JDR Vol.4 No.6 pp. 489-497
doi: 10.20965/jdr.2009.p0489


Review of Recent Tsunami Observation by Offshore Cabled Observatory

Hiroyuki Matsumoto and Yoshiyuki Kaneda

Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima, Yokosuka 237-0061, Japan

July 22, 2009
October 5, 2009
December 1, 2009
tsunami, the 2006 Kuril Islands earthquake, the 2008 Off-Tokachi earthquake, offshore observatory, bottom pressure gauge
This paper discusses near- and far-field tsunami observations at the Hokkaido, Japan, offshore cabled observatory, focusing on the 2006 Kuril Island earthquake (Mw 8.3) as a far-field event and the 2008 off-Tokachi earthquake (Mw 6.8) as a near-field event. The Kuril Islands earthquake was detected as a series of tsunami signals by 2 bottom pressure gauges roughly 1 hour after the earthquake. Tsunami amplitudes observed offshore were 3 cm and off-coastal amplitudes were a few tens of centimeters. In the 2008 near-field off-Tokachi earthquake (Mw 6.8), a tsunami signal was detected simultaneously with the earthquake, which had a source amplitude of 4 cm. Our tsunami calculation reproduced the first wave well, but discrepancies about arrival time and amplitude arose for the second and later waves. Offshore tsunami sensors such as bottom pressure gauges, deep-ocean assessment and reporting of tsunami (DART) buoys, and kinematic global positioning system (GPS) buoys may thus become keys in early tsunami warning once appropriate dataset processing is implemented.
Cite this article as:
H. Matsumoto and Y. Kaneda, “Review of Recent Tsunami Observation by Offshore Cabled Observatory,” J. Disaster Res., Vol.4 No.6, pp. 489-497, 2009.
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