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作 者:苏有锦[1] 李永莉[1] 李忠华[1] 易桂喜[2] 刘丽芳[1]
机构地区:[1]云南省地震局,昆明650041 [2]四川省地震局,成都610041
出 处:《地震研究》2003年第z1期10-16,共7页Journal of Seismological Research
基 金:国家"十五"科技攻关项目 ( 2 0 0 1BA60 1B0 1-0 2 -0 2 ) .
摘 要:系统分析了川滇地区 1970~ 2 0 0 1年的区域地震目录 ,给出了川滇地区主要地震活动带 (区 )最小完整性震级的时、空分布。总体而言 ,对于川滇地区地震活动最强烈的 3个区域 ,地震目录的完整性最小震级可取如下震级 :(1)金沙江—红河断裂带及鲜水河—安宁河—小江断裂带所围限的川滇菱形地块 ,1970~ 1981年 2 5级 ,1982年以来 2 0级 ;(2 )金沙江—红河断裂带以西的滇西—滇西南腾冲—龙陵、澜沧—耿马、思普地区 ,1970~ 1981年 3 0级 ,1982年以来 2 5级 ;(3)阿坝区、松潘—龙门山带及名边—马山—昭通带 ,1970~ 1981年 2 5级 ,1982年以来 2 0级。The earthquake catalog compiled from 1970 to 2001 in Sichuan-Yunnan regi on is analyzed in this paper and the space-time distribution of minimum complete magnitude of earthquake catalog in main seismic belts (or zones) is given too. Generally speaking, for the following three zones with the strongest seismic act ivity in Sichuan-Yunnan region, the minimum magnitude of completeness in earthqu a ke catalog is got in different ways. Firstly, in Sichuan-Yunnan rhombic tectonic block enclosed by Jingshajiang-Honghe fault and Xianshuihe-Anninghe-Xiaojiang fault, the M 2 5 earthquakes from 1970 to 1981 and the M 2 0 earthquakes from 1982 to 2001 are adopted. Secondly, in Tengchong-Longli ng belt, Lanchang-Gengma belt and Simao-Puer belt which are located to the west of Jingshajiang-Honghe fault, the M 3 0 earthquakes from 1970 t o 1981 and M 2 5 earthquakes from 1982 to 2001 are adopted. Finally, in Aba region, Songpan-Longmenshan belt and Mingbian-Mashan -Zhaotong belt, the M 2 5 earthquakes from 1970 to 1981 and M 2 0 earthquakes from 1982 to 2001 are adopted.
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