Thursday, April 21, 1977 at 10:45 AM
1977-04-21 01:45 UTC · 26.861°, 142.440°
Magnitude
6.2 ms
Major
Depth
33 km
Shallow
Energy
30.1 kilotons of TNT
Gutenberg–Richter
Coordinates
26.861°, 142.440°
Felt reports
—
Tsunami
No
Source
USGS
Region
—
Can cause serious damage over larger areas.
At 33 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: Philippine Trench (~2309 km away). Last major event: 2012 Samar Earthquake (M7.6).
Area seismic-hazard score: 8/100 (low).
4 recorded M4.0+ events within 298 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.