Thursday, February 21, 1957 at 10:30 PM
1957-02-21 14:30 UTC · 52.925°, -171.345°
Magnitude
6.8 mw
Major
Depth
104 km
Intermediate
Energy
284.1 kilotons of TNT
Gutenberg–Richter
Coordinates
52.925°, -171.345°
Felt reports
—
Tsunami
No
Source
USGS
Region
—
Can cause serious damage over larger areas.
At 104 km this was a intermediate earthquake. Intermediate-depth quakes spread shaking over a wider area but are usually less destructive at the surface.
This event sits in the Major range of the moment magnitude scale.
Nearest mapped structure: Manila Trench (~6925 km away). Last major event: 1934 Manila Trench Earthquake.
Area seismic-hazard score: 8/100 (low).
19 recorded M4.0+ events within 324 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.