地震工程学报2016，Vol.38Issue(2)：278-284,7.DOI:10.3969/j.issn.1000-0844.2016.02.0278
广义海原断裂带断层气地球化学特征与地震活动性关系对比研究
Geochemical Characteristics of Fault Gas along Generalized Haiyuan Fault Zone and Its Relation to Earthquakes
摘要
Abstract
The eastern section of the North Qilian fault zone lies on the northeastern edge of the Qinghai—Tibet Plateau uplift zone,which consists of the Jinqianghe fault,Laohushan fault,and Maomaoshan fault.The Haiyuan fault,located in the west of the Ordos Block,is a NW trending, large strike-slip fault.It has good continuity with the eastern segment of the North Qilian Moun-tain fault,and both exhibit left-type dislocation.Therefore,the eastern segment of the North Qil-ian Mountain fault and the narrow Haiyuan fault are collectively referred to as the generalized Haiyuan fault zone.Seismic activity is very strong in this area,where many MS≥7.0 earthquakes have occurred over time,such as the famous 1920 Haiyuan MS8.5 earthquake and the 1927 Gulang MS8.0 earthquake.Therefore,the region's seismic hazards should be carefully investigated.Based on the measurement results of the mercury and radon concentrations of 10 fault-gas profiles in the generalized Haiyuan fault zone,in this paper,we describe our detailed analysis of the spatial distri-bution characteristics of the mercury and radon concentrations in different segments and their o-verall distribution trend along the fault zone.Combined with the seismotectonic background and spatio-temporal evolution characteristics of large earthquakes,as well as the spatial distribution characteristics of the b-value,we studied the relationship between the spatial distribution charac-teristics of fault gas and the seismic risk of different segments in the generalized Haiyuan fault zone.The results show that the intensity of the fault-gas concentration in the fault zone exhibits obvious segmentation,and is also correlated to some degree with the seismic activity.Based on the above research,we made a pre-j udgment of the potential seismic risk in different segments of the generalized Haiyuan fault zone from the geochemistry perspective.This research can provide vital background information for earthquake prediction in the study area.关键词
广义海原断裂/断层气/地震活动性参数/强震危险性Key words
the generalized Haiyuan fault zone/fault gas/seismicity parameter/strong earth-quake risk分类
天文与地球科学引用本文复制引用
周慧玲,苏鹤军,张慧,李晨桦..广义海原断裂带断层气地球化学特征与地震活动性关系对比研究[J].地震工程学报,2016,38(2):278-284,7.基金项目
甘肃省自然科学基金项目（1308RJZA275）；中国地震局星火计划项目 （）
