应用VAN法、波形分析法、潮汐谐波分析等对华北地区观测资料质量较好的地电场台进行研究,结果表明,华北地区地电场波形日变幅度范围为2.35—11.12 mV/km;VAN法在华北地区有一定的震例对应,如2003年5月22日河北唐山ML 4.1、2006年7月4日河北文安ML 5.1、2010年3月6日河北滦县ML 4.7等地震前河北昌黎地震台都曾记录到地电场异常信号,存在震前地电场SES的场地效应;华北地区岩体裂隙优势方位α角一致性较差,波动范围约为20°。
Geoelectric field stations with high quality of observation data in North China are analyzed by applying VAN method, conventional waveform analysis method and tidal harmonic analysis method. The results show that the range of the peak of geoelectric field waveform in North China is 2.35-11.12 mV/km, and by applying VAN method, there exist certain earthquake cases in North China, such as Tangshan ML 4.1 earthquake on May 22, 2003, Wenan ML 5.1 earthquake on July 4, 2006 and Luanxian ML 4.7 earthquake on March 6, 2010. Abnormal geoelectric field waveforms are recorded before these three earthquakes, and the site effect of the SES exists. Meanwhile, the primary azimuths of the rock mass fissures are poorly consistent, and the fluctuation range is about 20°.
2022,43(1): 76-85 收稿日期:2021-01-28
DOI:10.3969/j.issn.1003-3246.2022.01.011
基金项目:河北省地震科技星火计划项目——红山野外站科研专项任务“河北省地电场方位角变化特征分析研究”(项目编号:DZ2021110800002)
作者简介:张波(1983—),男,工程师,主要从事地电观测与研究工作。E-mail:279652635@163.com
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