Available Weekly Reports
There are no activity reports for Akademia Nauk.
Summary of eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|1996 Jan 2||1996 Jan 3||Confirmed||3||Historical||North margin of Karymsky Lake|
|950 BCE (?)||Unknown||Confirmed||Radiocarbon (corrected)||North of Karymsky Lake, Tephra layer SC|
|3850 BCE (?)||Unknown||Confirmed||Radiocarbon (corrected)||North of Karymsky Lake (Lagerny cone)|
|5500 BCE ± 500 years||Unknown||Confirmed||3||Radiocarbon (corrected)||N margin of caldera lake (Karymsky maar)|
The scenic lake-filled Akademia Nauk caldera is one of three volcanoes constructed within the mid-Pleistocene, 15-km-wide Polovinka caldera. Beliankin stratovolcano, in the SW part of Polovinka caldera, is eroded, but has been active in postglacial time (Sviatlovsky, 1959). Two nested calderas, 5 x 4 km Odnoboky and 3 x 5 km Akademia Nauk (also known as Karymsky Lake or Academii Nauk), were formed during the late Pleistocene, the latter about 30,000 years ago. Eruptive products varied from initial basaltic-andesite lava flows to late-stage rhyodacitic lava domes. Two maars, Akademia Nauk and Karymsky, subsequently formed at the southern and northern margins of the caldera lake, respectively. The northern maar, Karymsky, erupted about 6500 radiocarbon years ago and formed a small bay. The first historical eruption from Akademia Nauk did not take place until January 2, 1996, when a brief, day-long explosive eruption of unusual basaltic and rhyolitic composition occurred from vents beneath the NNW part of the caldera lake near Karymsky maar.