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Fine Velocity Structure and Relocation of the 2010 M_L 5.1 Earthquake Sequence in the Rongchang Gas Field

Earthquake Research in China 2012年第4期26卷 467-478页

作者： Wang Xiaolong Ma Shengli Lei Xinglin Guo Xin Wang Qiang Yu Guozheng Gou Xianbin Kuwahara Yasuto Imanishi Kazutoshi Jiang Xiadong Earthquake Administration of Chongqing Municipality State Key Laboratory of Earthquake Dynamics Institute of Geology CEA Geological Survey of Japan Hohai University Changzhou

Based on data collected from a temporal seismic network, and in addition to the data from some nearby permanent stations, we investigate the velocity structure and seismicity in the Rongchang gas field, where significant injection-induced seismicity has been identified. First, we use receiver functions from distant earthquakes to invert detailed 1-D velocity structures beneath typical stations. Then, we use the double-difference hypocenter location method to re-locate earthquakes of the 2010 MLS. 1 earthquake sequence that occurred in the region. The re-located hypocenters show that the 2010 MLS. 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 5km with a dominant depth of -2km, a depth of major reservoirs and injection wells. We thus conclude that the 2010 ML 5. 1 earthquake sequence might have been induced by the deep well injection of unwanted water at a depth - 3km in the Rongchang gas field.

关键词： Induced earthquake Receiver function double difference location Rongchang

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Analysis of the Badong Ms5. 1 earthquake source characteristics

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Geodesy and Geodynamics 2014年第4期5卷 16-24页

作者： Wu Haibo Chen Junhua Shen Xuelin Zhang Lifen Zhao Lingyun Zhang Ke Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake Administration Earthquake Administration of Hubei Province Earthquake Administration of Shiyan City

The mainshock location of the Badong MsS. 1 earthquake is determined using four location methods ： the simplex method, HYP2000, hyposat, and locSAT; the 350 aftershocks over 3 months are relocated using the double difference location method. The results indicate that aftershocks are distributed as bands along the NEE direction and that the aftershocks 1 month after the mainshock, which are mainly distributed in the west of the mainshock and near the Gaoqiao fault, arc shallow earthquakes within 5 km; the depth of each after- shock after one month is deeper, and two distinct fault planes, for which the geological occurrence is similar to the Gaoqiao and Zhoujiashan-Niukou fault, are shaped. The frequency-spectrum analysis of the recorded wave- form in 12 seismic events indicates that the corner frequency of the mainshock is significantly lower than that of its aftershock and is also lower than a tectonic earthquake of the same magnitude. We considered that this result is related to the constraint of the parameter calibration relationship in the focal spectrum and the lithology change due to water erosion. Combined with the focal mechanism and geological tectonic setting, we conclude that the occurrence of the earthquake is related to the activity of the Daping and Gaoqiao fault and is a reser- voir-induced tectonic seismicity.

关键词： precise location of the mainshock double difference location deep profile corner frequency

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