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SPOKANE, WASHINGTON

M4.0 (PNSN)

01/11/11
16:00:29
47.688N
117.400W
4.6 km (2.9 miles)

M4.0 Earthquake Shakes Spokane, Washington

Seismo-Watch More Special Earthquake Reports

November 11, 2001

SPOKANE, WASHINGTON - An earthquake measuring ML 4.0 (PNSN) was recorded at 8 a.m. this Sunday morning in Eastern Washington in downtown Spokane. People were frightened and some light objects toppled from tables and shelves, but no serious damage or injuries have occurred.

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According to the Pacific Northwest Seismic Network (PNSN) the earthquake occurred at 8:00 a.m., PST (16:00 UTC) on Sunday, November 11, about a mile north of Spokane (See a Topozone topo map, see a MapQuest street map).

Preliminary data places the epicenter between E. Bridgeport and E. Liberty Avenues just east N. Standard Street.

The focal depth was shallow and placed at 4.6 km (2.9 miles) beneath the surface, probably why it was so widely felt.

The quake was widely felt in Spokane, jarring some people from sleep and rattling others who on their way to church. Many were startled, some were frightened, others were exhilarated. Some noted a loud explosion-like sound just prior to the shaking. Did you feel this earthquake?

At least four aftershocks have been recorded thus far, two of which measured in the M3 range:

    M3.1 9:21 a.m., Nov. 11
    M3.3 7:03 p.m., Nov. 11
    M1.9 7:07 p.m., Nov. 11
    M2.4 7:11 p.m., Nov. 11

Another quake measuring M3.1 was detected at 7:03 p.m. some 17 miles NNE of Spokane but this has not been confirmed as of yet.

A total of 58 earthquakes have been recorded near Spokane this year and all but one followed a pair measuring M3.9 and M3.3 on June 25. (See list of events) See an epicentral map prepared by PNSN.

Today's temblor was the largest in the series thus far. See earlier report with more background info.

The earthquakes were located parallel but slightly east of the Latah Lineament, a northwest trending feature that extends from the Tekoa Mountains in the south and to a bit past Nine mile Falls in the north. It seems to capture Latah (Hangman) Creek and the Spokane River and forms the bluff of the west side of town. Some have referred to the lineament as a fault, and it probably is, but the tectonic fabric of the region is poorly understood and further work will be need to ascertain its relationships.

A good article about the Spokane earthquake swarm and the Latah Fault appears in Washington Geology, Vol. 29, No. 1/2, September 2001. Download a PDF copy of the issue here.


More information will be provided as soon as possible and this page will automatically refresh every 6 minutes to give you the latest news.

Additional Seismic information links:

Seismograms of the earthquake series from nearby stations:
Mainstream media news reports:
Report update: 7:32:04 PM, Monday, November 12, 2001
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