大地测量与地球动力学2011，Vol.31Issue(2)：38-43,6.
1999年集集地震前后台湾地区地应变率场的分布及其动力学成因
DISTRIBUTION OF STRAIN RATES IN TAIWAN BEFORE AND AFTER 1999 CHI-CHI EARTHQUAKE AND THEIR GEODYNAMIC MECHANISMS
摘要
Abstract
The destructive Chi-Chi earthquake occurred in 1999, which had a full impact on the stress state in Taiwan. The strain rates based on the GPS data before and after the 1999 Chi-Chi earthquake in the period of 1990 -1995 and of 2003 -2005 were estimated respectively. The computed results show that the pattern of strain rate distribution in Taiwan is not changed much before and after the Chi-Chi earthquake. The highest value of the maximum principle strain rates is located on the Coastal Range, which orientated obliquely to the trend of Taiwan. Deceasing rapidly from east to west, the values of principle compressive strain rates are less than those of extensive stnain rates on the Central Range, behaving on tensile strain state thex. And principle compressive strain rates are very small on rthe wcstern Coastal Plain. At 1he same time, the orientations nf primc iple strain rates are agreemcnt with those of P-and T-axis in focal mteehanisms itn Taiwan. Tihe high value of the maximunm shear strain tates is locared on the Coastal Range whene the snrfaee dilatation ratcs are negative, and the absolute value is highest in Taiwan. However sutrface dilatation rates are positive on both the norheem and southern sides of the Cereal Range.The computed results demonstrate that the Coastal Range is the cental collision zone between Taiwan and Luzon are, and material escapes toward two directions nf NE and SW. respectively, 1n the period of 2003 -2005, after 4 years since the Chi Chi earthquake, the maximum shear strain rates becomne much larger than those in the period of time before thc mainshock which may be resulted from the changcs of tihe physical properries of the medinm in tfocal regions, also suggesting thai the medium did not resnme to tihe state befnre the Chi-Chi earthquake.yet.关键词
GPS/应变率/动力成因/集集地震/台湾地区Key words
GPS/ strain rates: dynamhc mechanisms/ Chi-Chi earthquake/Taiwan aera分类
天文与地球科学引用本文复制引用
朱守彪,赵晓燕,刘杨,缪淼..1999年集集地震前后台湾地区地应变率场的分布及其动力学成因[J].大地测量与地球动力学,2011,31(2):38-43,6.基金项目
国家自然科学基金(40974020,40774024) （40974020,40774024）
北京市自然科学基金(8082024) （8082024）
中国地震局教师科研基金(20090103) （20090103）
地震动力学国家重点实验室基金(LED2008B02) （LED2008B02）
