则邑断裂活动性与潜在震源区划分研究  

DISCUSSION ON THE ACTIVITY OF ZEYI FAULT AND DETERMINATION OF RELATED POTENTIAL SEISMIC SOURCE

作　　者：王珏[1,2] 陈宇军[1] 文雯[1] 庄儒新[1] 

机构地区：[1]云南省地震局,云南昆明650041 [2]北京大学地球与空间科学学院,北京100871

出　　处：《防灾减灾学报》2011年第3期72-80,共9页Journal of Disaster Prevention And Reduction

摘　　要：则邑断裂是滇中块体内部一条北西向的晚更新世活动断裂,通过对它的地质地貌调查、断裂活动性鉴定,结合地震活动性资料,确认其为1985年4月18日禄劝6.2级地震的发震构造。据此作为识别潜在震源区的标志,划分了则邑潜在震源区,同时充分考虑了小震活动密集条带和余震的分布范围,由此确定了潜源的位置、边界和震级上限。则邑潜在震源区的划分是对滇中地区潜在震源划分方案的补充;作为实例也对重大工程场地地震安全性评价工作中对场地有重要影响的潜在震源区细化工作具有一定的参考意义。Lying on the midland block of Yunnan internally, Zeyi fault is a Q3 active fault, which bearing is north west direetion. Based on field geological and geomorphological investigation and identification of fault activity, as well as the data of seismicity, this papper validates that Zeyi fault is the seismogenie structure of the Ms6.2 Luquan earthquake in 1985. So as to offer an insight into the seismotectonic indicator for delineation of Zeyi potential seismic source. And its determination of the location, upper-bound magnitude and the boundaries have been discussed, with attentively considering the belt of intensive small earthquakes and the distribution of aftershocks. The new Zeyi potential seismic source is a supplement to delineation potential seismic sources in the midland block of Yunnan. As an example, this work will be valuable for the detailed researches of seismic tendency in the seismic safety evaluation of important engineering.

关 键 词：则邑断裂 活动性 潜在震源区 

分 类 号：P315.5[天文地球—地震学]