C、D、M_f值综合异常交汇区在大华北地区中强震前的短期异常变化
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摘要
华东和华北区 1 970～ 1 998年 2 6个MS≥ 5.0地震前 2 3个地震存在C、D、Mf 综合异常区的中期异常。本文在此基础上 ,研究了这些异常在一年内的中短期变化。认为Mf 异常面积的短期变化最为显著 ,2 3个存在中期异常的地震中 2 1个地震前 6个月有 |η|≥ 0 .4的短期变化 ,其中 63%震前出现过地震活动平静 ,还有 37%为持续增强。最后用岩石刚度和压机刚度之比对岩石破裂前声发射的平静期长短的实验结果作了初步解释。
It is found that the medium term anomalies of comprehensive anomalous area of C,D and M f values appeared before 23 earthquakes of M S≥5.0 in eastern and northern China from 1970 to 1998. The short medium term variations of these anomalies have been studied. It is considered that the short term variation of M f anomalous area is most significant, and 21 of 23 earthquakes, which have medium term anomalies, had short term variations of | η |≥0.4 in 6 months before the earthquakes, and seismicity is quiescence before 63% of 21 earthqukes, and had continuously strengthened before others. This phemomen is interpreted using experiment result of effect of ratio beteewn rigidities of rock and press machine on the quiescence phase duration sonic emmision before rock rupture.
It is found that the medium term anomalies of comprehensive anomalous area of C,D and M f values appeared before 23 earthquakes of M S≥5.0 in eastern and northern China from 1970 to 1998. The short medium term variations of these anomalies have been studied. It is considered that the short term variation of M f anomalous area is most significant, and 21 of 23 earthquakes, which have medium term anomalies, had short term variations of | η |≥0.4 in 6 months before the earthquakes, and seismicity is quiescence before 63% of 21 earthqukes, and had continuously strengthened before others. This phemomen is interpreted using experiment result of effect of ratio beteewn rigidities of rock and press machine on the quiescence phase duration sonic emmision before rock rupture.
引文
①王琤琤 ,王炜 ,刘红桂 ,等 .C、D、Mf 值综合异常交汇区在华东地区中强地震前的中期异常 .地震 .(待发表 )。
①王炜 ,戴维系 .地震强度因子Mf 值在华北中强以上地震前的短期变化 .国家地震局科技监测司 .“八五”重点课题研究报告 .1 994 .
[1] 梅世蓉 ,薛 艳 ,宋治平 .华北地震区强震前地震活动长期演变过程的共性 [A].国家地震局预测预防司编 .地震短临预报的理论与方法———“八五”攻关三级课题论文集 [C].北京 :地震出版社 ,1998.3-12 .
[2 ] 王 炜 ,刘震华 .地震时间间隔的统计分布及其地震危险度D值在华北大震前的异常变化 [J].地震学报 ,1987,9(2 ) :113- 12 7.
[3] 王 炜 ,潘坚云 ,黄冰树 .地震空间集中度C值及其在地震预报中的应用 [A].国家地震局科技司编 .地震预报方法实用化研究文集 ,地震学专辑 [C].北京 :学术书刊出版社 ,1989.12 7- 141.
[4 ] 王 炜 ,戴维乐 ,黄冰树 .地震震级的统计分布及其地震强度因子Mf 值在华北中强以上地震前的异常变化 [J].中国地震 ,1994 ,10 (增刊 ) :95- 110 .
[5] 许昭永 ,梅世蓉 ,庄灿涛 ,等 .真三轴压机刚度对岩石破裂声发射的影响及地震活动性的关系 [J].地震学报 ,1991,13(2 ) :2 2 3- 2 33.
①王炜 ,戴维系 .地震强度因子Mf 值在华北中强以上地震前的短期变化 .国家地震局科技监测司 .“八五”重点课题研究报告 .1 994 .
[1] 梅世蓉 ,薛 艳 ,宋治平 .华北地震区强震前地震活动长期演变过程的共性 [A].国家地震局预测预防司编 .地震短临预报的理论与方法———“八五”攻关三级课题论文集 [C].北京 :地震出版社 ,1998.3-12 .
[2 ] 王 炜 ,刘震华 .地震时间间隔的统计分布及其地震危险度D值在华北大震前的异常变化 [J].地震学报 ,1987,9(2 ) :113- 12 7.
[3] 王 炜 ,潘坚云 ,黄冰树 .地震空间集中度C值及其在地震预报中的应用 [A].国家地震局科技司编 .地震预报方法实用化研究文集 ,地震学专辑 [C].北京 :学术书刊出版社 ,1989.12 7- 141.
[4 ] 王 炜 ,戴维乐 ,黄冰树 .地震震级的统计分布及其地震强度因子Mf 值在华北中强以上地震前的异常变化 [J].中国地震 ,1994 ,10 (增刊 ) :95- 110 .
[5] 许昭永 ,梅世蓉 ,庄灿涛 ,等 .真三轴压机刚度对岩石破裂声发射的影响及地震活动性的关系 [J].地震学报 ,1991,13(2 ) :2 2 3- 2 33.
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