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.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 48-53. DOI: 10.6038/pg2025II0235

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"

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Abstract

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.

Key words

MW7.9 Wenchuan earthquake / Pre-slip Xp2 phase / Tectonic block / Jingyang well / Atmospheric pressure / Groundwater level in well

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XiaoLin YANG. 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"[J]. Progress in Geophysics. 2025, 40(1): 48-53 https://doi.org/10.6038/pg2025II0235

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