TSUNAMI INUNDATION MODELING ALONG THE EAST COAST OF SABAH, MALAYSIA FOR POTENTIAL EARTHQUAKES IN SULU SEA
MEE11623
Nur Intan Irzwanee Nurashid
Supervisor: Bunichiro SHIBAZAKI, Yushiro FUJII, Hideaki YANAGISAWA
Country: Malaysia
A tsunami numerical inundation modeling in the east
coast of Sabah was developed by considering large earthquakes along the Sulu
Trench as the tsunami source. The simulation was conducted using modified TUNAMI-N2
(Tohoku University’s Numerical Analysis Model for Investigation of Near Field
Tsunami, No. 2) with a nested grid system in spherical coordinate system. Nonlinear
shallow water theory with bottom friction with four different spatial grid
sizes was used in the computation. Three scenarios of different magnitudes, Mw
8.2, Mw 8.5 and Mw 8.8 were assumed. The results showed
that in Tambisan Island the first tsunami wave arrived 22.5 min after the
earthquake with maximum tsunami height of 8.6 m and tsunami run-up of 10.1 m in
Scenario 3 (Mw 8.8). In Sandakan, the first tsunami arrived 93 min
after the earthquake with maximum tsunami height of 3.8 m and tsunami run-up of
4.0 m in Scenario 3 (Mw 8.8). These results show that Tambisan
Island and Sandakan have a risk of tsunami threat from megathrust events along the
Sulu Trench.