小江断裂带近场活动特征分析
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摘要
采用2009—2018年小江断裂带跨断层近场形变观测资料,通过应变参数最小二乘法求解该时间段内小江断裂带上不同区段最大剪应变率和面应变率近场结果并进行对比分析。结果显示小江断裂带上的最大剪应变率和面应变率在各区段存在较大差异性,最大剪应变速率变化范围为(1.03～4.10)×10~(-6)/a,面应变率变化范围为(-1.18～0.33)×10~(-6)/a。该断裂呈现出北段强剪切张性、中段弱剪切强挤压、南段强剪切兼挤压活动的分段活动特征,进一步分析得到该断裂中南段为应变积累区段,地震危险性高于其他区段。
The near-field deformation data of the faults from 2009 to 2018 were used to solve the results of maximum shear strain rate and surface strain rate of near-field in different sections in Xiaojiang fault zone by the least squares method of strain parameters.The results showthat the maximum shear strain rate and surface strain rate on the belt in Xiaojiang fault are different from each segment.In a whole,the maximum shear strain rate ranges from 1.03 × 10~(-6)/a to 4.10 × 10~(-6)/a as well as the surface strain rate are(-1.18～0.33) × 10~(-6)/a.The fault exhibits the segmental activity characteristics of the strong shearing ductility in the northern section,weak shearing in the middle section,strong shearing and squeezing activities in the southern section.Further analysis shows that the mid-south section of the fault is a strain accumulation section.The seismic hazard of the segment is higher than that of the other segments.
The near-field deformation data of the faults from 2009 to 2018 were used to solve the results of maximum shear strain rate and surface strain rate of near-field in different sections in Xiaojiang fault zone by the least squares method of strain parameters.The results showthat the maximum shear strain rate and surface strain rate on the belt in Xiaojiang fault are different from each segment.In a whole,the maximum shear strain rate ranges from 1.03 × 10~(-6)/a to 4.10 × 10~(-6)/a as well as the surface strain rate are(-1.18～0.33) × 10~(-6)/a.The fault exhibits the segmental activity characteristics of the strong shearing ductility in the northern section,weak shearing in the middle section,strong shearing and squeezing activities in the southern section.Further analysis shows that the mid-south section of the fault is a strain accumulation section.The seismic hazard of the segment is higher than that of the other segments.
引文
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江在森,丁平,王双绪,等.2001.中国西部大地形变监测与地震预测[M].北京:地震出版社,5-6.
阚荣举,张四昌,晏风桐.1977.我国西南地区现代构造应力场与现代构造活动特征的探讨[J].地球物理学报,20(2):96-109.
陆明勇,刘天海,黄宝森,等.2011.跨断层流动形变监测环境及监测技术探讨[J].大地测量与地球动力学,31(5):141-144.
施发奇,尤伟,付云文.2012.GPS资料揭示的小江断裂近期运动特征[J].地震研究,35(2):207-212.
宋方敏,汪一鹏,俞维贤.1998.中国活断层研究专辑---小江活动断裂带[M].北京:地震出版社.
宋剑,杨少敏,王伟,等.2016.安宁河-则木河-小江断裂带闭锁特征研究[J].大地测量与地球动力学,36(6):490-494.
王伶俐,王青华,张勇,等.2016.基于GPS的云南地区主要断裂带现今运动特征分析[J].防灾科技学院学报,18(1):1-8.
王琪,赖锡安,游新兆,等.1998.红河断裂的GPS监测与现代构造应力场[J].地壳形变与地震,18(2):49-56.
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魏文薪,江在森,武艳强,等.2012.小江断裂带的运动及应变积累特征研究[J].大地测量与地球动力学,32(2):11-15.
杨国华,王琪,王敏,等.2003.云南地区现今地壳水平运动与变形特征[J].大地测量学与地球动力学,23(2):7-14.
岳彩亚,党亚民,杨强,等.2017.川滇地区次级地块及其主要断裂带现今活动研究[J].大地测量与地球动力学,37(2):176-181.
朱爽,杨国华,刘辛中,等.2017.川滇地区近期地壳变形动态特征研究[J].武汉大学学报(信息科学版),42(12):1765-1772.
Hong M,Shao D S,Wu T F,et al.2018.Short-Impending Earthquake A-nomaly Index Extracting of GNSS Continuous Observation Data in Yunnan,Southwestern China[J].Journal of Earth Science,29(1):230-236.