地震综合信息量S值在岫岩M_S5.4级地震前异常特征研究
|
摘要
本文以地震前兆异常信息量综合数学表达式为基础,结合平滑滤波、消周期及趋势项和从属函数等数据处理方法,对1999年11月29日岫岩5.4级地震前的11个有异常显示的前兆台项和7个无异常显示的前兆台项进行地震综合信息量S值的计算与提取。结果表明,岫岩地震前有异常显示的前兆台项S值计算结果异常显示更清晰突出,个别震前无异常显示的台项S值计算结果也有不同程度的异常显示;综合时序曲线在岫岩地震前约19个月(1998年5月开始)出现高值异常(S值≥0.18),在岫岩地震前一年(1999年初)达到最高值;S值的空间扫描图像也在震中附近出现高值异常集中区,岫岩5.4级地震震前3个月的图像尤为明显。
Based on the synthetic math expression of earthquake precursory anomaly information variable in this paper,we acquired the S-values according to the information with precursory anomaly provided by 11 seismic stations and non-precursory anomaly by 7 seismic stations before Xiuyan 5.4 earthquake on November 29,1999, using some data processing methods,including the smooth filter,canceled cycle,trend item and membership functions.The result shows that S-value curves which show precursory anomaly before the earthquake will present more obvious anomaly and some curves which not show precursory anomaly will present anomaly in some degree.S-value curves for the period of 19 months prior to Xiuyan earthquake will present high value anomalies(S≥0.18) and present peak value in January 1999.The spatial scanning of S-value also shows that anomaly peaks focus on the around of seismic epicenter,the image for the period of 3 months prior to Xiuyan 5.4 earthquake is more obvious anomaly.
Based on the synthetic math expression of earthquake precursory anomaly information variable in this paper,we acquired the S-values according to the information with precursory anomaly provided by 11 seismic stations and non-precursory anomaly by 7 seismic stations before Xiuyan 5.4 earthquake on November 29,1999, using some data processing methods,including the smooth filter,canceled cycle,trend item and membership functions.The result shows that S-value curves which show precursory anomaly before the earthquake will present more obvious anomaly and some curves which not show precursory anomaly will present anomaly in some degree.S-value curves for the period of 19 months prior to Xiuyan earthquake will present high value anomalies(S≥0.18) and present peak value in January 1999.The spatial scanning of S-value also shows that anomaly peaks focus on the around of seismic epicenter,the image for the period of 3 months prior to Xiuyan 5.4 earthquake is more obvious anomaly.
引文
[1]蒋峻,等.地震前兆信息处理与软件系统,北京:地震出版社,2000.
[2]丁国瑜,等.中国岩石圈动力学概论,北京:地震出版社,1991.
[3]张德成,等.中国岩石圈动力学概论[M].北京:地震出版社,p251~260,1991.
[4]陈棋福,等.中国震例[M].北京:地震出版社,2003.
[2]丁国瑜,等.中国岩石圈动力学概论,北京:地震出版社,1991.
[3]张德成,等.中国岩石圈动力学概论[M].北京:地震出版社,p251~260,1991.
[4]陈棋福,等.中国震例[M].北京:地震出版社,2003.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心