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2021 Map of Umnak B-1 NE, 2021 Print
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2021 Map of Umnak B-1 NE

USGS Topo · Published 2021

About this map

Okmok Caldera dominates the center of this 2021 topographical study, revealing the stark volcanic architecture of Umnak Island. This segment of the Aleutians West Census Area highlights the massive circular depression of the caldera, a feature formed by the collapse of a volcano. The surrounding landscape is defined by its dramatic elevation changes, notably along the North Arcuate Ridge and East Arcuate Ridge, which form partial rims around the central basin. To the south, the terrain rises toward the peak of Tulik Volcano, one of the prominent vents associated with the Okmok complex. The map provides a high-resolution look at the drainage patterns and tephra-strewn slopes of this active geothermal area, documenting the raw geological forces that continue to shape the Aleutian arc.

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Map Details

Date Portrayed2021
Date Published2021
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:25,000
Physical Dimensions24 x 29 inches

Editions of this 2021 Umnak B-1 NE Map

This is the sole edition of this map. No revisions or reprints were ever made.

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain