Download - Epicenter location 6th
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