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Implications of ground-deformation measurements across earth fissures in subsidence areas in the southwestern USA

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Abstract

Ground deformation was monitored at earth fissures in areas of land subsidence induced by groundwater extraction in the southwestern United States. The ground deformation is consistent with the mechanism that fissures are caused by horizontal strains generated by bending of overburden in response to localized differential compaction. Subsidence profiles indicated that localized differential subsidence occurred across the fissures and that maximum convex-upward curvature was at the fissure. The overall shape of the profile stayed similar with time, and maximum curvature remained stationary at the fissure. Horizontal displacements were largest near the fissure, and generally were small to negligible away from the fissure. Maximum tensile horizontal strains were at the fissure and coincided with maximum curvature in the subsidence profiles. Horizontal tensile strain continued to accumulate at fissures after they formed with rates of opening ranging from 30 to 120 microstrain/year at fissures in Arizona.

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Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Implications of ground-deformation measurements across earth fissures in subsidence areas in the southwestern USA
Year Published 2010
Language English
Publisher International Association of Hydrological Sciences Press
Contributing office(s) Earthquake Science Center
Description 11 p.
Larger Work Type Conference Paper
Larger Work Title Eighth International Symposium on Land Subsidence
Conference Title Eighth International Symposium on Land Subsidence
Conference Location Querétaro, Mexico
Conference Date October 17-22, 2010
Country United States
Other Geospatial Fresno Valley, Cali, Las Vegas Valley, Nevada and Picacho Basin, Arizona
Online Only (Y/N) N
Additional Online Files (Y/N) N