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Domain: pnsn.org
Stories and comments across the archive that link to pnsn.org.
Stories · 5
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Mount Saint Helens Behaving Oddly
jd writes "According to the New Scientist magazine, Mount Saint Helens has built in the space of a few months a lava dome larger than one that had been built over the previous six years. The growth rate is about four cubic meters a second. If the dome keeps growing at this rate, geologists expect it to collapse, triggering a major eruption. Surface activity is not the only thing geologists are monitoring. Seismographs of the volcano show dozens of tremors a minute." -
Mount St. Helens Alert Status Increased
DarkHand writes "Mount St. Helens has become even more unstable in the last few hours. The U.S. Geological Surveys Cascades Volcano Observatory has increased the volcanic alert around the volcano to level 2 and released a press release: 'Over night, seismic activity at Mount St. Helens has accelerated significantly, which increases our level of concern that current unrest could culminate in an eruption. We are increasing the alert level to the second of three levels [...]. Earthquakes are occurring at about four per minute. The largest events are approaching Magnitude 2.5 and they are becoming more frequent. All are still at shallow levels in and below the lava dome that grew in the crater between 1980 and 1986. This suggests that the ongoing intense earthquake activity has weakened the dome, increasing the likelihood of explosions or perhaps the extrusion of lava from the dome.' The most recent readings at the SEP seismograph stationed on the lava dome itself are totally saturated. The ground is now literally constantly rumbling." -
Mount St. Helens Alert Status Increased
DarkHand writes "Mount St. Helens has become even more unstable in the last few hours. The U.S. Geological Surveys Cascades Volcano Observatory has increased the volcanic alert around the volcano to level 2 and released a press release: 'Over night, seismic activity at Mount St. Helens has accelerated significantly, which increases our level of concern that current unrest could culminate in an eruption. We are increasing the alert level to the second of three levels [...]. Earthquakes are occurring at about four per minute. The largest events are approaching Magnitude 2.5 and they are becoming more frequent. All are still at shallow levels in and below the lava dome that grew in the crater between 1980 and 1986. This suggests that the ongoing intense earthquake activity has weakened the dome, increasing the likelihood of explosions or perhaps the extrusion of lava from the dome.' The most recent readings at the SEP seismograph stationed on the lava dome itself are totally saturated. The ground is now literally constantly rumbling." -
Mt. St. Helens' Grumbling May Presage Eruption
stand writes "The Seattle Times is reporting (press release here) that scientists believe that there is a 'significant chance of a small eruption of Mt. St. Helens in the days or weeks ahead.' There have been a series of earthquakes at the site in the last few days. I think it's about time Washington state took over the natural disaster coverage from Florida, don't you?" -
Possible 'Hazardous Event' At Mount St. Helens
babynerd writes "Seismologists believe there's an increased likelihood of a hazardous event at Mount St. Helens due to recent changes in the mountain's seismic activity. That increased activity on Sunday prompted the U.S. Geological Survey and the University of Washington to release a "notice of volcanic unrest.""