|Map of 5.0 magnitude earthquake in Texas.|
The U.S. Geological Survey (USGS) has this earthquake listed as a 4.6 magnitude, out of the 6 stations which sent through information only only one of them measured this earthquake under a 4.6 magnitude. Station – WVOR – 12:29:30 – 4.3 Magnitude;Station – BINY – 12:29:42 – 5.3 Magnitude;Station – SJG – 12:31:02 – 5.3 Magnitude;Station – SDV – 12:31:14 – 5.3 Magnitude;Station – EGAK – 12:32:56 – 4.8 Magnitude; andStation – COLA – 12:33:17 – 5.5 Magnitude.
The European-Mediterranean Seismological Centre (EMSC) registers the tremor at a magnitude of 5.0.
|Seismicity of the region.|
A record-breaking earthquake shook Atascosa County Thursday morning, rattling windows and sending tremors that could be felt throughout Central and South Texas. The 4.6 quake is the largest quake the area has felt since April 9, 1993, when a 4.3 earthquake moved through the area, Amy Vaughn with the U.S. Geological Survey told local television station WOAI. The 1993 quake had been the largest recorded in history since earthquake magnitudes were first catalogued in 1973. Fewer than 10 smaller earthquakes have struck since then. But the quake's magnitude is still being analyzed and could change as experts examine it more closely, she said. The USGS reported on its site that the earthquake struck at 7:24 a.m. about 47 miles southeast of San Antonio. The epicenter was in the rural community of Campbellton in Atascosa County. The strongest tremors were felt just southeast of San Antonio, but people reported feeling the quake throughout Central and South Texas. Weaker tremors were reported as far south as Kingsville and as far north as Georgetown, according to USGS. No significant damage was reported on the agency's site. A resident at the Cadillac Lofts in downtown San Antonio said the apartment complex felt like it was swaying during the tremor.“It was a little scary,” Matthew Egan wrote in an e-mail. “I'm from California, but at least back home everything was built on earthquake rollers. Makes me nervous to think how ill prepared San Antonio might be for a bigger quake.” Employees were briefly evacuated from the seven-story federal building located at the intersection of Cesar E. Chavez Boulevard and Indianola Street as a result of the earthquake. They were allowed to return inside just before 9 a.m., according to Chief Deputy U.S. Marshal Fernie Karl. There was no visible damage to the building, which houses offices for the U.S. Marshals Service, the Bureau of Prisons and the Social Security Administration. The evacuation was precautionary, and no injuries were reported. A teacher and a parent in Northside Independent School District's Powell Elementary School on the city's Northwest Side reportedly felt the classroom they were in shake and watched a water bottle fall off a desk. District maintenance workers checked the 49-year-old school building for damage but found none, according to a news release from the district. Similarly, the cafeteria staff at Judson Independent School District's Metzger Middle School on the city's East Side reported feeling the quake this morning, said a district spokeswoman in an email. - Chron.Meanwhile, further north and near-east of Texas, more earthquakes have been recorded in the Sooner State of Oklahoma:
There have been more earthquakes in Oklahoma, but not quite strong enough to be felt in Tulsa. The closest was centered in Prague, about 45 miles east of Oklahoma City, according to the U.S. Geological Survey. The other was near Midwest City. Both occurred about 1 a.m. Tuesday and both were magnitude 2.9. Last week KRMG reported on the one-year anniversary of one of the state's larger earthquakes, a magnitude 4.7 in Norman. Austin Holland, with the Oklahoma Geological Survey, told me Tuesday that that quake was part of a significant increase in the number of quakes in the past year or so. He says the quakes have been large enough to be felt, but not to cause significant, or even minor damage. "Something significant here in the mid-continent will be above 5.5 or so and you start getting damage at a magnitude 5, but we're talking minor," he said. Holland says the central part of Oklahoma has always been a hotbed for small-scale seismic activity. "Over the past two years it's been especially active, but not alarmingly so. We've had more than ten times as many earthquakes but they've all been magnitude 3 or less." One exception was the Norman quake. The U.S. Geological Survey confirms 18 quakes in the area in the past six months on their website. - KRMG.The following map shows the active and developing seismic areas across the North American Plate, the tectonic plate covering most of North America, Greenland, and the North Pacific Region, extending eastward to the Mid-Atlantic Ridge and westward to the Chersky Range in eastern Siberia.