HW#1_Interior_Earth_

Name Kennedy Gofourth ENVI 170, Fall 2023: Homework #1 – 27 points Copyright 2022 [Chad L. Yost]. All rights reserved. The plot on the right shows seismograms associated with the March 11, 2011 Tohoku Earthquake (Japan) that created a devastating tsunami. Arrival times (in minutes) of the marked P- and S- waves are given on the top y-axis. The seismograph stations are plotted on the x-axis by their distance from the epicenter. These distances are given in degrees rather than miles or kilometers. We can think of the Earth as a circle (360° all the way around) and the earthquake epicenter is 0°. (1) In the boxes below, label the angles on the circle (click the boxes) . Hint: the three angles on the left side are the same as on the right. [6 pts] Use these labels & points for Q#2: Useful background info: If a wave passes into a material with a higher seismic velocity , it will bend toward the boundary. If it passes into a material with a lower seismic velocity , it will bend away from the boundary. P-waves are able to move through solids, liquids and gases. S-waves only move through solids. P-waves always travel faster than S-waves . After an earthquake, the P-waves will always arrive at a seismograph before S-waves. 45 90 135 180 135 90 45 x MAJO GUMO LSA KIP KIEV WCI GTB Y