Reviewed by USGSAlaska18y ago
M3.0 earthquake 39 km E of Atka, Alaska
Thursday, July 3, 2008, 09:00:20 UTC · 52.245°N, 173.634°W
A magnitude 3.0 earthquake struck 39 km E of Atka, Alaska on Thursday, July 3, 2008, 09:00:20 UTC, at a depth of 17.5 km (shallow).
- Magnitude
- 3.0
- Minor · ml
- Depth
- 18 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
143 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
18 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 3 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.6 on August 1, 2008. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 749 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.61957 Atka, Alaska EarthquakeMarch 9, 1957 · 160 km SW of this epicenter
- 8.01986 Atka, Alaska EarthquakeMay 7, 1986 · 112 km SW of this epicenter
- 7.977 km WSW of Adak, AlaskaJune 10, 1996 · 284 km W of this epicenter
- 7.65 km WNW of Adak, AlaskaFebruary 14, 1905 · 213 km W of this epicenter
- 7.4133 km WNW of Nikolski, AlaskaApril 18, 1916 · 240 km NE of this epicenter
- 7.388 km WSW of Adak, AlaskaJuly 7, 1929 · 295 km W of this epicenter
- 7.346 km SSW of Adak, AlaskaJune 10, 1996 · 236 km W of this epicenter
- 7.175 km S of Adak, AlaskaMarch 14, 1957 · 243 km SW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 11 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 2 recorded deaths. The most severe:
- 1957M8.6
Alaska
9 Mar 1957 · 160 km away
2 deathsSevere damage ($5–24M)tsunami
- 1986M8.0
Aleutian Islands: Adak
7 May 1986 · 112 km away · intensity VI
Moderate damage ($1–5M)tsunami
- 1901M7.8
Aleutian Islands: Fox Islands
31 Dec 1901 · 200 km away
Limited damage (under $1M)tsunami
- 1996M7.9
Andreanof Islands
10 Jun 1996 · 284 km away · intensity VI
tsunami
- 1907M7.8
Aleutian Islands
2 Sep 1907 · 268 km away
- 1929M7.8
Aleutian Islands: Fox Islands
7 Mar 1929 · 286 km away · intensity V
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.