M5.7 earthquake 226 km WSW of Adak, Alaska
A magnitude 5.7 earthquake struck 226 km WSW of Adak, Alaska on Fri, Jul 4, 1986, 6:01 PM HADT (03:01 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
- 5.7 (Mw, moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1986-07-05 03:01:32 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.248° N, 179.746° W
- Region
- Alaska
- 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 |
|---|---|---|---|
| 5.7 | Mw, moment | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.64 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.66 | Mw, moment | USGS historic United States catalog | Final |
| 5.6 | Mwc, centroid moment | Global CMT project | Preliminary |
What happened
The USGS’s account of the effects of this earthquake.
CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 14S, 33C Centroid Location: Origin Time 03:01:36.6 0.4 Lat 51.44N 0.04 Lon 179.87E 0.07 Dep 15.0 BDY Half-duration 2.4 Moment Tensor; Scale 10**24 D-CM Mrr=2.12 0.05 Mtt=-1.81 0.06 Mff=-0.32 0.06 Mrt=2.28 0.19 Mrf=1.57 0.15 Mtf=-0.94 0.06 Principal Axes: (T) Val=3.48 Plg=64 Azm=319 (N) Val=0.11 Plg=5 Azm=59 (P) Val=-3.58 Plg=26 Azm=151 Best Double Couple:Mo=3.5*10**24 NP1:Strike=252 Dip=20 Slip=104 NP2:Strike=57 Dip=71 Slip=85
Maximum observed Modified Mercalli Intensity (MMI) I
From the USGS event page for usp0002vqk. U.S. Geological Survey text and figures are in the public domain.
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
Nearby
Within 100 km, magnitude 2.7 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.2239 km WSW of Adak, Alaska · 14701 days ago · 33 km deep · 32 km away
- 4.6285 km WSW of Adak, Alaska · 14668 days ago · 33 km deep · 61 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002vqk (also filed as gcmtb070586a, ushis3957, gcmt19860705030132, iscgem490047). Read Sat, Oct 3, 2026, 6:45 PM UTC.