Keiiti Aki now resides on R�union Island in the Indian Ocean, after a distinguished career that included faculty appointments for many years at the Massachusetts Institute of Technology and the University of Southern California. He carries out research on volcano seismology and maintains a vigorous schedule of global travel and lecturing.

Paul Richards has taught and conducted research for many years at Columbia University's Lamont-Doherty Earth Observatory, where his work has turned to methods of monitoring earthquakes and underground nuclear explosions. His current research is focused on improving the accuracy with which earthquakes and explosions are routinely located around the world.

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ThriftBooks is a fully independent seller of used books, having sold more than 160 million used and new books since we started in 2003. Each quality used book is sorted, graded, shelved and shipped by hand by our team of dedicated employees in our seven warehouses across the US. We have the best selection of books, in the right condition and format, at everyday low prices. We also have a dedicated, US-based Customer Service team, ranked in the top three by Newsweek for Best Customer Service in 2018 and 2019, so you can shop with confidence. We support and invest in our employees, appreciate and value our customers, and truly believe in the power of the written word to educate, energize, and engage readers of all ages and interests.

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