GSTDTAP  > 气候变化
DOI10.1029/2018GL080856
Strong Hydro-Related Localized Long-Period Crustal Deformation Observed in the Plate Boundary Observatory Borehole Strainmeters
Lu, Zhou1,2; Wen, Lianxing1,2,3
2018-12-16
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2018
卷号45期号:23页码:12856-12865
文章类型Article
语种英语
国家Peoples R China; USA
英文摘要

Strong localized hydro-related long-period strain variations, with amplitude up to about 2,000 ns (nanostrain) (1-2 orders of magnitude larger than the tidal deformation), are observed in some Plate Boundary Observatory borehole strainmeters in Parkfield and Anza, California. The long-period strain signals exhibit compression from December 2010 to January 2011, extension till May 2011, and compression till 2014 to 2015. The observed strain signals are accompanied by similar pore pressure change at some strainmeters and no pore pressure change at other strainmeters. Similar long-period signals are also observed in rainfall, groundwater, and soil moisture in the same regions. Poroelastic simulations suggest that the observed long-period strains and their relationships with rainfall and pore pressure could be explained by a rainfall-hydrological diffusion-poroelastic deformation mechanism. Our study indicates that poroelastic response to hydrological water would generate significant underground deformation, which is intimately related to local hydrological properties and settings.


Plain Language Summary Interaction between near-surface hydrological water and the solid Earth generates significant deformation in the shallow Earth. To better understand how hydrological process deforms the shallow Earth, we search hydro-related deformation recorded in the borehole strainmeters installed in Southern California and explore its physical mechanism. We observe a strong long-period (three to four years) underground deformation signal related to hydrological process at some strainmeter sites in Parkfield and Anza, California. The deformation signal exhibits compression from December 2010 to January 2011, extension till May 2011, and compression till 2014 to 2015. Similar long-period signals are also observed in rainfall, groundwater level, and soil moisture change in the same regions. At some sites with the deformation signal, similar pore pressure change is observed that correlates with the deformation signal in both time and shape, but no similar pore pressure change is also observed accompanying the deformation at other sites. These observations are explained well by a physical model in which surface hydrological water infiltrates into different depths and produces different pore pressure changes and strong hydro-related deformations, with those poroelastic responses intimately related to local hydrological properties and hydrological settings.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000454296600024
WOS关键词PORE-PRESSURE ; SEISMICITY ; FAULT ; SLIP
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/28145
专题气候变化
作者单位1.Univ Sci & Technol China, Lab Seismol & Phys Earths Interior, Hefei, Anhui, Peoples R China;
2.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Peoples R China;
3.SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA
推荐引用方式
GB/T 7714
Lu, Zhou,Wen, Lianxing. Strong Hydro-Related Localized Long-Period Crustal Deformation Observed in the Plate Boundary Observatory Borehole Strainmeters[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(23):12856-12865.
APA Lu, Zhou,&Wen, Lianxing.(2018).Strong Hydro-Related Localized Long-Period Crustal Deformation Observed in the Plate Boundary Observatory Borehole Strainmeters.GEOPHYSICAL RESEARCH LETTERS,45(23),12856-12865.
MLA Lu, Zhou,et al."Strong Hydro-Related Localized Long-Period Crustal Deformation Observed in the Plate Boundary Observatory Borehole Strainmeters".GEOPHYSICAL RESEARCH LETTERS 45.23(2018):12856-12865.
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