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All Journal Jurnal RISET Geologi dan Pertambangan Jurnal Meteorologi Klimatologi dan Geofisika Jurnal Ilmu dan Inovasi Fisika
Erlangga Ibrahim Fattah
Teknik Geofisika Institut Teknologi Sumatera
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Mathematics Physics

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ANALISIS PERGERAKAN DAN AKUMULASI COULOMB STRESS GEMPA UTAMA LOMBOK SELAMA TAHUN 2018 DAN PENGARUHNYA TERHADAP AKTIVITAS GUNUNG RINJANI Lasroha Marulitua Panjaitan; Erlangga Ibrahim Fattah; Cahli Suhendi; Rizki Wulandari; Hana Yudi Perkasa
Jurnal Meteorologi Klimatologi dan Geofisika Vol 7 No 1 (2020): Jurnal Meteorologi Klimatologi dan Geofisika
Publisher : Unit Penelitian dan Pengabdian Masyarakat Sekolah Tinggi Meteorologi Klimatologi dan Geofisika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36754/jmkg.v7i1.215

Abstract

Mechanically, earthquakes can be triggered by changes in static and dynamic stress. In terms of static stress change, it occurs when earthquake energy is released which then changes the stress conditions around the fault (for example at the end of the fault). The process of changing static stress in an area will cause seismic activity to occur in the surrounding area and in other areas with a great distance. The amount of change in Coulomb Failure stress (∆CFS) is quantifiable and has proven to be a powerful tool in explaining the movement and accumulation of stress caused by the mainshock and its aftershock. This study was conducted to calculate the distribution of stress changes due to the main Lombok earthquake (Mw≥6) during 2018 and its effect on Mount Rinjani activity, using the Coulomb 3.3 software. The earthquake data used were taken from the earthquake catalog of Global Centroid Moment Tensor (GCMT), International Seismological Center (ISC) and United States Geological Survey (USGS). The lateral difference in the value of ∆CFS shows the movement of energy from the main earthquake that triggered another earthquake as shown by the aftershock data. The results of this analysis of the movement and accumulation of ∆CFS will be used to identify the correlation with the activity of Mount Rinjani.
MIKROZONASI SEISMIK WILAYAH PADALARANG, KABUPATEN BANDUNG BARAT MENGGUNAKAN METODE HORIZONTAL TO VERTICAL SPECTRAL RATIO (HVSR) Gabrio Hikma Januarta; Tedi Yudistira; Adrin Tohari; Erlangga Ibrahim Fattah
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 30, No 2 (2020)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/risetgeotam2020.v30.1087

Abstract

Dalam kurun waktu lima tahun terakhir terjadi peningkatan aktivitas tektonik di wilayah selatan Pulau Jawa. Salah satu sesar aktif di wilayah Jawa Barat yaitu Sesar Cimandiri dan Sesar Lembang. Sesar Cimandiri berarah barat daya-timur laut, sedangkan Sesar Lembang berarah timur-barat. Melalui citra satelit DEM (Digital Elevation Model) pertemuan kedua sesar diduga berada di wilayah Padalarang, Kabupaten Bandung Barat. Keberadaan infrastruktur penghubung kota seperti jalan tol, rel kereta api serta permukiman penduduk yang padat menjadikan daerah tersebut merupakan daerah yang berpotensi mengalami kerusakaan saat terjadi gempa bumi. Dalam upaya mitigasi diperlukan studi mikrozonasi untuk mengetahui karakteristik  tanah. Metode Horizontal to Vertical Spectral Ratio (HViSR) digunakan untuk mengestimasi nilai frekuensi dominan (f0) dan faktor amplifikasi (A0) daerah setempat dari data pengukuran mikrotremor. Dari 42 titik pengukuran didapatkan nilai frekuensi dominan (f0) yang terbagi kedalam dua zona yaitu 1,4–3,5 Hz dan 3,5–6 Hz. Sedangkan nilai faktor amplifikasi (A0) berkisar antara 2–8. Nilai indeks kerentanan seismik (Kg) berkisar antara 1–30, daerah dengan indeks kerentanan seismik (Kg) sedang hingga tinggi berada di Kecamatan Ngamprah dan Kecamatan Cisarua, sedangkan indeks kerentanan seismik (Kg) pada daerah Kecamatan Padalarang relatif rendah hingga sedang.ABSTRACT – Seismic Microzonation of Padalarang District, West Bandung Regency Using Horizontal to Vertical Spectral Ratio (HVSR) Method.  In the last five years, tectonic activity has increased in the southern region of Java Island. One of the active faults in the West Java region is Cimandiri Fault and Lembang Fault. The Cimandiri Fault is southwest-northeast, while the Lembang Fault is east-west. Through DEM (Digital Elevation Model) satellite imagery, the intersection of the faults is probably located in Padalarang, West Bandung Regency. The existence of urban infrastructures such as toll roads, railways, and dense settlements makes this area have the potential to experience damage during an earthquake. Therefore, in mitigation efforts, microzonation studies are needed to determine the dynamic characteristics of soils in the area. Horizontal to Vertical Spectral Ratio (HVSR) method is used to estimate the value of dominant frequency (f0) and the amplification factor (A0) from microtremor measurement data. From 42 measurement points, the dominant frequency value (f0) is divided into two zones, 1.4–3.5 Hz and 3.5–6 Hz. The amplification factor (A0) ranges from 2–8. The value of the seismic vulnerability index (Kg) ranges from 1–30; areas with moderate to high seismic vulnerability indexes are in Ngamprah and Cisarua Districts, while the seismic vulnerability index in the Padalarang District is relatively low to moderate. 
Microzonation of Cisarua District using Horizontal Vertical Spectral Ratio Erlangga Ibrahim Fattah
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 5, No 2 (2021)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (583.325 KB) | DOI: 10.24198/jiif.v5i2.31533

Abstract

The Bandung region is part of the framework of the Indonesian tectonic system, namely the tectonic plate meeting zone, where the Indo Autralia plate is infiltrated under the Eurasian plate in a convergent manner. The subduction process produces an effect in the form of an active fault geological structure in the Bandung area. One of these active faults is the Lembang Fault, which has a length of ± 29 kilometers and a shear acceleration of 3 to 5.5 millimeters per year. The microtremor measurement method is a passive geophysical method that utilizes natural subsurface vibrations so that it can provide dominant frequency data and amplification factors for soil layers. Based on the results of seismic susceptibility research using microtremor measurements using the HVSR method in the Lembang Fault zone in Cisarua Sub-District, it can be seen that the distribution of the dominant frequency values tends to be influenced by lithology and topography. In the research area, it is known to have a dominant frequency value that varies due to the different types of lithological units. In general, the dominant frequency ranges from 1-3 Hz because it is dominated by tuff sand and tuff pumice, and areas composed of volcanic breccias have a dominant frequency value between 3-6 Hz. Meanwhile, the amplification factor value will be influenced by rock deformation and weathering. The area that has a very high amplification factor value is in the southeast of the study area with an A0 value greater than 5. This indicates that the area is composed of a layer of thick and not dense tuff sand.
Co-Authors Adrin Tohari Gabrio Hikma Januarta Hana Yudi Perkasa Lasroha Marulitua Panjaitan Rizki Wulandari Suhendi, Cahli Tedi Yudistira