Reviewed by USGSAlaska18y ago
M3.0 earthquake 292 km ESE of Attu Station, Alaska
Friday, August 29, 2008, 07:01:20 UTC · 51.914°N, 177.207°E
A magnitude 3.0 earthquake struck 292 km ESE of Attu Station, Alaska on Friday, August 29, 2008, 07:01:20 UTC, at a depth of 2.3 km (shallow).
- Magnitude
- 3.0
- Minor · ml
- Depth
- 2 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- —
- No ShakeMap
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeDashed circle: 50 km aftershock search area
In context
How big was it, and why here?
Energy released
477 kg of TNT
That is about 1/31,575 of the Hiroshima bomb. A magnitude 5.0 releases about 1,000 times more energy.
Tectonic setting
117 km
from the nearest mapped plate boundary, between the North American and Pacific plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
2 km
Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.
Did You Feel It?
Where it was felt
No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.
I felt it — report to USGS ↗USGS PAGER estimate
Who was exposed to shaking
USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.
After the main event
Aftershocks within 50 km
USGS lists 7 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.4 on September 7, 2008. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 3.2Rat Islands, Aleutian Islands, Alaska18y ago · 34 km E of this epicenter
- 2.5Rat Islands, Aleutian Islands, Alaska18y ago · 43 km S of this epicenter
- 4.2Rat Islands, Aleutian Islands, Alaska18y ago · 45 km SE of this epicenter
- 3.2272 km ESE of Attu Station, Alaska18y ago · 43 km SW of this epicenter
- 3.9270 km ESE of Attu Station, Alaska18y ago · 43 km SW of this epicenter
- 2.6277 km ESE of Attu Station, Alaska18y ago · 48 km SW of this epicenter
- 4.4Rat Islands, Aleutian Islands, Alaska18y ago · 50 km E of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 692 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.71965 Western Aleutian Islands (Hawadax/Rat Islands) EarthquakeFebruary 4, 1965 · 128 km SE of this epicenter
- 8.31906 Western Aleutian Islands (Hawadax/Rat Islands) EarthquakeAugust 17, 1906 · 67 km E of this epicenter
- 7.8Rat Islands, Aleutian Islands, AlaskaNovember 17, 2003 · 131 km SE of this epicenter
- 7.6Rat Islands, Aleutian Islands, AlaskaMarch 30, 1965 · 187 km S of this epicenter
- 7.636 km NE of Attu Station, AlaskaFebruary 2, 1975 · 284 km NW of this epicenter
- 7.4265 km WSW of Adak, AlaskaFebruary 4, 1965 · 173 km E of this epicenter
- 7.2238 km SSE of Attu Station, AlaskaSeptember 8, 1939 · 186 km SW of this epicenter
- 7.2207 km WSW of Adak, AlaskaDecember 19, 2007 · 235 km E of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 9 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1975M7.6
Aleutian Islands: Near Islands
2 Feb 1975 · 284 km away · intensity IX
Moderate damage ($1–5M)
- 1965M8.7
Aleutian Islands: Rat Islands
4 Feb 1965 · 128 km away · intensity VI
Under $1 million damagetsunami
- 1906M8.3
Aleutian Islands: Rat Islands
17 Aug 1906 · 67 km away
- 1909M7.8
Aleutian Islands
10 Apr 1909 · 152 km away
- 2003M7.8
Aleutian Islands: Rat Islands
17 Nov 2003 · 131 km away
tsunami
- 1965M7.6
Aleutian Islands: Rat Islands
30 Mar 1965 · 184 km away
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.