This volcanic arc delineates the boundary between the Pacific ... composed of the deep Aleutian Trench coupled with a landward line of volcanoes, creates a series of offshore islands (the ...

This process creates island arc volcanoes like those ... "We understand the connections between seawater strontium and island arc volcanic rocks only in a general way, but the correlations found ...

Mount Spurr, located about 75 miles West of Anchorage, has been acting up in recent weeks, prompting officials at the U.S. Geological Survey and Alaska Volcano Observatory to issue a yellow alert.