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All Journal Prosiding Seminar Nasional Rekayasa dan Teknologi (TAU SNAR- TEK)
Sinatrya Diko Prayudi
Departemen Teknik Geologi, Fakultas Teknik, Universitas Diponegoro
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering

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Pengaplikasian Metode Penginderaan jauh dan Pendekatan Geologi Sederhana dalam Kajian Masalah Penurunan Tanah di Wilayah Pesisir Semarang dan Demak: Studi Komparasi antara Asumsi Umum dan Alternatif Sinatrya Diko Prayudi; Hayat Safi’i; Najib Najib
Prosiding TAU SNARS-TEK Seminar Nasional Rekayasa dan Teknologi Vol. 1 No. 1 (2019): Prosiding TAU SNAR-TEK Seminar Nasional Rekayasa dan Teknologi 2019
Publisher : Fakultas Teknik dan Teknologi - TANRI ABENG UNIVERSITY

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Abstract

The land subsidence occurring in the coastal of Semarang City and Demak Regency is one of the geological disaster issues that is quite interesting to discuss. With the subsidence rate ranging from 10 cm/year and the proof on the surface can be observed through the naked-eye, causing the local government to look at this problem seriously enough to know the main problems. Referring to some research, a strong suspicion arises as an influencing factor, namely over-exploitation of groundwater that high enough to overdo the coastal area which causes the aquifer to be depleted underneath and triggers aquifer compaction, making the layer become unstable and triggers land subsidence at surface. The assumptions made in Semarang City are not in line with what happened in the coastal area of Demak Regency, because the area does not over-exploited, but its territory now submerged by seawater. In research carried-out using a methodology that includes literature study, analysis of remote sensing imagery data, and regional geological approaches. Several literature studies found indicate that there are other factors that trigger land subsidence with addition to groundwater problem, namely the existence of subsurface geological structures where the appearance on surface is not visible, with intersecting directions. The distribution of areas subject to the structure based on results of the remote sensing analysis includes areas where intensive land subsidence occurred on one side and areas not affected on the other. The movement of these subsurface structures is thought to trigger an increase or decrease in subsurface rock blocks and cause quaternary alluvium deposits above become unstable based on the geological approach. Some of these conditions triggered the emergence of new assumptions besides factors from groundwater extraction in the study area.
Pengaplikasian Olah Data Penginderaan Jauh, Pendekatan dan Permodelan Geologi dalam Kajian Bencana Likuifaksi di Wilayah Kabupaten Sigi, Provinsi Sulawesi Tengah Sinatrya Diko Prayudi; Rino Dwi Hutama; Aska Zakiya; Thomas Triadi Putranto; Devina Trisnawati
Prosiding TAU SNARS-TEK Seminar Nasional Rekayasa dan Teknologi Vol. 1 No. 1 (2019): Prosiding TAU SNAR-TEK Seminar Nasional Rekayasa dan Teknologi 2019
Publisher : Fakultas Teknik dan Teknologi - TANRI ABENG UNIVERSITY

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Abstract

Liquefaction is a natural phenomenon on the earth surface of the earth that quite dangerous to deadly if occurs in area with high population density. The case of Sigi Regency which took place on 28 September 2018 as a domino effect of 7,4 magnitude earthquake with an epicenter distance of 80 km from Palu City or 90 km from Petobo area, Sigi Regency. The aftershock that occur propagate below the surface, condensing and mixing loose material that accumulates with ground water when reaches target area. Those disasters had been predicted since 2012 by a number of researchers opened society mind about after impact phenomena from a main disaster that followed. The main result of this research focused on giving simple explanation about how the liquefaction occur in timescale using combination of remote sensing, geoscience data, and 3D-modelling. Through the analyzing of Landsat 8 as main remote sensing data from different acquisition time, it was found that there were significant changes in land use appearance between before and after the disaster. The topography shown through Digital Elevation Model (DEM) data presented both 3D and cross section increase the potential indication for liquefaction material movement that tends to descend the slope, from east to west. The geological approach taken refers to the literature study related to regional condition of study area which includes lithology – sedimentology, and structural geology. The result of the regional geology study found the combination of unconsolidated rocks in form of alluvium (Qa) – Pakuli Formation (Qp) and interaction of Palu – Koro fault line as deriving factor of liquefaction. Another factor such hydrogeology and geotechnical aspect indicated to play a role as a sufficiently strong trigger factor for the disaster to occur. From some aspect above are further overlayed in simple geological 3D-modelling to explain the sequence of events that occur and the role of each factor in causing liquefaction in the case study area.
Co-Authors Aska Zakiya Devina Trisnawati Hayat Safi’i Najib Najib Rino Dwi Hutama Thomas Triadi Putranto, Thomas Triadi