USGS National-Strong Motion Program
Preliminary Corrected Peak Ground Acceleration and Velocity and Pseudo-Spectral Acceleration Values for
September 28, 2004, Parkfield, CA Earthquake (posted 09/28/2004; updated 07/20/2005)
Mw 6.0, 09/28/2004, 17:15 UTC, 09/28/2004, 10:15 AM PDT, 35.815 N, 120.374 W, 7.9 km depth, Regional Network ID# nc51147892
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
GFU	GEOS	7	CA: Parkfield; Gold Hill	USGS	35.8331	-120.3464	3.2	51	1	GEOS	UP	-116	-2.1	7.1	1.8	0.57
									2	GEOS	360	136	-5.7	13.8	3.0	1.04
									3	GEOS	90	-168	6.0	15.0	3.7	0.57
EFU	GEOS	17	CA: Parkfield; Eades	USGS	35.8942	-120.4212	9.8	334	1	GEOS	UP	-192	7.4	18.5	9.7	0.99
									2	GEOS	360	-384	-25.8	46.1	39.8	3.22
									3	GEOS	90	312	-26.7	37.5	37.3	4.21
PHOB	RF130	9266	CA: Hog Canyon	NCSN	35.8666	-120.4796	11.1	301	1	RF130	360	251	-19.5	38.6	18.0	2.77
									2	RF130	90	269	-22.6	57.8	33.6	3.64
									3	RF130	UP	171	-9.2	38.6	8.0	1.00
UPSAR01	RT72-04	13	CA: Parkfield; UPSAR 01	USGS	35.8212	-120.5072	11.6	275	1	FBA-2g	UP	88	5.5	18.9	6.1	0.52
									2	FBA-2g	360	-134	10.5	38.1	16.7	1.33
									3	FBA-2g	90	180	-15.3	72.8	16.7	1.67
UPSAR02	RT72-04	14	CA: Parkfield; UPSAR 02	USGS	35.8221	-120.5064	11.6	275	1	FBA-2g	UP	-86	3.7	13.9	7.3	0.52
									2	FBA-2g	360	-170	-15.8	32.4	17.0	1.42
									3	FBA-2g	90	300	-18.0	69.9	14.8	1.69
UPSAR03	RT72-04	15	CA: Parkfield; UPSAR 03	USGS	35.8214	-120.5052	11.6	275	1	FBA-2g	UP	105	-4.5	20.7	9.1	0.54
									2	FBA-2g	360	-145	10.4	36.3	13.7	1.39
									3	FBA-2g	90	248	-17.3	42.2	10.5	1.36
UPSAR04	RT72-04		CA: Parkfield; UPSAR 04	USGS			11.6	275		never installed
UPSAR05	RT72-04	17	CA: Parkfield; UPSAR 05	USGS	35.8238	-120.5033	11.6	275	1	FBA-2g	UP	-181	-6.2	28.1	9.5	0.56
									2	FBA-2g	360	-235	17.3	49.0	16.1	1.66
									3	FBA-2g	90	-360	-22.9	73.8	24.1	1.46
UPSAR06	RT72-04	18	CA: Parkfield; UPSAR 06	USGS	35.8239	-120.5031	11.6	275	1	FBA-2g	UP	110	-5.2	20.7	8.9	0.54
									2	FBA-2g	360	-222	-13.2	66.9	16.3	1.58
									3	FBA-2g	90	241	-17.0	96.0	20.0	1.61
UPSAR07	RT72-04	19	CA: Parkfield; UPSAR 07	USGS	35.8238	-120.5028	11.6	275	1	FBA-2g	UP	187	5.9	34.3	8.5	0.54
									2	FBA-2g	360	368	-16.8	56.8	19.1	1.60
									3	FBA-2g	90	-319	18.5	70.8	21.5	1.66
UPSAR08	RT72-04	20	CA: Parkfield; UPSAR 08	USGS	35.8248	-120.5011	11.6	275	1	FBA-2g	UP	-132	-5.3	34.2	5.8	0.61
									2	FBA-2g	360	-181	-14.0	35.7	21.0	1.64
									3	FBA-2g	90	252	-15.9	59.6	14.4	1.57
UPSAR09	RT72-04	21	CA: Parkfield; UPSAR 09	USGS	35.8260	-120.5007	11.6	275	1	FBA-2g	UP	133	-8.9	37.0	6.3	0.62
									2	FBA-2g	360	-200	17.5	30.9	28.6	2.01
									3	FBA-2g	90	275	-22.2	62.0	26.9	1.91
UPSAR10	RT72-04	22	CA: Parkfield; UPSAR 10 *	USGS	35.8276	-120.5002	11.6	275	1	FBA-2g	UP	-171	6.6	28.8	7.0	0.63
									2	FBA-2g	360	271	-20.6	44.3	24.8	1.67
									3	FBA-2g	90	-305	-23.8	49.2	26.1	1.54
UPSAR11	RT72-04	47	CA: Parkfield; UPSAR 11	USGS	35.8258	-120.5020	11.6	275	1	FBA-2g	UP	233	-9.1	53.0	6.2	0.53
									2	FBA-2g	360	350	-20.0	73.6	21.4	1.77
									3	FBA-2g	90	-456	-27.2	102.0	25.2	1.59
UPSAR12	RT72-04	50	CA: Parkfield; UPSAR 12	USGS	35.8269	-120.5039	11.6	275	1	FBA-2g	UP	112	-8.1	28.0	6.9	0.53
									2	FBA-2g	360	-241	19.9	58.5	17.5	1.80
									3	FBA-2g	90	221	-16.0	70.2	16.8	1.70
UPSAR13	RT72-04	49	CA: Parkfield; UPSAR 13	USGS	35.8274	-120.5045	11.6	275	1	FBA-2g	UP	161	-8.0	22.5	9.1	0.51
									2	FBA-2g	360	-226	17.4	49.4	25.9	1.93
									3	FBA-2g	90	-289	-19.3	59.4	19.5	1.90
UPSAR14	RT72-04		CA: Parkfield; UPSAR 14	USGS	35.8271	-120.5053	11.6	275		offline due to electrical problems
WFU	GEOS	12	CA: Parkfield; Work Ranch	USGS	35.8145	-120.5111	12.4	270	1	GEOS	UP	167	4.4	12.4	3.6	0.33
									2	GEOS	360	183	5.6	14.8	5.3	0.81
									3	GEOS	90	335	9.9	23.4	3.9	0.83
DFU	GEOS	77	CA: Parkfield; Donna Lee	USGS	35.9392	-120.4245	14.5	342	4	GEOS	UP	171	9.0	20.3	4.4	0.83
									5	GEOS	360	366	-13.9	42.3	10.2	1.54
									6	GEOS	90	289	-15.1	31.4	12.7	2.35
FFU	GEOS	34	CA: Parkfield; Froelich	USGS	35.9111	-120.4855	14.7	317	4	GEOS	UP	-215	-6.6	14.1	10.5	1.09
									5	GEOS	360	373	-11.1	23.5	15.4	2.59
									6	GEOS	90	448	-17.5	54.2	9.8	1.76
JFU	GEOS	8	CA: Parkfield; Joaquin Canyon	USGS	35.9397	-120.4319	14.8	339	1	GEOS	UP	-301	9.6	55.9	4.9	0.68
									2	GEOS	21	-609	25.5	122.0	18.3	1.90
									3	GEOS	111	487	-30.3	73.9	21.3	3.72
VFU	GEOS	63	CA: Parkfield; Vineyard Canyon	USGS	35.9225	-120.5342	18.8	310	4	GEOS	UP	145	6.3	23.4	8.8	1.51
									5	GEOS	360	256	22.4	71.6	17.7	3.57
									6	GEOS	90	184	-16.9	40.7	30.6	2.63
KFU	GEOS	54	CA: Parkfield; Jack Canyon	USGS	35.7125	-120.2025	19.2	126	1	GEOS	UP	-159	4.4	9.9	2.5	0.38
									2	GEOS	360	-167	10.7	23.4	7.4	0.73
									3	GEOS	90	-144	-6.1	18.7	7.2	0.51
MFU	GEOS	6	CA: Parkfield; Middle Mountain	USGS	35.9576	-120.4956	19.3	325	1	GEOS	UP	-108	8.4	33.6	7.3	1.60
									2	GEOS	360	-402	29.4	108.0	16.1	6.19
									3	GEOS	90	181	-26.0	50.5	22.4	6.90
RFU	GEOS	52	CA: Parkfield; Red Hills	USGS	35.6244	-120.2535	23.8	153	4	GEOS	UP	53	1.7	5.2	2.9	0.23
									5	GEOS	360	-47	-3.1	9.3	3.8	0.27
									6	GEOS	90	-45	1.8	6.0	1.6	0.11
SFU	GEOS	99	CA: Parkfield; Stockdale Mtn	USGS	35.9730	-120.5786	25.5	314	1	GEOS	180	bad sensor
									2	GEOS	180	-229	6.8	26.6	3.8	0.60
									3	GEOS	270	-347	8.1	27.3	4.4	0.79
1747	Etna	1406	CA: Coalinga; Fire Station 39	USGS	36.137	-120.363	35.7	2	1	FBA-2g	360	-44	5.9	11.3	8.5	2.30
									2	FBA-2g	UP	-27	-3.9	6.7	5.3	1.04
									3	FBA-2g	90	-78	6.0	13.0	10.6	2.51
1083	Etna	1429	CA: San Luis Obispo; Rec Center	USGS	35.285	-120.661	64.3	204	1	FBA-2g	360	-10	0.9	3.6	1.2	0.08
									2	FBA-2g	UP	5	0.4	1.6	0.6	0.06
									3	FBA-2g	90	-13	1.2	2.3	1.4	0.15
1748	K2	722	CA: Fresno; NSMP USGS office	USGS	36.744	-119.728	118.3	29	1	FBA-2g	360	-3	0.3	1.0	0.3	0.22
									2	FBA-2g	UP	-5	0.2	1.4	0.2	0.03
									3	FBA-2g	90	-5	-0.4	1.4	0.7	0.29
1840	Etna	4022	CA: Fresno; VA Medical Center	USGS	36.773	-119.781	118.9	26	1	EpiSen	90	7	-0.5	1.3	0.7	0.19
									2	EpiSen	360	-5	0.4	1.3	0.5	0.15
									3	EpiSen	UP	-4	-0.2	1.0	0.2	0.05
1575	Etna	1404	CA: Hollister; City Hall Annex	USGS	36.851	-121.402	147.4	322	1	FBA-2g	360	-11	3.2	1.8	3.7	1.98
									2	FBA-2g	UP	-6	-1.7	0.9	1.8	0.98
									3	FBA-2g	90	14	3.2	2.5	5.7	1.79
1797	K2	1854	CA:Hollister; Airport building	USGS	36.891	-121.404	151.0	323	1	EpiSen	90	-9	3.4	1.4	1.9	2.26
									2	EpiSen	360	-10	2.8	1.6	2.2	2.20
									3	EpiSen	UP	5	1.5	0.7	1.1	0.66
* UPSAR10 PGA is suspect due to high-amplitude, high frequency (~40Hz) unknown noise at 6.85 s after P-onset near time of record peak amplitude