Shadow Zone & Locating an Epicenter. 1.This is a wide belt around earth on the side opposite the focus in which no seismic waves are received. 2.Is it.

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Presentation transcript:

Shadow Zone & Locating an Epicenter

1.This is a wide belt around earth on the side opposite the focus in which no seismic waves are received. 2.Is it caused by refection or refraction? 3.What type of graph is used to find the distance to the epicenter? 4.What happens to the lag time as the waves get further from the epicenter? 5.How many seismic stations are required to find an epicenter?

1. Shadow Zone

1.This is a wide belt around earth on the side opposite the focus in which no seismic waves are received. 2.Is it caused by refection or refraction? 3.What type of graph is used to find the distance to the epicenter? 4.What happens to the lag time as the waves get further from the epicenter? 5.How many seismic stations are required to find an epicenter?

2. refraction

1.This is a wide belt around earth on the side opposite the focus in which no seismic waves are received. 2.Is it caused by refection or refraction? 3.What type of graph is used to find the distance to the epicenter? 4.What happens to the lag time as the waves get further from the epicenter? 5.How many seismic stations are required to find an epicenter?

3. Time-travel graph

1.This is a wide belt around earth on the side opposite the focus in which no seismic waves are received. 2.Is it caused by refection or refraction? 3.What type of graph is used to find the distance to the epicenter? 4.What happens to the lag time as the waves get further from the epicenter? 5.How many seismic stations are required to find an epicenter?

4. The lag time INCREASES as distance from the epicenter increases.

1.This is a wide belt around earth on the side opposite the focus in which no seismic waves are received. 2.Is it caused by refection or refraction? 3.What type of graph is used to find the distance to the epicenter? 4.What happens to the lag time as the waves get further from the epicenter? 5.How many seismic stations are required to find an epicenter?

5. 3

What is the distance to the epicenter if the arrival time for the P-wave is 7 min?