巴基斯坦曼塞赫拉7.8级地震对中国大陆大震趋势影响的初步研究
|
摘要
讨论了喜马拉雅弧型地震构造带西反射弧地带(简称“西触角区”),大地震活动的基本特征及2005年10月巴基斯坦曼塞赫拉7.8级地震发生后,对中国大陆地震趋势的可能影响。西触角区(N30~45°,E61~80°)大震活动存在显著的时间上10年左右成组性及两次大震时间间隔小于1个月的爆发性,地点上的成丛性,兴都库什深震区的地震有一定先兆意义,与东触角区(N20~29°,E95~102°)大地震也存在较好的相关性。沿欧亚大陆与印度洋、澳州板块碰撞带上印尼苏门答腊8.9级地震后,再次发生巴基斯坦7.8级大地震,显示出这一板缘地震带正处于活跃状态。研究认为未来1~2年应注意西触角区尤其是天山地震带的大震连发的危险性及东触角区(缅甸及川、滇为主)发生响应性大地震的可能性。对中国大陆内部其他地区大震形势的影响可能不大。
The seismicity along the arc area of the seismotectonic reflecion of Himalaya,the basic characteristics of strong earthquakes and the possible effectiog on the seismic tendency of main land of China after M7.8 Pakistan Earthquake on 8 October 2005 are discussed in theis paper.The strong earthquake activities around the western arc area along the seismotectonic reflection of Himalaya have 10 years interval period between two seismic groups and these two strong earthquake regions of Xingdu and Kushi are of precursor value.The strong earthquakes around westren region are relative to the eastren ones in statistical aspect.Aafter the M8.9 Sumatra Earthquake on 26 December 2004 along the crushing belt between Europe and Asia plates,the M7.8 Pakistan Earthquake on 8 October 2005 shows that the activity level around the plate edge of Himalaya is high.Our results show that the possible earthquakes in form of groups may occur around both the western and western regions of Himalaya,especially in seismic belt of Tianshan where are strong earthquakes but the effect n the seismic tendency in main land of China is small in 1 to 2 years.
The seismicity along the arc area of the seismotectonic reflecion of Himalaya,the basic characteristics of strong earthquakes and the possible effectiog on the seismic tendency of main land of China after M7.8 Pakistan Earthquake on 8 October 2005 are discussed in theis paper.The strong earthquake activities around the western arc area along the seismotectonic reflection of Himalaya have 10 years interval period between two seismic groups and these two strong earthquake regions of Xingdu and Kushi are of precursor value.The strong earthquakes around westren region are relative to the eastren ones in statistical aspect.Aafter the M8.9 Sumatra Earthquake on 26 December 2004 along the crushing belt between Europe and Asia plates,the M7.8 Pakistan Earthquake on 8 October 2005 shows that the activity level around the plate edge of Himalaya is high.Our results show that the possible earthquakes in form of groups may occur around both the western and western regions of Himalaya,especially in seismic belt of Tianshan where are strong earthquakes but the effect n the seismic tendency in main land of China is small in 1 to 2 years.
引文
[1]黄圣睦,董瑞英.强震活动图像特征与强震危险区经验性预测依据的初步研究[J].四川地震,2005,(2).
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