Wednesday, September 21, 1977 at 9:21 PM
1977-09-21 12:21 UTC · -6.139°, 130.279°
Magnitude
5.1 mb
Strong
Depth
137 km
Intermediate
Energy
674 tons of TNT
Gutenberg–Richter
Coordinates
-6.139°, 130.279°
Felt reports
—
Tsunami
No
Source
USGS
Region
—
Can cause damage to buildings and infrastructure near the epicentre.
At 137 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 Strong range of the moment magnitude scale.
Nearest mapped structure: Philippine Trench (~1276 km away). Last major event: 2012 Samar Earthquake (M7.6).
Area seismic-hazard score: 8/100 (low).
Data from USGS. Magnitudes and locations are preliminary and may be revised. For official information consult PHIVOLCS / USGS.