Abstract
VCM by Integrating GPS, TG , SA and Geological Records
Track: GPS Technology
Authors: Nijaz Karacic, Randall Marshall, RPLS
Recently, observations of vertical crustal motion(VCM) from improved GPS network solutions and combined tide gauge(TG) and satellite altimetry(SA) solutions have become available. The determination of VCM at tide gauge locations relies on two observations, absolute and relative sea level change, obtained from satellite altimetry and tide gauge records, respectively. In addition, GPS vertical rates provide a direct measurement of vertical crustal motion. In this study, mostly subsidence, compaction and consolidation of sediments together with large-scale tectonic processes dominate the crustal motion signal. The re-analysis of tide gauge, GPS, and altimetry is required in order to determine local vertical motion and its change. The focus of the study is also to support local mechanisms like anthropogenic processes, sediment compaction and to satisfy the growing interest in measuring and identifying areas of significant and/or laterally changing VCM for natural hazard assessment. The different vertical motion rates are much more important to investigate in order to provide the needed information for future coastline erosion, flooding, and hazard due to relative sea level rise. The main objectives of this research is to investigate strategies of combining different approaches using networks and sub-networks of processed observations, localities, and temporal coverage. In addition, we emphasize new strategies of rigorously analyzing network coverage and network's strength. The GPS processing of a total of forty two (42) Permanent CORS Sites for all localities allow for the direct estimation of subsidence and enable the discrimination of locally varying rates which ultimately control coastal erosion and salt water inundation.