National Oceanic and
Atmospheric Administration
United States Department of Commerce


This is now the world's largest volcano, geologists say

In 2013, a team of scientists rocked geology fans when they reported that Mauna Loa, a 2,000-square-mile shield volcano in Hawaii, was probably not in fact the largest volcano in the world. That accolade, the team suggested, belonged to Tamu Massif, an extinct volcanic mountain on the seafloor east of Japan that appeared to be a single shield volcano covering a whopping 100,000 square miles, roughly the same size as the state of Arizona. Bill Chadwick is quoted. 


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