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The deepest sections of the Philippine Sea plate cause earthquakes as deep as 675 kilometres (419 mi) below the surface. [8] Notable deep-focus earthquakes in this region include a M w 7.7 earthquake in 1972 and the M w 7.6, 7.5, and 7.3 2010 Mindanao earthquakes.
Modern seismic arrays use more complicated earthquake location techniques. At teleseismic distances, the first arriving P waves have necessarily travelled deep into the mantle, and perhaps have even refracted into the outer core of the planet, before travelling back up to the Earth's surface where the seismographic stations are located.
A pie chart comparing the seismic moment release of the three largest earthquakes for the hundred-year period from 1906 to 2005 with that for all earthquakes of magnitudes <6, 6 to 7, 7 to 8, and >8 for the same period. The 2011 Japan quake would be roughly similar to Sumatra. Earthquakes of magnitude 8.0 and greater from 1900 to 2018.
Blue's Clues Kindergarten is a Windows and Macintosh PC video game distributed on CD-ROM. [2] Based on the television series Blue's Clues , kids can learn different skills that will help them get ready for grade school.
Modern earthquake location still requires a minimum of three seismometers. Most likely, there are many, forming a seismic array. The emphasis is on precision since much can be learned about the fault mechanics and seismic hazard , if the locations can be determined to be within a kilometer or two, for small earthquakes.
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