Epicenter

Location

32R

Epicenter Location

When an EQ happens, it travels in all

directions from the focus

Epicenter Location

If you feel an EQ, you won’t know which

direction it came from

???

Epicenter Location

To locate epicenter, need:

3 EQ stations

Seismogram recordings

Difference in time between P and S-wave

Epicenter Location

The difference in arrival times of P-waves and

S-waves tells you how far away epicenter is

Difference in

time?

4-1 = 3 seconds

Epicenter Location

The difference in arrival times of P-waves and

S-waves tells you how far away epicenter is

The longer the time, the further away from EQ

4-1 = 3 seconds

Which city is

closest to the

earthquake?

Which

earthquake is

the furthest?

6 minutes

2 minutes

4 minutes

3 minutes

Which earthquake is the closest? Furthest?

Time

difference

6 minutes

2 minutes

4 minutes

3 minutes

Which earthquake is the closest? Furthest?

Time

difference

The data below is

a recording for an

EQ at one of these

epicenters (A-D).

Which one is it?

The data below is

a recording for an

EQ at one of these

epicenters (A-D).

Which one is it?

The data below is

a recording for an

EQ at one of these

epicenters (A-D).

Which one is it?

Which city is

closest to the EQ?

LA, then Santa

Barbara, then

Palmdale, then

San Bernardino

Which EQ did all

four

15 seconds

40 seconds

41 seconds

56 seconds