汶川8.0级地震氡震后效应机理讨论  

Discussion on mechanism of the post-seismic effect of radon in the Wenchuan M_S 8.0 earthquake

作　　者：任宏微[1,2] 刘耀炜[1,2] 马玉川[1] 

机构地区：[1]中国地震局地壳应力研究所,北京市安宁庄路1号1000852 [2]中国地震局地下流体动力学实验室,北京市安宁庄路1号100085

出　　处：《中国地震》2010年第1期73-83,共11页Earthquake Research in China

基　　金："十一五"国家科技支撑项目"地震断裂带科学钻探(WFSD)--断裂带深部流体行为及其在地震过程中的作用"(WFSD-10)资助

摘　　要：在汶川地震氡震后效应特征的分析研究的基础上,对氡震后效应变化规律及机理展开了初步的探讨。按水氡阶变上升速度与恢复时间的长短,近场水氡震后效应可分为短期恢复型与长期不恢复型,远场水氡震后效应可分为短期恢复型与长期不恢复型。针对氡震后效应的4种变化规律,提出了4种可能的机理:破裂混合机理、破裂射气增大机理、振动射气增大机理、裂隙开启-闭合机理。研究氡震后效应变化规律及其机理,是从另一角度探讨氡的来源、迁移、表现与应力-应变、含水层动力学特征之间的关系,为氡地震前兆机理的研究与前兆异常判定提供一定的理论依据。The paper makes a research on the characteristic of post-effect of radon in the Wenchuan earthquake and the changing law and mechanism of the effect.According to the rising speed and recovery time,the post-seismic effect of water radon in near-field can be divided into short-term recovery type and the long-term non-recovery type.That in far-field can also be divided into these two types.Four mechanisms are proposed according to four changing laws of the postseismic effect of water radon：rupture mixing mechanism,rupture emanation mechanism,vibration emanation mechanism,and cracks opening-closing mechanism.The study of the changing law and mechanism of the post-earthquake effect of radon is a different approach for the relationship between the source,migration,performance of radon and stress-strain,aquifer dynamics,and provide some theoretical basis for the research on the mechanism of earthquake precursors of radon and the judgment of precursor anomalies of radon.

关 键 词：汶川地震 氡 震后效应 机理 

分 类 号：P315[天文地球—地震学]