Earthquakes
Interpret earthquake evidence and distinguish the source, observed effects, hazards, and appropriate safety decisions.
Earthquakes
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Earthquakes release stored elastic energy when a fault suddenly slips
The focus is where rupture begins underground; the epicenter is the surface point directly above it. Fast P waves arrive before S waves. The growing P–S arrival gap helps estimate distance from a station to the epicenter.
Locate with evidence
One station gives distance, not direction. Three station-distance circles can identify a common epicenter.
Damage is not magnitude alone
Depth, distance, soil, construction, exposure, and vulnerability all affect consequences.
Source → waves → location → effects
Problem: Station A has a larger S–P interval than Station B.
Recognize: P waves pull farther ahead of slower S waves over a longer trip.
Do it fast: Station A is farther from the epicenter.
Why it works
This turns a seismogram observation into a distance conclusion without confusing arrival time, magnitude, or intensity.
Five forms you should recognize
Rupture begins at the focus along a fault.
P waves normally arrive before S waves.
Use at least three station distances for triangulation.
Intensity can vary across communities.
Strong undersea vertical displacement can generate a tsunami.
Check before you commit
- Switching focus and epicenter
- Calling intensity and magnitude identical
- Assuming the nearest station alone gives direction
- Forgetting that S waves cannot cross liquid
- Treating every undersea earthquake as a tsunami source
- Believing exact earthquake prediction is currently possible
Do you need the lesson-or just practice?
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Foundations
Build the core procedure with immediate explanations.
Core Practice
Use mixed forms with less scaffolding.
UPCAT-Style Transfer
Apply the competency in unfamiliar representations.
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Earthquakes FAQ
Can scientists predict the exact time of an earthquake?
No. They assess faults, hazards, and probabilities, but cannot reliably specify the exact time, place, and magnitude.
Why can one earthquake have several intensity reports?
Shaking and damage vary with distance, local ground, structures, and observation location.
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