|
|
Country: | Japan | |
| Subregion Name: | Honshu (Japan) | ||
| Volcano Number: | 0803-24= | ||
| Volcano Type: | Complex volcano | ||
| Volcano Status: | Historical | ||
| Last Known Eruption: | 1919 | ||
| Summit Elevation: | 2041 m | 6,696 feet | |
| Latitude: | 39.850°N | 39°50'59"N | |
| Longitude: | 141.004°E | 141°0'16"E | |
| Viewed from the east, Iwate volcano has a symmetrical profile that invites comparison with Fuji, but on the west an older cone is visible containing an oval-shaped, 1.8 x 3 km caldera. After the growth of Nishi-Iwate volcano beginning about 700,000 years ago, activity migrated eastward to form Higashi-Iwate volcano. Iwate has collapsed seven times during the past 230,000 years, most recently between 739 and 1615 AD. The dominantly basaltic summit cone of Higashi-Iwate volcano, Yakushi-dake, is truncated by a 500-m-wide crater. It rises well above and buries the eastern rim of the caldera, which is breached by a narrow gorge on the NW. A central cone containing a 500-m-wide crater partially filled by a lake is located in the center of the oval-shaped caldera. A young lava flow from Yakushi-dake descended into the caldera, and a fresh-looking lava flow from the 1732 eruption traveled down the NE flank. | |||
