TSUNAMI DAMAGE ESTIMATION ALONG THE COAST OF LAOAG CITY USING TSUNAMI FRAGILITY FUNCTIONS
MEE17721
Bhenz RODRIGUEZ
Supervisor: Shunichi KOSHIMURA
Country: Philippines
The
objective of this study is to assess the tsunami hazard and to estimate the tsunami
damage in Laoag City. The scenarios used for
the assessment of tsunami were obtained from different studies of the Manila
Trench. For damage estimation, tsunami fragility functions developed for Banda
Aceh were used. The worst scenario S2 has a magnitude of Mw 8.4, with
a fault length of 277 km, a fault width of 91 km and a top depth of 5 km. The
slip amount was set to 3.72 m with strike, dip and rake angles of 20 degrees, 41 degrees and 79 degrees,
respectively. The maximum uplift and subsidence obtained for this scenario were
2.08 m and 0.25 m. The maximum tsunami height resulted on 4.47 m and the arrival
time to 20 min after the earthquake. Also, the inundation area and maximum
inundation depth values were 6.79 km2 and 6.8 m. The estimated
damage on exposed buildings and casualties were 93%, and 70%, respectively.
These findings can be used as a reference by local governments, however careful
assessment of uncertainties not considered here are necessary for future disaster
planning and mitigation.
Keywords: Tsunami simulations, Fragility Functions, Damage Estimation, Laoag
City.