HR: 0800h
AN: G51A-0148    [Abstracts]
TI: An analysis of kinematic GPS from a buoy during the event of September 5th, 2004 the Kii peninsula earthquake
AU: * Mohd Effendi, D
EM: effendi@seis.nagoya-u.ac.jp
AF: University Tun Hussein Onn of Malaysia, Locked Bag 101, Parit Raja, Batu Pahat, Johore, 86400, Malaysia
AU: * Mohd Effendi, D
EM: effendi@seis.nagoya-u.ac.jp
AF: Nagoya University, Furocho, Chikusaku, Nagoya, 464-8601, Japan
AU: Irwan, M
EM: irwan@seis.nagoya-u.ac.jp
AF: Nagoya University, Furocho, Chikusaku, Nagoya, 464-8601, Japan
AU: Kimata, F
EM: kimata@seis.nagoya-u.ac.jp
AF: Nagoya University, Furocho, Chikusaku, Nagoya, 464-8601, Japan
AU: Sagiya, T
EM: sagiya@seis.nagoya-u.ac.jp
AF: Nagoya University, Furocho, Chikusaku, Nagoya, 464-8601, Japan
AB: A tsunami due to the 2004 M7.4 September 5th earthquake off of the Kii peninsula, was recorded at the GPS buoy established about 13 km off of the Muroto Promontory, southwestern Japan. The buoy GPS data, differenced with that of a base station in Muroto, were used successfully to sense, in real-time, the tsunami waves as they went by at the point. The main challenge, now, is to detect tsunami with buoys placed much farther from shore, so as to give much earlier warning to the coastal populations likely to be affected. Long-baseline GPS solutions are intrinsically less precise than short-baseline ones. This is primarily because there are fewer satellites in the common view of the both the receiver and base station. To understand better how to get reliable and sensitive early tsunami detection, the GPS buoy data have been reprocessed with a precise, long-baseline differential GPS positioning technique, using dual-frequency carrier phase with floated ambiguities, implemented in the Bernese GPS software (BSW) version 5.0. In this paper, we also investigated the possible use of the kinematic GPS point positioning method in BSW. The GPS results shows excellent agreement with both the tidal record from a gauge near Muroto, where they arrived some 12 minutes later, and the predicted tsunami record based on preliminary source model. As indicated, GPS buoy relative to long-baseline land base may served as a powerful tool for monitoring tsunami as a part of the countermeasure for tsunami disaster mitigation.
DE: 1222 Ocean monitoring with geodetic techniques (1225, 1641, 3010, 4532, 4556, 4560, 6959)
SC: Geodesy [G]
MN: 2007 Fall Meeting