Hakone

SUMMARY:

Type: compound with caldera
Activity: dormant
Last Eruption: ~3,000 yrs BP
Rock Type: ?
Eruptive Volume: ? cu km
Location Map from Xerox PARC
Latitude: 35.21 N
Longitude: 139.01 E

GEOLOGIC HISTORY

Hakone volcano is truncated by two calderas, the largest of which is 10 x 11 km wide. The calderas were formed as a result of two major explosive eruptions about 180,000 and 49,000-60,000 years ago. Post-caldera volcanism has consisted primarily of the growth of a half dozen lava domes along a SW-NE trend cutting through the center of the calderas. The largest of these, Kami-yama, forms the high point of Hakone. The calderas are breached to the east. Blockage of the Haya-kawa river about 3,000 years ago created Lake Ashi, which along with major thermal areas in the caldera, constitutes a major resort area SW of Tokyo.

Historic Activity: Hakone last erupted phreatically about 3000 years ago, although seismic swarms have occurred frequently during the 20th century. Many fumaroles and hot springs remain active.

Recent Activity: A swarm of about 300 earthquakes was recorded on April 22, 1991 in the central part of the caldera.

Data Sources

• Global Volcanism Network (V. 16, No. 4).

ADDITIONAL INFORMATION

• Link to Global Volcanism Network's Hakome Information
• Link to VolcanoWorld's Hakone Info

Last Update: 2/27/00