M5.3 earthquake 266 km W of Adak, Alaska
A magnitude 5.3 earthquake struck 266 km W of Adak, Alaska on Wed, Mar 3, 1999, 9:15 AM GMT+12 (21:15 UTC), 72 km (45 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.3 (Mwc, centroid moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1999-03-02 21:15:29 UTC
- Depth
- 72.1 km (44.8 mi), intermediate-depth
- Epicenter
- 51.591° N, 179.538° E
- 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 |
|---|---|---|---|
| 5.3 | Mwc, centroid moment | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.24 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.2 | Mwc, centroid moment | Global CMT project | Preliminary |
Did you feel it?
No one has reported feeling this quake to the USGS.
Fault motion and ground failure
How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.
- Faulting
- Strike-slip
- Nodal plane 1
- Strike 70°, dip 36°, rake 154°
- Nodal plane 2
- Strike 181°, dip 75°, rake 57°
How well it is located
Reviewed by a seismologist.
- Depth from
- CONSTRAINED_BY_DEPTH_PHASES
Nearby
Within 100 km, magnitude 2.3 and up: 8 in the 60 days after this one and 1 in the 30 days before it.
After
- 3.7Rat Islands, Aleutian Islands, Alaska · 10075 days ago · 33 km deep · 70 km away
- 4.6Rat Islands, Aleutian Islands, Alaska · 10074 days ago · 33 km deep · 94 km away
- 4.5Rat Islands, Aleutian Islands, Alaska · 10061 days ago · 33 km deep · 90 km away
- 4.5Rat Islands, Aleutian Islands, Alaska · 10061 days ago · 33 km deep · 85 km away
- 4.4Rat Islands, Aleutian Islands, Alaska · 10061 days ago · 33 km deep · 95 km away
- 4.2Rat Islands, Aleutian Islands, Alaska · 10059 days ago · 33 km deep · 83 km away
- 4.5174 km W of Adak, Alaska · 10054 days ago · 33 km deep · 93 km away
- 3.7Rat Islands, Aleutian Islands, Alaska · 10052 days ago · 33 km deep · 73 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00093rg (also filed as gcmtb030299e, gcmt19990302211529, iscgem1537445). Read Sat, Oct 3, 2026, 9:39 PM UTC.