M5.6 earthquake 1 km SW of Aguilar, Philippines
A magnitude 5.6 earthquake struck 1 km SW of Aguilar, Philippines on Sat, Apr 25, 1987, 8:16 PM GMT+8 (12:16 UTC), 106 km (66 mi) below the surface.
A larger quake followed: M6.9 4 km N of Canaoalan, Philippines. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.6 (mb, body-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1987-04-25 12:16:48 UTC
- Depth
- 106.0 km (65.9 mi), intermediate-depth
- Epicenter
- 15.877° N, 120.226° E
- Region
- Philippines
- Strongest shaking
- IV, light shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 5.6 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · 20 stations |
| 6.64 | Mw, moment | ISCGEMSUP | Final · ±1.24 |
Deaths and damage
From NOAA NCEI’s Significant Earthquake Database (record 5133), matched to this event by time and place.
- Damage
- Limited (under about $1 million)
Where the literature gives no number, NCEI records a description on a scale of 1 to 4, printed here in its words. Damage is in millions of US dollars of the year of the event, not adjusted for inflation.
What happened
The USGS’s account of the effects of this earthquake.
Foreshock. Depth from broadband displacement seismograms.
From the USGS event page for usp00034f8. U.S. Geological Survey text and figures are in the public domain.
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- IV, light shaking
- Peak ground acceleration
- 2.6% of gravity
- Peak ground velocity
- -0.1 cm/s
- Map
- Automatic
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Depth from
- OPERATOR_ASSIGNED
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.6 and up: 4 in the 60 days after this one and 0 in the 30 days before it.
After
- 6.94 km N of Canaoalan, Philippines · 14408 days ago · 107 km deep · 22 km away
- 4.611 km W of Bani, Philippines · 14390 days ago · 51 km deep · 53 km away
- 4.151 km W of Palauig, Philippines · 14372 days ago · 33 km deep · 95 km away
- 5.054 km WSW of Bolitoc, Philippines · 14371 days ago · 38 km deep · 95 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00034f8 (also filed as iscgem469950, atlas19870425121651, iscgemsup469950). Read Mon, Oct 5, 2026, 11:52 AM UTC.