Improving Sub-Daily GPS Strain Estimates
Abstract
One of the foremost scientific objectives of global GPS-based geodetic measurements is the study of the strain field resulting from active plate boundary deformations across active plate boundary zones. Furthermore, observations of aseismic strain accumulation are required for advancing our understanding of the earthquake cycle, which is the main motivation for the establishment of GPS networks such as SCIGN, PBO and GEONET in Japan. Here, we present an improved GPS analysis strategy that enables us to reduce the noise level of GPS-based sub-daily strain measurements up to a factor of 10. This will allow the monitoring of sub-daily deformation, and provide exceptional spatial coverage for monitoring sub-daily strain deformation improved sub-daily resolution of positions and baseline estimates is maintained through GPS analysis approach, which reduces the key sources of error such as diurnal path effects, path delays caused by reflections and refractions of the GPS signal near the receiver (multipath), and the ionosphere and troposphere. We will present analysis of the resolution power of sub-daily baseline estimates as a function of baseline lengths and frequency.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFM.G41A0725R
- Keywords:
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- 1207 GEODESY AND GRAVITY / Transient deformation;
- 1240 GEODESY AND GRAVITY / Satellite geodesy: results