甘肃岷县漳县M_S6.6地震与甘肃形变异常情况探讨
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摘要
对岷县漳县MS6.6地震震中附近的甘肃省形变观测资料进行了初步分析,发现了一些异常情况,总结出来供大家讨论。
Minxian,located in southwestern Dingxi City of southern Gansu in the eastern region of the Qinghai Tibet Plateau,borders on Longnan and the West Qinling Mountains and is the geometric center of Dingxi,Tianshui,Longnan,and Gannan.The geological structure of Minxian belongs to the Qinling Mountains Hercynian geosyncline fold belt at the north branch of the Western Qinling Mountains fold belt.At 7:45CST on July 22,2013,an MS6.6 earthquake occurred at the junction of Minxian and Zhangxian with a focal depth of 20km.The earthquake occurred along the north branch Lintan-Dangchang fracture,126km from Dingxi and 17km from Minxian County.Strong tremors were felt by residents in Dingxi,Tianshui,Longnan,and Gannan;those in Lanzhou and Baiyin also detected movement.The Earthquake Administration of Gansu province operates 8deformation observation stations and 15deformation observation projects situated within 300km of the earthquake focus that include DSQ and SSY at Tanchang station;CZB at Wushan station;CZB and YRY at Linxia station;YZ-1at Liujiaxia station;CZB at Lanzhou station;DSQ,SSY,SSY-Ⅱ,SSQ,and PET at Lanzhou Shilidian station;and DSQ and SSY at Baiyin station.This study focuses on the data of 15observation projects to conduct preliminary analysis,through which abnormal variation was detected in the data of 10projects.Moreover,DSQ and SSY at Tanchang station and CZB at Lanzhou station showed obviousβ,β2,andγ1stages,and CZB at Wushan and Liangshui exhibited obviousβ1andβ2stages.Therefore,deformation anomalies were present prior to the MS6.6 earthquake.Although the distance between Lanzhou and Shilidian stations is less than 10km,only DSQ,SSY,and SSY-Ⅱ at Shilidian exhibited a significant bulge anomaly;SSQ of Shilidian showed no obvious abnormalities.Such a huge discrepancy in such a close proximity required further explanation.It was determined that the CZB component at Linxia station began to increase rapidly in January 2011and entered a declining trend in August.At the same time,the EW component began to alter from a normal decline,which resulted in significant deformation.These changes are unrelated to the NS component.Therefore,further research is needed to determine the reason for such anomalies.
Minxian,located in southwestern Dingxi City of southern Gansu in the eastern region of the Qinghai Tibet Plateau,borders on Longnan and the West Qinling Mountains and is the geometric center of Dingxi,Tianshui,Longnan,and Gannan.The geological structure of Minxian belongs to the Qinling Mountains Hercynian geosyncline fold belt at the north branch of the Western Qinling Mountains fold belt.At 7:45CST on July 22,2013,an MS6.6 earthquake occurred at the junction of Minxian and Zhangxian with a focal depth of 20km.The earthquake occurred along the north branch Lintan-Dangchang fracture,126km from Dingxi and 17km from Minxian County.Strong tremors were felt by residents in Dingxi,Tianshui,Longnan,and Gannan;those in Lanzhou and Baiyin also detected movement.The Earthquake Administration of Gansu province operates 8deformation observation stations and 15deformation observation projects situated within 300km of the earthquake focus that include DSQ and SSY at Tanchang station;CZB at Wushan station;CZB and YRY at Linxia station;YZ-1at Liujiaxia station;CZB at Lanzhou station;DSQ,SSY,SSY-Ⅱ,SSQ,and PET at Lanzhou Shilidian station;and DSQ and SSY at Baiyin station.This study focuses on the data of 15observation projects to conduct preliminary analysis,through which abnormal variation was detected in the data of 10projects.Moreover,DSQ and SSY at Tanchang station and CZB at Lanzhou station showed obviousβ,β2,andγ1stages,and CZB at Wushan and Liangshui exhibited obviousβ1andβ2stages.Therefore,deformation anomalies were present prior to the MS6.6 earthquake.Although the distance between Lanzhou and Shilidian stations is less than 10km,only DSQ,SSY,and SSY-Ⅱ at Shilidian exhibited a significant bulge anomaly;SSQ of Shilidian showed no obvious abnormalities.Such a huge discrepancy in such a close proximity required further explanation.It was determined that the CZB component at Linxia station began to increase rapidly in January 2011and entered a declining trend in August.At the same time,the EW component began to alter from a normal decline,which resulted in significant deformation.These changes are unrelated to the NS component.Therefore,further research is needed to determine the reason for such anomalies.
引文
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[12]李莹甄,聂晓红,王在华,等.2008年新疆和静5.3级地震异常特征及短临跟踪回顾分析[J].西北地震学报,2010,32(4):381-387.LI Ying-zhen,NIE Xiao-hong,WANG Zai-hua,et al.Retrospective Analysis on Short-term Tracing and Prediction before Hejing MS5.6Earthquake in Xinjiang in 2008[J].Northwestern Seismological Journal,2010,32(4):381-387.(in Chinese)
[2]邱泽华.关于地震前兆的判据问题[J].大地测量与地球动力学,2010,30(增刊Ⅱ):1-5.QIU Ze-hua.How to Identify Earthquake Precursor[J].Journal of Geodesy and Geodynamics,2010,30(SuppⅡ):1-5.(in Chinese)
[3]中国地震局监测预报司.地形变测量(第一版)[M].北京:地震出版社,2008:320-347.Monitoring and Predicting Department,China Earthquake Administration.Ground Deformation Measurement(First edition)[M].Beijing:Seismological Press,2008:320-347.(in Chinese)
[4]姜振海,史小平.兰州CZB-1型竖直摆倾斜仪观测资料初步分析[J].地震研究,2006,29(1):55-59.JIANG Zhen-hai,SHI Xiao-ping.Primary Study on CZB-1Type Vertical Pendulum Tilt meter Data at Lanzhou Observatory[J].Journal of Seismological Research,2006,29(1):55-59.(in Chinese)
[5]王梅,李峰,孔向阳,等.数字化形变观测干扰识别[J].大地测量与地球动力学,2004,24(1):94-98.WANG Mei,LI Feng,KONG Xiang-yang,et al.ID Entification of Disturbance of Digital DEFOrmation Observations[J].Journal of Geodesy and Geodynamics,2004,24(1):94-98.(in Chinese)
[6]薄万举.形变异常与干扰关系的再认识[J].大地测量与地球动力学,2004,30(1):6-8.BO Wang-ju.Study on Relation between Crust Deformation Anomaly and Disturbances[J].Journal of Geodesy and Geodynamics,2004,30(1):6-8.(in Chinese)
[7]范雷彪,任忠.调整形变观测思路探寻地震预报的新途径[J].西北地震学报,2011,33(4):408-412.FAN Lei-biao,REN Zhong.Adjust Deformdtion Observational Way to Explore New Pash of Earthquake Forecasting[J].Northwestern Seismological Journal,2011,33(4):408-412.(in Chinese)
[8]邱泽华,石耀霖.地震应变变化的理论量级与最大传递距离关系[J].大地测量与地球动力学,2004,24(2):99-105.QIU Ze-hua,SHI Yao-lin.Relationchip between Theoretic Magnitude and Longest Propagation Distance of Seismic Strain Change[J].Journal of Geodesy and Geodynamics,2004,24(2):99-105.(in Chinese)
[9]李瑞莎,张希,唐红涛,等.玉门、民乐等地震前跨断层形变异常及与定点前兆观测的相互印证[J].西北地震学报,2012,34(4):388-392.LI Rui-sha,ZHANG Xi,THANG Hong-tao,et al.Cross-fault Deformation Anomaly and Confirm Each Other with the Fixedpoint Precursors Observation before Yumen and Minle Earthquakes[J].Northwestern Seismological Journal,2012,34(4):388 -392.(in Chinese)
[10]池顺良,刘琦,池毅,等.2013年庐山MS7 .0地震的震前及临震应变异常[J].地震学报,2013,35(3):296-303.CHI Shun-liang,LIU Qi,CHI Yi,et al.Borehole strain anomalies defore the 20April 2013Lushan MS7 .0earthquake[J].Acta Seismologica Sinica,2013,35(3):296-303.(in Chinese)
[11]蒋骏,张雁滨,林钢,等.应用地震连续形变观测技术有效监测地震前兆[J].大地测量与地球动力学,2011,31(4):10-17.JIANG Jun,ZHANG Yian-bin,LIN Gang,et al.Application of Seismic Deformation Observation Techiques to Effectively Monntor Earthquake Precursor[J].Journal of Geodesy and Geodynamics,2011,31(4):10-17.(in Chinese)
[12]李莹甄,聂晓红,王在华,等.2008年新疆和静5.3级地震异常特征及短临跟踪回顾分析[J].西北地震学报,2010,32(4):381-387.LI Ying-zhen,NIE Xiao-hong,WANG Zai-hua,et al.Retrospective Analysis on Short-term Tracing and Prediction before Hejing MS5.6Earthquake in Xinjiang in 2008[J].Northwestern Seismological Journal,2010,32(4):381-387.(in Chinese)
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