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RISS 인기검색어
- 검색키워드
- 저자 : Arief R. Achmad (검색결과 2 건)
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Arief R. Achmad,이슬기,박성재,엄진아,이창욱 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.6
The Baekdu Volcano is located on the border between Jilin Province, China, and Ryanggang Province, North Korea. Its 946 AD eruption had a Volcanic Explosivity Index (VEI) of 7, making it among the most massive eruptions in the past 2000 years, a “Millennium eruption”. Mount Baekdu may erupt in the near future. To examine the future impact of Mount Baekdu, we generated a synthetic interferogram using a Mogi model equation to produce a simulated surface deformation phase and added simulated orbital error, topographic error, and atmospheric effects phases. We output the simulation results to the program LAHARZ, which can generate a potential hazard zone due to lahar flow. Using LAHARZ, the area affected by a Baekdu lava flow would be 4.575, 14.522, 15.866, 60.351, 404.848, 3,019.298, and 6,001.885 km2 with a VEI scale eruption of 1 to 7, respectively, while the synthetic interferogram showed that the simulated surface deformation at Mount Baekdu would be 0.04 cm, 0.1 cm, 0.7 cm, 10 cm, 1 m, 12 m, and 100 m according to the VEI category. This study can be used to estimate the interferometric synthetic aperture radar (SAR) surface deformation of Mount Baekdu and produce a hazard inundation zone map with a more certain lahar flow volume in an actual volcanic eruption and surface deformation detected using SAR images on inflation of the magma chamber.
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Suci Ramayanti,Arief R. Achmad,정한철,조민정,김상완,박유철,이창욱 한국지질과학협의회 2022 Geosciences Journal Vol.26 No.6
Mount Etna has erupted several times since it was first formed. Recently, Mount Etna began erupting again over 24–27 December 2018. Because it erupts frequently, Mount Etna should be observed on a frequent basis. From June 2018 to October 2019, 34 and 56 synthetic aperture radar (SAR) images were acquired from the ascending and descending tracks of the Sentinel-1 satellite, respectively. We employed the Stanford Method for Persistent Scatterers (StaMPS) and a refined small baseline subset (SBAS) InSAR method to produce a surface deformation time-series map. In the time-series analysis, the phase signal remained unaltered with time. The Okada model was then applied to the result to generate a modeled interferogram, and the Q-LavHA program was run to generate a lava flow prediction model. A direct comparison of the results showed that Persistent Scatterers Interferometry (PSI)-StaMPS and the refined SBAS technique were comparable in terms of the displacement pattern, with slightly different velocity values obtained for individual points. In particular, a velocity range of −25 to 21 cm/yr was obtained from PSI-StaMPS, whereas a range of −30 to 25 cm/yr was obtained from the refined SBAS method. Upon computation of the vertical and east-west displacement components based on ascending and descending track data using both methods, deformation velocities of 51.5 and 52.5 cm/yr in the westerly direction on the western flank of Mount Etna were obtained from PSI-StaMPS and the refined SBAS method, respectively, whereas on the eastern flank, deformation toward the east was estimated to occur at a velocity of 50.1 or 54.2 cm/yr, respectively. PSI-StaMPS estimated a vertical deformation velocity of −5.3 to 18.3 cm/yr, whereas the refined SBAS method produced a velocity range of approximately −7 to 19 cm/yr. The interferogram obtained via Okada modeling showed two fault sources in the 2018 Mount Etna eruption and a total volume change of approximately 12.39 × 106 m3. From the modeling results, a lava flow prediction model was generated using the QLavHA program. The approaches described in this study can be used by government officials, authorities, and other decision-makers to monitor and assess the risk of volcanic activity in the region.
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