浙江及邻区地震精定位及应用研究
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摘要
对2006年2月～2010年4月浙江数字地震台网所有记录到的浙江及邻区范围内437个地震事件重新进行震相识别及定位,筛选出震相清晰且有4个台站记录的291个地震事件后,用双差地震定位法进行精确定位,得到多个事件内部相关事件之间的距离。结果表明,重新定位后地震震源的相对位置比常规地震定位方法得到的结果更加精确。此外本文得到了该区域内多个地震序列的精确活动图像,并根据新的定位结果讨论了地震分布、发震与断裂构造的关系,结果显示出较好的一致性。
437 digital seismic events recorded by the Zhejiang Digital Seismic Network in Zhejiang and its adjacent area from February 2006 to April 2010 underwent a shock acquaintance and positioning.291 events with clear phases recorded by 4 stations were screened out through the double difference earthquake location method for accurate positioning and multiple event internal distance between events was obtained.The results show that the repositioning of seismic source relative position is more accurate than conventional seismic location method.In addition this paper obtains accurate moving images of regional earthquake sequences,and according to the new positioning results discusses the distribution of earthquake and relationship between seismogenic structure and fracture.The conclusion shows a good consistency.
437 digital seismic events recorded by the Zhejiang Digital Seismic Network in Zhejiang and its adjacent area from February 2006 to April 2010 underwent a shock acquaintance and positioning.291 events with clear phases recorded by 4 stations were screened out through the double difference earthquake location method for accurate positioning and multiple event internal distance between events was obtained.The results show that the repositioning of seismic source relative position is more accurate than conventional seismic location method.In addition this paper obtains accurate moving images of regional earthquake sequences,and according to the new positioning results discusses the distribution of earthquake and relationship between seismogenic structure and fracture.The conclusion shows a good consistency.
引文
陈翰林、赵翠萍、修济刚等,2009,龙滩水库地震精定位及活动特征研究,地球物理学报,52(8),2035～2043。
卢显、张晓东、周龙泉等,2010,紫坪铺水库库区地震精定位研究及分析,地震,30(2),129～134。
钱祝、虞雪君、孙士宏等,1997,皎口地震趋势的跟踪预测研究,地震学刊,1997,(3),3～16。
谢辉、金春华、蔡新华等,2011,MSDP单纯型和HYP2000定位方法对比研究,地震地磁观测与研究,32(5),15～19。
杨智娴、陈运泰、张宏志,2002,张北-尚义地震序列的重新定位和发震构造,地震学报,24(4),366～377。
杨智娴、陈运泰、郑月军等,2003,双差地震定位法在我国中西部地区地震精确定位中的应用,中国科学,33(增刊),129～134。
钟羽云、张震峰、阚宝祥,2010,温州珊溪水库地震重新定位与速度结构联合反演,中国地震,26(3),265～272。
朱艾斓、徐锡伟、周永胜等,2005,川西地区小震重新定位及其活动构造意义,地球物理学报,48(3),629～636。
Waldhauser F,Ellsworth W L,2003,双差地震定位算法:方法和在加州北海沃德断层上的应用,世界地震译丛,(4),34～53.
Geiger L,1912,Probability method for the determination of earthquake epicenters from arrival time only,Bul1.St.Louis.Univ,8,60～71.
Gomberg J S,Shedlock K M,Roecker S W,1990,The effect of S-wave arrival times on the accuracy of hypocenter estimation,BullSeism Soc Amer,80,1605～1628.
Pavlis G L,1986,Appraising earthquake hypocenter location errors:a complete,practical approach for single-event locations,BullSeism Soc Amer,76,1699～1717.
Waldhauser F,Ellsworth W L,2000,A double-difference earthquake location algorithm:method and application to the NorthernHayward Fault,California,Bull Seism Soc Amer,90(6),1353～1368.
卢显、张晓东、周龙泉等,2010,紫坪铺水库库区地震精定位研究及分析,地震,30(2),129～134。
钱祝、虞雪君、孙士宏等,1997,皎口地震趋势的跟踪预测研究,地震学刊,1997,(3),3～16。
谢辉、金春华、蔡新华等,2011,MSDP单纯型和HYP2000定位方法对比研究,地震地磁观测与研究,32(5),15～19。
杨智娴、陈运泰、张宏志,2002,张北-尚义地震序列的重新定位和发震构造,地震学报,24(4),366～377。
杨智娴、陈运泰、郑月军等,2003,双差地震定位法在我国中西部地区地震精确定位中的应用,中国科学,33(增刊),129～134。
钟羽云、张震峰、阚宝祥,2010,温州珊溪水库地震重新定位与速度结构联合反演,中国地震,26(3),265～272。
朱艾斓、徐锡伟、周永胜等,2005,川西地区小震重新定位及其活动构造意义,地球物理学报,48(3),629～636。
Waldhauser F,Ellsworth W L,2003,双差地震定位算法:方法和在加州北海沃德断层上的应用,世界地震译丛,(4),34～53.
Geiger L,1912,Probability method for the determination of earthquake epicenters from arrival time only,Bul1.St.Louis.Univ,8,60～71.
Gomberg J S,Shedlock K M,Roecker S W,1990,The effect of S-wave arrival times on the accuracy of hypocenter estimation,BullSeism Soc Amer,80,1605～1628.
Pavlis G L,1986,Appraising earthquake hypocenter location errors:a complete,practical approach for single-event locations,BullSeism Soc Amer,76,1699～1717.
Waldhauser F,Ellsworth W L,2000,A double-difference earthquake location algorithm:method and application to the NorthernHayward Fault,California,Bull Seism Soc Amer,90(6),1353～1368.
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