青海及邻区中强地震序列类型及特征研究
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摘要
系统地整理和分析了 1 970～ 1 999年发生在青海及邻近地区的 6 5次MS ≥ 5.0地震序列 .这些地震序列可分为孤立型、主震 余震型、前震 主震 余震型和多震型4种 ,以孤立型为主 .其中有 1 8次MS ≥ 6 .0地震序列以主震 余震型为主 .这些地震序列分布于 4个地震构造带内 .每个地震带内地震的频度、强度及序列类型不同 .计算分析了地震序列早期特征参数的变化特征 ,认为b值和u值的变化对该区地震序列类型的早期判断有一定参考价值
Sequences of 65 M S≥5 earthquakes from 1970 to 1999 in Qinghai province and its vicinity are analyzed and studied.These sequences can be divided into isolated type,mainshock aftershock type,foreshock mainshock aftershock type and multishock type,in which isolated type is the most.There are 18 M S≥6.0 sequences in which mainshock aftershock type is the most in the 65 sequences.The sequences are distributed in Qilian,Chaidamu,Kekexili and Wulanwulahu seismic belts.Earthquake frequency,strength and sequence type in the four seismic belts are analyzed. Characteristic parameters of early days of the seismic sequences are calculated . The results show that b and u values are useful in early discrimination of seismic sequence type.
Sequences of 65 M S≥5 earthquakes from 1970 to 1999 in Qinghai province and its vicinity are analyzed and studied.These sequences can be divided into isolated type,mainshock aftershock type,foreshock mainshock aftershock type and multishock type,in which isolated type is the most.There are 18 M S≥6.0 sequences in which mainshock aftershock type is the most in the 65 sequences.The sequences are distributed in Qilian,Chaidamu,Kekexili and Wulanwulahu seismic belts.Earthquake frequency,strength and sequence type in the four seismic belts are analyzed. Characteristic parameters of early days of the seismic sequences are calculated . The results show that b and u values are useful in early discrimination of seismic sequence type.
引文
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[5] 朱传镇,王林英,舒曦,等.前震活动特征及其识别的研究[A].见:国家地震局预测预防司:地震短期预报的理论与方法———“八五”攻关三级课题论文集[C].北京:地震出版社,1997.32—37.
[6] 黄耘,郑江容.华东地区中强地震序列特征研究[J].地震,1999,19(2):190—198.
[2] 吴开统,焦远碧,吕培苓,等.地震序列概论[M ].北京:北京大学出版社,1990.97—175.
[3] 周翠英,张宇霞,王华林,等.地震序列类型的早期判断[A].见:国家地震局地震预防司.地震短期预报的理论与方法———“八五”攻关三级课题论文集[C].北京:地震出版社,1997.176—188.
[4] 林邦慧,李大鹏,刘杰,等.前震和前震序列研究[J].地震学报,1994,16(增刊):24—38.
[5] 朱传镇,王林英,舒曦,等.前震活动特征及其识别的研究[A].见:国家地震局预测预防司:地震短期预报的理论与方法———“八五”攻关三级课题论文集[C].北京:地震出版社,1997.32—37.
[6] 黄耘,郑江容.华东地区中强地震序列特征研究[J].地震,1999,19(2):190—198.
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