Publications

Fadly Usman^1*, Keisuke Murakami², Septiana Hariyani¹, Eddi Basuki Kurniawan¹ and Fadhilatus Shoimah¹
1. Department of Urban and Regional Planning, Universitas Brawijaya, Malang, INDONESIA
2.Department of Civil and Environmental Engineering, University of Miyazaki, JAPAN
*fadlypwk@ub.ac.id, fadlypwkftub@gmail.com

Abstract

The southern shore of the Java Sea is a coastal area that is directly opposite to the world’s primary fault,namely the Indo-Australian plate and Eurasian plate. This fault has often impacted plate shifts and earthquakes in shallow seas. Past earthquakes in the coastal areas of the South Sea shows a reasonably high intensity affecting the tsunami risk level of the cities on the southern shore of Java Island when an earthquake hits in the southern Java Sea. In this study, several technical approaches were taken to analyze the research area’s ability to mitigate the threat of tsunami disasters, namely numerical analysis using CADMAS Surf 2D and spatial analysis using ArcGIS. Numerical simulation results show that the wave height can reach 4 meters on the shoreline and drops dramatically to around 0.5 meters after friction occurs due to ground surface resistance and after it passes through the topography on the shore. Similarly, the wave velocity will drop significantly after passing through natural barriers such as topography and vegetation.

Keywords: Numerical simulation, spatial analysis, tsunami, coastal, CADMAS Surf 2D.

Disaster Advances, Vol. 12 (2) February (2019)

full journal: https://worldresearchjournal.com/disascurrissue.aspx

*Adi Susilo1, Sunaryo1, Fina Fitriah1 and Sarjiyana2
1Geophysics Engineering, Universitas Brawijaya, Indonesia;
2 Mechanical Engineering, State Polytechnic of Malang, Indonesia

*Corresponding Author, Received: 29 Sept. 2017, Revised: 26 Oct. 2017, Accepted: 30 Nov. 2017

ABSTRACT: A fault estimation has been done in Pohgajih village, Selorejo Subdistrict, Blitar, Indonesia using geoelectric resistivity, dipole-dipole configuration. The study was conducted using Resistivity meter OYO MacOHm. This study aims to analyze the existing fault track at the study site. The analysis of the fault is expected to provide information on the impact of the settlement of villagers in Pohgajih Village. The data acquisition is performed on five measurement tracks with a track length of 150 meters. Visual surveys show that in Pohgajih Village, there are points where people’s homes are fractured and severely damaged, and a slanted electric pole as the ground continues to move every year. Based on the interpretation of the resistivity data and the correlation with the visual survey results, the cracked and severely damaged house points were in the low resistivity range. The resistivity varies from 3.4 to 9.8 Ω.m and interpreted as clay. If traced based on the interpretation of resistivity data and visual surveys then it can be assumed that there is an additional fault, in addition to one track already contained on the geological map. The first fault corresponds to geological information based on the Blitar Sheet Geology Map. However, with the presence of severe damage dwellings at other locations, it is suspected that a second fault is located in the northern part of the first fault. Both faults lead from Northwest to Southeast and are suspected as strike slip fault.

Keywords: Geoelectric dipole-dipole, Pohgajih blitar, Fault, Hazard risk reduction

International Journal of GEOMATE, Jan., 2018 Vol.14, Issue 41, pp.111-118

Geotec., Const. Mat. & Env., ISSN:2186-2990, Japan, DOI: https://doi.org/10.21660/2018.41.87552