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地震 ›› 2018, Vol. 38 ›› Issue (4): 14-21.

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2008年和2014年两次于田MS7.3地震前区域重力变化特征

张国庆1,2, 祝意青1, 梁伟锋1, 郭树松1, 隗寿春1   

  1. 1.中国地震局第二监测中心, 陕西 西安 700054;
    2.武汉大学测绘学院, 湖北 武汉 430079
  • 收稿日期:2017-05-22 发布日期:2019-08-15
  • 作者简介:张国庆(1989-),男,山东菏泽人,博士,助理工程师,主要从事流动重力数据处理与分析。
  • 基金资助:
    国家自然科学基金(41274083、 41374026), 中国地震局震情跟踪青年课题(2017010203)

Spatial Patterns of Regional Gravity Changes before the 2008 and 2014 Yutian MS7.3 Earthquakes

ZHANG Guo-qing1,2, ZHU Yi-qing1, LIANG Wei-feng1, GUO Shu-song1, WEI Shou-chun1   

  1. 1.The second Monitoring and Application Center, CEA, Shaanxi Xi’an 700054, China;
    2.School of Geodesy and Geomatics, Wuhan University, Hubei Wuhan 430079, China
  • Received:2017-05-22 Published:2019-08-15

摘要: 利用中国地壳运动监测网络及中国大陆构造环境监测网络2002年、 2005年、 2010年、 2013年四期相对和绝对重力数据计算中国西部2002—2005年和2010—2013年重力变化, 分析2008年和2014年两次于田MS7.3地震的震前重力时空变化特征, 两次地震前均出现较大范围区域重力异常, 比较两次地震震中与震前重力变化空间分布特征, 发现两次地震震前区域重力场具有如下共同特征: ① 地震震中附近震前均出现较大局部重力异常; ② 震中均位于重力变化高梯度带附近; ③ 地震均发生在重力变化正负转换的零值线附近; ④ 基于流动重力异常变化在2008年和2014年于田两次MS7.3地震前均做过一定程度的中期预测, 尤其是地点预测。 最后, 结合青藏高原北缘地质构造背景讨论了地震孕育发生与构造活动的关系。

关键词: 重力异常, 于田地震, 地质构造, 青藏高原, 中期预测

Abstract: In this paper, gravity changes of 2002—2005 and 2010—2013 were calculated based on the ground gravity data in 2002, 2005, 2010 and 2013 from the Crustal Movement Observation Network of China (CMONOC). We analyzed the spatial patterns of the gravity changes between the 2008 Yutian MS7.3 earthquake and the 2014 and Yutian MS7.3 earthquake, and the results demonstrated that there were common characteristics before these two earthquakes: ① Regional gravity anomalies appeared near the epicenters before these two earthquakes; ② The earthquakes occurred at the high gravity changing belts; ③ The epicenters were located near the zero line of the gravity transferring from positive value to negative value; ④ The earthquakes were mid-term predicted, especially the epicenter location, based on the regional gravity anomalies. At last, we discussed the relationship between the earthquake preparation and the tectonic activities based on the geological background in the north margin of Tibetan Plateau.

Key words: Gravity anomalies, Yutian earthquakes, Geological structure, Tibetan Plateau, Mid-term earthquake prediction

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