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Dwi Purwantoro Sasongko
Departemen Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro, Semarang
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Journal : INDONESIAN JOURNAL OF APPLIED PHYSICS

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Vibration Vulnerability Identification in Kota Lama Semarang using Microtremor Method Dwi Purwantoro Sasongko; Gatot Yuliyanto; Zaenal Arifin
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1191.536 KB) | DOI: 10.13057/ijap.v9i02.34592

Abstract

Kota Lama is one of the landmarks in Semarang Central Java that is located on young alluvial sediment. This area is prone to vibrations stemming from tectonic activities around Semarang. Therefore, measurements were carried out to identify this vibration vulnerability using the microtremor method. These were aimed at obtaining a spatial distribution of vibration vulnerability. There were 29 measurement points each separated by a sampling interval of 50 ms and a duration of 10 minutes.  Ground vibration amplification in this area was found to range from 0.74 to 4.9 with the highest being on the outskirts of Kota Lama. The predominant frequency was found to range from 0.02 to 1.1 Hz. These patterns of high predominant frequency and ground vibration amplification suggest that the central area of Kota Lama needs more attention. High ground shear strain that ranges from 0.02 to 0.86 means that possible event to occur in Kota Lama include landslide, soil compaction, and liquefaction, as is also evident with existing dynamic properties of repeated collapse effect and loading speed effect. Meanwhile, structure of vibration amplification against predominant frequency underneath Kota Lama revealed lateral subsurface discontinuity on its southwest side. It was also found that the contour of ground vibration amplification resembles the shape of Vifjhoek fort.
Co-Authors Aditya Yoga Syah Putra Agus Setyawan Asep Yoyo Wardaya Brandan Tito Ramadhan Budi Hendrarto Burhanudin Adman Fadilah . Fadilah . FX Adji Samekto Gatot Yulianto HARIADI SISWANTORO Hasti Wahyuni Hefni Effendi Ilmy Zaada Faidullah Imam Baru Raharjo Imas S. Sitanggang, Imas S. Imas Sukaesih Sitanggang Kurniawan Kurniawan M Munir Mohammad, Farid P Purwanto Prathika Andini Goesty Priyono Priyono R. M. Tofan Sastranegara S upriharyono S. Suripin Septian Adhi Nugroho Setia Budi Sasongko Sukirno Sukirno Supriharyono Supriharyono Surjono Hadi Sutjahjo Sutrisno Anggoro Tri Mulyaningsih Wahyu Setiabudi Zaenal Arifin