Potential runoff biggest Merapi cold lava floods in the river Putih in region of the Yogyakarta estimated to 270 meters from the river shore.
Based on estimates of National Disaster and Investigation Agency in collaboration and developing of Technology volcano and Geological Agency of Gadjah Mada University.
Therefore, a mapping with LiDAR imagery and modeling brunt of hot clouds and cold lava on Mount Merapi, which will indicate areas potentially affected by runoff cold lava.
Potential flood of cold lava will also occur in river Woro, Gendol/Opak, Kuning, Boyong/Code, Krasak, Putih, and river Pabelan is a combination of Trising, Senowo and Apu on it.
Lava flow model in Gendol showed no direct threat to Prambanan tourist areas, while lava flow model in Apu, Trising and Senowo runoff potentially occur at the confluence of the three rivers that flow in Pabelan.
Sutopo Purwo Nugroho, The Head of Data Information and Public Relations of the National Agency for Disaster Management (BNPB) said there are currently lahar monitoring system with real-time calculation.
The system with rain sensor 15 upstream and 19 sensors of AFM [acoustic flow monitoring] to detect the movement of lava flooding, as he said today.
According to him, the equipment is also equipped with a camera, so that the movement of Mount Merapi cold lava floods can be better monitored.
To increase community preparedness, socialization and training for local residents and facilitators available, submission of disaster management messages are also carried out through print and film on disaster mitigation to the community, he added.
In addition, builds disaster information system of village (Sikab), which is building a village-based disaster information system so that the remote villages.
This information, disclosed Sutopo as a way to obtain information quickly and Mount Merapi actual further conveyed to the public.
BNPB and UGM Prepare Anticipatory Steps
National Disaster Management Agency (BNPB) in cooperation with the Board of Inquiry and developing of Technology volcano and Geological Agency of Gadjah Mada University in anticipation of a flood of cold lava and the eruption of Mount Merapi.
These institutions carry out of Merapi Secret Program or Risk Analysis, Hazard Assessment, Information and Warning System Based on Communities Awareness of Merapi.
According to Sutopo Purwo Nugroho, Head of Data Information and Public Relations of the National Agency for Disaster Management (BNPB), cooperation is also for disaster risk reduction after the eruption in 2010.
“Eruption of Mount Merapi volcanic material issued approximately 130 million M3 sector spread to East, South and West in the form of pyroclastic deposits,” he said today.
Today, the cold lava material is estimated around 80 million M3 over on Mount Merapi.
In fact, more than 20 mm of rain intensity for two hours continuously will trigger the flow of lava.
Sutopo explained that there are four activities in Merapi secret program conducted since March 2012, that the image of LIDAR mapping and modeling the brunt of hot clouds and lava cool.
In addition, the improvement of lava hazard early warning systems in real time, re-analysis of disaster risk and strengthening community capacity.
“The image of the LIDAR [light detection and ranging], the topography of the river flow can be displayed with a resolution of 3-dimensional shape 15 centimeters,” he said.
As a result, states will be known Sutopo hamlets devastated by pyroclastic estimated accurately.