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Jakarta, CNBC Indonesia– The National Agency for Disaster Management (BNPB) has warned that there is the possibility of a massive earthquake that could trigger a large tsunami in southern Java. This potential is found in 2 locations, namely in the southern region of Banten – West Java and the south of Central Java – East Java.
Abdul Muhari, Ph.D, Plt. The director of Disaster Risk Mapping and Evacuation of BNPB, said that based on the results of the investigation carried out by BNPB and ITB, there is a segment located in the south of Banten – West Java with potential of seismic energy of up to a magnitude of 8.8.
“Meanwhile, the Central Java – East Java segment has the potential to have energy with a magnitude of 8.9 which, if released simultaneously, will produce an energy potential equal to a magnitude of 9.1,” he said when presenting the results. of the investigation before the Regional Leadership Coordination Forum of the Central Java Province, on Monday (12/28).
To respond to the potential of this great tsunami, BNPB has designed an integrated mitigation effort. One of the steps is the construction of the green belt that will take place in the near future. The greenbelt or greenbelt to be built is a group of plants that combines two types of trees, namely mangroves and palaka trees.
Mangroves are planted on the sea side with species of pandanus or other types of mangroves that can grow on sandy substrates. This plant works to reduce the energy of the tsunami. Meanwhile, the palaka, an evergreen tree, functions as a protective layer on the back or on the side of the earth.
Abdul Muhari said that the thickness and formation of this vegetation plantation would be arranged in such a way as to be based on scientific calculations so that the penetration of the tsunami was not too far inland and could minimize casualties and damage on land.
“It is intended that this planting activity begins at the beginning of the year in coordination with the local government,” Muhari said.
Meanwhile, the Governor of Central Java, Ganjar Pranowo, welcomed the information that had been presented and provided instructions for the regional chiefs to immediately follow up on the information. The ecosystem-based mitigation plan (green belt) must be implemented immediately because it can be used as a front line reducing the impact of the tsunami.
“We have to take advantage of the momentum of the rainy season that still continues until next March so that this planting works well and the vegetation grows perfectly,” said Ganjar.
According to BNPB data, there are still many districts that do not have disaster management planning documents, including the Disaster Risk Assessment (KRB).
Ganjar urged districts that do not have them to immediately compile the KRB with the help of the province and the BNPB. This can be used as a first step in identifying disaster risks in all districts and determining the necessary action plans.
Another thing that worries Ganjar is the research results presented by Abdul Muhari at the time of the 2011 tsunami in Japan, which showed that tsunamis often cause collateral damage, such as fires because waves hitting oil refineries destroy the large-scale oil deposits, so that the flammable material will be carried by water and will burn whatever it finds, whether on land or at sea.
Responding to this potential, Ganjar said a meeting was necessary with Pertamina, which has a fuel oil storage facility at Cilacap Regency. This meeting aims to discuss the need to strengthen or repair vital facilities that will potentially cause collateral damage when a tsunami occurs.
On the other hand, the government should also strengthen disaster risk reduction (PRB) efforts, such as preparing the community for a tsunami disaster. This preparedness can be carried out by strengthening disaster-resilient villages, conducting joint preparedness exercises with the government and communities, especially in areas throughout southern Java, at least three times a year.
Some areas have been identified as temporary evacuation sites (TES), but not all because some areas are located in lowlands. That is why Dr. Abdul Muhari conveyed that for areas located in the lowlands, TES can take advantage of schools or tall buildings that are resistant to earthquakes and tsunamis.
In addition, public facilities such as footbridges can also be used as temporary vertical evacuation, as has been done in Japan. The facility should be designed in such a way that it is easy for people to rush to save themselves.
Abdul Muhari and researchers from the Bandung Institute of Technology (ITB), Prof. Sri Widyantoro and Rahma Hanifa in the presence of the Governor and Lieutenant Governor of Central Java, regents in the South Java region, TNI, Polri and Forkopimda in the province of Java Central.
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