Abstract

FUNWAVE-based Mapping Applications (FUNMAP) Applied to Model Tsunami from Manila Trench to Manila Bay, Philippines
Raquel Felix, Elaine Tan, Masashi Watanabe, Andrea Verolino, Puah Jun Yu and Adam Switzer

To bridge the gap between tsunami models and users, we developed two free offline applications, Input and Output FUNMAP apps. Built on the open-source FUNWAVE-TVD model, these user-friendly apps feature graphical interfaces with tooltips for guidance. The Input app sets up simulation files, generates and runs the FUNWAVE executable, and provides visual warnings to prevent errors. The Output app processes results to create wave height and current maps, as well as gauge plots, with outputs compatible with GIS and vector editing tools. We evaluated the apps using sample cases from the FUNWAVE-TVD model and through tsunami modelling in Manila Bay, Philippines. We examined how tsunamis sourced from the southern segment of the Manila Trench would propagate towards Manila Bay. We used a hypothetical Mw 8.8 earthquake rupture as the tsunami source and modelled the tsunami for 15 hours, utilizing up-to-date local bathymetry data for Manila Bay and the surrounding region in our simulation. Our findings indicate that the complex coastlines of Luzon (where Manila Bay is situated), Lubang, and Mindoro islands, along with the presence of a submarine canyon at the entrance of Manila Bay, have a major influence on the arrival of multiple waves that are higher than the initial wave entering the bay.