So far, none of the two dozen earthquakes recorded in North Texas since the start of November have caused any serious damage. The Eagle Mountain Lake Dam is fine. Homes and businesses are intact, save for the occasional hairline crack. No one has been hurt.
A USGS map showing the 17 earthquakes that measured 2.5 on the Richter scale and above in the past 30 days.
There's no guarantee that won't change as the quakes, centered near the Parker County town of Azle, creep toward 4.0 on the Richter scale, the magnitude at which seismic activity can start causing damage. The most recent quake, which happened just after midnight on Sunday, registered a 3.6. At 3:23 a.m. Monday, a 3.7 shook Mineral Wells.
The earthquakes aren't directly related to hydraulic fracturing, the process of releasing oil and natural gas from rock formations by blasting them with a pressurized liquid. But they probably are caused by injecting the resulting wastewater -- nine billion gallons per month in Texas -- deep underground.More »