Intensity and Impact of Magnitude 5.3 COLORADO Earthquake, 2011 August 23

According to the U.S. Geological Survey, a magnitude 5.3 quake hit at 11:46 p.m. MDT Monday about nine miles southwest of Trinidad, or 180 miles south of Denver. The quake was felt in a relatively large area of southern Colorado and northern New Mexico. A 4.6 quake was felt in the same area at 5:30 p.m., and a magnitude 3.0 quake was recorded about 9 p.m. During I published this post seven aftershocks were recorded so far.

A few homes were damaged and there were rockslides on Colorado Highway 12 and Interstate 25, but both highways remained open, Monday's earthquake damaged chimneys, cracked walls and knocked items off shelves, but there were no injuries. It  shaked everything but had no power loss.

Seismic details are as follows:
Location : 37.137°N, 104.671°W
Depth : 4.9 km (3.0 miles)

Region : COLORADO 

Distances: 5 km (3 miles) W (259°) from Cokedale, CO

13 km (8 miles) W (279°) from Starkville, CO

15 km (9 miles) WSW (255°) from Trinidad, CO
Magnitude 5.3  COLORADO Earthquake, 2011 August 23
126 km (78 miles) S (182°) from Pueblo, CO
289 km (180 miles) S (175°) from Denver, CO
Subduction Zones-Purple, Ridges-Red and Transform Faults Green
Location Uncertainty : horizontal +/- 12.9 km (8.0 miles); depth +/- 2.9 km (1.8 miles)

Parameters :
NST=314, Nph=315, Dmin=23.4 km, Rmss=1.34 sec, Gp= 14°,
M-type=regional moment magnitude (Mw), Version=8


Cities Exposed to Quake :


MMI
City
Population
IV
Trinidad
9000
IV
Raton
7000
III
Canon City
16000
III
Alamosa
9000
III
Taos
5000
III
Walsenburg
4000
II
Pueblo
104000
II
Santa Fe
69000
II
Pueblo West
26000
II
Las Vegas
14000
II
Los Alamos
12000

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