How far and how fast does an earthquake measuring 7.9 on the Richter scale travels through a relatively dense? Is there a difference in the speed and distance of continental and oceanic crust ? I would appreciate a series of numbers and backup sources if possible. Thank you !

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Dear friend, now I am in a hill station. Better if you could browse as A.Ganaathy India in Google you will get my best answers. The Richter Scale 7.9 will destruct the places up to a distance of about 500 K/M from epicenter. It all depends upon the geographical condition of that place.The speed of destructive waves will be about 4 k/m per second.Learn from my answers about the behaviours of different waves.When the secondary wave passes through sea it takes enormous time because it gets reflected and refracted several times under crust.

Don't quote me, but I believe no matter what the scale reading, the speed would be the same no matter what the scale number (from point a to point b). The speed it actually travels is dependent on the density of the materials it's traveling through, not how strong the quake was. Just like sound travels the same speed through the same materials, no matter how loud the sound was to begin with. Wave propagation if I remember my high school Earth Science correctly.

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