Solid Earth Science ESDR System
Abstract
The Solid Earth Science ESDR System (SESES) provides mature, long-term calibrated and validated Earth System Data Records (ESDRs) that support NASA's Earth Surface and Interiors (ESI) focus area, routinely processing data from Earthscope's Plate Boundary Observatory GPS network, NASA's Real-time Earthquake Analysis for Disaster Mitigation network (READI), as well as from several global GPS networks. The project, which was initiated in 2006, provides multi-decade calibrated and validated GPS-derived deformation time series and deformation vectors, based on daily GPS data. The time series are a unique product in terms of number of stations and duration (over 20 years), and have been modeled and catalogued for coseismic, postseismic and transient deformation, as well as instrumental offsets. Calibration and validation of the GPS measured deformation time series are done through a combined solution of two independently derived GPS position time series. Improved sensitivity to real signals is provided by a Principal Component Analysis tool that is routinely applied to the Western North America time series. At its current stage SESES is in the process of generating and distributing the following new ESDRs: (a) Troposphere delay time series for calibrating atmospheric delay errors in Interferometric Synthetic Aperture Radar (InSAR) that are one of the limiting InSAR error sources. (b) Precipitable Water Vapor (PWV) time series for use in Probable Maximum Precipitation studies, historical weather event analysis, and studies of long-term water vapor trends. (c) Fusion of GPS and seismic measurements at collocated stations to estimate three-dimensional high-rate displacement time series with mm precision, during significant historic seismic events (e.g., 2003 Mw 8.3 Tokachi-oki earthquake in Japan; 2010 Mw 7.2 El Mayor-Cucapah earthquake in northern Baja California; 2011 Mw 9.0 Tohoku-oki earthquake in Japan) and new events during the project duration. Data sets to be used in constructing the new and expanded ESDRs include GPS and other GNSS data as they become available from multiple regional and global networks; seismic data (from broadband seismometer and accelerometers) collected at or near (1-2 km) of a GPS station; surface pressure and temperature data from onsite sensors, nearby weather stations, and weather models. All ESDR's will be accessible through NASA's Crustal Dynamics Data and Information System (CDDIS), and will also be archived at the project's database at UCSD's Scripps Orbit and Permanent Array Center (SOPAC), where they would be accessible through the project's GPS Explorer (http://geoapp03.ucsd.edu/gridsphere/gridsphere) web portal.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFM.G23C..08K
- Keywords:
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- 1209 GEODESY AND GRAVITY Tectonic deformation;
- 1207 GEODESY AND GRAVITY Transient deformation;
- 7294 SEISMOLOGY Seismic instruments and networks;
- 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE