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PINACATE: There are Indian legends of historical eruptions and at least two questionable reports of possible explosive activity in the early 20th century. The field has 400 volcanic cones and other features documenting an eruption history extending over the past few million years.
Tuesday March 30th, 2010: A magnitude 4.5 earthquake is reported at the south end of the Pinacates volcanic field in Sonora, about 60 miles south of Ajo, Arizona.
