SPECIAL EARTHQUAKE

Special Event

Basic Information

Time of Occurrence (GMT): Friday September 28, 2001 at 18:34:53.83 Z
Time of Occurrence (PDT): Friday September 28, 2001 at 11:34:53.83 AM
Time of Occurrence (PST): Friday September 28, 2001 at 10:34:53.83 AM

Depth (km) 0.52
Magnitude (Mc) 2.8

Location 47.6840N 117.3923W

     1.7 km  NE of Spokane, WA
   103.1 km SSE of Colville, WA
   107.4 km   N of Pullman, WA

Name of data file: 01092818345n

This is an automated web page produced after a significant earthquake to give essential information about the earthquake and previous earthquake activity in the region. This information will be updated as needed.

Vist the WEBICORDERS to see near-real-time earthquake trace data

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 earthquake (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 3.5. These are the most significant historical earthquakes in the vicinity of the mainshock (see the closer view map above).
A map showing the location of the earthquake relative to cities.
A map showing the location of the earthquake relative to the nearest seismograph stations that recorded it.
A detailed list of all earthquakes (M > 1.0) that occurred in the vicinity of the special earthquake in the previous two years. For the locations of these events see the next map.
A map of all earthquakes (M > 1.0) that occurred in the two years prior to the special earthquake. Detailed area shown is just few kilometers around the mainshock.
A List of the nearest 20 strong motion sites

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