HR: 0800h
AN: U11A-0820    [Abstracts]
TI: Tsunami Arrival Time in Sri Lanka for the 2004 Sumatra-Andaman Earthquake
AU: * Matsumoto, H
EM: hmatsumoto@jamstec.go.jp
AF: Japan Agency for Marine-Earth Science and Technology, 2-15, Natsushima, Yokosuka, 237-0061 Japan
AU: Inoue, S
EM: shusaku@enveng.titech.ac.jp
AF: Tokyo Institute of Technology, Dept. Built Environment 4259, Natatsuta, Midori-ku, Yokohama, 226-8502 Japan
AU: Wijeyewickrema, A
EM: anil@cv.titech.ac.jp
AF: Tokyo Institute of Technology, Dept. Civil Engineering 2-12-1 O-Okayama, Meguro-ku, Tokyo, 152-8552 Japan
AU: Sekiguchi, T
U11A-0820 AF: Tokyo Institute of Technology, Dept. Civil Engineering 2-12-1 O-Okayama, Meguro-ku, Tokyo, 152-8552 Japan
AU: Miura, H
EM: hmiura@enveng.titech.ac.jp
AF: Tokyo Institute of Technology, Dept. Built Environment 4259, Natatsuta, Midori-ku, Yokohama, 226-8502 Japan
AU: Gunaratna, P
U11A-0820 AF: University of Moratuwa, Dept. Civil Engineering Katubedda, Moratuwa, 603 Sri Lanka
AU: Madurapperuma, M
U11A-0820 AF: University of Moratuwa, Dept. Civil Engineering Katubedda, Moratuwa, 603 Sri Lanka
AU: Iwasaki, S
EM: cuh@bosai.go.jp
AF: National Research Institute for Earth Science and Disaster Prevention, 3-1, Tennodai, Tsukuba, 305-0006 Japan
AB: The Indian tsunami caused by the Sumatra-Andaman Islands earthquake of 26 December 2004 severely affected Sri Lanka, approximately 1500 km far west from the tsunami source. The post tsunami surveys in Sri Lanka by a combined team of Japanese and Sri Lankan researchers were carried out twice. The first one is from 29 December 2004 to 04 January 2005, covering the East, SE and South Sri Lanka including the cities of Moratuwa, Beruwala, Bentota, Seenigama, Hikkaduwa, Galle, Thalpe, Matara, Tangalla and Hambantota, and the second one is from 10 to 18 March 2005 covering the NE, East, SE and South Sri Lanka including Trincomalee, Batticaloa, Arugam Bay, Yala National Park and Kirinda. The main objective of the surveys is to obtain eyewitness information, in particular tsunami arrival time. Many other survey teams have completed with respect to the tsunami height measurements, therefore the survey of tsunami arrival times is needed in order to understand the tsunami quantitatively. In fact, no tide gauge station in Sri Lanka exists except for Colombo, hence eyewitness accounts by the local people are possibly basic information about the tsunami. After compiling two surveys, we could obtain some data of tsunami arrival times in addition to tsunami heights at the whole coast in Sri Lanka. The first wave arrived at 08:30 to 08:45 at the east coast, followed by the largest wave at 08:50 to 09:15. At most area at the east coast, the second wave was the largest. At the south and the west coasts, on the other hand, the first wave arrived at 09:15 to 09:45, and the largest wave arrived at 09:50 to 10:30, that were the second or the third wave. Thus eyewitness accounts indicated that there were one or two waves before the arrival of the largest tsunami. In some locations it was reported that the water receded several hundred meters before the largest wave arrived.
DE: 0468 Natural hazards
DE: 4564 Tsunamis and storm surges
SC: Union [U]
MN: Fall Meeting 2005