滇西区域水准观测的负位错反演与应变积累分析
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
利用1981~2006年滇西地区5个时段的区域水准观测资料,借助负位错模型反演,参考典型大震应力触发计算及跨断层等形变观测结果,研究了活动块体边界断裂应变积累的状况、分段差异性、时空演变及其与强震孕育—发生过程的关系。结果表明,该区6级以上地震多发生在断裂强锁定段或锁定程度显著加强段及其附近;目前宾川—南华以南、南涧以北,洱源、丽江一带可能反映相对较高的应变能积累背景,南定河断裂附近反映一定程度的应变积累特性。
We used negative dislocation model to inverse the 1981~2006 regional level observation data of West Yunnan on the basis of the stress triggering computation and across-fault observation data,thus studying the strain accumulation status and difference of the tectonic blocks' boundary faults,the time-space evolution and the relationship with the process of the development and occurrence of strong earthquakes.The result shows:(1)in this area,most earthquakes with magnitude over 6 occurred on the locked segments or obviously enhanced locked segments of the blocks' boundary faults and nearby;(2)presently the region south of Binchuan-Nanhua and north of Nanjian and the region from Eryuan to Lijiang reveal the background of obvious strain accumulation,while around the Nandinghe fault appears the strain accumulation to some degree.
引文
陈化然,李轶群,马宏生,等.2003.基于断层相互作用理论的强震成组孕育发生初步研究[J].地震,23(3):51-56.
    何玉梅,姚振兴.2002.中国台湾南部及其周边岛屿现今地壳形变的位错模型[J].地球物理学报,45(5):638-645.
    李延兴,黄诚,胡新康,等.2001.板内块体的刚性弹塑性运动模型与中国大陆主要块体的应变状态[J].地震学报,23(6):565-572.
    伍吉仓,陈永奇.2000.一种板块边界断层运动的力学模型[J].地壳形变与地震,20(2):8-14.
    万永革,吴忠良,周公威,等.2000.几次复杂地震中不同破裂事件之间的“应力触发”问题[J].地震学报,22(6):568-576.
    徐扬,菊地正幸,苏有锦.1998.1996年2月3日云南丽江地震震源过程的体波反演[J].地震学报,20(2):113-117.
    张四新,张晓亮,程宏宾.2005.滇西地区现今垂直形变演化特征[J].地震研究,28(3):268-273.
    张希,江在森,王琪,等.2003.川滇地区地壳水平运动特征与强震关系研究[J].大地测量与地球动力学,23(3):35-41.
    张希,张四新,王双绪.2004.昆仑山口西8.1级地震前后地壳垂直运动的负位错模型[J].地震研究,27(2):153-158.
    张希,张四新,王双绪,等.2005a.北祁连—河西地区强震地点预测[J].大地测量与地球动力学,25(1):40-46.
    张希,江在森,王双绪,等.2005b.川滇地区地壳水平运动的弹性块体边界负位错模型与强震地点预测[J].地震研究,28(2):119-124.
    Matsu ura M,Jackson D D and Cheng A.1986.Dislocation model foraseismic crustal deformation at Hollister,California[J].JGR,91(B12):12661-12674.
    Okada Y.1985.Surface deformation due to shear and tensile faults in ahalf-space[J].BSSA,75(4):1135-1154.
    Okada Y.1992.Internal deformation due to shear and tensile faults in ahalf-space[J].BSSA,82(2):1018-1040.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心