メインコンテンツへ移動
Open on Live Map
HISTORICAL TSUNAMI RECORDSeptember 8, 2017

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.

Seismic Event Dossier22:49 Local (04:49 UTC)(9y ago)

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 Time

Curated Global Seismic Archive (1700–Present)

Top-100 Earthquakes

A magnitude 8.2 earthquake struck ⁨Off the coast of Escuintla, Mexico⁩ on 2017年9月8日. Source: ⁨Middle America Trench megathrust⁩. Documented deaths: 98.

Documented Fatalities98Source: NOAA NCEI Significant Earthquake Database
Fault KinematicsActive Fault
Equivalent Energy30.09 Mt TNT

マグニチュード

MW
M 8.2

30.09 Mt TNT

震源の深さ

47.4 km
47.4 km

intermediate (35–70 km（やや深い）)

PAGER影響評価

red
> 1,000 fatalities

負傷者数: > 5,000 · ~38.2M 人が体感

震央・断層インタラクティブマップ

15.02°N, 93.90°W
断層5 km
Middle America Trench megathrust
Active Fault · ~15.0 mm/yr
Felt byMMI III+
~38.2M exposed
~8.9M strong shaking
Primary SolutionUSGS
USGS#us2000ahv0reviewed
1 agencies reporting
Setting15.0°N
アカプルコ・ゲレロ・チアパス
Offshore / Marine rupture

Seismic Activity & Aftershock Sequence

Timeline of foreshocks, main rupture, aftershocks and machine learning risk probability evolution.

M0.0M4.5M9.0100%50%0%本震9月11日9月16日9月21日9月26日10月1日M8.2
Hover or tap a point to inspect aftershocks and risk probability curve.
<35 km (浅発・被害大)35–70 km（やや深い）>70 km (深発地震)本震
MLリスク予測:12h41%24h55%72h71%7d89%

Situation Monitoring

Continuous verification
Multi-agency verification of casualties, tsunami alerts, and seismic sequence

Key facts so far

Casualties
None expected (offshore epicenter)
Zero exposed population
Tsunami Status
TSUNAMI WARNING
NOAA PTWC & regional buoys
Citizen Felt Reports
0
Not felt / offshore epicenter
Macroseismic DYFI verification
Aftershock Sequence
Aftershocks: 50
High Omori aftershock probability
LightGBM hazard model forecast
Multi-agency seismic telemetry active. Awaiting wire headlines.

Agency Discrepancy Matrix (Cross-Network Verification)

Comparing multi-network solutions from primary and teleseismic monitoring agencies.

Network / SourceMagnitude (Scale & Diff)Depth & DiffEpicenter & Shift (Δd)ConsensusEvent 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 か所の集落

Shaking intensity is modelled from magnitude, depth and distance (GMPE attenuation), not reported by residents.

TownDistanceIntensity
Pijijiapan · Chiapas104 kmMMI VIII
Escuintla · Chiapas141 kmMMI VIII
Tapachula · Chiapas176 kmMMI VII
Salina Cruz · Oaxaca189 kmMMI VII
Juchitan · Oaxaca197 kmMMI VII
Tehuantepec · Oaxaca204 kmMMI VII

Tectonic setting

Nearest mapped active fault: Middle America Trench megathrust, 5 km away, slip rate ~15.0 mm/yr (GEM Global Active Faults).

地域地震プロファイル

アカプルコ・ゲレロ・チアパス

このゾーンのリアルタイム地震モニタリング、過去の危険基準、断層すべりモデル、再来周期を表示。