Natural Disaster Flashcards
How much more energy does a ML = 8 earthquake release than a ML = 6 earthquake?
1000 times
Stations A records the body waves of an earthquake and find that the waves that arrive first come at a speed of 7 km/s and the second waves that follow immediately arrive at a speed of 4 km/s. The time delay between these wave arrivals is 10 seconds at the station A. what is the distance d of the epicenter from this measuring station?
Around 93.3 km
Station A records the body waves of an earthquake and finds that the resulting P waves arrive at a speed of 10 km/s and the resulting S waves arrive at a speed of 5 km/s. The P waves arrive at 12:13:13 AM and the S waves arrive at 12:13:38 AM. What is the distance (in kms) of the epicenter from station A?
250
How much more energy does a ML = 5 earthquake release than a ML = 2 earthquake?
~31,600
Which of the following is false?
a) P waves travel faster than S waves.
b) S waves are more destructive than P waves.
c) P waves are compression waves and travel in a push-pull action.
d) S waves are surface waves.
D
Which of the following is false?
a) Shared geologic features and rock types across distant continents represent evidence that was used to support both continental drift and plate tectonics.
b) Glossopteris is a fossil fern with an incredibly broad geographic distribution suggesting continental land masses were once much closer together.
c) The lithosphere is made entirely of oceanic crust.
d) Seafloor spreading is a process that helps to differentiate plate tectonics from continental drift.
C
Which of the following sequences correctly lists the different arrivals from first to last?
a) Surface waves … P waves … S waves
b) P waves … Surface waves … S waves
c) P waves … S waves … Surface waves
d) S waves … P waves … Surface waves
C
In general, the most destructive earthquake waves are the __________ .
Surface waves
Body waves consist of which two types of waves
P waves and S waves.
How do rock particles move during the passage of a P wave through the rock?
a) in a rolling circular motion
b) back and forth perpendicular to the direction of wave travel
c) back and forth parallel to the direction of wave travel
d) the particles do not move
C
How many seismograph stations are needed to confidently locate the epicenter of an earthquake?
3
How much more energy does a ML = 8 earthquake release
than a ML = 4 earthquake?
1 million
How much more energy does a ML = 7 earthquake release than a ML = 5 earthquake?
1000
For example, if the P wave velocity is 6 km/s, and the S wave velocity is 4 km/s (these are typical values), and there is a 5 second delay between the P and S waves
60km
Stations A records the body waves of an earthquake and finds that the resulting P waves arrive at a speed of 8 km/s and the resulting S waves arrive at a speed of 4 km/s. The P waves arrive at 12:13:20 AM and the S waves arrive at 12:13:35 AM. Calculate the distance d of the epicenter from station A.
120 km
