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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA)
Banyunegoro, Vrieslend Haris
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Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

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EARTHQUAKE RELOCATION USING DOUBLE DIFFERENCE METHOD FOR 2D MODELLING OF SUBDUCTING SLAB AND BACK ARC THRUST IN WEST NUSA TENGGARA Taruna, Rian Mahendra; Banyunegoro, Vrieslend Haris
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 8, No 2 (2018)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v8n2.p132-143

Abstract

West Nusa Tenggara is classified into earthquake prone zone as it is located between subduction and back arc thrust earthquake sources. Accurate hypocenter determination in this area is necessary for strong motion calculation and earthquake source zone modelling. Earthquake relocation in the region is needed to produce a more accurate hypocenter location and 2D modelling of subduction slab and back arc thrust. A double difference method was employed with earthquake data from 2009-2017. The results show better accuracy in the distribution of the travel-time residual. Subduction slab modelling shows a dip value of about 7-13° from a trench to an arc, 49-55° from an arc to a transition zone, and 60-64° dip at a depth of 300 km. Back arc thrust modelling shows a dip value of about 19-28° at a depth of 15-30 km. The results provide a reliable 2D model for subduction slab and back arc thrust in West Nusa Tenggara. Therefore, the developed models can be used as reference for earthquake zones and seismic hazard assessment in West Nusa Tenggara.
Reconstruction of the Indian Ocean Tsunami in 2004 in Sabang Based on the Current Land Cover for Tsunami Evacuation Sites Recommendations Jihad, Abdi; Al Atas, Zaenal; Banyunegoro, Vrieslend Haris; Anugrahningrum, Herdiyanti Resty; Ginting, Rika Adenila; Putra, Kurniallah Perdana; Rusdin, Andi Azhar; Ardiyansyah, Tommy; Yatimantoro, Tatok
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 13 No. 2 (2023)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v13n2.p174-189

Abstract

Sabang City has grown in term of city’s population as well as the tourism activity. The development also meant there are more area that has been used when compared to the time before the 2004 tsunami. This research was developed to re-identify tsunami-prone zones with the current land cover condition in Sabang City and to provide recommended safe locations, alternative evacuation routes, and additional evacuation sites. We used Cornell Multi-grid Coupled Tsunami Model (COMCOT) to carried out the tsunami simulation added with updated land cover to provide more accurate simulation model. The simulation pointed out several tsunami hazard zones in Sabang City, such as Balohan, Kuta Ateuh, and Iboih with expected tsunami heights to be more than 3 meters and arrival time less than 60 minutes. Those areas then surveyed to develop recommendations for tsunami risk reductions. The recommendations included nine additional evacuation buildings are proposed, three sites in each zone. Another recommendation is in form of evacuation routes in each zone to complement existing routes stated in RTRW document.
Co-Authors Al Atas, Zaenal Anugrahningrum, Herdiyanti Resty Ardiyansyah, Tommy Ginting, Rika Adenila Jihad, Abdi Putra, Kurniallah Perdana Rusdin, Andi Azhar Taruna, Rian Mahendra Yatimantoro, Tatok