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Abstract:
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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.
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