Passage I
Earthquakes produce seismic waves that can travel long distances through Earth. Two types of seismic waves are p-waves and s-waves. P-waves typically travel 6-13 km/sec and s-waves typically travel 3.5-7.5 km/sec. Figure 1 shows how p-waves and s-waves move and are refracted (bent) as they travel through different layers of Earth’s interior. Figure 2 shows a seismograph (an instrument that detects seismic waves) recording of p-waves and s-waves from an earthquake. Figure 3 shows, in general, how long it takes p-waves and s-waves to travel given distances along the surface from an earthquake focus (point of origin of seismic waves).
1. Figure 1 shows that a seismograph located at a point 125° around Earth from an earthquake’s focus would receive which type(s) of seismic waves, if either, from that earthquake?
Your Answer is
Correct Answer is D
Explanation
Look at figure 1, the 125° given in the question stem is between 103°-142°, this range is shadow zone: neither p-waves nor s-waves received at seismograph