Volcano Eruption : Mt. Merapi (26 October 2010)

Monitoring of Merapi Volcano Eruption using Differential Interferometric SAR (DInSAR)




Merapi, whose name means Fire Mountain in Javanese (language in central Java island), is an active stratovolcano which has erupted regularly since at least 1006. The active volcano Merapi (center coordinate of crater : 7o 32’ 21” S, 110o 27’00” E) located at central Java, Indonesia and close to Yogyakarta city in south, Muntilan city in west and Surakarta city in east of this volcano. Seismic activity around the volcano started increasing in mid-September 2010, culminating in repeated outbursts of lava and ash, which began with three eruptions on October 26, spewing lava down the southern and southeastern slopes. Dangerous lava ejections accompanied by enormous clouds of ash occured the next day in a spectacular pyroclastic flow call wedhus gembel, Javanese for shaggy goat.
Our center monitored the Mount Merapi, Indonesia that erupted on October 26 and November 4, 2010 by using differential synthetic aperture radar interferometry (DInSAR) technique. DInSAR technique was employed to retrieve volume change of damage area and volcanic sediment in this area by assessing L band ALOS PALSAR data. Based on our ground survey result, Fig.1 shows the distribution of mount Merapi volcanic ash that distributed in Java island, Indonesia where the volcanic ash reached about 400 km away from the crater.
Fig.2.(a) shows the Terra ASTER images of Mount Merapi eruption (November 15, 2010) and Fig.2.(b) shows the distribution of volcanic materials thickness that derived by using DInSAR technique of ALOS PALSAR. The results reveal the volume of the damaged area, or deformation, and the volume of sedimentation in the study area are 1.4 million and 2.2 million m3, respectively, and indicate that the radius of the dangerous area is 15.6 km.
(Contact person : Josaphat Tetuko Sri Sumantyo jtetukoss@faculty.chiba-u.jp)