Major Ocean Tsunami Generated (Historical Record)
This undersea earthquake generated recorded tsunami waves across coastal and trans-oceanic sectors. Preserved in seismic archive for scientific reference — no active hazard exists.
M 8.2 earthquake
Off the coast of Escuintla, Mexico
A magnitude 8.2 (MW) earthquake occurred on 2017-09-08, 22:49 local time (04:49 UTC) (9y ago), centered Off the coast of Escuintla (140 km W, Mexico). The hypocenter was located at a intermediate depth of 47.4 km. Primary telemetry verified by USGS.
Historical Landmark Earthquake
#45 of All TimeCurated Global Seismic Archive (1700–Present)
A magnitude 8.2 earthquake struck Off the coast of Escuintla, Mexico on September 8, 2017. Source: Middle America Trench megathrust. Documented deaths: 98.
Magnitude
MW30.09 Mt TNT
Depth
47.4 kmintermediate (35–70 km (Intermediate))
PAGER Impact
redInjuries: > 5,000 · ~38.2M felt
Interactive Epicenter & Fault Map
Seismic Activity & Aftershock Sequence
Timeline of foreshocks, main rupture, aftershocks and machine learning risk probability evolution.
Situation Monitoring
Continuous verificationKey facts so far
Agency Discrepancy Matrix (Cross-Network Verification)
Comparing multi-network solutions from primary and teleseismic monitoring agencies.
| Network / Source | Magnitude (Scale & Diff) | Depth & Diff | Epicenter & Shift (Δd) | Consensus | Event ID / Data |
|---|---|---|---|---|---|
USGS United States Geological Survey · Global / US | M8.2(Mw)Ref | 47.4 kmRef | 15.02°, -93.90°Origin | Authoritative | us2000ahv0 |
Why do agency magnitudes differ? Seismological agencies use different instrumentation networks, crustal velocity models, and mathematical magnitude scales (e.g. Moment Magnitude Mw vs Local Richter ML vs Surface Wave Ms). Differences of 0.1–0.3 are common and reflect physical observation geometry rather than errors.
Where it was felt
6 settlementsShaking intensity is modelled from magnitude, depth and distance (GMPE attenuation), not reported by residents.
| Town | Distance | Intensity |
|---|---|---|
| Pijijiapan · Chiapas | 104 km | MMI VIII |
| Escuintla · Chiapas | 141 km | MMI VIII |
| Tapachula · Chiapas | 176 km | MMI VII |
| Salina Cruz · Oaxaca | 189 km | MMI VII |
| Juchitan · Oaxaca | 197 km | MMI VII |
| Tehuantepec · Oaxaca | 204 km | MMI VII |
Tectonic setting
Nearest mapped active fault: Middle America Trench megathrust, 5 km away, slip rate ~15.0 mm/yr (GEM Global Active Faults).
Acapulco, Guerrero & Chiapas
View live seismic monitoring, historical danger benchmarks, fault slip models and recurrence intervals for this zone.