Earthquakes 3.6, 2.3 M - North California coast, Petrolia, CA

Tsunami Message: At 11:02 AM Pacific Daylight Time on April 3, an earthquake with preliminary magnitude 3.6 occurred 55 miles/89 Km southwest of Eureka, California.

The magnitude is such that a tsunami WILL NOT be generated. This will be the only WCATWC message issued for this event.

3.6 M - Earthquake Details

Magnitude	3.6
Date-Time	Friday, April 03, 2009 at 18:02:22 UTC Friday, April 03, 2009 at 11:02:22 AM at epicenter Time of Earthquake in other Time Zones
Location	40.514°N, 124.749°W
Depth	15 km (9.3 miles)
Region	OFFSHORE NORTHERN CALIFORNIA
Distances	42 km (26 miles) W (260°) from Ferndale, CA 45 km (28 miles) WNW (298°) from Petrolia, CA 52 km (32 miles) W (261°) from Fortuna, CA 58 km (36 miles) WSW (238°) from Eureka, CA 356 km (221 miles) NW (309°) from Sacramento, CA
Location Uncertainty	horizontal +/- 0.9 km (0.6 miles); depth +/- 1.4 km (0.9 miles)
Parameters	NST=113, Nph=113, Dmin=48 km, Rmss=0.15 sec, Gp=234°, M-type=local magnitude (ML), Version=2
Source	California Integrated Seismic Net: USGS Caltech CGS UCB UCSD UNR
Event ID	nc40234234

2.3 M - Earthquake Details

Magnitude	2.3
Date-Time	Friday, April 03, 2009 at 18:05:39 UTC Friday, April 03, 2009 at 11:05:39 AM at epicenter Time of Earthquake in other Time Zones
Location	40.528°N, 124.887°W
Depth	0.8 km (~0.5 mile) (poorly constrained)
Region	OFFSHORE NORTHERN CALIFORNIA
Distances	53 km (33 miles) W (264°) from Ferndale, CA 56 km (35 miles) WNW (294°) from Petrolia, CA 62 km (38 miles) WSW (249°) from Humboldt Hill, CA 68 km (42 miles) WSW (245°) from Eureka, CA 366 km (228 miles) NW (308°) from Sacramento, CA
Location Uncertainty	horizontal +/- 6.3 km (3.9 miles); depth +/- 11.2 km (7.0 miles)
Parameters	NST= 30, Nph= 30, Dmin=58 km, Rmss=0.27 sec, Gp=277°, M-type=duration magnitude (Md), Version=1
Source	California Integrated Seismic Net: USGS Caltech CGS UCB UCSD UNR
Event ID	nc40234235