期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
卷 119, 期 1, 页码 581-593出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013JB010755
关键词
induced earthquakes; seismic hazard
资金
- USGS, Department of the Interior [G12AP20001, G13AP00023]
- Research Partnership to Secure Energy for America (RPSEA) [11122-27]
- U.S. Department of Energy's National Energy Technology Laboratory
This study summarizes our investigation of the 17 May 2012 M(W-RMT)4.8 earthquake near Timpson, Texas, the largest earthquake recorded historically in eastern Texas. To identify preshocks and aftershocks of the 17 May event we examined the arrivals recorded at Nacogdoches (NATX) 30 km from the 17 May epicenter, at nearby USArray Transportable Array stations, and at eight temporary stations deployed between 26 May 2012 and mid-2013. At NATX we identified seven preshocks, the earliest occurring in April 2008. Reliably located aftershocks recorded by the temporary stations lie along a 6 km long NW-SE linear trend corresponding to a previously mapped basement fault that extends across the highest-intensity (MMI VII) region of the 17 May main shock. Earthquakes in this sequence are relatively shallow-with focal depths ranging from 1.6 to 4.6 km. Evidence supporting these depths include: hypocentral locations of exceptionally well-recorded aftershocks, S-P intervals at the nearest stations, and comparisons of synthetics and observed seismograms. Within 3 km of the linear trend of aftershock activity there are two Class II injection disposal wells injecting at 1.9 km depth beginning in August 2006 and February 2007, with injection rates averaging 42,750m(3)/mo and 15,600m(3)/mo, respectively. Several observations support the hypothesis that fluid injection triggered the Timpson sequence: well-located epicenters are situated near a mapped basement fault and near high-volume injection wells, focal depths are at or below the depths of injection, and the earliest preshock (April 2008) occurred after the onset of injection in 2006.
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