Wednesday, November 29, 2017

Zone of Danger of Mount Agung of ITB Researcher

Seeing the high activity of Gunung Agung in Bali recently, the lecturer of the Bandung Institute of Technology immediately held a remote sensing study to predict the potential danger zone that can be generated. How to study the sensing in question?

Not more than a week since the start of research on Friday, September 22, 2017, the results of research lecturers ITB has been successfully released and can be a solution for people around Mount Agung.

Mount Agung Bali
Mount Agung Bali

Those involved are Prof. Ketut Wikantika, Dr. Eng. Asep Saepuloh, and Tri Muji Susantoro, Drs., MT. Everything from Center for Remote Sensing (CRS-ITB)

Based on research, 51 years ago Mount Agung had erupted with a very powerful force. History records, not less than 1,700 people died as a result of the incident.

It is this past experience that makes the fear of Mount Agung very high. Moreover, its activity has increased rapidly since the last few weeks.

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Based on this fact, Prof. Ketut along with his doctoral student, Tri Muji Susantoro, and assisted by Dr. Asep Saepuloh, conducted a study on the potential dangers that can be caused by Mount Agung.

They use remote sensing techniques that become their daily focus field. There are four potentials that they analyze, namely the direction of the lava flow, volcanic bombs, hot clouds, and cold lava that fell due to heavy rain after the eruption occurred.

The potential of Mount Agung's hot lava flow analysis is based on two things, namely the Watershed (DAS) that develops from the top and analyzes the sheer thickness of the crater condition.

Meanwhile, the potential of volcanic bombs was analyzed by establishing a hazard zone based on a reference distance from the peak of the eruption in 1963. The analysis of the potential of hot clouds and cold lava was also carried out by utilizing the watershed and the thickness of the crater condition, but with a wider area of ​​analysis.

The data they use for the research itself comes from the Shuttle Radar Topographic Mission (SRTM) and Landsat 8. Specifically on Landsat 8 data, the processing is done by radiometric correction which includes radiometric calibration and atmospheric correction. The radiometric calibration itself is done by changing the digital value in Top of Atmosphere, while the atmospheric correction is done by the FLAASH method.

The result, Ketut and Tri Muji successfully predicted that the direction of the hot lava flow of Mount Agung will still tend to move northwards.

"The direction of hot lava flow will tend to the north because it turns out the crater wall in the north is thinner and lower than the crater wall in the east, south, or west," Ketut said in a press release received

"If the flow of hot lava to the west, the chances are still small because there is a ridge," added the chairman of CRS-ITB this.

This remote sensing study also shows the potential for movement of hot lava flows to a distance of 7.5 km north of Mount Agung. Therefore, Ketut suggested that all residents who remain in the zone remain vigilant and always pay attention to directives from the local BPNB.