Satellite imagery has once again demonstrated how volcanic processes\ncan reshape the surrounding environment. Sertung Island is no longer\ngreen. The island, located to the west of Mount Anak Krakatau, appeared\ngreen a month ago but has now turned grey to brownish when viewed via\nthe Sentinel-2 satellite.<\/p>\n
This striking change was observed by the satellite two days after the\nintensive eruption of Anak Krakatau between 4\u20136 September, leaving\ntraces that extend beyond just ash columns and volcanic ejecta.<\/p>\n
A comparison between images from 8 August and 8 September shows a\nstrong contrast. Before the eruption, vegetation covered most of\nSertlag\u2019s surface. Following the eruption, the green hue has almost\nvanished. Pulau Panjang, to the east of Anak Krakatau, still maintains\nrelatively clear vegetation, while Rakata to the south also shows\nchanges, though not as severe as Sertung.<\/p>\n
The difference between the islands is noteworthy, providing an\nillustration that the impact of Anak Krakatau\u2019s eruption does not spread\nwith equal intensity in all directions. In a very short period, the\nsurface of an island that has long been covered in vegetation can\nundergo large-scale transformation.<\/p>\n
The frontline island<\/strong><\/p>\n Sertung covers an area of approximately 1,057 hectares and is\nsituated only about four kilometres west of Anak Krakatau. Formerly\nknown as Verlaten Island, it is a vital part of the Krakatau\ncomplex.<\/p>\n Its geological history is even older than that of Anak Krakatau.\nAlong with Pulau Panjang, Sertung is part of the remnants of the old\nKrakatau caldera system. Subsequent volcanic centres, including Rakata,\nDanan, and Perbuwatan, emerged to form Krakatau Island before the\nmassive 1883 eruption drastically altered the region.<\/p>\n Its position extremely close to Anak Krakatau places Sertung on the\nfrontline whenever the volcano erupts. Since Anak Krakatau emerged and\ndeveloped in the late 1920s, the island has repeatedly received volcanic\nmaterial from eruptions.<\/p>\n Satellite imagery now once again shows how volcanic processes can\nreshape the surrounding environment. The green signal has\ndisappeared.<\/p>",
"url": "https:\/\/jawawa.id\/newsitem\/sertung-island-loses-its-green-hue-1789099477",
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