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Country: | Russia | |
| Subregion Name: | Kuril Islands | ||
| Volcano Number: | 0900-05= | ||
| Volcano Type: | Stratovolcano | ||
| Volcano Status: | Historical | ||
| Last Known Eruption: | 1932 | ||
| Summit Elevation: | 1206 m | 3,957 feet | |
| Latitude: | 44.805°N | 44°48'18"N | |
| Longitude: | 147.135°E | 147°8'6"E | |
| Conical Atsonupuri stratovolcano forms a prominent peninsula joined to the SW side of Iturup Island by a low isthmus only 30 m high. A somma volcano whose caldera rim is exposed only at about 900 m elevation on the SE side was constructed during the late Pleistocene or early Holocene, forming an island up to about 1.5 km high that was later connected to Iturup Island by erosional material. A fault with large displacement offsets the NW side of the somma of Atsonupuri (also known as Etorofu-Atosanupuri). The 2-km-wide caldera was subsequently largely overtopped by a central cone that forms the present 1206-m-high summit. Strombolian eruptions have dominated the history of this basaltic volcano; few lava flows are exposed. Only two historical eruptions are known at Atsonupuri, during 1812 and 1932. | |||
