Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
The energy that drives plate tectonics is
|
internal heat energy
|
|
The difference in time between the arrival of the P-wave and S-wave always tells you....
|
the distance to the focus of the quake
|
|
Approximately how large would an earthquake be if the strong shaking lasts for 1 minute?
|
8
|
|
Large magnitude 9 earthquakes occur exclusively along what type of plate boundary?
|
subduction zones
|
|
A magnitude 6 earthquake releases_________ as much energy as a magnitude 4?
|
1000 times
|
|
Which of the following is not used to determine the RICHTER magnitude?
|
duration of S-wave shaking
|
|
Which of the following statements is true about seismic waves
|
S-waves travel slower than P-waves.
|
|
The Modified Mercalli scale would be least helpful in determining the...
|
moment magnitude of an earthquake
|
|
If a seismic waves move from bedrock into softer layers of a sedimentary basin like Los Angeles, the waves will...
|
slow down, increase in amplitude, decrease the duration of
|
|
The magnitude of an earthquake can be quickly estimated because...
|
the duration of shaking correlates with the magnitude
|
|
Which of the following quakes would likely kill the most people?
|
7.2M, 25 km depth, Istanbul, Turkey (very high pop, poor construction)
|
|
Reverse faults or thrust faults would be associated with which of the following....
|
continental collision zones
|
|
What geologic activity would be associated with a right bend in a right lateral fault?
|
basin formation with normal faults
|
|
Which of the following is used to calculate the MOMENT magnitude of an earthquake?
|
the length and depth of the fault rupture
|
|
The big bend of the San Andreas Fault produces these “hidden” types of faults in the Los Angeles basin?
|
reverse faults
|
|
Baja and San Diego are moving northwest at 5cm /year along the San Andreas Fault. How many million years will it take Baja to reach Alaska a distance of 4000 km
|
80
|
|
San Diego is located on the
|
the Pacific Plate
|
|
Which type of building is the least earthquake resistant?
|
MASONRY
|
|
A seismograph records an earthquake. Thirty three seconds after the P-wave arrives, S-waves shaking begins and lasts for twenty seconds. If the seismogram records an S-wave amplitude of 100mm what is the indicated Richter magnitude?
|
6
|
|
How far from the quake is the seismograph located?
|
300km
|