TSUNAMI HAZARD ASSESSMENT ALONG THE COAST OF LINGAYEN GULF, PANGASINAN, PHILIPPINES
Supervisor: Yushiro FUJII
We performed tsunami simulations for the Lingayen Gulf using the earthquake parameters of the two earthquake scenarios along the Manila Trench. The Case 1 earthquake scenario (M7.6) with a slip amount of 1.2 m produced smaller maximum wave height of 0.3 m and it arrived in about 1 hour in the inner bay of the Lingayen Gulf. The simulation results showed that Case 2 earthquake scenario (M8.4) with a slip amount of 3.7 m produced the maximum wave height of 1.6 m that arrived in about 1 hour in the inner bay of the Lingayen Gulf. The inundation computations showed that Case 1 produced a maximum height of 0.7 m and inundated approximately 0.13 km2 in a target area in Dagupan City while Case 2 produced a maximum height of 3 m and inundated approximately 0.70 km2 in the same area. The existing tsunami sensor (ASTI tide gauge station) is effective in the inner bay as it alarms the community of an impending tsunami in 30 min and 35 min in Cases 1 and 2, respectively, while it is ineffective in Bolinao coast because there will be a sudden tsunami arrival. Combining ASTI and JICA (proposed tsunami sensor project) tide gauge stations would advance to a better and robust tsunami early warning system in the Lingayen Gulf.