On October 26, 2010, Mt. Merapi, located on the island of Java in Indonesia, started to show eruptive activity for the first time in five years.
The Merapi-style pyroclastic flows that are characteristic of Mt. Merapi were generated frequently alongside explosive eruptions, and there are concerns that the impact of the massive volume of volcanic products may lead to future long-term damage, such as in the form of mudslides.
Imaging Using TerraSAR-X (Synthetic Aperture Radar)
Using the high-resolution synthetic aperture radar (SAR) satellite TerraSAR-X, PASCO attempted to extract the changes arising as a result of the series of eruptive activity. TerraSAR-X is able to conduct imaging during the volcanic activity in a safe manner, without being impacted by the plumes and ashes.
|Acquisition dates and times||:||October 26, 2010, 22:21 (UTC)
November 6, 2010, 22:21 (UTC)
|Angle of incidence||:||37°|
|Acquisition orbit||:||Descending orbit|
|Polarization mode||:||Single polarization (HH)|
|Ground range resolution||:||Approximately 3 m|
Taking advantage of the characteristics* of TerraSAR-X images, we have extracted the areas that show changes in ground surface unevenness.
The areas shown in dark red or blue are believed to be areas that have undergone changes as a result of volcanic activity.
*Characteristic of TerraSAR-X: The backscattering intensity of microwaves differs according to the condition (degree of roughness) of the ground surface unevenness.
By comparing aerial photographs taken by Badan Nasional Penanggulangan Bencana (BNPB) from the same angle, we observed that, like the aerial photographs, the changes extracted by TerraSAR-X showed the flow range of the pyroclastic flows.
History of Information Released
First release date:December 28, 2010 (Tuesday)
From the perspective of understanding the damage situation caused by the disaster, and of providing information to the relevant organizations, PASCO carried out estimations for the areas of damage immediately utilizing SAR satellite images, which are not impacted by weather conditions.
We express our deepest sympathy to all who have been affected by the disaster.
We will strive even harder to be of service to all through the application of our spatial information processing and analysis technologies, as well as through our disaster prevention consulting expertise, in order to obtain accurate information on the disaster situation and assist in the recovery of the affected areas.
<TerraSAR-X : InfoterraGmbH, Distribution [PASCO]>
*The reuse or copying of images and other information available here without prior permission is strictly prohibited.
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