Earthquake Report

Magnitude: 0.5
Tue September 4, 2012 02:23AM (PDT)
Event Id: 60461086
Version #4: This report supersedes any earlier report of this event
This event has been reviewed by a seismologist
Magnitude: 0.5 Md
Time: Tue September 4, 2012 02:23AM (PDT)
Tue September 4, 2012 09:23 (UTC)
Distance From: 32.9 km ( 20.4 mi) SSW ( 198. azimuth) from Morton, WA
44.0 km ( 27.3 mi) ENE ( 69. azimuth) from Longview, WA
64.6 km ( 40.1 mi) SE ( 139. azimuth) from Centralia, WA
Coordinates: 46.277, -122.408
Depth: 17.57 Km (10.72 miles)
Location Quality: Excellent
Event Id: 60461086
Horizontal Uncertainty: 0.58 Km
Depth Uncertainty: 0.67 Km
Azimuthal Gap: 163.0 deg
Number of Phases: 24
RMS Misfit: 0.19

Historic Activity

Historic_map_icon

Focal Mechanism

More Information

Solution 1

Uw60461086.uwfm1
Number of P First Motions: 15
Plane A Plane B Uncertainty
Strike 170º 278º 25.0º
Dip 25º 82º 15.0º
Rake 160º 66º 20.0º

Discrepant Stations

Station Network Channel Polarity Quality
STD CC BHZ U 0.98
SHW UW EHZ U 0.92

Solution 2

Uw60461086.uwfm2
Number of P First Motions: 15
Plane A Plane B Uncertainty
Strike 265º 144º 30.0º
Dip 70º 36º 15.0º
Rake 60º 144º 25.0º

Discrepant Stations

Station Network Channel Polarity Quality
STD UW EHZ D 0.98
SHW UW EHZ U 0.92
SOS UW EHZ U 0.92
60461086

Map boundaries

 The red polygon is the reporting region for  this map; the black polygon is the authoritative region of the PNSN. Events inside the authoritative network are rendered as cirlces; events outside the authoritative region but inside the reporting region are rendered as squares. Explosions are always rendered as stars.  More

Cross Section

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