Earthquake Report

Magnitude: 1.8
Mon September 17, 2012 10:26PM (PDT)
Event Id: 60453077
Version #4: This report supersedes any earlier report of this event
This event has been reviewed by a seismologist
Magnitude: 1.8 Ml
Time: Mon September 17, 2012 10:26PM (PDT)
Tue September 18, 2012 05:26 (UTC)
Distance From: 17.8 km ( 11.0 mi) NNE ( 34. azimuth) from Tacoma, WA
20.1 km ( 12.5 mi) WSW ( 257. azimuth) from Maple Valley, WA
25.9 km ( 16.1 mi) S ( 175. azimuth) from Seattle, WA
Coordinates: 47.37, -122.303
Depth: 26.93 Km (16.43 miles)
Location Quality: Excellent
Event Id: 60453077
Horizontal Uncertainty: 0.48 Km
Depth Uncertainty: 0.91 Km
Azimuthal Gap: 48.0 deg
Number of Phases: 45
RMS Misfit: 0.34

Historic Activity

Historic_map_icon

Focal Mechanism

More Information

Solution 1

Uw60453077.uwfm1
Number of P First Motions: 23
Plane A Plane B Uncertainty
Strike 110º 354º 23.0º
Dip 80º 22º 10.0º
Rake 70º 153º 40.0º

Discrepant Stations

Station Network Channel Polarity Quality
B941 PB EHZ D 0.98
PAYL UW ENZ D 0.92
GNW UW BHZ U 0.92
B013 PB EHZ D 0.92
B943 PB EHZ D 0.92
60453077

Station

Code, or name, to designate a particular seismic station