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地震 ›› 2012, Vol. 32 ›› Issue (2): 129-134.

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中国大陆GPS连续观测站测得的日本9.0级地震同震位移与震前变化

赵国强, 李鹏   

  1. 中国地震局地震预测研究所, 北京 100036
  • 收稿日期:2011-10-21 修回日期:2011-12-22 出版日期:2012-04-30 发布日期:2021-08-20
  • 作者简介:赵国强(1981-), 男, 内蒙古集宁人, 硕士学位, 主要从事GPS数据处理等研究。
  • 基金资助:
    中国地震局地震预测研究所基本科研业务专项(02092426)资助

Coseismic and Pre-seismic Displacements Observed by Fiducial Stations in China Caused by the 2011 Japan M9.0 Earthquake

ZHAO Guo-qiang, LI Peng   

  1. Institute of Earthquake Science, CEA, BeiJing 100036, China
  • Received:2011-10-21 Revised:2011-12-22 Online:2012-04-30 Published:2021-08-20

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摘要： 利用中国大陆GPS连续观测站资料, 获取了2011年3月11日日本9.0级地震造成的连续站同震位移。 计算结果表明, 位于我国东部尤其是东北地区的台站在水平方向都有明显的同震位移, 且离震中越近同震位移量越大, 其中绥阳站的水平同震位移量最大, 达到33 mm。 通过对时间序列分析发现, 有明显同震位移的连续站, 震前水平方向的运动速度都有放缓的趋势, 可能是一种形变前兆现象。 这些GPS观测到的同震位移及震前运动速度异常, 对于进一步研究前兆地壳运动、 地震动力学特征以及精化中国大陆地壳运动速度场都有重要意义。

关键词: 同震位移, GPS连续观测, 日本9.0级地震, 时间序列

Abstract: We calculated coseismic deformations at fiducial stations in China caused by the 2011 M9.0 Japan Earthquake. The results show that there are obvious coseismic displacements at stations located in the east, especially northeast of China, and the coseismic displacements are in directly proportional to the epicentral distance. The coseismic displacement at the SUIY station is the largest, 3.3 cm. A phenomenon is found in the time series that the speed of horizontal movements at the fiducial stations with obvious coseismic displacement decreased before the earthquake, and this phenomenon might be one of the earthquake precursors. Coseismic displacements and abnormal speed of movement before the earthquake collected by GPS data will be of profound significance for the study of predictive crustal movement, kinetic characteristics of earthquake and the crust velocity field in mainland China.

Key words: Coseismic displacement, CMONOC GPS, Japan M9.0 earthquake, Time series

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