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US Volcanoes: Blasts from the Past?

Posted by feww on February 27, 2011

Speaking of Volcanism in the U-S

Based on the rising rate of global volcanism, volcanic activity in the mainland U-S may be overdue

Mt Adams

Source:  Mt Adams Seismicity

“Mount Adams, one of the largest volcanoes in the Cascade Range, dominates the Mount Adams volcanic field in Skamania, Yakima, Klickitat, and Lewis counties and the Yakima Indian Reservation of south-central Washington. The nearby Indian Heaven and Simcoe Mountains volcanic fields lie west and southeast, respectively, of the 1,250 square kilometers (500 square miles) Adams field. Even though Mount Adams has been less active during the past few thousand years than neighboring Mounts St. Helens, Rainier, and Hood, it assuredly will erupt again. Future eruptions will probably occur more frequently from vents on the summit and upper flanks of Mount Adams than from vents scattered in the volcanic fields beyond. Large landslides and lahars that need not be related to eruptions probably pose the most destructive, far- reaching hazard of Mount Adams. The purpose of these maps and booklet is to (1) describe the kinds of hazardous geologic events that will likely occur in the future at Mount Adams and at other volcanoes in the region, (2) outline the areas that will most likely be affected by these events, and (3) recommend actions that individuals and government agencies can take to protect lives and property. — Scott,, 1995″ Source: Volcano Hazards in the Mount Adams Region, Washington

Click image to enlarge.

SP Crater, The San Francisco Volcanic Field, N Arizona

The San Francisco Volcanic Field, home to about 600 volcanoes, lies in northern Arizona covering about 4,700 km². This photo-like image  of  the volcanic field featuring SP Crater and lava flows was acquired by ALI on NASA’s EO-1 satellite on April 17, 2010. “Forming a paisley pattern, the dark volcanic rocks north of SP Crater result from lava flows. (This image has been rotated and north is at right.) The hardened lava extends some 4 miles (6 kilometers) from the cinder cone, and is about 100 feet (30 meters) thick. Different dating techniques have placed the age of this lava between 4,000 and 71,000 years old.” Source: NASA-EO. Click image to enlarge. Download large image (4 MB, JPEG)

Volcanoes NOT shown on the maps above include:

  • Dotsero (CO, 2500 BC)
  • La Garita Caldera  (CO)
  • Soda Lakes (NV, Holocene)
  • Steamboat Springs (NV, Pleistocene-Fumarolic)
  • Bald Knoll  (UT, Holocene)
  • Fumarole Butte  (UT, 650,000 years ago?)
  • Pavant Butte  (UT, Holocene?)
  • Santa Clara  (UT, N/K)

Related Links:

Related FEWW Links:

FEWW Volcanic Activity Forecast

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