Seismo-Watch Significant Earthquake Report - No. 01-032
Regional Location:

Preliminary Magnitude:

Greenwich Mean Date:
Greenwich Mean Time:
Focal Depth:


ML 4.5 (NEIC)

10:52:08 (4:52 p.m. local time)
5.0 km (fixed)

TRINIDAD, COLORADO, SEPTEMBER 5, 2001 (Seismo-Watch) -- More earthquakes occurred in southern Colorado near the small community of Trinidad. The largest recent temblor measured ML 4.5 (NEIC) occurred at 10:52:08 UTC (04:52 a.m. local time), September 5, about 180 miles south of Denver and some 10 miles east of Trinidad near Cokedale.

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The quake was centered on the northern side of Picketwire Valley, at Cokedale, close to where a M4.0 temblor (see report) occurred about 23 hours earlier. (See a TopoZone location map or a MapQuest location map). The focal depth was fixed at 5.0 km beneath the surface for quick processing of the data and we do not have a fault plane solution for this event as of yet.

Foreshocks and aftershocks
Two quakes registering
M4.0 and M3.4 were recorded in the vicinity yesterday (See Seismo-Watch Special Report) and one aftershock in the M3 range has been recorded to today's event, a M3.7 at 7:49 a.m. local time.

According to the USGS catalog for earthquakes in the United States, this is the most activity ever recorded along the Colorado-New Mexico border during any given sequence. See a list of southern Colorado earthquakes near Trinidad. Unfortunately, Colorado does not maintain a detailed seismic network in the state and the current resolution of microseismic activity is probably at the M3 level. NEIC is considering deploying a system of three or four portable seismographs to the regional to look for these smaller events. No schedule has been posted as of yet.

Continued on Page 2.

Report update: 7:58:22 AM, Thursday, September 6, 2001
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