郯庐断裂带安徽段及“霍山窗”断层活动特征与地震关联性研究
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摘要
利用郯庐断裂带安徽段及"霍山窗"区域的跨断层水准测量资料,运用断层形变累积率及年滑动速率比方法计算各测线近20 a的观测数据,研究区域内断层活动及能量积累的整体空间演化特征,梳理各测点所跨断裂带的断层形变特征及变化过程,从空间分布和时间演化的角度探讨断层活动特征与安徽及邻近地区中强地震的关联性。结果显示:1)郯庐断裂带安徽段断层形变累积率总体高于"霍山窗"区域,震前存在高值聚集、区域分界、高密度低值梯度带等特征,显示震前的应力积累背景;2)安徽地区断层活动明显受郯庐断裂带整体活动的影响,区域性差异和阶段性变化显著;3)断层形变的年滑动速率比异常对地震活动的判断具有一定的指示作用,主要表现为震前2个月～1 a的高值异常及多个测点的群体性异常等特征,随着震级的增大,异常分布范围和变化幅度均有所增大。
We use the cross-fault deformation measurement data of Tan-Lu fault zone in Anhui section and "Huoshan seismic window", and calculate each line observation data for nearly 20 years utilizing the method of fault deformation accumulation rate and annual sliding velocity ratio. We analyze the fault activity, energy accumulation, and evolution characteristics of whole space in the study area, comb the various points across the fault deformation characteristics of the fault zone and the change process, and discuss the relation between fault activity and moderate earthquakes in Anhui province and adjacent areas from the angle of space distribution to the time evolution characteristics. Our results show that: 1) The cumulative rate of fault deformation in the Anhui section of the Tan-Lu fault zone is higher than that of the "Huoshan seismic window". Before the earthquake, there are high-value clusters, regional boundaries, high-density low-value gradient zones, etc., showing the background of stress accumulation before the earthquake. 2) The fault activity in Anhui area is obviously affected by the overall activity of the Tanlu fault zone, and the regional and periodic changes are significant.(3) The annual slip rate of fault deformation has a certain indication effect on the judgment of earthquake activity, mainly as before the earthquake. The characteristics of high-value anomalies of 2 months to 1 year, and group anomalies of multiple points, increase with increased magnitude.
We use the cross-fault deformation measurement data of Tan-Lu fault zone in Anhui section and "Huoshan seismic window", and calculate each line observation data for nearly 20 years utilizing the method of fault deformation accumulation rate and annual sliding velocity ratio. We analyze the fault activity, energy accumulation, and evolution characteristics of whole space in the study area, comb the various points across the fault deformation characteristics of the fault zone and the change process, and discuss the relation between fault activity and moderate earthquakes in Anhui province and adjacent areas from the angle of space distribution to the time evolution characteristics. Our results show that: 1) The cumulative rate of fault deformation in the Anhui section of the Tan-Lu fault zone is higher than that of the "Huoshan seismic window". Before the earthquake, there are high-value clusters, regional boundaries, high-density low-value gradient zones, etc., showing the background of stress accumulation before the earthquake. 2) The fault activity in Anhui area is obviously affected by the overall activity of the Tanlu fault zone, and the regional and periodic changes are significant.(3) The annual slip rate of fault deformation has a certain indication effect on the judgment of earthquake activity, mainly as before the earthquake. The characteristics of high-value anomalies of 2 months to 1 year, and group anomalies of multiple points, increase with increased magnitude.
引文
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[12] 王永安,李琼,刘强.跨断层形变累积率的变化特征与云南地区强震[J].地震研究,2011,34(2):136-142(Wang Yongan,Li Qiong,Liu Qiang.Variation of the Cumulative Rate of Cross-Fault Deformation and Strong Earthquakes in Yunnan[J].Journal of Seismological Research,2011,34(2):136-142)
[13] 李杰,朱成林,冯志军,等.年滑动速率比方法在跨断层形变资料分析中的应用[J].地震,2016,36(1):78-86(Li Jie,Zhu Chenglin,Feng Zhijun,et al.Analysis of Cross-Fault Deformation Data with Annual Sliding Velocity Ratio Method[J].Earthuake,2016,36(1):78-86)
[14] 刘东旺,夏瑞良,刘泽民,等.郯庐断裂带安徽段现代地震活动及应力场特征[J].地质科学,2006,41(2):278-290(Liu Dongwang,Xia Ruiliang,Liu Zemin,et al.Characteristics of Recent Seismicity and Stress Fields in Anhui Sector of the Tan-Lu Fault Zone[J].Chinese Journal of Geology,2006,41(2):278-290)
[2] 骆佳骥,周冬瑞,于书媛,等.郯庐断裂带(安徽段)活动特征及现代应力状态研究综述[J].防灾科技学院学报,2016,18(2):10-18(Luo Jiaji,Zhou Dongrui,Yu Shuyuan,et al.Review of Activity Characteristics and Regional Stress State of Tan-Lu Fault Zone ( Anhui Segment)[J].Journal of Institute of Disaster Prevention,2016,18(2):10-18)
[3] 郑颖平,翟洪涛,李光,等.郯庐断裂带江苏新沂-安徽宿松段地震危险性分析[J].华北地震科学,2012,30(2):48-51(Zheng Yingping,Zhai Hongtao,Li Guang,et al.Seismic Risk Analysis on Xinyi-Susong Fault Segment of the Tan-Lu Fault Zone[J].North China Earthquake Sciences,2012,30(2):48-51)
[4] 倪红玉,刘泽民,洪德全,等.“霍山窗”地区现代构造应力场研究[J].中国地震,2012,28(3):294-303(Ni Hongyu,Liu Zemin,Hong Dequan,et al.Study on Recent Tectonic Stress Field in the “Huoshan Seismic Window” Region [J].Earthquake Research in China,2012,28(3):294-303)
[5] 姚大全,张杰,沈小七.安徽霍山地区断层活动习性研究的新进展[J].地球物理学进展,2006,21(3):776-782(Yao Daquan,Zhang Jie,Shen Xiaoqi.New Advance of Fault Active Behavior Research in Huoshan Area,Anhui Province[J].Progress in Geophysics,2006,21(3):776-782)
[6] 陈宇卫,张军,庆梅,等.“霍山地震窗”小震序列运动学参数时变特征研究[J].地震,2007,27(1):26-32(Chen Yuwei ,Zhang Jun,Qing Mei,et al.Study on the Time-Varying Characteristics of Kinematic Parameters of Small Earthquake Sequence in “Huoshan Seismic Window” [J].Earthquake,2007,27(1):26-32)
[7] 肖伟鹏,袁泉.利用水准数据分析大别造山带东段构造活动特征[J].高原地震,2015,27(1):14-22(Xiao Weipeng,Yuan Quan.Analysis of Geotectonic Characteristics in Eastern Dabie Orogenic Belt Based on Leveling Data[J].Plateau Earthquake Research,2015,27(1):14-22)
[8] 李媛,刘希康,刘峡,等.跨断层“点-线-面”研究方法及在震例分析中的应用[J].地震,2017,37(2):106-114(Li Yuan,Liu Xikang,Liu Xia,et al.Cross-Fault Point-Line-Area Analysis Method and Its Application in Earthquake Case Study[J].Earthquake,2017,37(2):106-114)
[9] 陈兵,江在森,胡斌.断层形变趋势变化研究——垂直形变趋势累积DC值[J].地震地磁观测与研究,2000,21(1):50-55(Chen Bing,Jiang Zaisen,Hu Bin.Study of Trend Variation of Fault Deformation-Vertical Deformation Trend Accumulation Rate DC[J].Seismological and Geomagnetic Observation and Research,2000,21(1):50-55)
[10] 陈兵,江在森,赵振才.中国西部断层形变趋势异常特征与地震活动关系研究[J].中国地震,2000,16(1):77-85(Chen Bing,Jiang Zaisen,Zhao Zhencai.Study on the Trend Abnormal Features of Across-Fault Deformation and Seismicity in West China [J].Earthquake Research in China,2000,16(1):77-85)
[11] 赵振才,陈兵.青藏块体北缘跨断层测量资料宏观分析[J].中国地震,1996,12(4):358-366(Zhao Zhencai,Chen Bing.Macro-Analysis on Across-Fault Crustal Deformation Measurement Data along the North Edge of Qinghai-Xizang Block[J].Earthquake Research in China,1996,12(4):358-366)
[12] 王永安,李琼,刘强.跨断层形变累积率的变化特征与云南地区强震[J].地震研究,2011,34(2):136-142(Wang Yongan,Li Qiong,Liu Qiang.Variation of the Cumulative Rate of Cross-Fault Deformation and Strong Earthquakes in Yunnan[J].Journal of Seismological Research,2011,34(2):136-142)
[13] 李杰,朱成林,冯志军,等.年滑动速率比方法在跨断层形变资料分析中的应用[J].地震,2016,36(1):78-86(Li Jie,Zhu Chenglin,Feng Zhijun,et al.Analysis of Cross-Fault Deformation Data with Annual Sliding Velocity Ratio Method[J].Earthuake,2016,36(1):78-86)
[14] 刘东旺,夏瑞良,刘泽民,等.郯庐断裂带安徽段现代地震活动及应力场特征[J].地质科学,2006,41(2):278-290(Liu Dongwang,Xia Ruiliang,Liu Zemin,et al.Characteristics of Recent Seismicity and Stress Fields in Anhui Sector of the Tan-Lu Fault Zone[J].Chinese Journal of Geology,2006,41(2):278-290)