Magnitude 7.2 - ANDREANOF ISLANDS, ALEUTIAN IS., ALASKA
2007 December 19 09:30:30 UTC
- This event has been reviewed by a seismologist.
|Depth||56.3 km (35.0 miles)|
|Region||ANDREANOF ISLANDS, ALEUTIAN IS., ALASKA|
|Distances||35 km (20 miles) WNW of Amatignak Island, Alaska|
85 km (55 miles) SE of Semisopochnoi Island, Alaska
2115 km (1310 miles) WSW of Anchorage, Alaska
2940 km (1830 miles) W of JUNEAU, Alaska
|Location Uncertainty||horizontal +/- 8.8 km (5.5 miles); depth +/- 10.9 km (6.8 miles)|
|Parameters||NST=130, Nph=130, Dmin=197.9 km, Rmss=0.62 sec, Gp= 54°,|
M-type=centroid moment magnitude (Mw), Version=6
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The following is a release by the United States Geological Survey, National Earthquake Information Center: An earthquake occurred 35 km (25 miles) NW of Amatignak Island, Alaska, 80 km (50 miles) SE of Semisopochnoi Island, Alaska, 2100 km (1300 miles) WSW of Anchorage, Alaska, 2925 km (1820 miles) W of JUNEAU, Alaska at 2:30 AM MST, Dec 19, 2007 (Dec 18 at 11:30 PM AHST in Aleutian Islands). The magnitude and location may be revised when additional data and further analysis results are available. No reports of damage or casualties have been received at this time.
Felt at Chugiak and Soldotna.
The Aleutian Islands earthquake of December 19, 2007, occurred on the boundary between the North America plate and the Pacific plate. In this region, the Pacific plate moves to the northwest with respect to the North American plate with a velocity of about 72 mm/y. The Pacific plate subducts beneath the North American plate at the Aleutian trench. The earthquake occurred as thrust-faulting on the interface between the plates.
The earthquake of December 19, 2007, ruptured a segment of the Pacific/North America plate boundary that is spatially situated between the segments of the plate boundary that ruptured in the great Aleutian Island earthquakes of March 9, 1957 (magnitude 8.6) and February 4, 1965 (magnitude 8.7). Great earthquakes also occurred in the central Aleutian arc on May 7, 1986 (magnitude 8, about 300 km distant from the site of the 2007 earthquake) and June 10, 1996 (magnitude 7.9, about 150 km distant from the site of the 2007 earthquake)
Scientific & Technical Information
The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets.
General Tsunami Information
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver