汶川MS8.0地震破裂带土壤气中H2浓度时空变化  

Spatial-temporal Variations of H_2 Concentration in Soil Gas in the Seismic Fault Zone Produced by the Wenchuan M_S8.0 Earthquake

作　　者：周晓成[1] 石宏宇 陈超[2] 曾令华[2] 孙凤霞[1] 李静[3] 陈志[1] 吕超甲 黄丹[1] 杜建国[1] 

机构地区：[1]中国地震局地震预测重点实验室,中国地震局地震预测研究所,北京100036 [2]四川省地震局康定地震台,四川康定626000 [3]防灾科技学院,河北廊坊065201

出　　处：《地球科学进展》2017年第8期818-827,共10页Advances in Earth Science

基　　金：中国地震局地震预测研究所基本科研业务费“红河断裂带与小江断裂带交汇区温泉流体地球化学特征研究”(编号:2017IES010205);国家自然科学基金项目“鲜水河-小江活动断裂带CO2脱气研究”(编号:41673106)资助~~

摘　　要：断裂带H_2浓度变化能很好地反映断裂的活动性。通过对汶川MS8.0地震破裂带23个测区的土壤气H_2浓度测量,探讨破裂带土壤气H_2浓度时空变化与破裂带垂直位移与余震的关系。测量结果表明:(1)破裂带土壤气H_2主要来源与浅部气藏泄露直接相关;(2)破裂带土壤气H_2浓度平均值从映秀到南坝逐渐降低;(3)破裂带土壤气H_2浓度随着时间推移逐渐衰减。地震断裂带内H_2脱气进一步研究对大气环境研究具有重要意义。Degassing of Hydrogen （H2） from fault may be a good indicator of fault activity. The concentration of H2 in soil gas in the seismic surface rupture zone produced by the Wenchuan MS 8.0 earthquake was investigated in twenty three measuring regions in order to explore the relationship between the spatio-temporal variations of H2 concentration in soil gas along the seismic rupture zone and the vertical displacements and aftershocks activities. The results indicated： ① the sources of H2 were directly related to from the release of natural gas reservoirs; ②the average concentration of H2 in soil gas spatially decreased from Yingxiu to Nanba; ③the magnitudes of the H2 concentration anomalies declined significantly with time. It is very significant to study the variation tendency of atmospheric environment with further research of degassing of H2 from faults.

关 键 词：氢气 土壤气 破裂带 汶川地震 

分 类 号：P315.728[天文地球—地震学]