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World » Magnitude 3.2 - COLORADO

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Magnitude 3.2 - COLORADO

2008 September 25 16:55:35 UTC

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Earthquake Details

Magnitude

3.2

Date-Time

Thursday, September 25, 2008 at 16:55:35 UTC

Thursday, September 25, 2008 at 10:55:35 AM at epicenter

Time of Earthquake in other Time Zones

Location

37.385°N, 104.895°W

Depth

5 km (3.1 miles) set by location program

Region

COLORADO

Distances

17 km (10 miles) SE (144°) from La Veta, CO

21 km (13 miles) W (265°) from Aguilar, CO

29 km (18 miles) SSW (200°) from Walsenburg, CO

101 km (63 miles) SSW (194°) from Pueblo, CO

260 km (162 miles) S (179°) from Denver,
CO

Location
Uncertainty

horizontal +/- 10.7 km (6.6 miles); depth fixed by location
program

Parameters

NST= 15, Nph= 15, Dmin=67 km, Rmss=1.33 sec, Gp=101°,
M-type=local
magnitude (ML), Version=Q

Source

USGS NEIC (WDCS-D)

Event
ID

us2008xjbp

This event has been reviewed by a seismologist.

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feel it? Report shaking and damage at your location. You can also
view a map displaying accumulated data from your report and others.

Earthquake Summary

Tectonic Summary

EARTHQUAKES IN THE STABLE CONTINENTAL REGION
Most of North America
east of the Rocky Mountains has infrequent earthquakes. Here and there
earthquakes are more numerous, for example in the New Madrid seismic zone
centered on southeastern Missouri, in the Charlevoix-Kamouraska seismic zone of
eastern Quebec, in New England, in the New York - Philadelphia - Wilmington
urban corridor, and elsewhere. However, most of the enormous region from the
Rockies to the Atlantic can go years without an earthquake large enough to be
felt, and several U.S. states have never reported a damaging earthquake. The
earthquakes that do occur strike anywhere at irregular intervals.

Earthquakes east of the Rocky Mountains, although less frequent than in the
West, are typically felt over a much broader region. East of the Rockies, an
earthquake can be felt over an area as much as ten times larger than a similar
magnitude earthquake on the west coast. A magnitude 4.0 eastern U.S. earthquake
typically can be felt at many places as far as 100 km (60 mi) from where it
occurred, and it infrequently causes damage near its source. A magnitude 5.5
eastern U.S. earthquake usually can be felt as far as 500 km (300 mi) from where
it occurred, and sometimes causes damage as far away as 40 km (25 mi).

FAULTS
Earthquakes everywhere occur on faults within bedrock,
usually miles deep. Most of the region's bedrock was formed as several
generations of mountains rose and were eroded down again over the last billion
or so years.

At well-studied plate boundaries like the San Andreas fault system in
California, often scientists can determine the name of the specific fault that
is responsible for an earthquake. In contrast, east of the Rocky Mountains this
is rarely the case. All parts of this vast region are far from the nearest plate
boundaries, which, for the U.S., are to the east in the center of the Atlantic
Ocean, to the south in the Caribbean Sea, and to the west in California and
offshore from Washington and Oregon. The region is laced with known faults but
numerous smaller or deeply buried faults remain undetected. Even most of the
known faults are poorly located at earthquake depths. Accordingly, few
earthquakes east of the Rockies can be linked to named faults. It is difficult
to determine if a known fault is still active and could slip and cause an
earthquake. In most areas east of the Rockies, the best guide to earthquake
hazards is the earthquakes themselves.

Earthquake
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feel it? Report shaking and damage at your location. You can also
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Scientific & Technical Information

Phase
Data

Theoretical
P-Wave Travel Times

Preliminary Earthquake Report

U.S. Geological
Survey, National Earthquake Information Center:
World Data Center for
Seismology, Denver

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Page Last Modified: September 25, 2008 22:15:18 UTC