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First , each volcano has significant differences in the type , size , and frequency of past eruptions . As the number of refugees topped one million , Indonesian President Yudhoyono described the event as the worst disaster to hit his country since the eruption of Krakatoa more than 100 years ago . This indicates that the correlation between style of eruption and variables such as volume of erupting magma and rates of effusion from the vent can blur the effects of spreading rate on eruptive styles - - indeed eruptive styles can be similar at times between fast - and slow-spreading ridges and different between ridge segments with the same spreading rate . Perhaps this latest eruption of pseudo-intellectual snobbery is a result of Nicholas Baker 's relentless , years-long attack on librarians and anything to do with updating libraries . GG 601 Explosive Volcanism ( 3 ) Explosive volcanic eruptions : from causes to consequences . The council also approved a resolution expressing concern over the fate of residents of the Caribbean island of Montserrat who are threatened by ongoing eruptions from the Soufriere Hills volcano . Events associated with the 1868 M7.9 earthquake are shown with eruptions in red and earthquakes in yellow . The close correspondence between the beginning of the CAMP eruptions and the mass extinction suggests that the global disruption caused by a long series of volcanic eruptions could have set off or at least exacerbated the die-off . An international team of scientists has presented its findings from the first observations of the eruption of a submarine volcano that in 2004 and 2005 spewed out plumes of sulfur-rich fluid and pulses of volcanic ash 550 meters below the ocean 's surface near the Mariana Islands northwest of Guam . The transformation of streams by the 1980 eruption was dramatic and significant .