Abstract Database


Dandy N. Camero
Supervisor: Bunichiro Shibazaki, Yushiro Fujii
Country: Philippines

We performed tsunami numerical simulations to assess the tsunami hazard along the coast of Eastern Visayas region that may be generated from the Philippine trench subduction zone. The maximum credible case (M7.9) of the Philippine trench segment near the coast of Eastern Samar was one of the scenario simulated. An apparent seismic gap was observed in this segment where no large earthquakes occurred in the last 400 years. We also modeled tsunami caused by the 2012 intraplate earthquake (M7.6) occurred on the East coast of Guiuan, Eastern Samar province that produced a small amplitude of tsunami. The generated maximum uplift and subsidence for the maximum credible scenario were 1.06m and 0.26m while those for the 2012 event were 0.53m and 0.04m. The earliest tsunami arrival times from the maximum credible scenario were within 2 minutes while those from the 2012 Samar earthquake model were within 5 minutes. Both were observed at Guiuan station. The Guiuan station registered the maximum tsunami height of 2.3m for the maximum credible scenario while 1.1m was observed for the 2012 Samar earthquake model. Tsunami inundation modeling was performed using GEBCO 30-arc second bathymetry data and SRTM_v2 3-arcsec topographic data for six coastal municipalities and one city. In the tsunami inundation modeling, the maximum credible scenario registered the maximum inundation height of 2.7m observed at the water gauge situated in the municipality of Gen. Mc Arthur.


Keywords: Tsunami Numerical Simulations, Tsunami Hazard, Philippine Trench, Eastern Visayas, Eastern Samar