Moho Motion: How the Atlantic Widens, by C. James Blom
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Moho Motion: How the Atlantic Widens, by C. James Blom
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Description of Moho Motion These are the musing and sketchings of an old geologist informally proposing how the Atlantic Ocean gets wider. Laymen: this is pitched to you. Geoscientists: your initial knee-jerk reaction might be "blithering blasphemy"! Later these ideas may grow on you. One hundred fifty+ million years ago the Atlantic was a lineup of fresh water lakes, and now it is an ocean 3000 miles wide. Down the middle of the Atlantic a submarine mountain chain overlies miles-thick volcanic rock. Continuing eruptions of volcanic rock below these mountains add an inch a year to the edges of two of the earth's plates which meet there. The Moho is a world-wide interface from 5 to 30 miles below the earth's surface. Velocities of sound are slower above and faster below the Moho. Oceanic crust and continental crust float on the Moho. The material below the Moho is usually stable, but if its confining pressure drops, that material locally transitions to lava. This is a reversible change of state, involving the release of heat when lava is created under the expanding Atlantic, and involving the acquisition of heat by slabs of transitioning oceanic basalt descending hundreds of miles around the edges of the shrinking Pacific. Pressure-depth graphs are essential tools for understanding the new theory. A byproduct of using this discipline is a more detailed interpretation of the May 18, 1980, eruption at Mt. Saint Helens in Washington state.There were two fluid systems in play that day: water and magma. Initially there was a 5.2 earthquake. This triggered a large landslide, which unleashed a massive underground steam explosion, lasting a minute or two. This reduced the pressure restraining the magma (lava), which then erupted.
Moho Motion: How the Atlantic Widens, by C. James Blom- Amazon Sales Rank: #1366561 in eBooks
- Published on: 2015-05-07
- Released on: 2015-05-07
- Format: Kindle eBook
About the Author C. James Blom is a geologist, who earned a BS from Caltech and a PhD from the University Of Innsbruck, Austria. Years of experience in petroleum exploration and production sharpened his curiosity about earth's processes. More than two decades in the making, Moho Motion is the result.
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2 of 2 people found the following review helpful. Five Stars By Joe Student The author is a veritable modern day Merlin for us laymen.
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