लेखक: Richard W. Hazlett

Jack Lockwood worked for the US Geological Survey for over 30 years, including 20 years in Hawaii, based at the Hawaiian Volcano Observatory. He now runs a consulting business, Geohazards Consultants International. Richard (Rick) Hazlett is Coordinator of the Environmental Analysis Program and a member of the Geology Department at Pomona College in Claremont, California, where he teaches an upper-level course in physical volcanology.