欢迎访问《地震》,

地震 ›› 2007, Vol. 27 ›› Issue (1): 39-46.

• • 上一篇    下一篇

文安地震与首都圈地区数字化应变资料分析

张晶, 江在森, 方颖, 王武星   

  1. 中国地震局地震预测研究所, 北京 100036
  • 收稿日期:2006-08-28 修回日期:2006-10-08 出版日期:2007-01-31 发布日期:2021-10-29
  • 作者简介:张晶(1963-), 女, 北京市人, 副研究员, 主要从事形变及地震中长期预报等研究。
  • 基金资助:
    “首都圈短临跟踪判定”专项(120602-0119)、 “北京及邻区近期地震危险性强化研究”项目联合资助。

Analysis on digital strain observation before Wen′an earthquake in Capital Circle Area

ZHANG Jing, JIANG Zai-sen, FANG ying, WAND Wu-xing   

  1. Institute of Earthquake Science, CEA, Beijing 100036, China
  • Received:2006-08-28 Revised:2006-10-08 Online:2007-01-31 Published:2021-10-29

摘要: 2005年以来首都圈地区易县、 延庆数字化线应变观测显示出现较大幅度的压缩性趋势变化, 其中延庆台伸缩仪NS向观测在2006年6、 7月份出现转折变化; 易县台应变组合观测计算的平面应变参数在2006年7月4日文安5.1级地震前1~2天出现转折变化; 经分析认为, 2005年以来首都圈西部区域应变开始加速, 2005年8月31日蔚县4.0级地震发生在加速变化过程中, 而文安地震发生在附近应变场的转折过程中, 可能预示着文安地震后首都圈地区进入了下一个应变积累变化过程。

关键词: :应变变化, 数字化观测, 文安地震, 首都圈

Abstract: The line-strain observation at Yixian and Yanqing stations shows that large change of compression has appeared in the Capital Circle Area since 2005. The strain in NS turned back at Yanqing station in June and July, 2006. The parameters of plane strain are calculated using extensometer data in 3 directions at Yixian station. The result shows the parameters of plane strain changed in reverse 1~2 days before the MS5.1 Wen′an earthquake (July 4th 2006) from. The strain has been accelerated in the western part of the Capital Circle Area since 2005 based on analysis, when Yuxian 4.0 earthquake (Aug. 31, 2005) occurred, Wen'an earthquake occurred in course of plane strain turning back. It may indicate that plane strain enters a stage for strain accumulation after Wen'an earthquake in Capital Circle Area.

Key words: Strain change, Digital observation, Wen′an earthquake, Capital Circle Area

中图分类号: