Tsunami Modeling Scenarios triggered by Undersea Landslides: Case Study of the Southern Region of Java Yohana Noradika Maharani (a*), Ikhsan (b), Fauzi (b), Lysa Dora Ayu Nugraini (c), Mochammad Prahastomi Muttahari (d)
a) Environmental Engineering Department, Study Program of Disaster Management, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia
*)yohananm[at]upnyk.ac.id
b) Meteorological, Climatological, and Geophysical Agency, Indonesia
c) Geomatics Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia
d) Geological Engineering, Universitas Pembangunan Nasional Veteran Yogyakarta, Yogyakarta, Indonesia
Abstract
The research models the potential tsunami damage resulting from landslides under the sea in Yogyakarta^s southern region. Six undersea landslides have been found on the eastern side of Sunda, between Central Java and Sumba Island, according to bathrimetric data. The waters to the south of Java, Indonesia, are particularly susceptible to avalanche tsunami events because of the unstable underwater slopes along the southern coast of Java and its close proximity to coastal areas with high population densities. The Cornell Multi-grid Coupled Tsunami Model (COMCOT) will be utilized in this research for modeling tsunami scenarios brought on by undersea landslides. A simulation of the propagation and run-up of tsunamis using bathymetry, topography, survey data, and marine characteristics is conducted in the southern portion of the Yogyakarta Special portion. A map of tsunami scenarios from tectonic causes (earthquakes) and underwater landslides was created by calculating the height and distance of tsunami inundation for landslide scenarios using different dimensions and volumes. According to the results of the tsunami modeling, the tsunami at Samas Beach in Sanden District achieved a height of 10.85 meters along the coast, with a submergence reach of 1.96 kilometers. On the Depok - Kretek District chain, the tsunami achieves a height of 8 meters, with a soaking range of 1.59 kilometers. Understanding the nature of underwater landslides and their potential to cause tsunamis is crucial for developing early warning systems and disaster preparedness in the region.
