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Release of topographic data currently embargoed by the U.S. Department of Defense ( DOD ) should also be vigorously pursued . Even California , which has fairly rigorous and well-enforced building codes , has suffered devastating long-term economic losses from moderate-size earthquakes in the last five years ( Loma Prieta and Northridge ) . Phytoplasmas are most similar in size and composition to bacteria . The following is summarized from a recent National Academy of Sciences report ( Sea Level Change , NAS , 1990 ) . While many volcanoes experience periods of unrest and deformation that do not culminate in major eruptions , it is likely that many ( perhaps most ) of the world 's volcanoes that actually do erupt experience significant preeruption surface deformation ( Newhall and Dzurisin , 1988 ; Thatcher , 1990 ; Shimada et al ., 1990 ) .