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地震 ›› 2014, Vol. 34 ›› Issue (1): 125-133.

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地磁加卸载响应比方法在上海及其邻区地震研究中的应用

李伟, 龚耀, 赵文舟, 陈军   

  1. 上海市地震局, 上海 200062
  • 发布日期:2020-07-20
  • 作者简介:李伟(1979-), 男, 云南昆明人, 助理研究员, 主要从事地震电磁学、地震预报等研究。
  • 基金资助:
    地震科技星火计划(XH12016)及上海市科委科研计划项目(批准号:12231202700)共同资助

Application of Geomagnetic LURR Method in Seismic Studies in Shanghai and its Adjacent Areas

LI Wei, GONG Yao, ZHAO Wen-zhou, CHEN Jun   

  1. Earthquake Administration of Shanghai Municipality, Shanghai 200062, China
  • Published:2020-07-20

摘要: 本文运用2000—2010年上海佘山台和崇明台地磁场Z分量所计算得到的地磁加卸载响应比资料分析了近11年地磁加卸载响应比对上海及其邻区中小地震的预测分析效果,并对原有的预测指标体系进行了完善。分析结果表明: ① 地磁加卸载响应比值在大于3.4的异常情况下,对上海及其邻区的ML≥4.0地震预测有一定的指示意义; ② 两个台站的地磁加卸载响应比值随时间的整体变化趋势与上海及其邻区地震活动性的变化有较好的对应关系; ③ 通过小波变换得到,地磁加卸载响应比值与该地区的地震活动性时间序列都存在4.5年的周期变化,且在该周期尺度上位相变化一致性较好。

关键词: 地磁加卸载响应比, 地震活动性, 小波变换, 上海及邻区

Abstract: Based on the vertical component Z of geomagnetic field observed respectively at the stations of Sheshan and Chongming for 11 years from 2000 to 2010, we calculated the values of the geomagnetic Load-Unload Response Ratio (LURR) and analyzed the seismic activity in Shanghai and its adjacent areas in the same period of time. We discussed the usage of the value to predicting the earthquake and revised the original index system. The results show that: ① When the value of the LURR is greater than 3. 4, there is a important implication for predicting ML≥4. 0 earthquake in Shanghai and its adjacent areas; ② The overall trend of the values of the LURR is consistent with the variation characteristics of the seismic activity in this area; ③ the result of the wavelet transform indicates there is the same period about 4. 5 year between the value of LURR and the seismic activity, and the phase variations are consistent in this period scale.

Key words: Geomagnetic LURR method, Seismic activity, Wavelet transform, Shanghai and its Adjacent Areas

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