M5.6 earthquake 26 km WSW of Sipalay, Philippines
A magnitude 5.6 earthquake struck 26 km WSW of Sipalay, Philippines on Wed, Jan 5, 1983, 12:28 PM GMT+8 (04:28 UTC), 33 km (21 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.6 (Ms, surface-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1983-01-05 04:28:10 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 9.665° N, 122.182° E
- Region
- Philippines
- Strongest shaking
- V, moderate 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 | Ms, surface-wave | USGS National Earthquake Information Center | Preferred · Reviewed · 8 stations |
| 5.96 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 6.0 | Mwc, centroid moment | Global CMT project | Preliminary |
What happened
The USGS’s account of the effects of this earthquake.
CENTROID, MOMENT TENSOR SOLUTION HARVARD EVENT-FILE NAME B010583B DATA USED: GDSN L.P. BODY WAVES: 16S, 43C, T=45 CENTROID LOCATION: ORIGIN TIME 4:28:15.1 0.3 LAT 9.59N 0.03;LON 122.03E 0.05 DEP 17.3 2.2;HALF-DURATION 3.9 MOMENT TENSOR; SCALE 10**24 D-CM MRR=4.01 0.20; MTT=0.43 0.20 MFF=-4.44 0.33; MRT=0.51 0.34 MRF=-9.93 1.42; MTF=0.55 0.17 PRINCIPAL AXES: 1.(T) VAL=10.58;PLG=57;AZM=89 2.(N) 0.48; 1; 357 3.(P) -11.05; 33; 266 BEST DOUBLE COUPLE:M0=1.1*10**25 NP1:STRIKE=349;DIP=12;SLIP=83 NP2:Strike=177;Dip=78;Slip=91
From the USGS event page for usp0001s06. 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
- V, moderate shaking
- Peak ground acceleration
- 6.5% of gravity
- Peak ground velocity
- 1.5 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
- 4.912 km WSW of Sipalay, Philippines · 15975 days ago · 33 km deep · 14 km away
- 4.919 km WSW of Maricalom, Philippines · 15975 days ago · 33 km deep · 9 km away
- 5.034 km WSW of Maricalom, Philippines · 15970 days ago · 42 km deep · 13 km away
- 4.431 km SW of Cayhagan, Philippines · 15964 days ago · 33 km deep · 18 km away
Earthquakes todayPhilippines earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001s06 (also filed as gcmtb010583b, gcmt19830105042810, atlas19830105042811, iscgem584058). Read Thu, Oct 1, 2026, 4:23 PM UTC.