期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 1, 页码 152-161出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL071808
关键词
induced seismicity; earthquakes; magnetics; gravity; Oklahoma; intraplate seismicity
资金
- USGS Earthquake Hazards Program, Central and Eastern U.S. Earthquake Hazards Task
- DoE grant from the Research Partnership to Secure Energy for America program [12122-91]
Recent Oklahoma seismicity shows a regional correlation with increased wastewater injection activity, but local variations suggest that some areas are more likely to exhibit induced seismicity than others. We combine geophysical and drill hole data to map subsurface geologic features in the crystalline basement, where most earthquakes are occurring, and examine probable contributing factors. We find that most earthquakes are located where the crystalline basement is likely composed of fractured intrusive or metamorphic rock. Areas with extrusive rock or thick (>4km) sedimentary cover exhibit little seismicity, even in high injection rate areas, similar to deep sedimentary basins in Michigan and western North Dakota. These differences in seismicity may be due to variations in permeability structure: within intrusive rocks, fluids can become narrowly focused in fractures and faults, causing an increase in local pore fluid pressure, whereas more distributed pore space in sedimentary and extrusive rocks may relax pore fluid pressure.
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