[STT57-P01] InSAR Detection of the Mt. Aso Volcanic Crater Activity at the event of Sept 14 2014 Eruption
Keywords:InSAR, eruption, subsidence
Mt. Aso has been active for these years and had a small-scale eruption on Sept. 14 2014. PALSAR-2 data of UB mode with 85 MHz single polarization were acquired on Sept. 7 and 21 covering these areas, and were InSAR processed (including the atmospheric correction). It was found that there were three small subsidence areas western part of the main volcanic crater. Three these areas had 5cm subsidence in average vertically. This can be interpreted as that the eruption of the magma could reduced the mass of the magma. Validation of the results has been conducted using the GPS data acquired at three points by GSI and NIED, and measured the RSSE of 2.345cm. It can interpreted that the eruption of Sept. 14 2014 were observed by two adjacent PALSAR-2 images as the subsidence of 6.06 cm, the loss of the coherence at the crater area, and resultant loss of the mass were estimated, and thus the mountain could be shrunk.