+7d 7h
Mar 31 3:56 367493 km F+3d18h Apr 15 22:23 404864 km N+5d12h
Apr 27 19:49 362267 km F+1d23h May 13 13:32 405826 km N+3d13h
May 26 1:46 358374 km F+ 21h Jun 9 21:41 406486 km – N+1d 5h
Jun 23 11:11 356989 km ++ F- 0h Jul 7 0:37 406491 km — N-1d 6h
Jul 21 20:28 358401 km F- 21h Aug 3 8:54 405833 km N-3d12h
Aug 19 1:27 362264 km F-2d 0h Aug 30 23:47 404882 km N-5d11h
Sep 15 16:35 367387 km F-3d18h Sep 27 18:18 404308 km N-7d 6h
Oct 10 23:07 369811 km N+5d22h Oct 25 14:26 404560 km F+6d14h
Nov 6 9:29 365361 km N+2d20h Nov 22 9:51 405445 km F+4d18h
Dec 4 10:16 360063 km N+1d 9h Dec 19 23:50 406267 km + F+2d14h
Well the next full moon coincides with the closest perigee of the year, although this is close to the solstice, meaning the solar gravity field is at its weakest point.
The lunar tidal stress on the mantle is greatest at perigee. There is about 5% variation between perigee and apogee in distance. Since tidal forces are reckoned to vary with the inverse cube that makes it about 15% .
Full or new moon marks the alignment of the lunar and solar tidal forces
Hence the circa 14 days ripple visible in Leif’s plot:
http://www.leif.org/research/Earthquakes-Perigee.png
Should be interesting to see whether there is more activity around .Jun 23.