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地震 ›› 2010, Vol. 30 ›› Issue (1): 61-72.

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汶川8.0级地震前地下流体长趋势变化特征讨论

陆明勇, 房宗绯, 赵丽葵   

  1. 中国地震应急搜救中心, 北京 100049
  • 收稿日期:2009-03-11 修回日期:2009-05-18 出版日期:2010-01-31 发布日期:2021-10-15
  • 作者简介:陆明勇(1965-), 男, 四川江油人, 研究员, 主要从事地球动力学、 地壳形变、 地下流体及地震预报等研究。
  • 基金资助:
    “十一五”国家科技支撑项目(2006BAC01B02-03-04; 2006BAC01B02-02-01)

Discussion on the Long-time Trend Change Characteristics of Subsurface Fluid before the Wenchuan MS8.0 Earthquake

LU Ming-yong, FANG Zong-fei, ZHAO Li-kui   

  1. China Center for Earthquake Disaster Emergency and SAR, Beijing 100049, China
  • Received:2009-03-11 Revised:2009-05-18 Online:2010-01-31 Published:2021-10-15

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摘要： 通过对汶川MS8.0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。

关键词: 地下流体, 地壳形变, 汶川MS8.0级地震, 长趋势变化机理

Abstract: Long-time observed data of Subsurface fluid from a wide circumferential region of the Wenchuan MS8.0 epicenter is analyzed before the earthquake. The result show that the subsurface fluids have long-time trend changes before the Wenchuan MS8.0 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 MS8.0 earthquake .

Key words: Subsurface fluid, Crustal deformation, Wenchuan MS8.0 earthquake, Long-time trend change mechanism

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