Mount Spurr lies some 80 nm (150 km) due west from Anchorage. It is a stratovolcano that is visible on most days across Cook Inlet and lies on the Alaska Range. The mountain is 9,800’ (3,000 m) high and is topped with a 3 by 4 nm (5 by 6 km) caldera. The active vent…
In August 2008, a small volcanic island in the central Aleutians erupted for a day. The eruption was a VEI 4, resurfaced the island with pyroclastic flows, increased the area of the island by around 40%, and killed almost everything living on it. Pyroclastic flows entered the surrounding sea and buried kelp beds surrounding most…
Situated on the Cascade plateau, the region known as the Tumalo Volcanic Center was active in the Pleistocene epoch with explosive eruptions between 700,000 and 170,000 years ago that left extensive pyroclastic deposits on which basaltic and basaltic andesitic lava flows formed a great number of shields. One of these eruptions resulted in tephra deposits as…
The Caribou was standing on the plains 30 kilometers away from the mountain; it had not fled the roaring mountain more than that. After all, the ash was driven by the fierce wind to the north, and where it stood to the west in the early summer morning it was only a spectacular view. It…
The more you read about volcanism in North America, the more confused you become by the immense complexity of eruptive phenomenae and sequences. As will be clear from my last article about Mount Tehama (Lassen), it is never the question about a single central volcano such as Vesuvius or Etna, but about a multitude of…
VolcanoCafé 
You must be logged in to post a comment.