Subsidence determination in the Central Valley, California
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Department of Civil and Geomatics Engineering, California State University, Fresno, 2320 E. San Ramon Avenue, MS/EE 94, Fresno, CA 93740, USA
Submission date: 2018-09-20
Acceptance date: 2018-12-20
Online publication date: 2018-12-31
Publication date: 2018-12-01
Reports on Geodesy and Geoinformatics 2018;106:35–42
Twenty four hour GNSS (Global Navigation Satellite System) data acquired monthly for 5 years from 8 CORS (Continuously Operating Reference Station) stations in Central Valley, California are processed and vertical velocities of the points are determined. To process GNSS data, online GNSS data processing service APPS (Automatic Precise Positioning Service) is used. GNSS data downloaded from NGS (National Geodetic Survey) CORS are analyzed and subsidence at these points is portrayed with graphics. It is revealed that elevation changes range from 5 mm uplift in the north to 163 mm subsidence in the southern part of the valley.
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