5.2 Earthquake Rocks Alaska Southwest of Anchorage

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5.2 Earthquake Rocks Alaska Southwest of Anchorage

The Alaska Earthquake Information Center located a moderate earthquake that occurred on Thursday, June 16th at 11:06 AM AKDT in the Kenai Peninsula region of Alaska. This earthquake had a preliminary magnitude of 5.2 and was located at a depth of about 36 miles (57 km). The magnitude and location may change slightly as additional data are received and processed. This event was felt widely in the Kenai and Cook Inlet region. The strongest shaking was reported in Sterling and Soldotna. No reports of this event causing damage have been received at this time.

Distance to nearby locations:
26 km ( 16 miles) NNE of Kenai
30 km ( 19 miles) NNW of Sterling
31 km ( 19 miles) N of Soldotna
34 km ( 21 miles) S of Tyonek
49 km ( 31 miles) NNE of Kasilof
63 km ( 39 miles) NNE of Clam Gulch
73 km ( 46 miles) WNW of Cooper Landing
78 km ( 49 miles) WSW of Hope
Preliminary earthquake parameters:
Origin Time (UT): 06/16/2011 19:06:05
Latitude: 60 N 46’
Longitude: 151 W 03’
Depth: 57 km
Magnitude: ML 5.2

The moderately sized earthquake was centered about 50 miles southwest of Alaska’s largest city, Anchorage, and struck at 11:06 a.m. Alaska time, according to the National Weather Service’s West Coast and Alaska Tsunami Warning Center. No tsunami warnings were issued. Many people in Anchorage and outlying communities reported feeling the quake, which struck Alaska’s most densely populated region.

This quake was also followed by two smaller, 2.6 magnitude quakes, one located at:

Magnitude 2.6
Date-Time
Thursday, June 16, 2011 at 11:14:17 AM at epicenter
Time of Earthquake in other Time Zones
Location 60.737°N, 151.097°W
Depth 60.4 km (37.5 miles)
Region KENAI PENINSULA, ALASKA
Distances
10 km (6 miles) ENE (70°) from Nikiski, AK
20 km (12 miles) NE (36°) from Salamatof, AK
21 km (13 miles) NNE (20°) from Kenai, AK
88 km (55 miles) SW (236°) from Anchorage, AK

Location Uncertainty horizontal +/- 0.3 km (0.2 miles); depth +/- 0.7 km (0.4 miles)
Parameters NST= 26, Nph= 28, Dmin=53.9 km, Rmss=1 sec, Gp= 58°,
M-type=local magnitude (ML), Version=1

The second quake information:

Magnitude 2.6
Date-Time
Thursday, June 16, 2011 at 20:04:12 UTC
Thursday, June 16, 2011 at 12:04:12 PM at epicenter
Time of Earthquake in other Time Zones
Location 57.657°N, 155.163°W
Depth 67.4 km (41.9 miles)
Region ALASKA PENINSULA
Distances
48 km (30 miles) W (281°) from Karluk, AK
71 km (44 miles) W (281°) from Larsen Bay, AK
99 km (62 miles) NW (323°) from Akhiok, AK
497 km (309 miles) SW (220°) from Anchorage, AK

Location Uncertainty horizontal +/- 0.6 km (0.4 miles); depth +/- 0.9 km (0.6 miles)
Parameters NST= 22, Nph= 22, Dmin=53.9 km, Rmss=0.73 sec, Gp=155°,
M-type=local magnitude (ML), Version=1

Source Alaska Earthquake Information Center
Geophysical Institute, University of Alaska Fairbanks

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