川滇地区地壳水平运动与变形场的演化特征及其机制讨论
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摘要
通过对川滇地区近年来的GPS资料的处理和分析,确定以1999～2004年的3期资料为基础获取相对于区域无旋转基准的背景性运动场,并以此为基本约束,利用2005年和2007年的资料分别获取不同时段的偏离位移场。综合运动场与位移场结果并借助连续应变模型分析了水平形变场的主要特征,得到如下结果:川滇菱形块体的东边界带是该区的主要形变带,菱形块体及以西的地域表现为明显的顺时针旋转形变运动。2004年12月26日印尼苏门答腊巨震的同震影响波及到川滇地区,导致该区中、南部产生SSW向偏离位移,北部产生NW向偏离位移,对汶川地震的发生可能有正影响作用。
Sichuan-Yunnan is the most prominent area in China for its ctrustal movement and deformation,so it becomes an indispensable aspect to realize its basic characteristic and dynamic change among a lot of research subjects in geology.Through processing and analyzing almost all the GPS data in this area in recent years,we obtain the background movement field relative to the data with no rotation based on 3 time period data from 1999 to 2004,and make it as the basic restriction to get respectively the departure displacement field of different period by using the data in 2005 and in 2007.Integrating the data in movement field and displacement field and using continuous strain model,we analyze the main characteristics of horizontal deformation field,and acquire results as follows:The main deformation region in Sichuan-Yunnan area is located in the east boundary of Sichuan-Yunnan Rhombic Block.The Block and the west region to it obviously revolved clockwise.The Indonesia earthquake on 26th December,2004 coseismicly affected Sichuan-Yunnan Area,and resulted in a departure displacement in SSW direction in the southern part and in NW direction in the northern part of Sichuan-Yunnan area.The Indonesia earthquake probably touched off the Wenchuan earthquake.
Sichuan-Yunnan is the most prominent area in China for its ctrustal movement and deformation,so it becomes an indispensable aspect to realize its basic characteristic and dynamic change among a lot of research subjects in geology.Through processing and analyzing almost all the GPS data in this area in recent years,we obtain the background movement field relative to the data with no rotation based on 3 time period data from 1999 to 2004,and make it as the basic restriction to get respectively the departure displacement field of different period by using the data in 2005 and in 2007.Integrating the data in movement field and displacement field and using continuous strain model,we analyze the main characteristics of horizontal deformation field,and acquire results as follows:The main deformation region in Sichuan-Yunnan area is located in the east boundary of Sichuan-Yunnan Rhombic Block.The Block and the west region to it obviously revolved clockwise.The Indonesia earthquake on 26th December,2004 coseismicly affected Sichuan-Yunnan Area,and resulted in a departure displacement in SSW direction in the southern part and in NW direction in the northern part of Sichuan-Yunnan area.The Indonesia earthquake probably touched off the Wenchuan earthquake.
引文
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皇甫岗,石绍先,苏有锦.2000.20世纪云南地区地震活动研究[J].地震研究,23(1):1-9.
李齐,陈文寄,万景林,等.2000.哀牢山—红河剪切带构造抬升和运动形式转换时间的新证据[J].中国科学(D辑),30(6):576-583.
宋方敏,汪一鹏,沈军.1997.小江断裂带中段盆地的发育阶段及其与区域构造运动的关系[J].地震地质,19(3):211-219.
苏有锦,秦嘉政.2001.川滇地区强地震活动区与区域新构造运动的关系[J].中国地震,17(1):24-34.
沈军,汪一鹏,宋方敏,等.1997.小江断裂带中段的北东向断裂与断块结构[J].地震地质,19(3):203-210.
王晋南,王华林.1998.云南活动性断裂带的结构变异与孕震体构造的空间关系[J].地震研究,21(3):268-276.
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.
谢富仁,苏刚,崔效锋,等.2001.滇西南地区现代构造应力场分析[J].地震学报,23(1):17-23.
杨国华,江在森,武艳强,等.2005.中国大陆整体无净旋转基准及其应用[J].大地测量与地球动力学,25(4):6-10.
杨国华,江在森,张风霜,等.2007.昆仑山8.1级地震对川滇地区水平形变的影响[J].中国地震,23(1):56-64.
杨国华,王琪,王敏,等.2003.云南地区现今地壳水平运动与变性特征[J].大地测量与地球动力学,23(2):7-16.
Ta pponnier P,Molnar P.1977.Active faulting and tectonics in China[J].JGR,82:2905-2931.
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