[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.7780/kjrs.2018.34.4.12

Subsidence Due to Groundwater Withdrawal in Kathmandu Basin Detected by Time-series PS-InSAR Analysis

Krishnan, P.V.Suresh (School of Earth and Environmental Sciences, Seoul National University)
Kim, Duk-jin (School of Earth and Environmental Sciences, Seoul National University)

Publication Information

Korean Journal of Remote Sensing / v.34, no.4, 2018 , pp. 703-708 More about this Journal

Abstract

In recent years, subsidence due to excessive groundwater withdrawal is a major problem in the Kathmandu Basin. In addition, on 25 April 2015, the basin experienced large crustal displacements caused by Mw 7.8 Gorkha earthquake. In this study, we applied StaMPS- Persistent Scatterer InSAR (StaMPS PS-InSAR) technique to estimate the spatio-temporal displacements in the basin after the mainshock. 34 Sentinel-1 C-band SAR data are used for measuring subsidence velocity during 2015-2017. We found the maximum subsidence velocity of about 9.02 cm/year and mean subsidence rate of about 8.06 cm/year in the line of sight direction, respectively, in the central part of the basin.

Keywords

Subsidence; Groundwater; Kathmandu; PS-InSAR;

Citations & Related Records

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