09-August-2006, 02:01 PM
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Senior Member
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Join Date: Apr 2004
Location: Wyoming, NY
Posts: 445
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Perhaps because of this?:
http://vulcan.wr.usgs.gov/Outreach/A...volcanoes.html
Quote:
Few realize that the solid earth also exhibits tidal behavior with bulges on opposite sides of the globe, also driven by the moon. At HVO, we can actually measure these tides with our tiltmeters and strainmeters. The earth's surface tilts up to 0.03 microradians in response to the apparent passage of the moon overhead. A tilt of one microradian is the tilt of a solid bar one kilometer (0.6 miles) long with one end raised by the thickness of a dime. To emphasize how small the tidal tilts are, our tiltmeters automatically alert us to the possibility of volcanic activity when tilts change more than 0.5 microradians in 5 minutes.
Who would have thought that the moon had that kind of power, not only to be able to cause the world's oceans to bulge, but also to squeeze terra firma twice a day? But it does, so it should not come as a complete shock that reputable scientists have suggested that these squeezings might influence whether a volcano will erupt or not.
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