河北及邻区地磁加卸载响应比映震分析
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摘要
应用地磁加卸载响应比方法,选取河北及邻区2008年1月至2016年10月FHD观测数据,研究地磁响应比异常与该区M 4.0以上地震的对应关系。结果表明:(1)近9年符合判据标准的地磁加卸载响应比异常有11组33次,其中7组异常有震例对应,在选定的14次震例中9次对应震前异常;(2)异常面积通常与最大异常强度成正比关系;(3)前兆异常时间与震级之间一般正相关;(4)组内各次异常位置多具有连续性和迁移性;(5)震中大部分出现在异常高值区。
By using the method of geomagnetic loading and unloading response ratio, the FHD observation data in Hebei and its adjacent areas from January 2008 to October 2016 are selected to study the corresponding relation between the response ratio anomaly and the earthquakes above M 4.0 in this area. The results show that:(1) In the last 9 years, there are 11 groups of anomalies that conform to the criteria of the criterion for 33 times, of which 7 exceptions have the corresponding earthquake cases, and 9 of the 14 earthquake cases correspond to the anomalies before the earthquake.(2) The abnormal area is usually proportional to the maximum anomalous intensity.(3) There is a positive correlation between precursory anomaly time and magnitude.(4) The abnormal locations in the group are more continuous and migratory.(5) Most of the epicenters appeared in the abnormal high value area.
By using the method of geomagnetic loading and unloading response ratio, the FHD observation data in Hebei and its adjacent areas from January 2008 to October 2016 are selected to study the corresponding relation between the response ratio anomaly and the earthquakes above M 4.0 in this area. The results show that:(1) In the last 9 years, there are 11 groups of anomalies that conform to the criteria of the criterion for 33 times, of which 7 exceptions have the corresponding earthquake cases, and 9 of the 14 earthquake cases correspond to the anomalies before the earthquake.(2) The abnormal area is usually proportional to the maximum anomalous intensity.(3) There is a positive correlation between precursory anomaly time and magnitude.(4) The abnormal locations in the group are more continuous and migratory.(5) Most of the epicenters appeared in the abnormal high value area.
引文
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Zhang Jianguo,Wu Xiaoping,Wu Xiaodong,Du Wei,Yue Mingxin.Observational evidence of anisotropic changes of apparent resistivity before strong earthquakes[J].Geophys J Int,2017,210(3):1 323-1 331.
贾立峰,张国苓,乔子云,等.华北地区地磁加卸载响应比方法应用研究[J].地震工程学报,2016,38(4):588-605.
宋治平,尹祥础,陈学忠,等.加卸载响应比的时空演变特征及其对地震三要素的预测意义[J].地震学报,1996,1(82):179-186.
李伟,龚耀,赵文舟,等.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[J].地震,2014,34(1):125-133.
尹祥础,张浪平,张晖辉,等.加卸载响应比20年及其展望[J].国际地震动态,2008,4:1-17.
尹祥础,尹灿.非线性系统的失稳前兆与地震预测[J].中国科学(B辑),1991,5:512-518.
张建国,焦立果,刘晓灿,等.汶川MS 8.0级地震前后ULF电磁辐射频谱特征研究[J].地球物理学报,2013,5(64):1 253-1 261.
张建国,姚丽等,刘晓灿,等.地震电离层VLF电磁场频谱特征研究[J].大地测量与地球动力学,2012,32(3):110-115.
曾小平,续春荣,赵明,等.地球磁场对太阳风的加卸载响应与地震[J].地震地磁观测与研究,1996,17(1):49-53.
朱燕,史勇军,巴克,等.新疆地区地磁加卸载响应比方法应用研究[J].中国地震,2002,18(4):409-416.
董博,纪春玲,张环曦,等.采用克里金插值法分析河北地区地磁场变化特征[J].地震地磁观测与研究,2016,37(3):147-154.
董博,纪春玲,张环曦,等.河北地区近年地磁场变化特征[J].华北地震科学,2017,35(4):22-28.
张建国,闰俊岗,王静.地磁加卸载响应比方法在地震预报中的应用[J].大地测量与地球动力学,2008,28(2):45-50.
Zhang Jianguo,Wu Xiaoping,Wu Xiaodong,Du Wei,Yue Mingxin.Observational evidence of anisotropic changes of apparent resistivity before strong earthquakes[J].Geophys J Int,2017,210(3):1 323-1 331.