Mikrozonasi Multidisaster Daerah Sekitar Waduk Sermo Berbasis Analisis Keputusan Multikriteria Simple Addtive Weight (SAW) Berdasarkan Pengukuran Mikrotremor

Abstract

A study was conducted in the area around Sermo Dam based on micro-tremor measurement. This study was aimed to discover the microzonation of multi-disaster hazards which consisted of seismic and landslide in the area around Sermo Dam so that it can be used to support disaster risk reduction efforts. Data collection was performed using TDL 303S Seismograph on 26 measurement points with 500 m space within those points. Data from measurements were analyzed using Horizontal to Vertical Spectral Ration (HVSR) method to obtain dominant frequency and amplitude. Determination of landslide hazard, seismic hazard and multi-disaster hazard areas was based on Simple-Additive Weight (SAW) multi-criteria decision analysis with the following selected attributes: ground shear strain, seismic vulnerability index, ground acceleration, earthquake magnitude, geology and slope. Based on the result, the highest landslip vulnerability was in measurement point area 26 in eastern Klepu hamet (score = 0,882 to 0,99), highest seismic vulnerability with medium vulnerability in measurement point area 26 (score = 0,775 to 0,881). While the highest multi-disaster vulnerability was also in measurement point area 26 (score =12,25 to 16).