The Pacific Northwest Seismograph Network PNW EARTHQUAKE INFORMATION Strong Motion Information

Magnitude	Date	Latitude	Longitude	Depth
3.8	2001/04/07 16:02 UTC	48.4833	-124.0110	4.53

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)
ERW	ELE	103	0.0093	0.0049
ERW	ELN	103	0.0082	0.0047
ERW	ELZ	103	0.0062	0.0043
ERW	HHE	103	0.0089	0.0036
ERW	HHN	103	0.0085	0.0040
ERW	HHZ	103	0.0064	0.0028
SBES	ELE	122	0.0052	0.0048
SBES	ELN	122	0.0054	0.0048
SBES	ELZ	122	0.0030	0.0047
GNW	BHE	135	0.0018	0.0009
GNW	BHN	135	0.0014	0.0009
GNW	BHZ	135	0.0014	0.0007
GNW	SLE	135	0.0022	0.0010
GNW	SLN	135	0.0015	0.0008
SEA	ELE	157	0.0218	0.0303
SEA	ELN	157	0.0168	0.0365
SEA	ELZ	157	0.0089	0.0195
FINN	ELE	158	0.0047	0.0041
FINN	ELN	158	0.0054	0.0061
FINN	ELZ	158	0.0036	0.0051
SP2	ELE	167	0.0042	0.0039
SP2	ELN	167	0.0043	0.0038
SP2	ELZ	167	0.0033	0.0034
SP2	HHE	167	0.0044	0.0030
SP2	HHN	167	0.0039	0.0021
SP2	HHZ	167	0.0030	0.0020
EARN	ELE	169	0.0057	0.0059
EARN	ELN	169	0.0047	0.0057
EARN	ELZ	169	0.0037	0.0065
RWW	BHE	173	0.0023	0.0010
RWW	BHN	173	0.0024	0.0012
RWW	BHZ	173	0.0011	0.0004
RWW	SLE	173	0.0021	0.0010
RWW	SLN	173	0.0024	0.0012
RWW	SLZ	173	0.0010	0.0005
ELW	ELE	194	0.0040	0.0041
ELW	ELN	194	0.0032	0.0037
ELW	ELZ	194	0.0042	0.0034
ELW	HHE	194	0.0040	0.0012
ELW	HHN	194	0.0031	0.0014
ELW	HHZ	194	0.0039	0.0008
TTW	BHE	194	0.0084	0.0040
TTW	BHN	194	0.0089	0.0037
TTW	BHZ	194	0.0058	0.0018
TTW	SLE	194	0.0083	0.0041
TTW	SLN	194	0.0089	0.0034
TTW	SLZ	194	0.0056	0.0019
LON	BHE	254	0.0008	0.0003
LON	BHN	254	0.0004	0.0001
LON	BHZ	254	0.0003	0.0002
LON	SLE	254	0.0008	0.0004
LON	SLN	254	0.0006	0.0003
LON	SLZ	254	0.0005	0.0003

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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