预滑震相还是气象影响?--与“汶川M_(W)7.9地震前华北和东北亚地块区的预滑活动”作者探讨  

Pre-slip activities or unidentifed meteorological driven factors?-discussion with the author on the“pre-slip activities before Wenchuan M_(W)7.9 earthquake at North China and Northeast Asia tectonic-block region”

作　　者：杨小林 YANG XiaoLin(Jinggangshan University,Ji'an 343009,China)

机构地区：[1]井冈山大学,吉安343009

出　　处：《地球物理学进展》2025年第1期48-53,共6页Progress in Geophysics

基　　金：国家自然科学基金(42104091,42104089)资助。

摘　　要：2008年4月18~22日期间,陕西省泾阳井水位观测到了约0.156 m的缓降变化,其持续时间约为4.5 d.论文“汶川M_(W)7.9地震前华北和东北亚地块区的预滑活动”,认为该信号为汶川M_(W)7.9地震前构造块体的预滑震相Xp2.为客观验证该推测的合理性,本研究结合气压观测数据,系统分析并揭示了泾阳井水位“Xp2震相”的真正动力源.结果表明,气压上升才是主因.该工作可以为一些Xp2震相成因的再考证提供参考.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 M_(W)7.9 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 M_(W)7.9 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.

关 键 词：汶川M_(W)7.9地震 预滑震相Xp2 构造块体 泾阳井 气压 井水位 

分 类 号：P315[天文地球—地震学]