Jakarta, domclub Indonesia
–
National Research and Innovation Agency (
Brin
) find scientific evidence
tsunami
Giant had hit southern Java thousands of years ago.This tsunami is repeated with a time lag every 600-800 years.
This finding is the result of Paleotsunami research conducted by the Brin Geological Disaster Research Center (PRKG) team.The findings are an important warning of the potential threat of megatsunami that still overshadowing the area.
Associate researcher PrKG Brin Purna Sulastya Putra said Paleotsunami was a scientific study to recognize the incident of ancient tsunamis that was not recorded in human history.
“This research is very important, because southern Java continues to develop with the development of strategic infrastructure, while the threat of giant tsunamis that repeatedly has not been fully understood and anticipated,” said Purna in a statement, Tuesday (5/8).
He said one of the crucial findings in the research was the 1,800 -year -old ancient tsunami sedimentary layer found at various points along the southern Java, such as in Lebak, Pangandaran and Kulon Progo.
“Due to its widespread distribution in many locations in southern Java, this trail is estimated to be the result of a giant tsunami caused by a magnitude megathrust earthquake of 9.0 or more. This is not the only.
Purna explained that Paleotsunami research was carried out through field observation, one of which was in the swamp and laguna environment, where sea sediments carried by tsunami waves were more easily recognized and preserved in the environment.
To prove that the layer is a tsunami deposit, the research team conducted further analysis such as microfauna tests, chemical elements to radiocarbon age.
“The challenge is that not all ancient tsunami deposits can survive intact and well-preserved, and distinguish from sediments due to other processes such as floods or storms that require caution,” he explained.
Purna said this research showed a giant tsunami in the southern region of Java to be repeated, with a cycle of around 600-800 years.
“This means, it’s not about whether a large tsunami will occur, but when,” he said.
Paleotsunami data produced by Brin can be a foundation in determining spatial policy and disaster mitigation.
Information about the distribution of affected areas, repeat periods, and estimation of inundation distances is very useful for establishing vulnerable zones, determining the location of evacuation sites, and designing efficient evacuation routes.
“Local governments should begin to use this data to develop a risk -oriented development plan, as well as conduct routine socialization to the community,” he concluded.
(lom/fea)
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