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Pacific Coastal and Marine Science Center

U.S. West Coast and Alaska Marine Geohazards

Earthquake Hazards in Southeastern Alaska

Study region along the Queen Charlotte-Fairweather fault offshore southeastern Alaska

Map of study region along the Queen Charlotte-Fairweather fault offshore southeastern Alaska.

Study region along the Queen Charlotte-Fairweather fault offshore southeastern Alaska. Rectangles show locations of the two USGS-led marine geophysical surveys in May and August 2015. The third cruise was offshore Haida Gwaii, British Columbia, and southern Alaska in September 2015 (see inset map). CSF, Chatham Strait fault; CSZ, Coastal shear zone; LIPSF, Lisianski Inlet-Peril Strait fault; QCFF, Queen Charlotte-Fairweather fault.
[Larger version]

Enlarged, detailed map of Survey Area 1 showing new multibeam bathymetry data near Cross Sound and Glacier Bay National Park, southeastern Alaska.

Enlarged details of Survey Area 1 showing new multibeam bathymetry data (rainbow colors) acquired on R/V Solstice near Cross Sound and Glacier Bay National Park, southeastern Alaska. Arrows highlight the surface expression, or trace, of the Queen Charlotte-Fairweather fault. Rectangle shows area of next expanded map view. [Larger version]

Map of area delineated on previous map, bathymetry near Cross Sound, showing a string of basins along the fault and offset of the south wall of the Yakobi Sea Valley.

Enlarged from previous figure, this map shows a string of basins along the fault and offset of the south wall of the Yakobi Sea Valley. Line A–B marks the location of multichannel seismic-reflection profile (below). [Larger version]

Seismic profile showing sediment layers beneath the seafloor disrupted by the Queen Charlotte-Fairweather fault near Cross Sound.
Multichannel seismic-reflection profile showing sediment layers beneath the seafloor disrupted by the Queen Charlotte-Fairweather fault near Cross Sound, (see line A–B on expanded bathymetric map, above). The profile is approximately 16 kilometers across, and it extends approximately 370 meters beneath the seafloor. [Larger version]

 

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