A fault has averaged one major rupture every few centuries and is past that average.
What does that evidence provide?
Choose the strongest defensible interpretation.
Can you read the fault before the ground moves?
Load a tectonic boundary, choose what you expect, then watch friction, fluids, and seismic waves reveal why prediction and early warning are not the same promise.
Pressure hides until the fault gives way.
Build the boundary
Predict before observing
Stored stress at rupture
Awaiting prediction
Choose an outcome, then run the boundary.
The causal chain
Loading adds elastic stress. Effective friction sets the slip threshold. Fluids can lower that threshold, but real faults contain many interacting variations, so this model teaches relationships rather than dates.
No rupture yet. After slip, the faster P-wave reaches a sensor before the stronger S-wave.
A sensor detects a P-wave after rupture, 12 seconds before strong shaking reaches a city.
What does the alert provide?
The sequence matters: rupture, P-wave detection, alert, then S-wave arrival.
Radon rises near one fault, but similar rises often occur without earthquakes.
How should it be treated?
Useful research signals still require validation against false positives.
Transfer challenge
Explain why a 12-second alert can save lives without being a 12-second earthquake prediction.
Your explanation should mention that rupture has already begun.
Your field record
Complete a fault trial, classify all three signals, and solve the transfer challenge.
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