2013年芦山MS7.0地震前地电场变化特征研究

地震 ›› 2015, Vol. 35 ›› Issue (1): 91-99.

2013年芦山M_S7.0地震前地电场变化特征研究

安张辉^1,2,3, 杜学彬^1,2,3, 范莹莹^1,2,3, 刘君^1,2,3, 谭大诚^1,2,3, 崔腾发^1,2,3, 陈军营^1,2,3, 王建军^1,2,3

1.中国地震局地震预测研究所兰州科技创新基地, 兰州 730000;
2.兰州地球物理国家野外科学观测研究站, 兰州 730000;
3.中国地震局兰州地震研究所, 兰州 730000

收稿日期:2014-05-29 出版日期:2015-01-31 发布日期:2020-06-22
作者简介:安张辉(1978-), 男, 山西运城人, 副研究员, 主要从事地震电磁学研究和全国地电台网技术管理工作。
基金资助:
中国地震局地震预测研究所基本科研业务专项(2012IESLZ04)和国家自然科学基金(41374080和41174059)共同资助

Characteristics of Geo-electric Field Changes before the 2013 Lushan M_S7.0 Earthquake

AN Zhang-hui^1,2,3, DU Xue-bin^1,2,3, FAN Ying-ying^1,2,3, LIU Jun^1,2,3, TAN Da-cheng^1,2,3, CUI Teng-fa^1,2,3, CHEN Jun-ying^1,2,3, WANG Jian-jun^1,2,3

1. Lanzhou Base of Institute of Earthquake Sciecne, CEA, Lanzhou 730000, China;
2. State Geophysics Observatory in Lanzhou, CEA, Lanzhou 730000, China;
3. Lanzhou Institute of Seismology, CEA, Lanzhou 730000, China

Received:2014-05-29 Online:2015-01-31 Published:2020-06-22

摘要/Abstract

摘要： 利用希尔伯特-黄变换方法对2013年芦山M_S7.0地震前甘肃省平凉台、四川省成都台和云南省元谋台地电场观测资料进了分析研究。为增强对研究结果的说服力, 还对平凉、成都和元谋地电场观测台站在正常时段变化情况, 与地震发生前夕的处理结果进行了对比, 对成都地电场观测台站在芦山M_S7.0和汶川M_S8.0地震前的变化情况也进行了对比分析, 并得出: ① 希尔伯特-黄变换方法能够对地电场观测资料进行有效处理, 处理结果简单直观; ② 在芦山地震前1~2个月地电场时频图出现能量增强现象, 出现变化的周期范围约为90~1400 h, 能量最小变化幅度有3个数量级, 最大变化幅度达到6个数量级; ③ 通过上述三个地电场观测结果的对比, 以及成都地电场观测结果的类比方式, 大大提高了分析研究结果的可信度。在讨论部分, 对地电场观测中能够观测到震前异常变化的可能性, 从实验和数值模拟两个方面进行了相关论述。

关键词: 希尔伯特-黄变换, 芦山M_S7.0地震, 地电场, 时频谱

Abstract: In this paper, HilbertHuang Transformation method is introduced to deal with geoelectric field data observed by the stations around the epicenter of 2013 Lushan M_S7.0 earthquake. These stations include the stations of Gansu Pingliang, Sichuan Chengdu and Yunnan Yuanmou. We compare the results of the three geoelectric field stations between the normal time with the eve of the Lushan M_S7.0 earthquake, the results of Chengdu geoelectric field station about the Lushan Ms7.0 and Wenchuan Ms8.0 earthquakes are also analyzed. We conclude that: (1) HHT method is effective for the data analysis observed by the geoelectric field station, the timefrequency spectrum may be simple and intuitive; (2)About 1~2 months before the Lushan M_S7.0 earthquake, the energy of geoelectric field enhanced, with period range of approximately 90~1400 hours, the minimum amplitude of energy variation is about 3 orders of magnitude, the largest ranges up to about 6 orders; (3) The credibility of results obtained are greatly enhanced through comparison obtained from the three geoelectric field stations, and analogy obtained from the Chengdu geoelectric field station. In the discussion section of results, we discussed the?situation of seismic electromagnetic signals based on the experimental and numerical simulation method in the domestic and abroad in recent years, these results obtained by them can provide theoretical support to our results in this paper.

Key words: Time-frequency spectrum, Hilbert-Huang Transform, Lushan M_S7.0 earthquake, Geo-electric field

中图分类号:

P315.7

安张辉, 杜学彬, 范莹莹, 刘君, 谭大诚, 崔腾发, 陈军营, 王建军. 2013年芦山M_S7.0地震前地电场变化特征研究[J]. 地震, 2015, 35(1): 91-99.

AN Zhang-hui, DU Xue-bin, FAN Ying-ying, LIU Jun, TAN Da-cheng, CUI Teng-fa, CHEN Jun-ying, WANG Jian-jun. Characteristics of Geo-electric Field Changes before the 2013 Lushan M_S7.0 Earthquake[J]. EARTHQUAKE, 2015, 35(1): 91-99.

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