Saturday, December 22, 1917 at 1:54 AM
1917-12-21 17:54 UTC · 56.449°, -152.838°
Magnitude
6.6 mw
Major
Depth
15 km
Shallow
Energy
132.9 kilotons of TNT
Gutenberg–Richter
Coordinates
56.449°, -152.838°
Felt reports
—
Tsunami
No
Source
USGS
Region
—
Can cause serious damage over larger areas.
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 Major range of the moment magnitude scale.
Nearest mapped structure: Manila Trench (~8085 km away). Last major event: 1934 Manila Trench Earthquake.
Area seismic-hazard score: 8/100 (low).
2 recorded M4.0+ events within 315 km in the 90 days after this earthquake.
No other recent earthquakes nearby.
Browse all earthquakes →Data from USGS. Magnitudes and locations are preliminary and may be revised. For official information consult PHIVOLCS / USGS.