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http://dx.doi.org/10.7780/kjrs.2018.34.6.4.8

Evaluation of Recent Magma Activity of Sierra Negra Volcano, Galapagos Using SAR Remote Sensing  

Song, Juyoung (Department of Earth and Environmental Sciences, Seoul National University)
Kim, Dukjin (Department of Earth and Environmental Sciences, Seoul National University)
Chung, Jungkyo (Jet Propulsion Laboratory, California Institute of Technology)
Kim, Youngcheol (Department of Earth and Environmental Sciences, Seoul National University)
Publication Information
Korean Journal of Remote Sensing / v.34, no.6_4, 2018 , pp. 1555-1565 More about this Journal
Abstract
Detection of subtle ground deformation of volcanoes plays an important role in evaluating the risk and possibility of volcanic eruptions. Ground-fixed observation equipment is difficult to maintain and cost-inefficient. In contrast, satellite remote sensing can regularly monitor at low cost. In this paper, following the study of Chadwick et al. (2006), which applied the interferometric SAR (InSAR) technique to the Sierra Negra volcano, Galapagos. In order to investigate the deformation of the volcano before 2005 eruption, the recent activities of this volcano were analyzed using Sentinel-1, the latest SAR satellite. We obtained the descending mode Sentinel-1A SAR data from January 2017 to January 2018, applied the Persistent Scatter InSAR, and estimated the depth and expansion quantity of magma in recent years through the Mogi model. As a result, it was confirmed that the activity pattern of volcano prior to the eruption in June 2018 was similar to the pattern before the eruption in 2005 and was successful in estimating the depth and expansion amount. The results of this study suggest that satellite SAR can characterize the activity patterns of volcano and can be possibly used for early monitoring of volcanic eruption.
Keywords
Sierra Negra; Volcano; Sentinel-1; PS-InSAR; Mogi model;
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