Possible precursory anomalies in ground water level associated with the Wenchuan Ms 8.0 earthquake in 2008, Sichuan, China
Possible precursory anomalies in ground water level associated with the Wenchuan Ms 8.0 earthquake in 2008, Sichuan, China
复制标题
2008 年中国四川汶川 8.0 级地震可能导致地下水位异常
DOI：
10.1016/j.geog.2020.03.002
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发表时间：
2020-03-01
影响因子：
2.4
通讯作者：
Zhang, Hui
中科院分区：
文献类型：
--
作者：
Liu, Chenglong;Wang, Guangcai;Zhang, Hui
我们对2008年汶川8.0级地震前记录的中国四川省16口井的水位数据进行了检查，发现其中5口井的数据可能存在前兆异常，分别为德阳川08井、浦江川11井、泸州川13井、邛崃川22井和北川川22井。从时间上看，这些异常具有长、中、短期信号，主要分布在东北向的龙门山断裂带以及与之平行的华蓥山断裂带上。看来，华蓥山断裂带井位的变化意味着挤压，而龙门山断裂带的井位变化则体现了伸展。这些异常首先发生在汶川Ms8.0地震震中区以外的地区，然后迁移到发震断裂带。它们从西南方向向东北方向迁移，与主震的破裂过程一致。 (C) 2020年中国地震局地震研究所等由Elsevier B.V.代表科爱通讯股份有限公司制作并主办
We have examined the water level data from 16 wells in Sichuan province, China, recorded before the Wenchuan Ms8.0 earthquake occurred in 2008. We found that the data of 5 among these wells exhibit possible precursory anomalies, which are respectively named the Chuan No.08 well in Deyang, Chuan No.11 well in Pujiang, Chuan No.13 well in Luzhou, Chuan No.22 well in Qionglai and Beichuan. In time durations, these anomalies are of long-, intermediate- and short-term signals which are primarily distributed on the northeast (NE) trending Longmenshan fault zone as well as the parallel Huayingshan fault zone. It seems that the variations of the well levels on the Huayingshan fault zone imply compression while those on the Longmenshan fault zone reflect extension. These anomalies occurred first in the areas outside the epicenter region of the Wenchuan Ms8.0 earthquake, then migrated to the seismogenic fault zone. And they migrated from southwest to northeast in agreement with the rupture process of the main shock. (C) 2020 Institute of Seismology, China Earthquake Administration, etc. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.