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All Journal TEKNIK Geoplanning : Journal of Geomatics and Planning
Yosuke Aoki
Earthquake Research Institute, The University of Tokyo
Earth & Planetary Sciences Engineering

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TimeFun-InSAR Algorithm to Investigate Physical Changes at Bromo Volcano by Using ALOS/PALSAR Data Sets Arliandy Pratama Arbad; Wataru Takeuchi; Yosuke Aoki
Geoplanning: Journal of Geomatics and Planning Vol 7, No 1 (2020)
Publisher : Department of Urban and Regional Planning, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/geoplanning.7.1.17-24

Abstract

Mt. Bromo is geographically located in eastern of Java Island at 112°57'30'' longitude and 7°56' latitude, with a large area of caldera ~10 Km2. The land over the volcano is a perfect area for farming, one of the important factor affects the level of soil fertility is the most mineral rich soils. Volcanic activities at Mt. Bromo has been recorded in 1775 which characterized by small eruptions with cycles ranging from one to five years. Regarding this evidence, we tried to investigate the surface changes over the Mt. Bromo by using Time-Series InSAR with TimeFun algorithm. TimeFun is an extension of SBAS to allow incorporating various functions such as seasonal oscillations, polynomials, and step functions as generally it estimates DEM errors as well and allows missing observation. The maximum allowed baseline value is defined and used to constrain the interferogram pair by selecting manual after differential InSAR processing in single face working. The proposed analysis is based on 27 SAR data sets acquired by the ALOS/PALSAR sensors during the 2007–2017 time interval. The result shows us deformation occurred up to ~10 cm at summit of Mt. Bromo during the eruption period. Time-series monitoring of surface deformation to infer volume changes, geometries and locations of sources of deformation involved in the future eruption
Estimasi Deformasi Permukaan Gunung Bromo menggunakan Analisis Time-Series InSAR Small Baseline Subset Arliandy Pratama Arbad; Wataru Takeuchi; Yosuke Aoki; Achmad Ardy; Mutiara Jamilah
TEKNIK Vol 39, No 2 (2018)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (304.108 KB) | DOI: 10.14710/teknik.v39i2.20052

Abstract

We observe the surface deformation of the Mt. Bromo which located at eastern Java Indonesia area that includes neighborhood volcanic system on TNBTS (Taman Nasional Bukit Tengger Semeru). Recently, remote sensing has played as an important role to observe volcano behaviour. We apply the SAR Interferometry (InSAR) algorithm referred to as Small Baseline Subset (SBAS) approach that allows us to generate mean deformation velocity maps and displacement time series for the studied area. The common SBAS technique, the set of interferometric phase observations writes as a linear combination of individual SAR scene phase values for each pixel independently. Particularly, the proposed analysis is based on 22 SAR data acquired by the ALOS/PALSAR sensors during the 2007–2011 time interval. A fewer studies have been able to show capability of InSAR analysis for investigating cycle of volcano especially of Mt. Bromo which characterized eruption stratovolcano in ranging one to five years. The results expected in this work represent an advancement of previous InSAR studies of the area that are mostly focused on the deformation affecting the caldera. According to the result, we expected this study could implement on risk management or infrastructure management.
Co-Authors Achmad Ardy Arliandy Pratama Arbad Arliandy Pratama Arbad Mutiara Jamilah Wataru Takeuchi Wataru Takeuchi