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Iliamna volcanstratovolcan 3053 m / 10,016 ft
Cook Inlet (SW Alaska), 60.03°N / -153.09°W Condition actuelle: en sommeil (1 sur 5) Iliamna webcams / live data
Dernière mise à jour: 7 mars 2013
Style éruptif tipique: Explosive Eruptions du volcan Iliamna: 1953(?), 1952(?), 1933(?), 1876, 1867, 1843(?), 1793(?), 1778-79, 1768(?) radiocarbon-dated: 1650 ?, 450 BC ?, 2050 BC ?, 5050 BC ?  Derniers séismes proches:
Il existe plusieurs rapports sur l'activité dans l'incertitude des 250 dernières années, mais les seuls confirmés connus éruptions historiques ont été faibles à modérées éruptions explosives en 1876, 1867, et entre 778 et 1879. Une plus grande éruption avec coulées pyroclastiques a été daté par méthode du radiocarbone et ont eu lieu entre 300 et il ya 140 ans, mais n'a pas été observé. La plupart des rapports éruption éparses de Iliamna faites probablement allusion à la forte activité des fumerolles situées à l'est et au SE du sommet. Introduction:Iliamna volcano has no distinct summit crater, but forms a flat top joined on the south by a 5 km long ridge with the prominent flank lava domes of North and South Twin Peaks. Another important flank vent is the Johnson Glacier dome on the NE flank.Steep headwalls on the southern and eastern flanks expose an inaccessible cross-section of the volcano. Several major glaciers radiate from its summit; the 4 largest together contain an estimated volume of 15 cubic km of ice. Eruptions producing pyroclastic flows have been dated at as recent as about 300 and 140 years ago (into the historical period), and elevated seismicity accompanying dike emplacement beneath the volcano was recorded in 1996. 1996-97 earthquake swarms
During 1996-97, dike intrusions under the volcano caused several shallow earthquake swarms, but no eruption. ...plus 1987 steam plume
On the morning of 19 March 1987 at 8am, several pilots observed an unusually large steam plume rising about 1000-1100 m above the summit of Iliamna. The plume originated from an area on the upper S flank vent, but did not contain visible ash. The event is not counted as an eruption, but a period of exceptionally strong degassing from active fumaroles. 1978 steam eruption
A brief steam eruption occurred on 7 November 1978 between 10 and 13 h local time, producing puffs of steam, ejected every 1-5 minutes, that rose an estimated 3 km above the summit. No ash was visible in the steam puffs. No unusual seismic activity was recorded. |
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