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We have developed an observation system for ocean bottom crustal deformation using an acoustic ranging-GPS link. A seafloor-positioning test at Suruga Bay revealed that our system can obtain the horizontal location of a sea-bottom station within 5 cm (95 % confidence interval) using accurate GPS positioning data. GPS positioning error is a major source of error in our whole system. We carried out experiments on kinematic GPS positioning with a long base line and a moving antenna to investigate its accuracy. The results of the experiments suggest that data with PDOP (Position Dilution of Precision) of 2 or less can reduce the GPS positioning error to 7 cm. The network of the observation system for ocean bottom crustal deformation may lead to advances in tectonic studies along subduction zones and contribute to predictions of interplate large earthquakes in the future.

chigaku zasshi/chigaku zasshi

Preparations for the Coming Large Earthquakes at the Nankai Trough. Development of an Observation System for Ocean Bottom Crustal Deformation Using an Acoustic Ranging-GPS Link.