When horrific events of such magnitude happen people very often will focus on one small thing they can actually deal with. I've seen people after a tornado searching the rubble of their houses for little keepsakes like family photo albums. Something comforting to do amidst the chaos.
USGS scientists say massive force of quake moved island 8 feet east
By The Denver Post
Posted: 03/12/2011 01:00:00 AM MST
The quake Friday occurred in what is called a subduction zone, where one of the Earth's tectonic plates is sliding beneath another. In this case, the Pacific plate is sliding beneath the North American plate at a rate of about 3 inches a year.
The earthquake occurred at a depth of about 15 miles. Although relatively shallow by global standards, that is about normal for quakes in this zone, said Emily So, an engineer with the U.S. Geological Survey in Golden.
So said that based on her agency's calculations, the quake was of magnitude 8.9.
According to USGS scientist Brian Atwater, "The energy radiated by this quake is nearly equal to one month's worth of energy consumption" in the United States.
the force of the earthquake was so strong that it moved the Japanese island of Honshu 8 feet to the east, said USGS geophysicist Ken Hudnut.
It also sped up the Earth's rotation by 1.6 microseconds, according to NASA.
In a subduction quake that occurs underwater, as this one did, the sudden movement of a portion of one of the plates can displace enormous amounts of water, triggering a tsunami. As the tsunami waves approach shallow coastal areas, they tend to increase in height.
The devastation often comes from a succession of waves, with the first few being relatively small. The waves can propagate across oceans at speeds of 500 mph or greater.
With Friday's quake occurring only about 80 miles offshore, people in the closest coastal areas would not have had much time to evacuate.
Loma Prieta still gives me nightmares about the roof falling on me in my sleep, and I was way up at Donner Lake when that hit. Just can't imagine how it would feel to see my whole town go floating by on a tsunami wave. Maybe I'd just want to think about my snakes...
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Bob
Pyromaniac AKA Greatballzofire
Keeping cats allows man to cohabitate with tigers. Keeping reptiles allows man to cohabitate with dinosaurs.