Thick smoke plume over Semisopochnoi, Alaska
Sentinel-1 CSAR IW acquired on 14 April 2021 at 05:44:49 UTC
Sentinel-3 OLCI FR & OLCI FR acquired on 15 April 2021 from 22:08:19 to 23:09:47 UTC
...
Sentinel-5P TROPOMI SO2 acquired on 19 April 2021 at 00:32:57 UTC
Sentinel-2 MSI acquired on 22 April 2021 at 23:15:49 UTC
Sentinel-3 OLCI FR & OLCI FR acquired on 15 April 2021 from 22:08:19 to 23:09:47 UTC
...
Sentinel-5P TROPOMI SO2 acquired on 19 April 2021 at 00:32:57 UTC
Sentinel-2 MSI acquired on 22 April 2021 at 23:15:49 UTC
Keyword(s): Geohazard, natural disaster, volcano, island, atmosphere, biodiversity, arc, Pacific Ring of Fire, United States, USA
Semisopochnoi is located near the confluence of the Aleutian Arc and Bowers ridge. It is the largest subaerial volcano of the western Aleutians while its summit is 1221m above the sea. It is bigger and higher and taking into account its base on the seafloor.
The island contains a caldera 8 km wide that formed as a result of collapse of a low-angle volcano following a large eruption.
In total, Semisopochnoi supports well over a million seabirds, most of which are least auklets or crested auklets. While the island has remained free of Norway rats, most ground-nesting bird species and most burrow-nesting seabirds were extirpated by foxes after their introduction during the 19th century. The fox populations have since been removed.