21. What is the name of the fault that caused the 1989 Loma Prieta earthquake in California?
A) San Andreas fault
B) Hayward fault
C) New Madrid fault
D) Cascadia subduction zone
Answer: B) Hayward fault
22. Which type of waves are the first to be detected by a seismograph after an earthquake?
A) S-waves
B) P-waves
C) Surface waves
D) Rayleigh waves
Answer: B) P-waves
23. What is the minimum number of seismographs needed to determine the epicenter of an earthquake?
A) 1
B) 2
C) 3
D) 4
Answer: B) 2
24. What is the name of the scale used to measure the intensity of an earthquake?
A) Richter Scale
B) Mercalli Scale
C) Moment Magnitude Scale
D) Seismic Scale
Answer: B) Mercalli Scale
25. What is the minimum magnitude for an earthquake to be considered a “major” earthquake?
A) 5.0
B) 6.0
C) 7.0
D) 8.0
Answer: C) 7.0
