In vast AMBRA deposits found onHokkaido island, In the North of Japanwere found traces who could represent one of the oldest testimonies ever discovered of one tsunami: they date back to about 115 million years agowhen this region was submerged by the water.
This is suggested by the study published in the Scientific Reports magazine and led by the Japanese National Institute of Science and Advanced Industrial Technology (AIST), which also shows how other types of sediments coming from mainland and transported at sea they could prove useful for investigate important destructive events of the pastlike the tsunami.
The traces of tsunami occurred in the past are very difficult to identify, since the so they continually remode the coasts and deposits left by these phenomena do not easily distinguish from those produced by other events such as storms. Amberhowever, that it is a fossilized resin of trees, can rEgistle the tsunami thanks to changes features that take place in his structure When it comes transported by the mainland to the ocean.
Researchers led by Aya Kubota analyzed the Ambra deposits found on the island of Hokkaido with techniques that exploit the fluorescenceand they discovered that they present details Deformations called ‘on flame’: these structures they form When the still soft amber comes deformed before hardening completely. According to the authors of the study, this suggests that one large quantity of Ambra was quickly tscraped from the mainland towards the ocean from one or more tsunamiand once in the water it is then sunk on the seabed and covered with a layer of silt, which preserved it.
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