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Originally posted by TrueAmerican
So now a 5.9 (JMA says 6.1) hits as the activity appears to make its way further inland, indicated by the circled area:
Originally posted by jadedANDcynical
reply to post by TrueAmerican
How does that signal comapre to a slow slip fault? I'm sure you thought of that already but after reading some of the stuff in westcoast's thread it's what lumped out at me.
As far as the low frequency would that be related to the length of a fault line in motion or to the speed at which it is moving?
But last week's tremor changed the coastal landscape — and not just above sea-level. It created a trench in the sea floor 240 miles long (380 kilometers long) and 120 miles wide (190 kilometers wide) as one tectonic plate dove 30 feet (nine meters) beneath another, said Eric Fielding of NASA's Jet Propulsion Laboratory.
While that relieved stress at the breaking point, it appears to have piled pressure onto adjacent segments, said Brian Atwater, a geologist with the U.S. Geological Survey.
That added strain could now trigger a strong, deadly aftershock on Tokyo's doorstep.
"We believe ... the faults which bound the fragment were brought closer to failure by the magnitude-9 quake," Ross said.
Underwater the sea is separated into the Japan Basin to the north, the Yamato Basin to the southeast, and the Tsushima Basin to the southwest. While a narrow continental shelf fringes Siberia and the Korean Peninsula, on the Japanese side of the sea there are wider continental shelves, as well as groups of banks, troughs, and basins lying offshore. The banks lying off the coasts of Japan are divided into groups, which include Okujiri Ridge, Sado Ridge, Hakusan Banks, Wakasa Ridge, and Oki Ridge.
Japan sits near one of the deepest trenches in the world. “Japan Trench, deep submarine trench lying east of the Japanese islands, in the floor of the western North Pacific Ocean. It is one of a series of depressions stretching south from the Kuril Trench and the Bonin Trench to the Mariana Trench. The 27,929-foot (8,513-metre) Tuscarora Deep (north) was once considered the deepest point in the world (subsequently found to be in the Mariana Trench).
Whirlpool is a circular current of water with a depression in its center into which objects may be drawn and sucked down. A small whirlpool is sometimes called an eddy. A whirlpool is formed when an obstruction hinders the normal flow of a current or when water is stirred, such as when an oar is pulled through it.
Originally posted by StarLightStarBright2
omg Japan just had 2 more 6.6 quakes.....Are these close to the one plate you said would be bad?