Notable PNW Earthquakes

Magnitude	4.1
Time	Saturday September 21, 2002 at 00:55:21.00 (UTC) Friday September 20, 2002 at 05:55:21.00 (PDT)
Distance from	10.6 km WSW of Friday Harbor, WA 17.6 km ENE of Victoria, BC 71.9 km S of Vancouver,BC
Coordinates	48.486 deg N 123.127 deg W
Depth	23 km
Quality	fair (CA)
Note: 1 km = 0.621 mile or 1 mile = 1.61 km

Name of Event File: 02092100552p

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.

SHAKE MAP list for PNSN - For certain earthquakes a map of shaking intensity based on measurements from strong-motion seismographs will be available.

DID YOU FEEL IT index search for PNSN - You can report shaking and damage at your location. You can also view a map displaying a summary of data received from all reports.

View Seismograms - View web-based seismograms by station and date.

Maps and History of Earthquakes in this Region

A map of the Pacific Northwest showing the location of the mainshock (in red) plus prior earthquakes M > 3.0. 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 3.0 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 detailed list of all earthquakes (M > 1.0) that occurred in the two years prior to the mainshock in the area shown on the next map.
A map of all earthquakes (M > 1.0) that occurred in the two years 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. Included are:

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.

Focal Mechanism - A diagram and table of the P-wave fault plane solution. If sufficient P-wave first motion data are available, a fault plane determination for the earthquake will be available.

Strong-Motion Information - Data from digital accelerographs.

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

Latest Quakes from the Pacific Northwest, the nation and the world

Earthquake Report

Magnitude 4.1, WSW of Friday Harbor, WA Friday September 20, 2002 at 05:55:21.00 (PDT)

Magnitude 4.1, WSW of Friday Harbor, WA
Friday September 20, 2002 at 05:55:21.00 (PDT)