强震等震线、余震区形状与地震构造关系的研究
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摘要
本文通过对川滇和华北地区不同地震构造环境中,1966年以来强震的等震线长宽比、余震区长度的对比研究,认为强震等震线的长宽比、余震区长度都与地震构造环境和震级相关。对于强震等震线的长宽比和余震区长度,地震构造环境和震级的影响相同的是,都与发震断裂是否位于活动地块边界,位于哪一级活动地块边界,是与边界方向一致的大断裂,还是配套小断裂等有关。最重要的是与活动断层的规模,尤其是与发震断裂的长度有关,也与震级有关。不同的是,强震等震线的长宽比明显受地表覆盖层的影响,而余震区长度与地表覆盖层关系不明显,似乎与震源破裂面长度的关系更密切。
In this paper,isoseismic lines,aftershock areas of strong earthquakes in Sichuan-Yunnan area and North China with their Seismotectonic environment have been compared and studied.The main results are: ① Both the rates between the length and the width of isoseismic lines,and the lengths of aftershock area of strong earthquakes are related to the lengths of their seismogenic faults,and are related to their magnitudes too.② The rates between the length and the width of isoseismic lines of strong earthquakes are also influenced by overburden in the region,but the lengths of aftershock area of strong earthquakes are not influenced by overburden in the region,maybe the latter can mainly reflect distribution of the seismogenic fault and nearby deep small faults.
In this paper,isoseismic lines,aftershock areas of strong earthquakes in Sichuan-Yunnan area and North China with their Seismotectonic environment have been compared and studied.The main results are: ① Both the rates between the length and the width of isoseismic lines,and the lengths of aftershock area of strong earthquakes are related to the lengths of their seismogenic faults,and are related to their magnitudes too.② The rates between the length and the width of isoseismic lines of strong earthquakes are also influenced by overburden in the region,but the lengths of aftershock area of strong earthquakes are not influenced by overburden in the region,maybe the latter can mainly reflect distribution of the seismogenic fault and nearby deep small faults.
引文
[1]中国地震局监测预报司组织编著.汶川8.0级地震科学研究报告[M].北京:地震出版社,2009.
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[3]陈棋福主编.中国震例[M].北京:地震出版社,(1992—1994),(1995—1996),2002;(1997—1999),2003;(2000—2002),2008.
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[5]新疆维吾尔自治区地震局.富蕴地震断裂带[M].北京:地震出版社,1985.
[6]张培震,邓起东,张国民,等.中国大陆强震活动与活动地块[J].中国科学:D辑,2003,B04:12-20.
[7]周荣军,陈国星,李勇,等.四川西部理塘-巴塘地区的活动断裂与1989年巴塘6.7级震群发震构造研究[J].地震地质,2005,27(1):31-43.
[8]韩渭宾,夏大德.松潘、平武7.2级地震与川青块体的运动[J].地震科学研究,1980,(1):39-48.
[9]林邦慧,陈天长,蒲晓虹,等.鲜水河断裂带强震的破裂过程与地震活动[J].地震学报,1986,8(1):1-20.
[10]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律的研究[J].岩石力学与工程学报,2008,27(12):2 585-2 592.
[2]张肇诚主编.中国震例[M].北京:地震出版社,(1966—1975),1988;(1976—1980),(1981—1985),1990;(1986—1988),1999;(1989—1991),2000.
[3]陈棋福主编.中国震例[M].北京:地震出版社,(1992—1994),(1995—1996),2002;(1997—1999),2003;(2000—2002),2008.
[4]国家地震局地质研究所,宁夏回族自治区地震局.海原活动断裂带[M].北京:地震出版社,1990.
[5]新疆维吾尔自治区地震局.富蕴地震断裂带[M].北京:地震出版社,1985.
[6]张培震,邓起东,张国民,等.中国大陆强震活动与活动地块[J].中国科学:D辑,2003,B04:12-20.
[7]周荣军,陈国星,李勇,等.四川西部理塘-巴塘地区的活动断裂与1989年巴塘6.7级震群发震构造研究[J].地震地质,2005,27(1):31-43.
[8]韩渭宾,夏大德.松潘、平武7.2级地震与川青块体的运动[J].地震科学研究,1980,(1):39-48.
[9]林邦慧,陈天长,蒲晓虹,等.鲜水河断裂带强震的破裂过程与地震活动[J].地震学报,1986,8(1):1-20.
[10]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律的研究[J].岩石力学与工程学报,2008,27(12):2 585-2 592.
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