FINDING THE EPICENTER
OF AN EARTHQUAKE
Focus vs. Epicenter
Svaha (The other 5 second rule)
Lightning and Thunder


A general rule of thumb:
For every 5 seconds of
time between the lightning
and the thunder the storm
is about 1 mile away.
For example if you see the
lightning and count to 10
and then hear the thunder
the storm is about 2 miles
away. (10 seconds ÷ 5 =
2 miles)
P-Waves and S-Waves


The P-Waves would be
like the lightning because
the P-Waves are faster
and the S-Waves are like
the thunder because the SWaves are slower.
The longer the time
interval between the PWaves and the S-Waves
the further away the
epicenter.
Triangulation
The Factor Label Method of Conversion
Safety Compass (1cm = 10 mm)
The Loma Prieta Quake
Oct. 17, 1989
 San Francisco Bay Area (California)
 Magnitude of 6.9 on the Richter Scale
 63 casualties with thousands of injuries
 Main shaking lasted 10-15 seconds
 What (specifically) most probably caused
this quake?

Some major damage
Game 3 of the World Series
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