CAJ | 학술논문

通过对汶川M_S8.0地震震中周围地区震前地下流体长期观测资料的分析表明, 震前地下流体出现了长趋势变化, 其特征是时间早、范围广, 具有协调性以及向未来震中迁移等特征, 形态主要为趋势转折、破年变、加速等, 其中大多数为趋势转折变化. 进一步对比研究地壳形变、地下流体长趋势变化发现, 地壳形变和地下流体长趋势变化迁移特征一致, 地壳形变长趋势时间较早于地下流体长趋势变化时间, 形变出现张压变化与水位变化有比较密切的关系, 即形变大部分出现缓慢压性变化或张性减缓变化, 水位大部分出现缓慢上升或下降减缓变化. 最后讨论了地下流体长趋势变化机理.
통과대문천M_S8.0지진진중주위지구진전지하류체장기관측자료적분석표명, 진전지하류체출현료장추세변화, 기특정시시간조、범위엄, 구유협조성이급향미래진중천이등특정, 형태주요위추세전절、파년변、가속등, 기중대다수위추세전절변화. 진일보대비연구지각형변、 지하류체장추세변화발현, 지각형변화지하류체장추세변화천이특정일치, 지각형변장추세시간교조우지하류체장추세변화시간, 형변출현장압변화여수위변화유비교밀절적관계, 즉형변대부분출현완만압성변화혹장성감완변화, 수위대부분출현완만상승혹하강감완변화. 최후토론료지하류체장추세변화궤리.
Long-time observed data of Subsurface fluid from a wide circumferential region of the Wenchuan M_S8.0 epicenter is analyzed before the earthquake. The result show that the subsurface fluids have long-time trend changes before the Wenchuan M_S8.0 earthquake. The changes are characterized by earlier emerging time, wider range, compatibility and migration toward the epicenter etc. The shape of subsurface fluid long-time trend change is characterized by trend turn, annual variation damage and accelerating variation etc, mostly trend turns. Further comparative study with crustal deformation shows that the long-time trend change migration of subsurface fluid and crustal deformation is identical, and the long-time trend change time of crustal deformation is earlier than that of subsurface fluid. The tensor-pressure variation of crustal deformation is more closely related with the level variation of underground water, namely if the long-time trend change of crustal deformation is the majority variation shape of slow pressure or tensor diminution, then the long-time trend change shape of of underground water level is the majority variation shape of slow elevation or descending diminution. Finally, the productive mechanism on long-time trend change of subsurface fluid is discussed before Wenchuan M_S8.0 earthquake .