CRATER MORPHOLOGI AND VOLCANIC PRODUCTS COVERAGE AT AGUNG VOLCANO ANALYSES BASED ON SENTINEL-1A DATA
<p align="justify">This undergraduate thesis presents the techniques for analyzing the topographical changes of the summit of Agung Volcano including crater morphology and volcanic ash coverage following the eruption based on Sentinel-1A data. Following dormant period for about 50 ye...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/28256 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | <p align="justify">This undergraduate thesis presents the techniques for analyzing the topographical changes of the summit of Agung Volcano including crater morphology and volcanic ash coverage following the eruption based on Sentinel-1A data. Following dormant period for about 50 years, Agung volcano entered a new eruption phase, that is identified by fumarole activities in early November 2017, followed by a phreatic eruption at 21 November 2017 and magmatic eruption at 25 November 2017, 24 December 2017, 11 January 2018, 11 March 2018, 28-29 June 2018, and 2 July 2018. Mitigation scenarios are necessary to prevent inevitable loss of thousand lives. Therefore, this study is raised to assist to decision maker especially for mapping the hazard near the summit correctly. To obtain the morphological change related to the eruptions, a topographical change detection technique is proposed using series of Synthetic Aperture Radar (SAR) remote sensing images. Polarimetric Decomposition method was selected to identify the properties of Agung Summit based on SAR backscattering intensity measurement. The analyses were taken into account based on entropy (H) and alpha angle (α) produced by polarimetric backscattering decomposition. In addition, the optic sensor image from Sentinel 2 was also used to clarify the results of polarimetric decomposition method. Then, the results of both images were analysed spatially and temporally. According to spatial and temporal analyses, the topographical change of Agung Summit could be detected because new volcanic products existed (e.g. lava flow and fumarole steam) inside and outside the crater. The lava flows were distributed mostly at western part in the crater rim about 20.251 ha. Meanwhile, fumarole steam was distributed mostly at northern part in the crater rim about 13.216 ha. The temporal variation of volcanic products distribution could describe Agung Volcano eruption stages.<p align="justify"> |
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