福建水口库区次级断裂的应力分析和活动特征研究
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摘要
为了解水口水库地区次级断裂的受力性质和活动特征,选用库区15个P波初动清晰可靠的地震震源机制解,采用力轴张量计算法推算了该区构造应力场的主轴方向,进而对断裂进行了应力分析。结果表明,湾口断裂受力性质为压性,其余为张性。根据库区布设的6个跨断层短水准场地观测资料,通过线性拟合方法,发现西瓜洲断裂为正断活动,其余为逆断活动。最后对两种方法得到的结果进行了比较。
To understand the stress nature and activity characteristics of secondary faults in Shuikou reservoir area,with the focal mechanism data of 15 earthquakes which have clear and reliable P-wave first motions,we deduced the direction of principal axes of tectonic stress field in this area by using the algorithm of mechanical axis tensor,and then made stress analysis of the faults.The results show that the stress nature of only Wankou fault is compressive and the others are tensional.On the basis of cross-fault short-leveling data of 6 sites in the reservoir area,we found out,by using the linear fitting method,that the Xiguazhou fault moves normally and the other move reversely.Finally,the results with the two methods were compared and discussed.
To understand the stress nature and activity characteristics of secondary faults in Shuikou reservoir area,with the focal mechanism data of 15 earthquakes which have clear and reliable P-wave first motions,we deduced the direction of principal axes of tectonic stress field in this area by using the algorithm of mechanical axis tensor,and then made stress analysis of the faults.The results show that the stress nature of only Wankou fault is compressive and the others are tensional.On the basis of cross-fault short-leveling data of 6 sites in the reservoir area,we found out,by using the linear fitting method,that the Xiguazhou fault moves normally and the other move reversely.Finally,the results with the two methods were compared and discussed.
引文
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6丁祥焕,王耀东,叶盛基.福建东南沿海活动断裂与地震[M].福州:福建科学技术出版社,1999.
7钟继茂,程万正.由多个地震震源机制解求川滇地区平均应力场方向[J].地震学报,2006,28(4):337-346.
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10彭美凤,林世敏,林松建.水口水库地震及其活动特征[J].华南地震,1997,17(2):83-89.
11许振栋,陈传昌.水口水库诱发地震研究[J].大地测量与地球动力学,2004,24(2):58-63.
12刘峰.水口水库诱震的环境条件和库区垂直形变特征[J].华南地震,1999,19(4):77-81.
13 Aki K and Richards P G.Quantitative seismology:Theoryand methods[M].San Francisco:Freeman and Company,1980.
2郑小菁,陈莹.水口水库诱发地震与库水位变化相关性研究[J].大地测量与地球动力学,2005,25(专刊):41-44.
3郭逢英,等.水口库区的地形变观测与诱发地震[J].地壳形变与地震,1999,19(增1):170-174.
4许振栋.福建水口水库地震成因探讨[J].大地测量与地球动力学,2005,25(专刊):67-70.
5许振栋.福建水口水库诱发地震最大震级预测[J].地震地磁观测与研究,2004,25(3):58-62.
6丁祥焕,王耀东,叶盛基.福建东南沿海活动断裂与地震[M].福州:福建科学技术出版社,1999.
7钟继茂,程万正.由多个地震震源机制解求川滇地区平均应力场方向[J].地震学报,2006,28(4):337-346.
8林松建,连玉平,陈为伟.水口水库地区地震震源机制解特征分析[J].地震,2007,27(1):114-119.
9林松建,等.水口水库诱发地震特征与发震断裂的探讨[J].大地测量与地球动力学,2007,27(1):40-44.
10彭美凤,林世敏,林松建.水口水库地震及其活动特征[J].华南地震,1997,17(2):83-89.
11许振栋,陈传昌.水口水库诱发地震研究[J].大地测量与地球动力学,2004,24(2):58-63.
12刘峰.水口水库诱震的环境条件和库区垂直形变特征[J].华南地震,1999,19(4):77-81.
13 Aki K and Richards P G.Quantitative seismology:Theoryand methods[M].San Francisco:Freeman and Company,1980.
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