is that going to have worse surface impact than the same magnitude at 10 km depth?
I.e. is the magnitude number at the point of origin?
My understanding is that absolutely, yes.
"The strength of shaking from an earthquake diminishes with increasing distance from the earthquake's source, so the strength of shaking at the
surface from an earthquake that occurs at 500km deep is considerably less than if the same earthquake had occurred at 20 km depth."
You bet - my interest in earthquake depth comes from a fascination with tsunamis - since shallow earthquakes are those that generally create tsunamis.
Tsunami-generating quakes will rupture the seafloor, or are close enough to physically disrupt the seafloor.
So when there's news about a quake somewhere underwater, my first thought is "how deep was it?" - although depth alone doesn't necessarily forebode a
tsunami.
The huge Japan tsunami was from a quake about 30km deep, which caused a massive rupture and displacement at the seafloor where it jumped up as much as
20-26 feet along a 110 mile long section... !!! Boggles the mind!mtgoat666 - 8-18-2020 at 12:34 PM
