The Pacific Northwest Seismograph Network PNW EARTHQUAKE INFORMATION Strong Motion Information

Magnitude	Date	Latitude	Longitude	Depth
2.5	2001/02/20 06:22 UTC	47.7853	-122.3277	24.41

Contents

Maps

Shake Map Instrumental Intensity, peak accelerations, peak velocities.

Strong Motion Parameters

Strong Motion Parameters for each component of each station

STA	COMP	Dist (km)	PGA (%g)	PGV (cm/sec)
BRKS	ELE	4	0.0016	0.0005
BRKS	ELN	4	0.0016	0.0005
BRKS	ELZ	4	0.0017	0.0004
CSEN	ELE	8	0.0006	0.0005
CSEN	ELN	8	0.0004	0.0005
CSEN	ELZ	8	0.0015	0.0004
FINN	ELE	10	0.0009	0.0005
FINN	ELN	10	0.0018	0.0006
FINN	ELZ	10	0.0025	0.0004
NOWS	ELE	12	0.0145	0.0159
NOWS	ELN	12	0.0155	0.0165
NOWS	ELZ	12	0.0174	0.0170
LAWT	ELE	15	0.0012	0.0004
LAWT	ELN	15	0.0022	0.0008
LAWT	ELZ	15	0.0013	0.0004
LEOT	ELE	16	0.0012	0.0006
LEOT	ELN	16	0.0021	0.0007
LEOT	ELZ	16	0.0015	0.0006
QAW	ELE	17	0.0140	0.0185
QAW	ELN	17	0.0198	0.0102
QAW	ELZ	17	0.0181	0.0134
EARN	ELE	22	0.0021	0.0006
EARN	ELN	22	0.0025	0.0006
EARN	ELZ	22	0.0008	0.0005
KIMB	ELE	23	0.0007	0.0004
KIMB	ELN	23	0.0007	0.0003
KIMB	ELZ	23	0.0009	0.0004
KINR	ELE	24	0.0023	0.0006
KINR	ELN	24	0.0010	0.0003
KINR	ELZ	24	0.0009	0.0005
SP2	ELE	26	0.0148	0.0044
SP2	ELN	26	0.0142	0.0043
SP2	ELZ	26	0.0071	0.0026
SP2	HHE	26	0.0142	0.0037
SP2	HHN	26	0.0135	0.0037
SP2	HHZ	26	0.0084	0.0021
ALCT	ELE	27	0.0011	0.0004
ALCT	ELN	27	0.0011	0.0004
ALCT	ELZ	27	0.0016	0.0005
PNLK	ELE	32	0.0008	0.0004
PNLK	ELN	32	0.0008	0.0004
PNLK	ELZ	32	0.0008	0.0005
MPL	ELE	37	0.0030	0.0021
MPL	ELN	37	0.0031	0.0023
MPL	ELZ	37	0.0113	0.0025
RBEN	ELE	40	0.0005	0.0005
RBEN	ELN	40	0.0006	0.0004
RBEN	ELZ	40	0.0009	0.0005
KIMR	ELE	46	0.0007	0.0004
KIMR	ELN	46	0.0009	0.0004
KIMR	ELZ	46	0.0006	0.0004
ELW	ELE	47	0.0126	0.0033
ELW	ELN	47	0.0111	0.0030
ELW	ELZ	47	0.0085	0.0036
ELW	HHE	47	0.0127	0.0020
ELW	HHN	47	0.0113	0.0023
ELW	HHZ	47	0.0083	0.0010
TTW	BHE	49	0.0073	0.0011
TTW	BHN	49	0.0091	0.0012
TTW	BHZ	49	0.0047	0.0008
SQM	BHE	63	0.0009	0.0003
SQM	BHN	63	0.0008	0.0003
SQM	BHZ	63	0.0023	0.0004
PCEP	ELE	75	0.0003	0.0004
PCEP	ELN	75	0.0003	0.0004
PCEP	ELZ	75	0.0007	0.0006
ERW	ELE	78	0.0028	0.0029
ERW	ELN	78	0.0025	0.0025
ERW	ELZ	78	0.0013	0.0023
ERW	HHE	78	0.0033	0.0002
ERW	HHN	78	0.0030	0.0003
ERW	HHZ	78	0.0020	0.0002
PCMD	ELE	100	0.0010	0.0003
PCMD	ELN	100	0.0006	0.0003
PCMD	ELZ	100	0.0005	0.0003
RWW	BHE	129	0.0003	0.0004
RWW	BHN	129	0.0003	0.0004
RWW	BHZ	129	0.0002	0.0003
LTY	BHE	138	0.0007	0.0001
LTY	BHN	138	0.0007	0.0001
LTY	BHZ	138	0.0003	0.0000

Parameter Definitions

• STA - The 3 or 4 letter station designation.
• COMP - Component flag. Each station has a tri-axial accelerometer for measuring motions in the vertical (Z), north-south (N) , and east-west (E) directions. The "EL" part of the component indicates that the data are from an accelerometer with a high sample rate (here 100 samples per second). A "BH" or "HH" indicates that the data are from a broadband velocity sensor. (The "HH" components usually have a 100 sps sample rate and the "BH" components are usually 40 or 50 sps).
• Dist - Surface distance from the earthquake epicenter to the recording station.
• PGA - Peak ground acceleration. The peak value from a single component (no vector sums). Values are expressed in percent g (acceleration due to gravity, 32 ft/sec/sec or 9.81 m/sec/sec).
• PGV - Peak ground velocity; determined by integrating the acceleration time-series using the trapezoidal rule.

Station Information

List showing station coordinates and sensor information.
Station Maps

The information presented in this document is preliminary. It will be modified after additional analysis of the accelerograms.

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