Abstract Database

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
Abstractfulltext
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.