POTENTIALLY ACTIVE VOLCANOES
DEFINITION:
That is the definition of active used by the Global Volcanism Program in their catalogs. A dormant volcano would then be one that hasn't erupted in the past 10,000 years, but which is expected to erupt again. An extinct volcano would be one that nobody expects to ever erupt again.
America Has a Whole Lot of Potentially Active Volcanoes
The Valles Caldera, near Los Alamos in New Mexico, seen from Landsat 7 in May 2002. NASA EARTH OBSERVATORY
Mt. Konocti, on the shores of Clear Lake in California. ERIK KLEMETTI
Layers of volcanic debris next to a basaltic lava flow at Dotsero in Colorado. Jeffrey Beall / Flickr | CC-by-SA 2.0
Markagunt Plateau, part of the Black Rock Desert volcanic field in Utah. LEE SIEBERT, USGS/SMITHSONIAN INSTITUTE
A streak of older ash remobilized by strong winds on the summit of Wrangell in Alaska. Seen in 2007. NORMA TRAW/ USGS/AVO
The snow-covered Kookooligit Mountains on St. Lawrence Island in Alaska. Seen by Landsat 8 on June 17, 2015. USGS-NASA (PROCESSED BY ROB SIMMON)
Malheur Maar (right) and pahoehoe lava (left) in Diamond Craters, located in central Oregon. IAN POELLET / WIKIMEDIA COMMONS | CC-BY-SA 4.0
Solidified lava flows (dark grey) pouring over red sandstone cliffs, part of the Uinkaret Volcanic Field of Arizona. DOC SEARLS / FLICKR | CC BY 2.0
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reference:
https://www.wired.com/2015/07/america-whole-lot-potentially-active-volcanoes/