Fine Velocity Structure and Relocation of the 2010 M_L5.1 Earthquake Sequence in Rongchang Gasfield

详细信息   

• 责任者：Wang Xiaolong (Chongqing Earthquake Administration ; Chongqing 401147 ; China) ; Ma Shengli
• 刊名：Seismology and Geology
• 出版年：2012
• 卷期：34(2)
• 关键词：诱发地震 ; induced earthquakes ; 强震 ; strong earthquakes ; 重庆 ; Chongqing
• 页码：p.348-358
• 图表：5 illus., 19 refs.
• 分类号：0500
• issnNo：ISSN0253-4967
• isbnNo：CN11-2192/P

摘要

Based on data collected from a temporary seismic network, in addition to some nearby permanent stations, the authors investigate velocity structure and seismicity in Rongchang gas field, where significant injection-induced seismicity has been identified. The relocated hypocenters show that the 2010 M_L 5.1 earthquake sequence was distributed in a small area surrounding major injection wells and clustered mostly along pre-existing faults. Major earthquakes show a focal depth less than 5 km with a dominant depth of ~2 km, a depth of major reservoirs and injection wells. The authors conclude that the 2010 M_L 5.1 earthquake sequence might be induced by deep well injection of unwanted water at a depth ~3 km in Rongchang gas field.