Tanna | Ambae | Karua | Ambrym | Lopevi | Gaua
Ambae Island and Lombenben Volcano
Flood and explosion at
Voui Lake | Voui
Lake: 50 million cubic meter of acid water | Recent
resumption of volcanic activity | Real-time
monitoring of the volcano
Recent resumption of volcanic activity
A resumption of volcanic activity has been observed
since 1990 in the crater lake Voui. This has resulted in deforestation
of the lake's islets, and of the western shores downwind of
the acid gases. A photograph taken on March 20, 1995,
seventeen days after the phreatic explosion (itself limited to the
ejection of chunks of sediment over the summit area) shows the substantial
rise in temperature of the water, evidenced by a lowering of the
lake's level due to increased evaporation. The level dropped by
7 metres, representing a volume of 13,500 m3 of water. By the beginning
of June 1995, the water was still at a temperature of 40°C.
Along with this resumption of activity in the lake in 1991, a near-surface
quake (magnitude 4.8) was recorded on December 4, 1994. It was centered
in the vicinity of Ambae and was followed by several after-shocks.
The quake was strongly felt by the population, particularly in the
northern districts of the island. It triggered an alert, which was
maintained for several months, a period during which another phreatic
explosion occurred (March 3, 1995). By late March, the tremors were
observed to decrease in intensity, and the alert level was downgraded.
In the end, no one among the 9000 residents of the island threatened
by the volcano needed to be evacuated.