研究目的
Investigating the crustal deformation associated with the eruption of Sierra Negra volcano, Galápagos Island, on June 26, 2018, using L-band Synthetic Aperture Radar data.
研究成果
The vertical displacement derived from ALOS-2 was about 8 m, which is greater than that in the previous eruption in 2005, indicating the volume of magma in this eruption may be larger than that in the 2005 eruption. The area of lava flow also suggests the same thing. Continuous observation of Sierra Negra volcano is necessary for better understanding the process of this eruption and predict the subsequent one.
研究不足
The interferogram showed that the caldera floor was almost completely incoherent due to large deformation, leading to difficulty in calculating magnitude of displacement. The temporal baseline of ALOS-2 was much longer than that in Sentinel-1, and the large surface deformation of deflation concealed that of trapdoor faulting.
1：Experimental Design and Method Selection:
Used ALOS-2/PALSAR-2 SAR data for monitoring surface changes due to the eruption. The Gamma software was used to process their level
2：1 data. Intensity analysis, Interferometric SAR (InSAR), and offset tracking using ALOS World DEM – 30 m were conducted to reveal co-eruptive surface deformation. Sample Selection and Data Sources:
Analyzed SAR data listed in Table 1, including descending SM1, ascending SM3, and descending SM3 mode.
3：List of Experimental Equipment and Materials:
ALOS-2/PALSAR-2 SAR data, Gamma software, ALOS World DEM – 30 m.
4：Experimental Procedures and Operational Workflow:
Performed intensity analysis to confirm lava flow extent based on the correlation coefficient between two images. Conducted InSAR and offset tracking to reveal surface deformation.
5：Data Analysis Methods:
Used image correlation algorithms for offset tracking to detect meter-scale surface displacement. Derived three-dimensional components of surface deformation using both ascending and descending offset tracking results.
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