Tag Archives: San Antonio

Another San Antonio, TX Earthquake

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Earth moves again for San Antonians

SAN ANTONIO EXPRESS-NEWS
Updated 06:16 p.m., Saturday, November 12, 2011

SAN ANTONIO – A magnitude 3.3 earthquake shook a rural area south of San Antonio early Saturday morning.

The quake, with its epicenter about 44 miles southeast of the city, struck at about 4:35 a.m., according to the U.S. Geological Survey.

No damage was reported.

A 4.8 magnitude quake that struck the area last month was the largest ever recorded since USGS began keeping track.

Experts say smaller earthquakes are not uncommon for the area.

Alan Dutton, chairman of the Department of Geological Sciences at the University of Texas at San Antonio, has told the Express-News that the region generally gets a tremor every two to four years, more or less.

The largest quake ever recorded in Texas history happened Aug. 16, 1931. It had a magnitude of 5.8, and its epicenter was near Valentine, in Jeff Davis County in far West Texas.

from:   http://www.chron.com/news/houston-texas/article/Earth-moves-again-for-San-Antonians-2266079.php

Texas Earthquake 10/20

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Moderate extremely shallow earthquake in Atascosa County, Texas, United States

Last update: October 20, 2011 at 8:06 pm by By 

Shaking map, Texas October 20 2011 earthquake – courtesy USGS

Update 18:07 UTC :  The region southeast of San Antonio has experienced earthquakes before. There was a 4.3 magnitude earthquake in 1993 near the same location, and there have been smaller quakes recorded back to the 1970s.

Update :  It looks that we are lucky that the epicenter is located in a rural area without many houses and buildings.

Update :  Intensity in relation to villages / cities:
Light shaking: Karnes City, Poth, Kenedy, Floresville, Pleasanton, Three Rivers
Weak shaking: Corpus Christi (277,000), San Antonio (1,257,000), New Braunfels    (46,000), Victoria (62,000) and San Marcos (47,000)

Update :  According to USGS, 77 people will have felt a MMI VII very strong shaking. Damages are not excluded at this intensity. 166 people a strong shaking and 3,000 people a moderate shaking.  639,000 a light shaking and finally 2,490,000 people a weak to very weak shaking.

Update :  We received I Have Felt It reports from Austin to Corpus Christi.

Update :  The uncertainty of the epicenter location is horizontally  +/- 19.3 km (12.0 miles) and vertically (depth) +/- 3.1 km (1.9 miles). In other words the epicenter can be located below another village than mentioned.

Other locations in the epicenter area : Kenedy, Falls City, Christine, Pleasanton and Jourdanton.
Preliminary data show that the earthquake has been felt as far as Austin, Texas

to read more, and for updates, go to:    http://earthquake-report.com/2011/10/20/moderate-extremely-shallow-earthquake-in-atascosa-county-texas-united-states/