The Pacific Northwest Seismograph Network PNW EARTHQUAKE INFORMATION Strong Motion Information

Magnitude	Date	Latitude	Longitude	Depth
3.2	2001/02/28 07:16 UTC	47.7530	-120.0253	0.55

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)
TTW	BHE	125	0.0022	0.0006
TTW	BHN	125	0.0019	0.0004
TTW	BHZ	125	0.0014	0.0004
ELW	ELE	142	0.0025	0.0031
ELW	ELN	142	0.0021	0.0032
ELW	ELZ	142	0.0037	0.0030
ELW	HHE	142	0.0026	0.0008
ELW	HHN	142	0.0021	0.0006
ELW	HHZ	142	0.0039	0.0003
ALCT	ELE	152	0.0002	0.0004
ALCT	ELN	152	0.0002	0.0004
ALCT	ELZ	152	0.0003	0.0006
MPL	ELE	165	0.0015	0.0026
MPL	ELN	165	0.0018	0.0022
MPL	ELZ	165	0.0021	0.0023
SP2	ELE	169	0.0009	0.0025
SP2	ELN	169	0.0010	0.0024
SP2	ELZ	169	0.0008	0.0021
SP2	HHE	169	0.0009	0.0005
SP2	HHN	169	0.0008	0.0005
SP2	HHZ	169	0.0007	0.0004
PCEP	ELE	185	0.0005	0.0004
PCEP	ELN	185	0.0008	0.0005
PCEP	ELZ	185	0.0014	0.0005

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.

Back to
Main Page for this Earthquake.
PNSN Strong Motion Home Page.
Dept. of Earth and Space Sciences.