Friday, August 21, 1987 at 11:31 PM
1987-08-21 15:31 UTC · 18.007°, 120.453°
Magnitude
4.7 mb
Moderate
Depth
33 km
Shallow
Energy
169 tons of TNT
Gutenberg–Richter
Coordinates
18.007°, 120.453°
Felt reports
—
Tsunami
No
Source
USGS
Region
Luzon
Felt widely; can cause minor damage to weak structures.
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 Moderate range of the moment magnitude scale.
Nearest mapped structure: Casiguran Fault (~235 km away). Last major event: 1968 Casiguran Earthquake (M7.3).
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.