I can understand clocking the speed of surface movement, but how is it determined how fast the mantle beneath the plate is moving (re: Nazca plate)?
This is a good question and I'm not sure of the answer. Can anyone else help out here?
I can understand clocking the speed of surface movement, but how is it determined how fast the mantle beneath the plate is moving (re: Nazca plate)?
Have you read it, Stripe?You could try reading the thread for a start.
Therefore, something. :idunno:In this video, the horizontal motion of GPS station NAST, located in Kathmandu, Nepal is displayed for the 25 April 2015 Mw 7.8 Gorkha, Nepal earthquake. The inset is a youtube video from a stationary camera of the ground motion experienced by a crowd of people in an open square in Kathmandu, Nepal. The back and forth motion seen in the crowd and the GPS station shows the basin resonance:
Good grief.Therefore, something. :idunno: