摘要
在野外实测工作基础上，统计归纳了天景山断裂带上的冲沟左旋错动资料，分析了各类冲沟形成年代，对断裂带晚第四纪以来的水平活动强度分时、分段进行了研究。结果表明，断裂带晚更新世以来的总体活动强度不大，但从时间和空间分析，各段活动差异比较明显，平均滑动速率为０２３～１６２ｍｍ／ａ。晚更新世早、中期，活动中心位于断裂带西段，平均速率为１４０ｍｍ／ａ。晚更新世晚期以来，活动中心东移到中段，平均速率为１３０～１６２ｍｍ／ａ。
On the basis of counting and classifing the data of the gullies offset along Tianjingshan fault zone got from the field survey and estimating the ages of three scale gullies,the strike slip rates along the fault zone,have been discussed in different time intervals and segments.The results suggest that the active severity along the fault zone in this paper is not strong,but the differences of the different time intervals and segments are clear since Epileistocene,of which the average rates range from 0 23mm/a to 1 62mm/a.The largest average rate is 1 40mm/a which was the location of the west segment of the fault zone in early and middle period of Epileistocene.Since later period of Epileistocene,the active central location of the fault zone has been removed to the middle segment and the range of the average slip rates from 1 30mm/a to 1 63mm/a.
出处
《中国地震》
CSCD
北大核心
1997年第1期35-42,共8页
Earthquake Research in China
基金
国家地震局合同制研究项目
关键词
天景山
断裂带
晚第四纪
滑动速率
活动强度
Ningxia, Tianjingshan fault zone, Late Quaternary, Slip rate in different time intervals and segments
