Earthquake Report

Magnitude: 0.4
Mon August 20, 2012 09:12:57 PM (PDT)
Event Id: 60442397
Version #5: This report supersedes any earlier report of this event
This event has been reviewed by a seismologist
Magnitude: 0.4 Md
Time: Mon August 20, 2012 09:12:57 PM (PDT)
Tue August 21, 2012 04:12:57 (UTC)
Distance From: 26.5 km ( 16.4 mi) S ( 173. azimuth) from Morton, WA
58.5 km ( 36.3 mi) ENE ( 69. azimuth) from Longview, WA
60.7 km ( 37.7 mi) S ( 178. azimuth) from Eatonville, WA
Coordinates: 46.322, -122.231
Depth: 8.11 Km (4.95 miles)
Location Quality: Excellent
Event Id: 60442397
Horizontal Uncertainty: 0.34 Km
Depth Uncertainty: 0.5 Km
Azimuthal Gap: 88.0 deg
Number of Phases: 24
RMS Misfit: 0.12

Historic Activity

Focal Mechanism

More Information

Solution 1

Number of P First Motions: 12
Plane A Plane B Uncertainty
Strike 70º 332º 28.0º
Dip 35º 84º 45.0º
Rake 10º 125º 25.0º

Discrepant Stations


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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