USGS National-Strong Motion Program
Preliminary Corrected Peak Ground Acceleration and Velocity and Pseudo-Spectral Acceleration Values for
December 05, 2004, Willow Creek, CA Earthquake (posted 12/10/2004)
Mw 4.3, 12/05/2004, 01:48 UTC, 12/04/2004, 05:48 PM PST, 40.740 N, 123.802 W, 18.9 km depth, Regional Network ID# nc40169129
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	40.874	-124.075	27.4	303	1	EpiSen	90	13.2	-0.43	3.14	0.207	0.0196
									2	EpiSen	360	-9.9	-0.34	1.69	0.076	0.0076
									3	EpiSen	UP	4.0	0.12	0.36	0.049	0.0037
1581	Etna	2021	CA: Eureka; South Bay School	USGS	40.735	-124.207	34.2	269	1	EpiSen	270	15.6	0.63	3.31	0.226	0.0242
									2	EpiSen	180	26.7	-0.96	3.85	0.224	0.0243
									3	EpiSen	UP	-5.6	0.19	1.53	0.091	0.0126