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Scientists say the deformity is caused by pressure from magma that is fitfully working its way toward the surface and a probable eruption. They say all the events of the last two weeks — earthquakes, harmonic tremors, ash explosions and steaming inside the crater — are likely leading up to such an event.
scientists are calling this uplifted area "the Loaf".
Originally posted by sanctum
These graphs are going crazy.
Well... there haven't been any bigger eruption after St. Helens so there might be need to release some pressure... it's just pretty impossible to say when and where exactly it happens, just like with earthquakes... until "last minute" (at least in geological timescale)
Originally posted by HarmoniusOne
However, if you look at the activity over the past week or so, some show shakes when MSH is active, some when she's quiet. Mt Constitution never even hiccupped through all of this and then yesterday started shaking and hasn't stopped.
An interesting variation of a composite volcano can be seen at Crater Lake in Oregon. From what geologists can interpret of its past, a high volcano -- called Mount Mazama -- probably similar in appearance to present-day Mount Rainier was once located at this spot...
The cataclysmic eruption of Mount Mazama 7,700 years ago started from a single vent on the northeast side of the volcano as a towering column of pumice and ash that reached some 30 miles (50 km) high. Winds carried the ash across much of the Pacific Northwest and parts of southern Canada. So much magma erupted that the volcano began to collapse in on itself. As the summit collapsed, circular cracks opened up around the peak. More magma erupted through these cracks to race down the slopes as pyroclastic flows. Deposits from these flows partially filled the valleys around Mount Mazama with up to 300 feet (100 m) of pumice and ash. As more magma was erupted, the collapse progressed until the dust settled to reveal a volcanic depression, called a caldera, 5 miles (8 km) in diameter and one mile (1.6 km) deep.
Originally posted by Valhall
And the "loaf" has risen another 10 to 30 feet in the past 24 hours! AND NOW IT'S STICKING UP HIGHER THAN MSH'S DOME ITSELF!!!!
Originally posted by HarmoniusOne
The whole ring of fire is acting up. There is volcanic and seismic activity from Alaska to Mexico on the US side of the ring. Mt Spurr (alaska) has a large pit on its face caused by the melting of the ice and snow from beneath the surface. And there is a volcano erupting in Mexico. Wish I could remember the name right now. Not to mention the 100+ eartquakes that have happened along the west coast this week. Interestingly enough, the media and govt are still saying, "There's nothing to worry about". I've been keeping an eye on the PNSN for the past two weeks and there has been activity at Mt Ranier, Mt Hood, Three Sisters, Haystack Peak, Dodson Butte, Moon Mtn, etc, along with Mt St Helens. When exactly will "they" give us some credit and tell us the truth???
i recall once hearing about asteroids that will impact us and we spawned 2 movies off of it and we had all kinds of panic for a day or two and the government openly admitted that they wont tell us next time and the last risk was miscalculted,, sounds the same to me,, downplay the risk, keep going about your lives,,pray nothing happens and if it does claim ignorance
"What's happened in the last day is the magma is not just pushing up but pushing out. We no longer have just isolated vents. Instead the whole area is pushing up, the gas is the fuse, just oozing out," John Pallister, a U.S. Geological Survey geologist, said at a news conference yesterday afternoon.
Fast-moving magma would cause greater concern because explosive gases wouldn't have time to dissipate. A team in Denver is evaluating air photos, comparing pictures of the changing lava dome to gauge how fast the magma is rising.
"Rapid ascent is very dangerous, whereas if it rises slowly the magma has a chance to degas and then it would just ease its way out," Pallister said.