Combined GPS/Acoustic Seafloor Geodetic Observation System for Monitoring Off-shore Active Seismic Regions Near Japan

摘要

We have been developing a system for detecting seafloor crustal movement by combining kinematic GPS and acoustic ranging techniques. A linear inversion method has been adopted to determine the position of seafloor stations from coordinates of a moving survey vessel and measured travel times of acoustic waves in seawater. The positioning accuracy is substantially improved by estimating the temporal variation of the acoustic velocity