Characterization of Underwater Landslides in Krui Waters, Lampung using High-Resolution Seismic and Sonar Data Sri Ardhyastuti (a*), Muhamad Irfan (b), Eko Widi Santoso (a), Vijaya Isnaniawardhani (c), Purna Sulistya Putra (a), Teuku Yan Waliana Muda Iskandarsyah (c), Yudo Haryadi (a), Hardjo Pranoto (a), Adrin Tohari (a)
a) Research Center for Geological Disaster, National Research and Innovation Agency (BRIN), Jl. Cisitu, Sangkuriang Bandung, West Java - 40135,Indonesia
*sria005[at]brin.go.id
b) Research Center for Geospatial, National Research and Innovation Agency (BRIN), Jl. Raya Jakarta Bogor, Cibinong, West Java, Indonesia
c) Department of Geological Engineering, Padjadjaran University, Jatinangor, Kab.Sumedang - 45363, Indonesia
Abstract
Krui Waters, Lampung Indonesia is an area with disaster potential. Currently, the construction of underwater infrastructure is being developed, therefore it is necessary to study the characteristics of the seabed to support the engineering design. Imaging underwater conditions with a sonar system and sub bottom profiling (SBP) is an interesting research problem for geological disaster researchers. The phenomenon of underwater landslides is very important for disaster mitigation, both for tsunami prediction and underwater infrastructure development. This study aims to identify characteristics of underwater landslide phenomena around the Krui Waters, Lampung, Indonesia by using the analytical method of high-resolution imaging from sonar data with limited depth of penetration, and sub-bottom profilers (SBP). Underwater landslides phenomena in this area is still unknown in detail. All data obtained from RV Baruna Jaya IV in the 2020 survey. from the sonar data showing surface characteristics such as the presence of rocks (cobble and boulder), scarp, hummocky, furrows, and outcrop. SBP data displays the characteristics of the seabed in the form of a canyon with a slope more than 200 to the south and features avalanches. Finally, the morphological characteristics and features obtained could possibly be a potential sources for local tsunamis due to the hight slope, besides that it will be pouse hazard for underwater infrastructure development
