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Assume a crust 35 km thick with a P wave velocity of 6.1 km/sec, overlying a mantle with P wave velocity of 8 km/sec. For an earthquake with hypocenter at 20 km depth: 1) What is the time of arrival of the reflection from the Moho at the surface if you are standing at the epicenter? 2) At a distant station, what would be the time difference between direct P and the reflected phase (pP)? Assume near vertical incidence angle near the source. 3) What is the distance (horizontally from the epicenter) where the head wave starts to show up on seismic stations? 4) What is the time of arrival of the P wave that reflects off the mantle at the same place on the surface (from Q 3) where the head wave starts to appear?

Assume a crust 35 km thick with a P wave velocity of 6.1 km/sec, overlying a mantle with P wave velocity of 8 km/sec. For an earthquake with hypocenter at 20 km depth: 1) What is the time of arrival of the reflection from the Moho at the surface if you are standing at the epicenter? 2) At a distant station, what would be the time difference between direct P and the reflected phase (pP)? Assume near vertical incidence angle near the source. 3) What is the distance (horizontally from the epicenter) where the head wave starts to show up on seismic stations? 4) What is the time of arrival of the P wave that reflects off the mantle at the same place on the surface (from Q 3) where the head wave starts to appear?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Assume a crust 35 km thick with a P wave velocity of 6.1 km/sec, overlying a mantle with P wave velocity of 8 km/sec. For an earthquake with hypocenter at 20 km depth: 1) What is the time of arrival of the reflection from the Moho at the surface if you are standing at the epicenter? 2) At a distant station, what would be the time difference between direct P and the reflected phase (pP)? Assume near vertical incidence angle near the source. 3) What is the distance (horizontally from the epicenter) where the head wave starts to show up on seismic stations? 4) What is the time of arrival of the P wave that reflects off the mantle at the same place on the surface (from Q 3) where the head wave starts to appear?
Transcribed Image Text:Assume a crust 35 km thick with a P wave velocity of 6.1 km/sec, overlying a mantle with P wave velocity of 8 km/sec. For an earthquake with hypocenter at 20 km depth: 1) What is the time of arrival of the reflection from the Moho at the surface if you are standing at the epicenter? 2) At a distant station, what would be the time difference between direct P and the reflected phase (pP)? Assume near vertical incidence angle near the source. 3) What is the distance (horizontally from the epicenter) where the head wave starts to show up on seismic stations? 4) What is the time of arrival of the P wave that reflects off the mantle at the same place on the surface (from Q 3) where the head wave starts to appear?
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