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Originally posted by lurksoften
Anyone notice how far south that eq was from were we normally get them at. Wonder if this could be the start of new activity in a different area than were we are used to getting them?
lobs of solidified magma may have helped control the direction of energy from the 2011 Virginia earthquake, according to early results from an airborne geologic survey conducted in July 2012. "If you look to the northeast [from the epicenter], you see that the structures are rather continuous," said Anji Shah, a U.S. Geological Survey research geophysicist and lead scientist for the study. "Whereas if you look to the southwest, you quickly run into a pluton (the solidified magma), so you have an interface of different rock types, which might make the energy a lot less efficient in that direction," she told OurAmazingPlanet. The strongest energy from the Virginia earthquake appeared channeled toward the northeast, in the direction of Washington, D.C., and dissipated to the south, according to the USGS's shake maps. A chunky pluton also sits to the west of the epicenter. A pluton is an underground mass of cooled magma, or igneous rock, that can range in size from a few miles to tens of miles (a couple kilometers to tens of kilometers) in diameter.
Originally posted by piequal3because14
....until today I didn't knew that this thread can be so interesting and useful.
and it is.
Many things to learn from all of you about these earthly phenomena that are earthquakes.
I hope I will understand better about earthquakes by reading all the posts in this thread if and when time will be allowed.
Thank you for this thread.
Originally posted by rickymouse
WOW. Lots of red on the USGS site today. I wonder if a lot of magnets fell off of refrigerators last night Why did the Japanese want to know about magnets falling off of refrigerators anyway, does anyone know what they are looking at?
The Sun is a big magnet.
During solar minimum the Sun's magnetic field, like Earth's, resembles that of an iron bar magnet, with great closed loops near the equator and open field lines near the poles. Scientists call such a field a "dipole." The Sun's dipolar field is about as strong as a refrigerator magnet, or 50 gauss. Earth's magnetic field is 100 times weaker.
Originally posted by muzzy
Russians gave that W of Baja a 6.5Ms and 6.5mb
usgs being tight with their magnitudes again today, only working in mb for some quakes and Mw for others, causes confusion
Fiji 2012 December 14 16:52:38 UTC
emsc have 5.8Mw
usgs and ras have 5.3mb
gfz MTS 5.8Mw
I'd call it a 5.8 for sure
edit on 14-12-2012 by muzzy because: (no reason given)
Re the magnets, since fridge magnets are fairly weak - about the strength of the magnetic field of the sun by the way - they may be looking for demagnetisation of the magnet due to changes in earth's even weaker magnetic field.