确定地震破裂带长度的新方法——以中卫1709年7(1/2)地震为例
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摘要
目的利用地震地表破裂与震级、震源深度的关系,估算地震地表破裂带长度。方法在总结前人成果基础上,结合最新实地调研结果,建立了地震破裂长度与震级、震源深度的关系式和地表现代活动破裂标志,研究宁夏中卫1709年712级地震破裂带的规模。结果利用关系式确定的破裂带基本长度为103km,根据地表地震破裂标志确定的中卫地震地表破裂带长度为110km,估算结果与实际调研结果基本吻合;该地震地表破裂带不仅跨过了黄河,延伸到了大堆堆沟一带,而且还继续向西延伸到了小洪山一带。结论地震地表破裂长度不仅与震级有关,还与震源深度有关,所建立的关系式具有一定的实用性,可以利用地表破裂规模估算古地震强度。
Aim To utilize relation between fracture zone length of earthquake, earthquake magnitude and focus depth to estimate the scale of earthquake fracture zone.Methods Based on existent results, combine with field survey, and using the relation between fracture zone length of earthquake, earthquake magnitude and focus depth which is established and the fracture marks of recent activity, the scale of fracture zone of 1709 Zhongwei earthquake with ms= 7 1/2 in Ningxia has been studied.Results The elementary length of the fracture zone which is estimated by the relation was 103 km, and based on the fracture marks, the fracture zone length of the earthquake was 110 km. The estimated result is close to the field survey result. The result says that the fracture zone of the earthquake crossed the Yellow river and extends to Daduiduigou, but also westward arrives at the Xiaohongshan.Conclusion Fracture zone length of earthquake not only has something to do with earthquake magnitude, but also relates to focus depth. The relation established by the paper can be used in practice, and take scale of earthquake fracture zone to estimate palaeo-earthquake magnitude.
Aim To utilize relation between fracture zone length of earthquake, earthquake magnitude and focus depth to estimate the scale of earthquake fracture zone.Methods Based on existent results, combine with field survey, and using the relation between fracture zone length of earthquake, earthquake magnitude and focus depth which is established and the fracture marks of recent activity, the scale of fracture zone of 1709 Zhongwei earthquake with ms= 7 1/2 in Ningxia has been studied.Results The elementary length of the fracture zone which is estimated by the relation was 103 km, and based on the fracture marks, the fracture zone length of the earthquake was 110 km. The estimated result is close to the field survey result. The result says that the fracture zone of the earthquake crossed the Yellow river and extends to Daduiduigou, but also westward arrives at the Xiaohongshan.Conclusion Fracture zone length of earthquake not only has something to do with earthquake magnitude, but also relates to focus depth. The relation established by the paper can be used in practice, and take scale of earthquake fracture zone to estimate palaeo-earthquake magnitude.
引文
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[3] 张维歧,焦德成,柴炽章,等.宁夏香山-天景山弧形断裂带新活动特征及1709年中卫南7级地震形变带[J].地震地质,1988,10(3):12-20.
[4] 聂 政,林伟凡.中卫-同心断裂带中段:香山-天景山断裂带1709年721级地震形变带特征[J].地震,1993,13(2):41-44.
[5] 田勤俭,丁国瑜,申旭辉.青藏高原东北隅强震构造模型[J].地震,2002,22(1):9-16.
[6] 傅征祥.中国大陆地震活动性力学研究[M].北京:地震出版社,1997.
[7] 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.
[8] 郭增建,秦保燕.地震时地表产生断层错动的预测[J].国际地震动态,1991,(5):9-11.
[9] 韩文峰.黄河黑山峡大柳树松动岩体工程地质研究[M].兰州:甘肃科学出版社,1993.
[10] 马宗晋,高祥林.大陆多震层的研究与震源体的破裂发展[A].马宗晋.大陆多震层研究[C].北京:地震出版社,1992.1-8.
[11] 马润勇,彭建兵,门玉明,等.逆冲断层发育的力学机制研究[J].西北大学学报(自然科学版).2003,33(2):196-200.
[12] 傅承义,陈运泰,祁贵仲.地球物理学基础[M].北京:科学出版社,1985.
[13] 马润勇.青藏高原东北缘构造活动及其工程灾害效应[D].西安:长安大学,2003
[14] 邓起东,刘百篪,张培震,等.活动断裂工程安全评价和位错量的定量评估[A].国家地震局地质研究所.活动断裂研究(2)[C].北京:地震出版社,1992.236-246.
[15] 彭建兵,毛彦龙,范 文,等.区域稳定性动力学研究[M].北京:科学出版社,2001.
[16] 闵 伟,张培震,邓起东.中卫-同心断裂带全新世古地震研究[J].地震地质,2001,23(3):357-366.
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