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Magnitude 4.3 - Mount St. Helens area, Washington

Pathfinder

Pathfinder

Editor, Senior Moderator
Magnitude 4.3 - MOUNT ST. HELENS AREA, WASHINGTON

2011 February 14 18:35:25 UTC

Earthquake Details

  • This event has been reviewed by a seismologist.
<TABLE id=parameters summary="Earthquake Details"><TBODY><TR><TH>Magnitude</TH><TD>4.3</TD></TR><TR><TH>Date-Time</TH><TD>
</TD></TR><TR><TH>Location</TH><TD>46.279?N, 122.215?W</TD></TR><TR><TH>Depth</TH><TD>5 km (3.1 miles) set by location program</TD></TR><TR><TH>Region</TH><TD>MOUNT ST. HELENS AREA, WASHINGTON</TD></TR><TR><TH>Distances</TH><TD>
  • 9 km (6 miles) NNW (343?) from Mount St. Helens Volcano, WA
  • 31 km (20 miles) S (171?) from Morton, WA
  • 35 km (22 miles) SE (143?) from Mossyrock, WA
  • 59 km (37 miles) ENE (75?) from Longview, WA
  • 78 km (48 miles) NNE (23?) from Vancouver, WA
</TD></TR><TR><TH>Location Uncertainty</TH><TD>horizontal +/- 0.7 km (0.4 miles); depth fixed by location program</TD></TR><TR><TH>Parameters</TH><TD>NST= 61, Nph= 62, Dmin=4 km, Rmss=0.3 sec, Gp= 29?,
M-type=duration magnitude (Md), Version=1
</TD></TR><TR><TH>Source</TH><TD>
</TD></TR><TR><TH>Event ID</TH><TD>uw02141835

</TD></TR></TBODY></TABLE>


http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/uw02141835.php
 
Re: Magnitude 4.3 - Mount St. Helens area, Washington

4.3-magnitude earthquake near Mount St. Helens is biggest in 30 years

Published: Monday, February 14, 2011, 4:54 PM Updated: Monday, February 14, 2011, 6:04 PM

By Stuart Tomlinson, The Oregonian

Fault line, won't you be my Valentine?

The second largest earthquake since Mount St. Helens erupted -- a magnitude 4.3 shaker -- rocked a fault line six miles north of the volcano Monday morning. People felt it as far away as Astoria, Lake Oswego, Hood River and even Bremerton, Wash., near Seattle.

The last one, as it happens, was 30 years ago also on Valentine's Day, a magnitude 5.5 temblor.

More...

http://www.oregonlive.com/pacific-n..._mount_st_helens_was_biggest_in_30_years.html
 
Re: Magnitude 4.3 - Mount St. Helens area, Washington

Cascade Range Current Update

U.S. Geological Survey, Vancouver, Washington
University of Washington, Pacific Northwest Seismic Network, Seattle, Washington
U.S. Geological Survey, Northern California Seismic Network, Menlo Park, California


<CASCADE_UPDATE><CENTER></CENTER><CENTER>CASCADES VOLCANO OBSERVATORY INFORMATION STATEMENT
Monday, February 14, 2011 5:48 PM PST (Tuesday, February 15, 2011 0148 UTC)</CENTER>

Mount St. Helens Volcano
46?12' N 122?10'48" W, Summit Elevation 8363 ft (2549 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

The 40-month-long lava-dome eruption of Mount St. Helens that began in autumn 2004 ended in late January of 2008. Earthquakes, volcanic gas emissions, and ground deformation are all at pre-eruptive background levels. The alert level and aviation color code were reduced to NORMAL/GREEN on July 10, 2008, following five months with no sign of renewed activity.

Even with the end of lava dome growth, some hazards persist. The new lava dome remains hot in places and capable of producing small hot avalanches or minor explosions that could dust areas with ash up to tens of miles downwind. Rock fall from the crater walls can produce clouds of dust that rise above the crater rim, especially during dry, windy days, as has happened in the past. Also, heavy rainfall or rapid snowmelt can send small debris flows onto the Pumice Plain north of the crater.

Recent observations:

An M4.3 earthquake struck the Mount St. Helens region this morning, 14 February 2011, at 10:35 a.m. PST (18:35 UTC) and was felt widely through southwestern Washington and Northwestern Oregon (http://earthquake.usgs.gov/earthquakes/dyfi/events/uw/02141835/us/index.html). Its exact magnitude may change by a few tenths from this value as records are further analyzed. The earthquake was followed by several aftershocks up to M2.8 over the next few hours (http://www.pnsn.org/recenteqs/latest.htm), the three largest of which were also reported felt. All of the earthquakes are located in an area about 8 kilometers (5 miles) north of the crater of Mount St. Helens, near the Johnston Ridge Observatory, at a depth of about 4 to 6 kilometers (2.5 to 4 miles).

Today's earthquakes are in the same place as a small swarm that took place about two weeks earlier, on 29 January. These earthquakes are reminiscent of a swarm that took place about 30 years ago, when a swarm of small earthquakes began in August 1980, a few miles northwest of today's activity. The 1980-1981 sequence climaxed with an M5.5 earthquake on 14 February 1981. Analysis of the 1981 events suggested that they occurred along existing faults in the Mount St. Helens seismic zone, a northwest to southeast trending system of faults in which Mount St. Helens lies. The Mount St. Helens seismic zone exhibits strike-slip motion, with the southwestern rocks slipping horizontally northwest relative to the rocks northeast of the fault zone. The fault zone likely exerts control on the location of Mount St. Helens volcano. Studies following the 1980 eruption suggested that the magma removed during the May 1980 eruption and subsequent lava-dome building caused faults along the seismic zone to slip in response to the magma withdrawal. Similar interaction of volcanic activity and tectonic fault movement is possible in the case of today's earthquakes, but at present there appears to be no signs of unrest in the volcanic system.

The USGS and the Pacific Northwest Seismic Network at University of Washington continue to watch conditions at Mount St. Helens closely.

http://volcanoes.usgs.gov/cvo/current_updates.php
 
Re: Magnitude 4.3 - Mount St. Helens area, Washington

Map Centered at 46?N, 122?W

Skip to earthquake lists
45.47.-123.-121.gif


http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/US2/45.47.-123.-121.php

Earthquake List for Map Centered at 46?N, 122?W

Update time = Tue Feb 15 15:00:02 UTC 2011
Here are the earthquakes in the Map Centered at 46?N, 122?W area, most recent at the top.
(Some early events may be obscured by later ones.)
Click on the underlined portion of an earthquake record in the list below for more information.

<TABLE border=0 cellSpacing=1 cellPadding=1><TBODY><TR><TH></TH><TH align=middle>MAG </TH><TH align=middle>UTC DATE-TIME
y/m/d h:m:s

</TH><TH align=middle>LAT
deg

</TH><TH align=middle>LON
deg

</TH><TH align=middle>DEPTH
km

</TH><TH>LOCATION</TH></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>2.2 </TD><TD noWrap align=middle>2011/02/15 05:09:32</TD><TD noWrap align=right>46.279</TD><TD noWrap align=right>-122.218</TD><TD noWrap align=right>4.7</TD><TD>9 km ( 6 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>1.1 </TD><TD noWrap align=middle>2011/02/15 02:19:29</TD><TD noWrap align=right>46.279</TD><TD noWrap align=right>-122.212</TD><TD noWrap align=right>3.6</TD><TD>9 km ( 6 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>1.0 </TD><TD noWrap align=middle>2011/02/15 00:53:39</TD><TD noWrap align=right>46.280</TD><TD noWrap align=right>-122.214</TD><TD noWrap align=right>3.1</TD><TD>9 km ( 6 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>2.3 </TD><TD noWrap align=middle>2011/02/14 20:21:42</TD><TD noWrap align=right>46.278</TD><TD noWrap align=right>-122.216</TD><TD noWrap align=right>4.7</TD><TD>9 km ( 6 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>1.1 </TD><TD noWrap align=middle>2011/02/14 19:54:51</TD><TD noWrap align=right>46.274</TD><TD noWrap align=right>-122.215</TD><TD noWrap align=right>2.8</TD><TD>9 km ( 5 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>2.3 </TD><TD noWrap align=middle>2011/02/14 19:35:08</TD><TD noWrap align=right>46.285</TD><TD noWrap align=right>-122.216</TD><TD noWrap align=right>5.4</TD><TD>10 km ( 6 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>1.1 </TD><TD noWrap align=middle>2011/02/14 19:12:06</TD><TD noWrap align=right>46.276</TD><TD noWrap align=right>-122.211</TD><TD noWrap align=right>3.8</TD><TD>9 km ( 5 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>1.3 </TD><TD noWrap align=middle>2011/02/14 19:01:25</TD><TD noWrap align=right>46.279</TD><TD noWrap align=right>-122.212</TD><TD noWrap align=right>4.9</TD><TD>9 km ( 6 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>1.3 </TD><TD noWrap align=middle>2011/02/14 18:54:06</TD><TD noWrap align=right>46.285</TD><TD noWrap align=right>-122.213</TD><TD noWrap align=right>6.0</TD><TD>10 km ( 6 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>1.2 </TD><TD noWrap align=middle>2011/02/14 18:47:55</TD><TD noWrap align=right>46.279</TD><TD noWrap align=right>-122.208</TD><TD noWrap align=right>4.6</TD><TD>9 km ( 6 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>2.8 </TD><TD noWrap align=middle>2011/02/14 18:37:45</TD><TD noWrap align=right>46.280</TD><TD noWrap align=right>-122.209</TD><TD noWrap align=right>4.5</TD><TD>9 km ( 6 mi) NNW of Mount St. Helens Volcano, WA</TD></TR><TR><TD noWrap align=middle>MAP</TD><TD noWrap align=middle>4.3 </TD><TD noWrap align=middle>2011/02/14 18:35:25</TD><TD noWrap align=right>46.282</TD><TD noWrap align=right>-122.212</TD><TD noWrap align=right>5.5</TD><TD>9 km ( 6 mi) NNW of Mount St. Helens Volcano, WA</TD></TR></TBODY></TABLE>

http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/US2/45.47.-123.-121_eqs.php
 
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