Dynamics of slow-moving landslides from permanent scatterer analysis

Science
George E HilleyFabio Rocca

Abstract

High-resolution interferometric synthetic aperture radar (InSAR) permanent scatterer data allow us to resolve the rates and variations in the rates of slow-moving landslides. Satellite-to-ground distances (range changes) on landslides increase at rates of 5 to 7 millimeters per year, indicating average downslope sliding velocities from 27 to 38 millimeters per year. Time-series analysis shows that displacement occurs mainly during the high-precipitation season; during the 1997-1998 El Niño event, rates of range change increased to as much as 11 millimeters per year. The observed nonlinear relationship of creep and precipitation rates suggests that increased pore fluid pressures within the shallow subsurface may initiate and accelerate these features. Changes in the slope of a hill resulting from increases in the pore pressure and lithostatic stress gradients may then lead to landslides.

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Citations

Aug 31, 2016·Proceedings of the National Academy of Sciences of the United States of America·Alexander L HandwergerGeorge E Hilley
Mar 11, 2020·Sensors·Adriaan L van NatijneThom A Bogaard
Feb 9, 2019·Scientific Reports·Alexander L HandwergerRoland Bürgmann
Apr 25, 2018·Proceedings of the National Academy of Sciences of the United States of America·Behrooz FerdowsiDouglas J Jerolmack
Mar 22, 2018·Earth's Future·Dalia Kirschbaum, Thomas Stanley

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