USGS National-Strong Motion Program
Preliminary Corrected Peak Ground Acceleration and Velocity and Pseudo-Spectral Acceleration Values for
April 30, 2008, Willow Creek, California Earthquake (posted 05/01/2008)
Mw 5.4, 04/30/2008, 03:03 UTC, 04/29/2008, 08:03 PM PDT, 40.837 N, 123.499 W, 28.5 km depth, Regional Network ID# nc40216664
Sta	Inst	Inst	State: City; Recorder Location	Owner	Lat	Lon	Dist	Az	Ch	Sensor	Orient	PGA	PGV	PSA at:
Code	type	S/N			deg	deg	km	deg	No	type	deg	cm/s/s	cm/s	0.3 s	1.0 s	3.0 s
1580	Etna	2023	CA:Arcata;Humboldt State Univ	USGS	40.8741	-124.0764	48.9	275	1	EpiSen	90	8.7	0.454	0.87	0.489	0.0866
									2	EpiSen	360	8.8	-0.463	1.00	0.297	0.0559
									3	EpiSen	UP	-2.7	0.311	0.52	0.285	0.0637
1581	Etna	2021	CA:Eureka;South Bay School	USGS	40.7350	-124.2076	60.9	260	1	EpiSen	90	7.8	-0.509	1.46	0.914	0.0820
									2	EpiSen	360	8.7	-0.570	1.46	0.592	0.1020
									3	EpiSen	UP	2.2	-0.269	0.86	0.283	0.1130