
Pre-slip activities or unidentifed meteorological driven factors?—discussion with the author on the "pre-slip activities before Wenchuan MW7.9 earthquake at North China and Northeast Asia tectonic-block region"
XiaoLin YANG
Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 48-53.
Pre-slip activities or unidentifed meteorological driven factors?—discussion with the author on the "pre-slip activities before Wenchuan MW7.9 earthquake at North China and Northeast Asia tectonic-block region"
During the period of 18 to 22 April 2008, a visually slow drawdown in groundwater level signal with a magnitude of approximately 0.156 m lasting about 4.5 days was recorded in the Jingyang well, Shaanxi. The paper entitled "Pre-slip activities before Wenchuan MW7.9 earthquake at North China and Northeast Asia tectonic-block region" suggests that this episode originated from the pre-slip Xp2 phase of the tectonic block before the 2008 MW7.9 Wenchuan earthquake. However, the main signature of the "pre-slip Xp2 phase" is negatively correlated with the shape of low-frequency change of atmospheric pressure; therefore, we quantitatively investigated the pressure coefficient of the Jingyang well at low frequencies using the linear regression method. The final result indicated that the "pre-slip Xp2 phase" was mainly caused by a transient increase of atmospheric loading. This retrospective and reassessed study will help to reveal the real driving mechanism of the pre-slip Xp2 phase.
MW7.9 Wenchuan earthquake / Pre-slip Xp2 phase / Tectonic block / Jingyang well / Atmospheric pressure / Groundwater level in well
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Wang H, Zhang Y X, Liu J, et al. 2018. Pre-earthquake observations and their application in earthquake prediction in China: a review of historical and recent progress. //Ouzounov D, Pulinets S, Hattori K, et al eds. Pre-Earthquake Processes: A Multidisciplinary Approach to Earthquake Prediction Studies. Washington: American Geophysical Union, 19-39, doi: 10.1002/9781119156949.ch3.
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感谢审稿专家提出的修改意见和编辑部的大力支持!
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