Mechanical Response of Shallow Crust to Groundwater Storage Variations: Inferences From Deformation and Seismic Observations in the Eastern Southern Alps, Italy
نویسندگان
چکیده
Changes in continental water storage generate vertical surface deformation, induce crustal stress perturbations, and modulate seismicity rates. However, the degree to which regional changes terrestrial content influence stresses occurrence of earthquakes remains an open problem. We show how groundwater storage, computed for a ?1,000 km2 basin, focus deformation narrow zone, causing large horizontal, nonseasonal displacements. present results from karstic mountain range located at edge Adria-Eurasia plate boundary system Northern Italy, where shortening is accommodated across active fold-and-thrust belt. The presence geological structures with high permeabilities deeply rooted hydrologically fractures fluxes pressure changes, generating transient horizontal displacements up 5 mm perturbations 25 kPa seismogenic depths. background rates appear correlated, without evident temporal delay, hydrological basin. With no evidence pore propagation fractures, modulation likely affected by direct on faults planes.
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ژورنال
عنوان ژورنال: Journal Of Geophysical Research: Solid Earth
سال: 2021
ISSN: ['2169-9356', '2169-9313']
DOI: https://doi.org/10.1029/2020jb020586