Subsidence-Derived Volumetric Strain Models for Mapping Extensional Fissures and Constraining Rock Mechanical Properties in the San Joaquin Valley, California

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dc.contributor.authorCarlson, Graceen
dc.contributor.authorShirzaei, Manoochehren
dc.contributor.authorOjha, Chandrakantaen
dc.contributor.authorWerth, Susannaen
dc.contributor.departmentGeosciencesen
dc.date.accessioned2020-12-11T13:21:26Zen
dc.date.available2020-12-11T13:21:26Zen
dc.date.issued2020-09en
dc.description.abstractLarge-scale subsidence due to aquifer-overdraft is an ongoing hazard in the San Joaquin Valley. Subsidence continues to cause damage to infrastructure and increases the risk of extensional fissures.Here, we use InSAR-derived vertical land motion (VLM) to model the volumetric strain rate due to groundwater storage change during the 2007-2010 drought in the San Joaquin Valley, Central Valley, California. We then use this volumetric strain rate model to calculate surface tensile stress in order to predict regions that are at the highest risk for hazardous tensile surface fissures. We find a maximum volumetric strain rate of -232 microstrain/yr at a depth of 0 to 200 m in Tulare and Kings County, California. The highest risk of tensile fissure development occurs at the periphery of the largest subsiding zones, particularly in Tulare County and Merced County. Finally, we assume that subsidence is likely due to aquifer pressure change, which is calculated using groundwater level changes observed at 300 wells during this drought. We combine pressure data from selected wells with our volumetric strain maps to estimate the quasi-static bulk modulus, K, a poroelastic parameter applicable when pressure change within the aquifer is inducing volumetric strain. This parameter is reflective of a slow deformation process and is one to two orders of magnitude lower than typical values for the bulk modulus found using seismic velocity data. The results of this study highlight the importance of large-scale, high-resolution VLM measurements in evaluating aquifer system dynamics, hazards associated with overdraft, and in estimating important poroelastic parameters.en
dc.description.notesThe National Aeronautics and Space Administration Grant NNX17AD98G supported G. C., M. S., C. O., and S. W.en
dc.description.sponsorshipNational Aeronautics and Space AdministrationNational Aeronautics & Space Administration (NASA) [NNX17AD98G]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1029/2020JB019980en
dc.identifier.eissn2169-9356en
dc.identifier.issn2169-9313en
dc.identifier.issue9en
dc.identifier.othere2020JB019980en
dc.identifier.pmid33042724en
dc.identifier.urihttp://hdl.handle.net/10919/101083en
dc.identifier.volume125en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleSubsidence-Derived Volumetric Strain Models for Mapping Extensional Fissures and Constraining Rock Mechanical Properties in the San Joaquin Valley, Californiaen
dc.title.serialJournal of Geophysical Research-Solid Earthen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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