新疆伽师强震群与其他典型强震群对比研究
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摘要
对比研究了国内、外9次6级以上强震群,发现强震群序列具有强度大、频度高、中强余震频繁、余震衰减起伏大、持续时间长、中强震前小震活动显示平静的特点。与主余型地震相比震群型地震b值大、p值小,最后一次主要地震发生后序列衰减变慢,多数地震的余震具有共轭分布特征,主要地震的震源深度和破裂方向呈多样性,地震破裂具有继承性。新疆伽师强震群与乌兹别克斯坦加兹里强震群不但在分段上极为相似,而且随时间的发展在能量释放的分配形式上也极为相似,且余震都呈共轭分布,主要地震迁移呈多侧扩展型,强震前中、小地震表现平静。从频度及强度上看,这两次强震群第一组强震发生后余震频度及强度较低,第二组强震发生后余震频度及强度较高,第三组强震发生后余震频度及强度最高。
The article studies 9 strong earthquake swarms of with the magnitude M_S≥6.0 at home and abroad,which shows strong earthquake swarm sequence is characteristics of great magnitude and high frequency,frequent mid-strong aftershocks,and aftershock decay fluctuating and lasting long time,small earthquake activity quiescence before mid-strong earthquake.Comparing with main-aftershock type earthquake,swarm is characteristics of big b value and small p value,and sequence decay is getting slow after the last major earthquake,and the aftershocks of most earthquakes distribute in conjugated shape,and focus depth and rupture direction of major earthquake are diverse,and rupture is successive.Jiashi strong earthquake swarm of Xin Jiang is similar to Jazily strong swarm of Uzbekistan,not only time stage of seiesmicity,but distributing form of energy release with time,and aftershocks distribute in conjugated shape.Migration of major earthquake extends to multi-sides,and mid-small earthquakes appear quiescent before strong earthquakes.According to frequency and strength,aftershock frequency and strength are weak after the first group strong earthquakes of the two strong earthquake swarm,and high after the second group ones,and highest after the third group ones.
The article studies 9 strong earthquake swarms of with the magnitude M_S≥6.0 at home and abroad,which shows strong earthquake swarm sequence is characteristics of great magnitude and high frequency,frequent mid-strong aftershocks,and aftershock decay fluctuating and lasting long time,small earthquake activity quiescence before mid-strong earthquake.Comparing with main-aftershock type earthquake,swarm is characteristics of big b value and small p value,and sequence decay is getting slow after the last major earthquake,and the aftershocks of most earthquakes distribute in conjugated shape,and focus depth and rupture direction of major earthquake are diverse,and rupture is successive.Jiashi strong earthquake swarm of Xin Jiang is similar to Jazily strong swarm of Uzbekistan,not only time stage of seiesmicity,but distributing form of energy release with time,and aftershocks distribute in conjugated shape.Migration of major earthquake extends to multi-sides,and mid-small earthquakes appear quiescent before strong earthquakes.According to frequency and strength,aftershock frequency and strength are weak after the first group strong earthquakes of the two strong earthquake swarm,and high after the second group ones,and highest after the third group ones.
引文
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[2]焦远碧.地震序列类型、地震序列b值与地震大形势关系初探[J].地震,1998,18(1):33-39.
[3]刁守中,周翠英,华爱军,等.历史地震序列类型的划分及其应用刍议[J].中国地震,2002,18(3):304-310.
[4]曾健,韩谓宾,王红,等.MS>6.0级强震后地震序列类型的模糊聚类分析[J].西北地震学报,1994,16(3):35-41.
[5]蔡煜东,宫家文,甘俊人,等.地震序列类型预测的神经网络方法[J].地震研究,1994,17(1):40-45.
[6]蔡煜东.地震序列类型预测的遗传程序设计方法[J].地震学报,1996,18(1):44-47.
[7]彭克银,高伟.分形方法在地震序列类型早期判断中的应用[J].地震,1996,16(1):68-74.
[8]焦远碧,刘杰.自然类比法在地震序列分类及震后趋势早期判别中的应用[J].地震,1996,16(1):22-32.
[9]周仕勇,许忠淮.地震序列研究综述[J].中国地震,1999,15(3):268-277.
[10]刘丽芳,苏有锦,付虹,等.云南省MS≥6.0地震序列的基本特征[J].内陆地震,2002,16(1):62-68.
[11]郭和,张启明,董国胜,等.滇西地震序列类型的统计特征分析[J].地震研究,1978,25(3):262-266.
[12]赵志新,尾池和夫,松树一南,等.中国大陆性地震的余震活动p值[J].地震学报,1992,14(1):10-16.
[13]马宗晋,傅征祥,张郢珍,等.中国九大地震[M].北京:地震出版社,1982:6-11.
[14]刘正荣,晏风桐.龙陵共轭地震群的特征[J].地震研究,1978,1(2):27-29.
[15]河北省地震局.一九六六年邢台地震[M].北京:地震出版社,1986:12-19.
[16]单新建,何玉梅,朱燕,等.新疆伽师强震群的震源破裂特征[J].地震地质,2002,24(1):59-68.
[17]高国英,聂晓红,夏爱国.2003年伽师6.8级地震序列特征和震源机制的初步研究[J].中国地震,2004,20(2):179-186.
[18]刘启元,陈九辉,李顺成.新疆伽师强震群区三维地壳上地幔S波速度结构及其地震成因的探讨[J].地球物理学报,2000,43(3):356-365.
[19]王筱荣,孙甲宁,王季达.1997~2003年新疆伽师地震序列时空分布研究[J].内陆地震,2005,19(2):113-121.
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