Traces of Unknown Mount Fuji Eruptions Found
Tokyo, Oct. 12 (Jiji Press)--Traces of two past unknown eruptions of Mount Fuji have been found in a layer at the bottom of Lake Motosu, northwest of Japan's tallest mountain, according to a research group including Akita University.
The finding about the 3,776-meter volcano, a UNESCO World Heritage site, was recently reported in the online edition of a Dutch journal.
"Characteristics of past eruptions and precise data on intervals between them are useful for drawing up hazard maps," said Stephen Obrochta, professor at Akita University.
Municipalities near the mountain, which straddles Yamanashi and Shizuoka prefectures, central Japan, are working on revising hazard maps that will be utilized for evacuation plans in the event of an eruption.
Sediment at the bottom of deep lakes is relatively insulated from the effects of wind and waves and tends to contain plankton that can be used to estimate age.
[Copyright The Jiji Press, Ltd.]