Sunday, September 8, 1918 at 1:16 AM
1918-09-07 17:16 UTC ยท 44.998ยฐ, 152.320ยฐ
Magnitude
8.1 mw
Extreme
Depth
15 km
Shallow
Energy
21.3 megatons of TNT
GutenbergโRichter
Coordinates
44.998ยฐ, 152.320ยฐ
Felt reports
โ
Tsunami
No
Source
USGS
Region
โ
Among the largest earthquakes ever recorded.
At 15 km this was a shallow earthquake. Shallow quakes concentrate shaking near the epicentre and tend to be the most damaging.
This event sits in the Extreme range of the moment magnitude scale.
Nearest mapped structure: Manila Trench (~3962 km away). Last major event: 1934 Manila Trench Earthquake.
Area seismic-hazard score: 8/100 (low).
4 recorded M4.0+ events within 374 km in the 90 days after this earthquake.
Data from USGS. Magnitudes and locations are preliminary and may be revised. For official information consult PHIVOLCS / USGS.