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once thought to occur when pressure gets to much, volcanologists are now linking orbital effects to eruptions, earthquakes and tsunamis due to the gravitational disturbance when the moon and sun are in certain alignments at at certain points of the earth.

one country, has a saying of 'after the eclipse, wait for the earthquake' and it has never failed to be wrong.

According to the now generally accepted "plate-tectonics" theory, scientists believe that the Earth's surface is broken into a number of shifting slabs or plates, which average about 50 miles in thickness. These plates move relative to one another above a hotter, deeper, more mobile zone at average rates as great as a few inches per year. Most of the world's active volcanoes are located along or near the boundaries between shifting plates and are called "plate-boundary" volcanoes. However, some active volcanoes are not associated with plate boundaries, and many of these so-called "intra-plate" volcanoes form roughly linear chains in the interior of some oceanic plates. The Hawaiian Islands provide perhaps the best example of an "intra-plate" volcanic chain, developed by the northwest-moving Pacific plate passing over an inferred "hot spot" that initiates the magma-generation and volcano formation process. The peripheral areas of the Pacific Ocean Basin, containing the boundaries of several plates, are dotted by many active volcanoes that form the so-called "Ring of Fire." The "Ring" provides excellent examples of "plate boundary" volcanoes, including Mount St. Helens.

2007-11-03 16:40:00 · answer #1 · answered by ? 4 · 0 0

Interestingly- "Hot Spots" are NOT associated with tectonic plate boundaries at ALL! They seem to be permanent "hot" spots BENEATH the tectonic plates- that keep burning through the plates & forming Volcanoes as the Plates slide over them. The Hawaiian chain of volcanoes is a PERFECT example of this- as you can see millions of years of this process in the long chain of aging volcanos that stretch away to the NW from the newest one on the big Island of Hawaii. It's pretty cool! :)

2007-11-03 16:45:21 · answer #2 · answered by Joseph, II 7 · 1 0

sundown Crater isn't at a plate boundary. that's close to flagstaff AZ it is nowhere close to any plate limitations i understand off. that's a cinder cone volcano maximum in all probability led to by technique of a warm spot that's a community of higher warmth contained in the molton rock of the Mantle.

2016-10-23 08:49:52 · answer #3 · answered by ? 3 · 0 0

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