Two Powerful Quakes Strike Fox Islands, Alaska

Two powerful Earthquakes Measuring 6.5 and 6.6 Mw Strike Fox Islands, Aleutian Islands, Alaska

The first earthquake a magnitude 6.5 quake struck on Tuesday, October 13, 2009 at 05:37:21 UTC at a depth of 18 km, followed by a swarm of smaller aftershocks and a second powerful shock measuring 6.6Mw, which struck some 15 hours later.

An earlier quake, also measuring M 6.6, struck the same region about 250km WNW of the recent cluster on October 2, 2009.
Two Powerful Quakes Strike Fox Islands, Alaska

FEWW Moderators have forecast a large earthquake for Kenai Peninsula, Southern Alaska. See links below

• Alaska Earthquake Forecast: Update 3
• Alaska Earthquake Forecast: Update 2
• Alaska Earthquake Forecast

Based on the pattern in which the recent quakes are occurring, the Moderators believe a prolonged period of powerful seismic activity in the region may have begun.

This Earthquake:

10-degree Map Centered at 55°N,170°W

Earthquake Location Map. Source: USGS/EHP. Enhanced by FEWW

• Magnitude: 6.6  [maximum quake magnitude estimated by FEWW]
• Date-Time:
  • Tuesday, October 13, 2009 at 20:21:54 UTC
  • Tuesday, October 13, 2009 at 12:21:54 PM at epicenter
• Location: 52.634°N, 167.149°W
• Depth: 13.7 km (8.5 miles) (poorly constrained)
• Region: FOX ISLANDS, ALEUTIAN ISLANDS, ALASKA
• Distances:
  • 120 km (75 miles) ESE (106°) from Nikolski, AK
  • 146 km (90 miles) SSW (197°) from Unalaska, AK
  • 190 km (118 miles) SSW (209°) from Akutan, AK
  • 1413 km (878 miles) SW (236°) from Anchorage, AK
• Location Uncertainty: horizontal +/- 8 km (5.0 miles); depth +/- 27.6 km (17.1 miles)
• Source: USGS NEIC (WDCS-D)
• Event ID: us2009mscj

Related Links:

• Alaska: Magnitude 6.6 Quake Strikes Fox Islands [Oct. 2, 2009]
• Alaska Earthquake Forecast: Update 3
• Alaska Earthquake Forecast: Update 2
• Alaska Earthquake Forecast

• Earthquakes [Main Index Page]