岷县-漳县M_S6.6地震前重力分形指数异常分析
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摘要
以2013-07-22甘肃岷县与漳县交界的M_S6.6地震为研究对象,采用去趋势波动分析方法处理兰州、高台2个台2011～2015年重力观测资料,试图提取这次地震前的相关重力异常信息。结果表明,以9.4倍的该台分形指数标准差为异常阈值,岷县-漳县地震前这2个台的重力分形指数均出现相似的异常升高过程,表明震前重力变化具有定向持续特征,显示出长程相关性,是孕震过程中物质运移、密度连续变化的反映,应该是与这次地震有关联的重要信息。结合其他学者的研究结果初步推测,这个异常变化可能与中下地壳乃至上地幔的物质运移有关。
In this study, we use gravity observation data from two stations in Lanzhou and Gaotai from 2011 to 2015. The M_S6.6 earthquake, which occurred at the junction of Minxian and Zhangxian on July 22, 2013, is taken as the research object. The detrended fluctuation analysis method is used to deal with the continuous observation data of the two stations, and to try to extract anomaly information on gravity before the earthquake. The results show, with 9.4 times the standard deviation of the fractal index of the station as abnormal threshold, that there is a similar abnormal increase process before the earthquake on the gravity fractal index of the two stations. This indicates the gravity variation before the earthquake, has a continuous feature and shows a long-range correlation. This may be important information related to the earthquake. The study of this gravity fractal exponent is only preliminary and exploratory. Combined with the research results of other scholars, it is preliminarily speculated that this abnormal change may be related to the material migration in the middle and lower crust and even the upper mantle.
In this study, we use gravity observation data from two stations in Lanzhou and Gaotai from 2011 to 2015. The M_S6.6 earthquake, which occurred at the junction of Minxian and Zhangxian on July 22, 2013, is taken as the research object. The detrended fluctuation analysis method is used to deal with the continuous observation data of the two stations, and to try to extract anomaly information on gravity before the earthquake. The results show, with 9.4 times the standard deviation of the fractal index of the station as abnormal threshold, that there is a similar abnormal increase process before the earthquake on the gravity fractal index of the two stations. This indicates the gravity variation before the earthquake, has a continuous feature and shows a long-range correlation. This may be important information related to the earthquake. The study of this gravity fractal exponent is only preliminary and exploratory. Combined with the research results of other scholars, it is preliminarily speculated that this abnormal change may be related to the material migration in the middle and lower crust and even the upper mantle.
引文
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[10] 刘立炜,李宁,史旗.DFA 方法在跨断层水准资料中的应用研究[J].价值工程,2015,34(2):304-306(Liu Liwei,Li Ning,Shi Qi.Application of DFA Method in the Leveing Across-Fault Data[J].Value Engineering,2015,34(2):304-306)
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[13] 张永志,张克实.地壳孕震过程的重力变化研究[J].地壳形变与地震,2000,20(1):9-16(Zhang Yongzhi,Zhang Keshi.The Gravity Variation during the Breaking Process in Earth Crust[J].Crustal Deformation and Earthquake,2000,20(1):9-16)
[14] 褚庆忠,武泽,邵先杰,等.地震重力异常形成机理及其在地震预报中的作用[J].地震工程学报,2014,36(1):201-206(Chu Qingzhong,Wu Ze,Shao Xianjie,et al.Mechanism of Gravity Anomaly before Earthquake and Its Role in Earthquake Prediction[J].China Earthquake Engineering Journal,2014,36(1):201-206)
[15] 滕吉文,皮蛟龙,杨辉,等.汶川-映秀MS8.0地震的发震断裂带和形成的深层动力学响应[J].地球物理学报,2014,57(2):392-403(Teng Jiwen,Pi Jiaolong,Yang Hui,et al.Wenchuan-Yingxiu MS8.0 Earthquake Seismogenic Faults and Dynamic Response[J].Chinese J Geophys,2014,57(2):392-403)
[16] 滕吉文,司芗,王谦身,等.青藏高原地球科学研究中的核心问题与理念的厘定[J].地球物理学报,2015,58(1):103-124(Teng Jiwen,Si Xiang,Wang Qianshen,et al.Collation and Stipulation of the Core Science Problems and Theoretical Concept in the Geoscience Study on the Tibetan Plateau[J].Chinese J Geophys,2015,58(1):103-124)
[17] 赵凌强,詹艳,陈小斌,等.西秦岭造山带(中段)及其两侧地块深部结构特征[J].地球物理学报,2015,58(7):2 460-2 472(Zhao Lingqiang,Zhan Yan,Chen Xiaobin,et al.Deep Electrical Structure of the Central West Qinling Orogenic Belt and Blocks Its Either Side[J].Chinese J Geophys,2015,58(7):2 460-2 472)
[18] 詹艳,赵国泽,王继军,等.1927年古浪8级大震区及其周边地块的深部电性结构[J].地球物理学报,2008,51(2):511-520(Zhan Yan,Zhao Guoze,Wang Jijun,et al.Deep Electrical Structure beneath the Epicentre of the 1927 Gulang M8 Earthquake and Its Adjacent Areas from Magnetotelluric Sounding[J].Chinese J Geophys,2008,51(2):511-520)
[19] 祝意青,梁伟锋,郝明,等.青藏高原东北缘近期重力与地壳形变综合分析与研究[J].地震地质,2017,39(4):768-779(Zhu Yiqing,Liang Weifeng,Hao Ming,et al.The Comprehensive Analysis and Research of Recent Gravity and Crustal Deformation in Northeast Edge of the Tibetan Plateau[J].Seimology and Gology,2017,39(4):768-779)
[2] 祝意青,闻学泽,孙和平,等.2013年四川芦山MS7.0地震前的重力变化[J].地球物理学报,2013,56(6):1 887-1 894(Zhu Yiqing,Wen Xueze,Sun Heping,et al.Gravity Changes before the Lushan,M=7.0 Earthquake of 2013[J].Chinese J Geophys,2013,56(6):1 887-1 894)
[3] 石磊,贾晓东,陈石,等.2014云南鲁甸6.5级地震前重力变化特征与二维反演[J].地震地质,2014,36(4):1 217-1 227(Shi Lei,Jia Xiaodong,Chen Shi,et al.Greavity Changes before the Ludian,Yunnan,MS6.5 Earthquake of 2014 and the Three-Dimensional Inversion Research[J].Seimology and Geology,2014,36(4):1 217-1 227)
[4] 祝意青,赵云峰,李铁明,等.2013年甘肃岷县漳县6.6级地震前后重力场动态变化[J].地震地质,2014,36(3):667-676(Zhu Yiqing,Zhao Yunfeng,Li Tieming,et al.Dynamic Variation of Gravity Field before and after the Minxian-Zhangxian MS6.6 Earthquake on July 22,2013,Gansu,China[J].Seimology and Geology,2014,36(3):667-676)
[5] Eke A,Herman P,Kocsis L,et al.Fractal Characterization of Complexity in Temporal Physiological Signals[J].Physio Meas,2002,23(1):R1-R38
[6] Telesca L,Hattori K.Non-Uniform Scaling Behavior in Ultra-Low-Frequency (ULF) Earthquake-Related Geomagnetic Signals[J].Physica A:Statistical Mechanics and Its Applications,2007,384(2):522-528
[7] Telesca L,Balasco M,Lapenna V.Investigating the Time-Correlation Properties in Self-Potential Signals Recorded in a Seismic Area of Irpinia,Southern Italy[J].Chaos,Solitons & Fractals,2007,32(1):199-211
[8] Balasco M,Lapenna V,Romano G,et al.Extracting Quantitative Dynamics in Earth’s Apparent Resistivity Time Series by Using the Detrended Fluctuation Analysis[J].Physica A:Statistical Mechanics and Its Applications,2007,374(1):380-388
[9] 荣扬名,王桥,丁霞,等.2011年日本东北大地震特低频地磁信号的分形标度特征研究[J].地球物理学报,2012,55(11):3 709-3 717(Rong Yangming,Wang Qiao,Ding Xia,et al.Non-Uniform Scaling Behavior in Ultra-Low-Frequency(ULF) Geomagnetic Signals Possibly Associated with the 2011 M9.0 Tohoku Earthquake[J].Chinese J Geophys,2012,55(11):3 709-3 717)
[10] 刘立炜,李宁,史旗.DFA 方法在跨断层水准资料中的应用研究[J].价值工程,2015,34(2):304-306(Liu Liwei,Li Ning,Shi Qi.Application of DFA Method in the Leveing Across-Fault Data[J].Value Engineering,2015,34(2):304-306)
[11] Peng C K,Havlin S,Stanley H E,et al.Quantification of Scaling Exponents and Crossover Phenomena in Nonstationary Heartbeat Time Series[J].Chaos:An Interdisciplinary Journal of Nonlinear Science,1995,5(1):82-87
[12] 李鸿宇,袁桂平,王俊菲,等.2013年7月22日甘肃岷县-漳县6.6级地震地磁总场F空间相关异常分析[J].地震工程学报,2017,39(3):551-556(Li Hongyu,Yuan Guiping,Wang Junfei,et al.Analysis of Sptatial Correlation Anomaly in the Geomagnetic Total Field F Component during the Gansu Province Minxian-Zhangxian 6.6 Earthquake on July 22,2013[J].China Earthquake Engineering Journal,2017,39(3):551-556)
[13] 张永志,张克实.地壳孕震过程的重力变化研究[J].地壳形变与地震,2000,20(1):9-16(Zhang Yongzhi,Zhang Keshi.The Gravity Variation during the Breaking Process in Earth Crust[J].Crustal Deformation and Earthquake,2000,20(1):9-16)
[14] 褚庆忠,武泽,邵先杰,等.地震重力异常形成机理及其在地震预报中的作用[J].地震工程学报,2014,36(1):201-206(Chu Qingzhong,Wu Ze,Shao Xianjie,et al.Mechanism of Gravity Anomaly before Earthquake and Its Role in Earthquake Prediction[J].China Earthquake Engineering Journal,2014,36(1):201-206)
[15] 滕吉文,皮蛟龙,杨辉,等.汶川-映秀MS8.0地震的发震断裂带和形成的深层动力学响应[J].地球物理学报,2014,57(2):392-403(Teng Jiwen,Pi Jiaolong,Yang Hui,et al.Wenchuan-Yingxiu MS8.0 Earthquake Seismogenic Faults and Dynamic Response[J].Chinese J Geophys,2014,57(2):392-403)
[16] 滕吉文,司芗,王谦身,等.青藏高原地球科学研究中的核心问题与理念的厘定[J].地球物理学报,2015,58(1):103-124(Teng Jiwen,Si Xiang,Wang Qianshen,et al.Collation and Stipulation of the Core Science Problems and Theoretical Concept in the Geoscience Study on the Tibetan Plateau[J].Chinese J Geophys,2015,58(1):103-124)
[17] 赵凌强,詹艳,陈小斌,等.西秦岭造山带(中段)及其两侧地块深部结构特征[J].地球物理学报,2015,58(7):2 460-2 472(Zhao Lingqiang,Zhan Yan,Chen Xiaobin,et al.Deep Electrical Structure of the Central West Qinling Orogenic Belt and Blocks Its Either Side[J].Chinese J Geophys,2015,58(7):2 460-2 472)
[18] 詹艳,赵国泽,王继军,等.1927年古浪8级大震区及其周边地块的深部电性结构[J].地球物理学报,2008,51(2):511-520(Zhan Yan,Zhao Guoze,Wang Jijun,et al.Deep Electrical Structure beneath the Epicentre of the 1927 Gulang M8 Earthquake and Its Adjacent Areas from Magnetotelluric Sounding[J].Chinese J Geophys,2008,51(2):511-520)
[19] 祝意青,梁伟锋,郝明,等.青藏高原东北缘近期重力与地壳形变综合分析与研究[J].地震地质,2017,39(4):768-779(Zhu Yiqing,Liang Weifeng,Hao Ming,et al.The Comprehensive Analysis and Research of Recent Gravity and Crustal Deformation in Northeast Edge of the Tibetan Plateau[J].Seimology and Gology,2017,39(4):768-779)