M 7.8 earthquake – Rat Islands, Aleutian Islands, Alaska
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Local time: Nov 17, 2003 · 18:43 (UTC+12)
MajorShallow · 33 km
Reviewed by a seismologist
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- Magnitude
- 7.8moment magnitude (mwc)
- Depth
- 33 kmShallow earthquake
- Epicenter
- 51.146, 178.6501,381 km from Petropavlovsk-Kamchatsky
- Energy released
- 7.6 megatons of TNTabout 504 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- —not estimated
- Aftershocks
- 500M2.5+ within 218 km, up to 60 days
- Significance
- 936USGS score, 0–1,000+
The strongest here since 1996
The last earthquake at least as strong within 300 km struck on Jun 10, 1996.
How strong was it?
Major earthquake. It released 7.6 megatons of TNT, 15,849 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
500 earthquakes of M2.5+ within 218 km in the 60 days after.
- 5.4 Rat Islands, Aleutian Islands, Alaska Nov 17, 2003
- 5.2 Rat Islands, Aleutian Islands, Alaska Nov 17, 2003
- 5.1 Rat Islands, Aleutian Islands, Alaska Nov 17, 2003
- 4.9 Rat Islands, Aleutian Islands, Alaska Nov 17, 2003
- 4.8 Rat Islands, Aleutian Islands, Alaska Nov 17, 2003
- 4.0 Rat Islands, Aleutian Islands, Alaska Nov 17, 2003
- 4.5 Rat Islands, Aleutian Islands, Alaska Nov 17, 2003
- 5.5 Rat Islands, Aleutian Islands, Alaska Nov 17, 2003
- 4.5 Rat Islands, Aleutian Islands, Alaska Nov 17, 2003
- 5.1 Rat Islands, Aleutian Islands, Alaska Nov 17, 2003
The strongest earthquakes within 300 km
Since 1900, around United States.
- 8.7 1965 Western Aleutian Islands (Hawadax/Rat Islands) Earthquake Feb 4, 1965
- 8.3 1906 Western Aleutian Islands (Hawadax/Rat Islands) Earthquake Aug 17, 1906
- 7.9 Rat Islands, Aleutian Islands, Alaska Jun 23, 2014
- 7.9 77 km WSW of Adak, Alaska Jun 10, 1996
- 7.6 Rat Islands, Aleutian Islands, Alaska Mar 30, 1965
- 7.4 265 km WSW of Adak, Alaska Feb 4, 1965
- 7.3 88 km WSW of Adak, Alaska Jul 7, 1929
- 7.2 238 km SSE of Attu Station, Alaska Sep 8, 1939
In the week before
Earthquakes within 218 km in the 7 days before this one: possible foreshocks.