STUDY ON TSUNAMI INUNDATION SIMULATION IN THE NORTHWESTERN COAST OF SABAH, MALAYSIA
MEE11624
Siti Nurhaida Basri
Supervisor: Yushiro FUJII, Bunichiro SHIBAZAKI, Hideaki YANAGISAWA
Country: Malaysia
Tsunami
simulations and inundation analyses are conducted on the northwestern coast of
Sabah by assuming earthquake along the Manila Trench (MT) proposed by Salcedo
(2010). TUNAMI (Tohoku University’s Numerical Analysis Model for
Inverstigation) code is used. To calculate tsunami propagation and inundation
we perform numerical simulations of linear and nonlinear shallow water wave
equations in a spherical coordinate system with four different spatial grid
sizes of 60, 20, 6.6667 and 2.2222 arc-sec. As output points, 24 tide gauge
stations are assumed along Kudat coastal areas. Seven scenarios with different
moment magnitudes are considered to perform tsunami simulations. Earthquake
source regions are divided into four segments, MT1, MT2, MT3, and MT4. Single
and multi segmentation are used to assess the scenario earthquakes for all
three target areas, Kudat Peninsula, Balambangan Island and Banggi Island. Computation
results show that the tsunami heights are larger with large slip on the fault. We
found that the slip on the segment MT1 is not sensitive for the tsunami height
to the coastal area of northwest Sabah. We also found that the most significant
tsunami is expected from MT4, as well as MT3 and MT2 cause large tsunamis.