Tuesday, August 31, 1999 at 3:11 AM
1999-08-30 19:11 UTC · 4.488°, 125.668°
Magnitude
4.2 mb
Moderate
Depth
174 km
Intermediate
Energy
30 tons of TNT
Gutenberg–Richter
Coordinates
4.488°, 125.668°
Felt reports
—
Tsunami
No
Source
USGS
Region
Celebes Sea
Felt widely; can cause minor damage to weak structures.
At 174 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 Moderate range of the moment magnitude scale.
Nearest mapped structure: Cotabato Trench (~135 km away).
Area seismic-hazard score: 28/100 (moderate).
Data from USGS. Magnitudes and locations are preliminary and may be revised. For official information consult PHIVOLCS / USGS.