Nature
Alagogshak is a stratovolcano on the Alaska Peninsula in Katmai National Park and Preserve and the oldest volcano in the immediate Valley of Ten Thousand Smokes group. It erupted during the Pleistocene, from about 680,000 years ago until roughly 43,000 years ago, but is no longer active, making it unique within the Katmai volcanic group. Its original shape has been deeply eroded, leaving a remnant summit crater of hydrothermally altered rock. The younger Holocene volcano Mount Martin rises partly on Alagogshak’s eroded edifice nearby. Alagogshak was only identified as distinct from Mount Martin in 1997, and its informal name comes from nearby Alagogshak Creek.
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King Salmon, Alaska · United States
