M4.5 earthquake 55 km SSE of Adak, Alaska
A magnitude 4.5 earthquake struck 55 km SSE of Adak, Alaska on Mon, Oct 27, 1997, 12:35 PM HAST (22:35 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.2 42 km ESE of Adak, Alaska. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.5 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1997-10-27 22:35:01 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 51.399° N, 176.368° W
- Region
- Alaska
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
What happened
The USGS’s account of the effects of this earthquake.
Felt (III) on Adak.
From the USGS event page for usp00089pq. 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 1.5 and up: 9 in the 60 days after this one and 3 in the 30 days before it.
After
- 4.483 km SSW of Adak, Alaska · 10562 days ago · 33 km deep · 63 km away
- 4.990 km WSW of Adak, Alaska · 10549 days ago · 33 km deep · 94 km away
- 5.242 km ESE of Adak, Alaska · 10545 days ago · 51 km deep · 49 km away
- 4.131 km ESE of Adak, Alaska · 10537 days ago · 61 km deep · 45 km away
- 4.495 km S of Adak, Alaska · 10536 days ago · 33 km deep · 41 km away
- 4.683 km S of Adak, Alaska · 10532 days ago · 33 km deep · 42 km away
- 4.280 km SSE of Adak, Alaska · 10530 days ago · 33 km deep · 26 km away
- 3.468 km SE of Adak, Alaska · 10523 days ago · 33 km deep · 36 km away
- 3.764 km ESE of Adak, Alaska · 10509 days ago · 33 km deep · 41 km away
Before
Earthquakes todayAlaska earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00089pq. Read Thu, Oct 1, 2026, 4:19 PM UTC.