How large an earthquake can Peru–Chile Trench produce?

The maximum magnitude potential compiled for Peru–Chile Trench is M9.5. That figure comes from the length and width of the fault area that could rupture at once, calibrated against its historical and paleoseismic record. It is an upper bound on what the structure can do, not a forecast of the next event.

Is Peru–Chile Trench overdue for an earthquake?

No fault is ever 'overdue' in the way the phrase suggests. Recurrence intervals are averages over a handful of past ruptures, not a schedule: the interval between two events on the same fault routinely varies by a factor of two or more. The elapsed time shown on this page is exactly that — how long it has been — and not a probability that a rupture is imminent.

How is the seismicity on this page selected?

Every earthquake listed sits within 25 km of the mapped trace of Peru–Chile Trench, measured as the distance to the nearest fault segment rather than to a bounding box. Events on a neighbouring structure therefore do not appear here, even when they are geographically close. The slip rate of 65–70 mm/yr and the rupture history are compiled from the published literature.

All fault systems

Subduction megathrust

Peru–Chile Trench

Western South America

Plate boundary: Nazca ↔ South American

Length: 5,900 km
Mₘₐₓ potential: M9.5
Slip rate: 65–70 mm/yr
Recurrence interval: ~110 years

Time elapsed since the last known rupture

15%

16 years have passed against an average interval of about 110 years. Recurrence on a real fault is not a clock — this is elapsed time, not a probability of rupture.

Locking depth

10–50 km

The depth range over which the fault is locked and accumulating elastic strain. Below it the rock creeps aseismically; above it, strain is released in earthquakes.

Historical rupture sequence

2010M8.8Maule
1960M9.5Valdivia
1868M8.5Arica

Live seismicity within 25 km of the trace (last 30 days)

Loading seismicity along this fault trace…

Frequently Asked Questions (FAQ)

Verified scientific, operational, and emergency protocols

Peru–Chile Trench is a subduction megathrust system running roughly 5,900 km through Western South America. The kinematics describe how the two sides move relative to each other, which governs both the shaking a rupture produces and whether it can displace the sea floor.