Water Volcano

Friday - 16/10/2020 13:02
Volcanic activities in the Ly Son–Sa Huynh Geopark from 10 million years ago up to a few hundred thousand years ago have generated outstanding extrusive basaltic rocks in the northeastern part of the Geopark’s territory, including the foundation of Ly Son Islands and the seabed between the islands and the mainland.

However, these extrusive basaltic rock are not products of Ly Sons’ volcanic activities. First, studies show Ly Son craters formed just tens of thousands of years ago, even a few thousand years ago. Furthermore, explosions—rather than magma eruptions—caused these craters, with the products being ash, debris, and only a small amount of lava. 

Scientists have identified dozens of volcanoes on and around Ly Son islands, including those below the present sea level. On the Big Island, there are at least five volcanoes, each given a unique name by the ancient people, either from the perspectives of yin-yang of the five elements, or visually described. The named volcanoes include Wood (Hon Soi), Fire (Gieng Tien), Earth (Hon Vung), Metal (Hon Tai) and Water (Thoi Loi). Among these, Gieng Tien and Thoi Loi are the two biggest and highest.

The largest volcano, Thoi Loi (Water), is 169 meters high and is a twin volcanic tuff ring. The larger ring is about 1 kilometers in diameter, the smaller and the younger one is 500 meters wide. Ash and debris exploded from these two rings generated a slope of an area of 1.2 square kilometers. The smaller ring serves as a reservoir supplying water for farming and daily activities. A northern part of the larger ring eroded, forming Hang Cau Cliff. Scientists can see that at least five or six explosion episodes occurred in the cliff, depositing ash and debris in the water—this could indicate that the explosions happened during an era of a shallow sea, perhaps 20,000-30,000 years ago. Water marks on the cliff are of about 6,000-7,000 years old, when the sea level was higher than today. The small tuff ring formed on land, when the sea level was lower, perhaps 3,000–4,000 years ago.

Water Volcano was granted a National Monument Title by the Ministry of Culture, Sports and Tourism in 2020.
nui lua thoi loi
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