Archive for earthquake swarm

New Earthquake Swarm Hits Hawthorne Nevada April 10-18, 2011

Posted in Uncategorized with tags , , , , , , , , , , , on April 13, 2011 by highboldtage

update apr 27 4.3 quake:  http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/nn00335238.html

update april 21 800 pdt  the swarm seems to be waning this morning both in intensity and frequency, with 11 quakes total on the 20th and only 3 so far this morning.  We’ll see how it goes the next couple of days.  There was a cluster of quakes down on the border last night near Mexicali, over four hundred miles south of Hawthorne.

update apr 19  “To better monitor the evolving swarm, members from the Nevada Seismological Laboratory, working with the Nevada Division of Emergency Management, have deployed additional seismometers around this sequence to upgrade earthquake locations and, in particular, the depth of earthquake initiation.

“A shallower depth would have the potential for greater damage to buildingsin the area,” Kent said. “The more information we have about this swarm, and more accurately know the magnitude and the depth, the better emergency services can prepare and respond. Given the occurrence of volcanic activity in the region during the past 10,000 years, seismologists will also be looking for signs of tremor in case there is a magmatic origin to this sequence. Evidence thus far points to a tectonic origin, but all scenarios must be investigated.””

more: 

http://yubanet.com/regional/Swarm-of-400-quakes-hits-near-Hawthorne-Nev-outpaces-2008-Mogul-Somersett.php
 

update april 18 mon:  3.0 quake  mammoth lakes (50 miles s of hawthorne and near the long valley caldera.)  http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/nc71560731.html 

background:  “Known quake activity in this area goes back as far as 1974. Since 1974, the CISN (California Integrated Seismic Network) has located more than 3,200 quakes within the box defined by latitude 37.85º – 38.15º, longitude -119.25º – -118.5º. During the past 20 years 170 quakes had magnitudes that exceeded 3.0. The largest quake in the area was a 6.3M that occurred in 1934 south of the Hawthorn swarm.”

more @ link

http://www.syzygyjob.com/smf/index.php?PHPSESSID=0a29fce2031bfd6694f541bfa8de8e59&topic=259703.0

 

update apr 17  It seems for the last week 24/7 the area has experience a quake every 40 min or so 24/7.  Most of the substantial 3+ mag quakes are at a depth of 12 to 15 miles, with many of the lighter quakes at shallower depths.  On the first day April 10 of this current swarm there were 4 substantial quakes in the 9 to 10 mile depth and one at 6 miles.  So the trend appears to be currently deeper than at the onset.  Also there have been swarms at this location in the past, I think as recently as January this year and maybe in 2004 as well.  I will look for some solid links on previous swarms @ Hawthorne.

update:  Here is some background.  To the north of these quakes you will see Walker Lake.  Walker Lake is named after the Walker Lane, a geologic trough feature that runs from southern Oregon through Nevada and ends in southern California near Death Valley.  from wikipedia:

The Walker Lane is a geologic trough roughly aligned with the California/Nevada border southward to where Death Valley intersects the Garlock Fault, a major left-lateral strike-slip fault. The north-northwest end of the Walker Lane is between Pyramid Lake in Nevada and California’s Mount Lassen[1][2] where the Honey Lake Fault meets the transverse tectonic zone forming the southern boundary of the Modoc Plateau and Columbia Plateau provinces. The Walker Lane takes up 15 to 25 percent of the boundary motion between the Pacific Plate and the North American Plate, the other 75 percent being taken up by the San Andreas Fault system to the west.[3][4] The Walker Lane may represent an incipient major transform fault zone which could replace the San Andreas as the plate boundary in the future.[5]

The Walker Lane deformation belt accommodates nearly 12 mm/yr of dextral shear between the Sierra Nevada-Great Valley Block and North America.[6][7] The belt is characterized by the northwest-striking trans-current faults and co-evolutionary dip-slip faults formed as result of a spatially segregated displacement field.[8]

http://en.wikipedia.org/wiki/Walker_Lane

update april 16 1800  PDT mag 4.6 one of the largest yet.

4.6
Date-Time
  • Sunday, April 17, 2011 at 00:45:37 UTC
  • Saturday, April 16, 2011 at 05:45:37 PM at epicenter
Location 38.400°N, 118.717°W
Depth 0 km (~0 mile) set by location program
Region NEVADA
Distances
  • 16 km (10 miles) SSW (210°) from Hawthorne, NV
  • 19 km (12 miles) WNW (302°) from Qualeys Camp, NV
  • 29 km (18 miles) SE (128°) from Wichman, NV
  • 240 km (149 miles) E (93°) from Sacramento, CA
Location Uncertainty Error estimate not available
Parameters NST= 57, Nph= 57, Dmin=55.3 km, Rmss=0 sec, Gp=108°,
M-type=local magnitude (ML), Version=7
Source
Event ID nn00333401

 

http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/nn00333401.html

site of todays (4.6 4-16) looks like an open pit strip mine to me:

update – swarm continues for 5th day, Univ. of Nevada sending in more monitoring equipment:

http://urlet.com/good.graveyard or:

http://www.rgj.com/article/20110415/NEWS07/110415022/1459/news50/Six-earthquakes-jolt-Hawthorne-area-today-seismological-lab-sending-equipment-focus-quakes

update:  ““the (U.S.) Army is drilling two geothermal wells at its Hawthorne Army Depot to power a generating plant that will be capable of providing electricity to approximately 50,000 homes in Western and Northern Nevada as well as the base, according to a senior Pentagon official.”

http://thinkgeoenergy.com/archives/1189

The earthquake swarm that began on April 10 and then subsided for a day has restarted on the 13th.

4 earthquakes of 3 and 4  magnitude in less than an hour.

3.1 2011/04/13 15:59:19 38.379N 118.738W 16.6 19 km (12 mi) SSW of Hawthorne, NV

1.4 2011/04/13 15:37:55 38.385N 118.745W 18.2 19 km (12 mi) SW of Hawthorne, NV

4.2 2011/04/13 15:16:08 38.386N 118.742W 15.4 19 km (12 mi) SW of Hawthorne, NV

3.6 2011/04/13 15:15:20 38.379N 118.752W 12.0 20 km (12 mi) SW of Hawthorne, NV

4.4 2011/04/13 15:10:08 38.371N 118.748W 13.1 20 km (13 mi) SSW of Hawthorne, NV

http://earthquake.usgs.gov/earthquakes/recenteqscanv/FaultMaps/118-38_eqs.html

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Earthquake Swarm Hawthorne Nevada April 10

Posted in Uncategorized with tags , , , , on April 10, 2011 by highboldtage

UPDATE @ https://highboldtage.wordpress.com/2011/04/13/new-earthquake-swarm-hits-hawthorne-nevada-april-13-2011/ OR http://urlet.com/outlaw.flexibility

Dozens of small earthquakes, seven of 3 and 4 magnitude, starting this afternoon, april 10.  Hawthorne is the site of the world’s largest ammunition dump.  This is maybe 60 miles due north of Mammoth Lakes magma dome.

http://earthquake.usgs.gov/earthquakes/recenteqscanv/FaultMaps/119-38_eqs.html

source: http://www.seismo.unr.edu/Earthquake

7.2 Magnitude Earthquake Offshore Honshu Japan

Posted in Uncategorized with tags , , , , , on March 8, 2011 by highboldtage

tsunami update-

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION LAT LON TIME AMPL PER

OFUNATO HONSHU JP 39.0N 141.8E 0311Z 0.54M / 1.8FT 12MIN

LAT – LATITUDE (N-NORTH, S-SOUTH)

LON – LONGITUDE (E-EAST, W-WEST)

TIME – TIME OF THE MEASUREMENT (Z IS UTC IS GREENWICH TIME)

AMPL – TSUNAMI AMPLITUDE MEASURED RELATIVE TO NORMAL SEA LEVEL.

IT IS …NOT… CREST-TO-TROUGH WAVE HEIGHT.

VALUES ARE GIVEN IN BOTH METERS(M) AND FEET(FT).

PER – PERIOD OF TIME IN MINUTES(MIN) FROM ONE WAVE TO THE NEXT.

EVALUATION

SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. IT MAY HAVE

BEEN DESTRUCTIVE ALONG COASTS NEAR THE EARTHQUAKE EPICENTER. FOR

THOSE AREAS – WHEN NO MAJOR WAVES ARE OBSERVED FOR TWO HOURS

AFTER THE ESTIMATED TIME OF ARRIVAL OR DAMAGING WAVES HAVE NOT

OCCURRED FOR AT LEAST TWO HOURS THEN LOCAL AUTHORITIES CAN ASSUME

THE THREAT IS PASSED. DANGER TO BOATS AND COASTAL STRUCTURES CAN

CONTINUE FOR SEVERAL HOURS DUE TO THE CONTINUING SEA LEVEL

CHANGES AND RAPID CURRENTS. AS LOCAL CONDITIONS CAN CAUSE A WIDE

VARIATION IN TSUNAMI WAVE ACTION THE ALL CLEAR DETERMINATION MUST

BE MADE BY LOCAL AUTHORITIES.

NO TSUNAMI THREAT EXISTS FOR OTHER COASTAL AREAS IN THE PACIFIC

ALTHOUGH SOME OTHER AREAS MAY EXPERIENCE SMALL NON-DESTRUCTIVE

SEA LEVEL CHANGES LASTING UP TO SEVERAL HOURS.

THIS WILL BE THE FINAL BULLETIN ISSUED FOR THIS EVENT UNLESS

ADDITIONAL INFORMATION BECOMES AVAILABLE.

THE JAPAN METEOROLOGICAL AGENCY MAY ALSO ISSUE TSUNAMI MESSAGES

FOR THIS EVENT TO COUNTRIES IN THE NORTHWEST PACIFIC AND SOUTH

CHINA SEA REGION. IN CASE OF CONFLICTING INFORMATION… THE

MORE CONSERVATIVE INFORMATION SHOULD BE USED FOR SAFETY.

THE WEST COAST/ALASKA TSUNAMI WARNING CENTER WILL ISSUE PRODUCTS

FOR ALASKA…BRITISH COLUMBIA…WASHINGTON…OREGON…CALIFORNIA.

http://www.weather.gov/ptwc/text.php?id=pacific.2011.03.09.035716

update: aftershocks

MAG UTC DATE-TIME

y/m/d h:m:s LAT

deg LON

deg DEPTH

km Region

MAP 5.3 2011/03/09 04:45:54 38.543 142.740 27.0 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 5.7 2011/03/09 04:37:03 38.666 142.991 25.5 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 5.2 2011/03/09 04:32:10 38.727 143.001 32.1 OFF THE EAST COAST OF HONSHU, JAPAN

MAP 4.8 2011/03/09 04:15:39 38.857 142.658 12.6 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 5.2 2011/03/09 04:05:53 38.870 142.420 10.9 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 5.0 2011/03/09 03:19:00 38.795 142.962 19.9 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 5.2 2011/03/09 03:08:35 38.339 143.097 24.4 OFF THE EAST COAST OF HONSHU, JAPAN

MAP 5.6 2011/03/09 02:57:16 38.402 142.825 17.5 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 7.2 2011/03/09 02:45:18 38.510 142.792 14.1 NEAR THE EAST COAST OF HONSHU, JAPAN

http://earthquake.usgs.gov/earthquakes/recenteqsww/Maps/10/140_40_eqs.php

Magnitude 7.2 – OFF THE EAST COAST OF HONSHU, JAPAN

2011 March 09 02:45:17 UTC

Earthquake Details

  • This event has been reviewed by a seismologist.
Magnitude 7.2 (Preliminary magnitude — update expected within 15 minutes)
Date-Time
  • Wednesday, March 09, 2011 at 02:45:17 UTC
  • Wednesday, March 09, 2011 at 12:45:17 PM at epicenter
Location 38.300°N, 143.300°E
Depth 10 km (6.2 miles) set by location program
Region OFF THE EAST COAST OF HONSHU, JAPAN
Distances
  • 211 km (131 miles) E (88°) from Sendai, Honshu, Japan
  • 245 km (152 miles) SE (129°) from Morioka, Honshu, Japan
  • 252 km (156 miles) NE (56°) from Iwaki, Honshu, Japan
  • 430 km (267 miles) NE (46°) from TOKYO, Japan
Location Uncertainty Error estimate not available
Parameters NST= 6, Nph=0, Dmin=0 km, Rmss=0 sec, Gp=205°,
M-type=”moment” magnitude from initial P wave (tsuboi method) (Mi/Mwp), Version=B
Source
Event ID pt11068000

http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/pt11068000.php

To: U.S. West Coast, Alaska, and British Columbia coastal regions

From: NOAA/NWS/West Coast and Alaska Tsunami Warning Center

Subject: Tsunami Information Statement #1 issued 03/8/2011 at 6:55PM PST

A strong earthquake has occurred, but a tsunami IS NOT expected along the California, Oregon, Washington, British Columbia, or Alaska coast. NO tsunami warning, watch or advisory is in effect for these areas.

Based on the earthquake magnitude, location and historic tsunami records, a damaging tsunami IS NOT expected along the California, Oregon, Washington, British Columbia, and Alaska coasts. At coastal locations which have experienced strong ground shaking, local tsunamis are possible due to underwater landslides.

At 6:45 PM Pacific Standard Time on March 8, an earthquake with preliminary magnitude 7.2 occurred off the east coast of Honshu, Japan . (Refer to the United States Geological Survey for official earthquake parameters.)

Pacific coastal regions outside California, Oregon, Washington, British Columbia, and Alaska should refer to the Pacific Tsunami Warning Center messages for information on the event.

This will be the only statement issued for this event by the West Coast/Alaska Tsunami Warning Center unless conditions warrant. See the WCATWC web site for basic tsunami information, safety rules, and a tsunami travel time map and table. (NOTE: Travel time maps and tables indicate forecasted times only, not that a wave was generated.)

http://wcatwc.arh.noaa.gov/2011/03/09/lhrrnh/01/messagelhrrnh-01.htm

000
WEHW42 PHEB 090255
TIBHWX
HIZ001>003-005>009-012>014-016>021-023>026-090455-
TSUNAMI INFORMATION STATEMENT NUMBER   1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
455 PM HST TUE MAR 08 2011
TO - CIVIL DEFENSE IN THE STATE OF HAWAII
SUBJECT - TSUNAMI INFORMATION STATEMENT
THIS STATEMENT IS FOR INFORMATION ONLY. NO ACTION REQUIRED.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
   ORIGIN TIME - 0445 PM HST 08 MAR 2011
   COORDINATES - 38.3 NORTH  143.3 EAST
   LOCATION    - OFF EAST COAST OF HONSHU  JAPAN
   MAGNITUDE   - 7.2  MOMENT
EVALUATION
 BASED ON ALL AVAILABLE DATA A DESTRUCTIVE PACIFIC-WIDE TSUNAMI IS
 NOT EXPECTED AND THERE IS NO TSUNAMI THREAT TO HAWAII. REPEAT. A
 DESTRUCTIVE PACIFIC-WIDE TSUNAMI IS NOT EXPECTED AND THERE IS NO
 TSUNAMI THREAT TO HAWAII.
THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED.

http://www.weather.gov/ptwc/text.php?id=hawaii.2011.03.09.025534

Tsunami Warnings/Advisories

Tsunami Information Estimated Tsunami Arrival Time and Height High Tide Time and Estimated Tsunami Arrival Time at each place Tsunami Observations

Notes

To the text

Occurred at 11:45 JST 09 Mar 2011

Region name Sanriku Oki

Depth about 10km

Magnitude 7.2

Click the map to zoom in

Tsunami Forecast Region Classification of Tsunami Warning/Advisory

PACIFIC COAST OF AOMORI PREF. TSUNAMI ADVISORY

IWATE PREF. TSUNAMI ADVISORY

MIYAGI PREF. TSUNAMI ADVISORY

FUKUSHIMA PREF. TSUNAMI ADVISORY

Tsunami Warning/Advisory

Issued at 11:48 JST 09 Mar 2011

******************Headline******************

Tsunami Attension has been issued.

PACIFIC COAST OF TOHOKU

*******************Text********************

Tsunami Advisory

<Tsunami Advisory>

PACIFIC COAST OF AOMORI PREF.

IWATE PREF.

MIYAGI PREF.

FUKUSHIMA PREF.

***********About Tsunami Forecast************

<Tsunami Advisory>

Tsunami height is expected to be about 0.5 meters, Pay attention to tsunamis.

 http://www.jma.go.jp/en/tsunami/

Earthquake Swarm – Scotty’s Castle – California Nevada Border Region

Posted in Uncategorized with tags , , , , , , , , , , , , on September 30, 2010 by highboldtage

http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/US2/36.38.-118.-116_eqs.php

http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/US2/36.38.-118.-116.php

~ 60 quakes in the last 24 hours, nine of them 3+, one 4+ near  the northern region of Death Valley.

Scotty’s Castle:

http://en.wikipedia.org/wiki/Scotty%27s_Castle

Eureka Earthquakes Focus of “Mogi Doughnut Theory”

Posted in Uncategorized with tags , , , , , , on July 18, 2010 by highboldtage

As UC Davis physicist and geologist John Rundle ponders the map of recent California earthquakes, he sees visions of a doughnut even Homer J. Simpson wouldn’t like.

The doughnut is formed by pinpointing the recent quakes near Eureka, Mexicali and Palm Springs.

Seismologists call the possible pattern a Mogi doughnut.

http://mobile.latimes.com/inf/infomo?view=topstoriesitem&feed:a=latimes_1min&feed:c=topstories&feed:i=55012820

Earthquake Swarm in Humboldt County

Posted in Uncategorized with tags , , , , on July 12, 2010 by highboldtage

We seem to be  in a little swarm period right now, with four 3+ mag quakes in the last few days.  They seem to be increasing in magnitude.  Do you have your earthquake preparedness up to date?

Two of them were on the Mendocino fault, this mornings on the Russ Fault, all offshore, and the other day one on the Yager Fault a few miles inland.

Mother Earth is restless.

Earthquake Offshore Eureka Mag 3.5 July 12 2010

Posted in Uncategorized with tags , , , on July 12, 2010 by highboldtage

Earthquake Details

  • This event has been reviewed by a seismologist.
Magnitude 3.5
Date-Time
  • Monday, July 12, 2010 at 15:15:12 UTC
  • Monday, July 12, 2010 at 08:15:12 AM at epicenter
Location 40.706°N, 124.597°W
Depth 13.3 km (8.3 miles)
Region OFFSHORE NORTHERN CALIFORNIA
Distances
  • 31 km (20 miles) WNW (297°) from Ferndale, CA
  • 33 km (21 miles) W (265°) from Humboldt Hill, CA
  • 36 km (22 miles) W (259°) from Bayview, CA
  • 38 km (23 miles) WSW (256°) from Eureka, CA
  • 359 km (223 miles) NW (313°) from Sacramento, CA
Location Uncertainty horizontal +/- 1.8 km (1.1 miles); depth +/- 1.3 km (0.8 miles)
Parameters Nph= 41, Dmin=34 km, Rmss=0.36 sec, Gp=216°,
M-type=local magnitude (ML), Version=3
Source
Event ID nc71423790

http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/nc71423790.html