2006年9月秭归泄滩极微震群初步研究  

ON MINI-EARTHQUAKE SWARM OCCURRED IN SEPTEMBER,2006 IN XIETAN,ZIGUI COUNTY

作　　者：罗俊秋[1] 薛军蓉[1] 

机构地区：[1]中国地震局地震研究所,武汉430071

出　　处：《大地测量与地球动力学》2007年第F06期26-30,46,共6页Journal of Geodesy and Geodynamics

基　　金：科技部2004社会公益研究专项(2004DIB3J131)

摘　　要：2006年9月17-22日在秭归泄滩镇西侧发生了一次极微震群活动,其中最大地震为9月20日21时10分ML1.8级。分析结果表明：本次震群的震中主要集中于泄滩镇老石门村至老泄滩一线,震源深度为海平面以上0.5 km范围内,为正倾滑机制解;该震群频谱最佳频率主要集中在2 Hz左右,初步推断该震群为地表层重力作用下矿塌型地震并伴有几次浅层微滑坡。The mini-earthquake swarm occurred during Sep. 17 -22, 2006 in the west of Xietan town, Zigui county. The ML1.8 earthquake occurred at 21：10 of Sep. 20, 2006 was strongest one among them. The analysis of related data shows that the epicenters of this earthquake swarm are concentrated in the west of landslide broken belt along coal bed of Xiangxi stratum between old Shimen village and old Xietan town, the focal depth is within 0.5 km above sea-level, the main focal mechanism solutions are positive inclined-sliding; the best frequency of this earth-quake swarms amplitude spectrum is concentrated at 2 Hz,it can be concluded that this earthquake swarm is mine-collapsed earthquakes which is effected by the earth＇ s surface layer gravity, and this swarm includes several tiny landslides of shallow layer.

关 键 词：泄滩极微震群 地震波 波形特征 震源机制解 振幅谱 

分 类 号：P315.31[天文地球—地震学]