All fault motion is predominately up and down (dip-slip).
False
The motion on a strike-slip fault has a strong up-down component.
False
The fact that there are areas within the Earth that do not let S-waves pass tells us that:
those areas contain liquid
When P-waves travel from left to right, the material through which the waves travel:
also moves from left to right
The difference between P- and S-wave first arrival times is the key information used to locate the epicenter of an earthquake.
True
The bending of seismic waves, as they pass from one material to another is known as:
seismic refraction
The motion on a dip-slip fault has a strong up-down component.
True
In 4 minutes, a P-wave will travel roughly_________ from the epicenter of an earthquake.
2000 km
Which seismic wave travels the fastest through solid rock?
P-waves
How long would it take for an S-wave to arrive at a seismograph located 1000 km from the epicenter of an earthquake. Note that the X-axis of the graph goes from 0 to 10,000 km (1x103 = 1000). Choose the answer that is closest to being correct.
4 minutes
How long would it take for an S-wave to arrive at a seismograph located 5800 km from the epicenter of an earthquake. Note that the X-axis of the graph goes from 0 to 10,000 km (1x103 = 1000). Choose the answer that is closest to being correct.
16.5 minutes
An P-wave arrives at a seismograph 2 minutes after an earthquake. Estimate the distance to the epicenter from the graph above. Note that the X-axis of the graph goes from 0 to 10,000 km (1x103 = 1000). Choose the answer that is closest to being correct.
1000 km
A seismograph measures the first S-Wave 9 minutes after the first P-Wave. Use the graph above to estimate distance to the epicenter of the earthquake. Note that the X-axis of the graph goes from 0 to 10,000 km (1x103 = 1000). Choose the answer that is closest to being correct.
7800 km
Assume that a seismograph is located 9000 km from the epicenter of an earthquake. Estimate the time delay between arrival of: 1) the first P-Wave; and 2) the first S-wave. Note that the X-axis of the graph goes from 0 to 10,000 km (1x103 = 1000). Choose the answer that is closest to being correct.
10.2 minutes
Assume that a seismograph located 20 km from the epicenter of an earthquake measures an S-wave with a maximum amplitude of 2 mm. Based on this data, use the nomogram shown above to estimate the Richter Magnitude for this earthquake. Enter your answer with one number to the right of the decimal point (e.g., 4.0 or 6.9).
1.9
Assume that a seismograph located 800 km from the epicenter of an earthquake measures an S-wave with a maximum amplitude of 2 mm. Based on this data, use the nomogram shown above to estimate the Richter Magnitude for this earthquake. Enter your answer with one number to the right of the decimal point (e.g., 4.0 or 6.9).
5.6
Assume that a seismograph located 20 km from the epicenter of an earthquake measures an S-wave with a maximum amplitude of 10 mm. Based on this data, use the nomogram shown above to estimate the Richter Magnitude for this earthquake. Enter your answer with one number to the right of the decimal point (e.g., 4.0 or 6.9).
2.5
At a given location, Event 2 produces the same ground motion (S-wave amplitude) as Event 1. Use the nomogram shown above to estimate the Richter Magnitude for Event 2. Enter your answer with one number to the right of the decimal point (e.g., 4.0 or 6.9).Event 1: 300km, 6Event 2: 100km, ??
5
At a given location, Event 2 produces the same ground motion (S-wave amplitude) as Event 1. Use the nomogram shown above to estimate the Richter Magnitude for Event 2. Enter your answer with one number to the right of the decimal point (e.g., 4.0 or 6.9).Event 1: 200km, 4 Event 2: 50km, ??
3.2