June 25, 2001 Spokane Earthquake and aftershocks

The 2001 Spokane Earthquake Sequence - Special Report

Basic Information

Time of Occurrence (GMT): Monday June 25, 2001 at 14:15:22.59 Z
Time of Occurrence (PDT): Monday June 25, 2001 at 07:15:22.59 AM
Time of Occurrence (PST): Monday June 25, 2001 at 06:15:22.59 AM

Depth (km) 9.79
Magnitude Mc=3.9, ML=3.7

Location 47.6662N 117.3605W

     3.4 km   E of Spokane, WA
   105.1 km   N of Pullman, WA
   105.9 km SSE of Colville, WA

Name of data file: 01062514151n

This is an automated web page produced after a significant earthquake to give essential information about the earthquake, its aftershocks, and previous earthquake activity in the region. Some of the information here will be updated as aftershocks occur.

Visit the WEBICORDERS to see near-real-time earthquake trace data - SPUD is the nearest station to Spokane.

SHAKING INTENSITIES

Community Internet Intensity Map: Human Reports of Experienced Shaking Intensity - By Zip Code
- DID YOU FEEL IT? Fill out a Earthquake Form
Shake Map: Instrumental Measurements of Shaking Intensity

Detailed Information and Graphics about the Earthquake

Our data base of earthquake hypocenters contains information from the 19th century to the present. Included are:

A map of the Pacific Northwest showing the location of the mainshock (in red) plus prior earthquakes M > 3.5. Shallow events are black. Events deeper than 35 km are green.
A map showing a closer view of the earthquake and prior historical earthquakes with magnitude 3.5 or greater. Shallow events are black. Events deeper than 35 km are green.
A list of 10 big earthquakes preceding the mainshock that are closest to it and have a magnitude greater than 4.0. These are the most significant historical earthquakes in the vicinity of the mainshock (see closer view map above).
A map showing the location of the mainshock relative to cities.
A map showing the location of the mainshock relative to the nearest seismograph stations that recorded it.
A general map of significant historical earthquake locations in the Pacific Northwest.
A list of recent earthquakes (M > 1.0) that occurred prior to the mainshock in the area shown on the next map
A map of recent earthquakes (M > 1.0) that occurred prior to the mainshock. Detailed area shown is just few kilometers around the mainshock.
A List of the nearest 20 strong motion sites

Foreshocks and Aftershocks

The following information will be updated as new aftershocks occur. Note that the locations of early epicenters are quite scattered because we had no seismographs near Spokane. Recent epicenters have been located using a new seismograph (SPUD) located in Spokane as well as more distant seismographs.

An Earthquake Catalog listing the location and magnitude of all earthquakes we have located in the epicentral region (including the mainshock and any aftershocks) for the current year.
Detailed Map of the earthquakes in this catalog for the epicentral region.
Seismic Activity as a function of time in the epicentral region since the time of the mainshock.

Earthquake Mechanism

If sufficient P-wave first motion data are available, a fault plane determination for the earthquake will be available in the form of

A diagram of the fault plane solution(s). In some cases more than one solution may fit the data.
A table describing the fault plane solution(s) summarizing the characteristics of possible fault planes ("A" and "B") that are consistent with the recorded first-motion data.

Moment Tensor Estimates of the Earthquake size may also be available. To see, check at Oregon State U.

Moment-Tensor Web site at Oregon State University

Preliminary Strong Motion Information

Strong-motion information from digital accelerographs.

Related Information: Most Up-to-Date Local, National, and Global Earthquake Summaries

Catalog and Map of Pacific Northwest earthquakes, Mag>2 from the PNSN
Catalog and Map of United States earthquakes, from the ANSS
Catalog and Map of world earthquakes, from the IRIS