Slide 29-1, Turnagain Heights, Alaska
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Resource ID
43307
Resource Type
Photo
Availability
UGS Program
Title
Slide 29-1, Turnagain Heights, Alaska
Publisher
Utah Geological Survey
Date
1964
Publication Identification
UGS OFR 211-A, Part 2
Accession Number
S5538
County
Anchorage
State
Alaska
Keywords
earthquake hazards, slide set
Photo Type
Camera Make / Model
LS9000 Slide
Resolution (dpi)
4000
Image Size
3767x5597
Source
Utah Geological Survey
Original Filename
S5538.jpg
Abstract / Description
The 1964 Good Friday earthquake near Anchorage, Alaska (magnitude 8.4). Turnagain Heights, an Anchorage residential area on a slope overlooking Knik Arm of Cook Inlet, slid toward the sea when a layer of clay liquefied (note, although liquefaction has been discussed in terms of water-saturated sandy soils, there are certain clays, called quick clays, which can liquefy and cause slope failure). The hillside slumped downward, and an area 2 km (1 mi) long and 300 m (990 ft) wide slid over the liquefied layer. The ground broke into large chunks that turned and twisted as they moved along; large cracks and fissures appeared between the blocks of earth, and scarps as high as 15 m (50 ft) were formed. Houses and occupants traveled with the earth. Over 70 buildings were dislodged and destroyed by the slide. The yellow lines and numbers here indicate (1) where house was originally, (2) where house slid to, (3) occupants of house tried to get out this way after the ground stopped moving (the occupants had run out of the house when they first felt the earthquake, and they slid down with the broken up ground separately from the house), and (4) how the occupants finally did get out of the slide area with help from people up on the bluff. This photo is from National Geographic Magazine. For dramatic personal accounts, see the July 1964 issue of National Geographic Magazine.
Marker lat / long: 61.200309, -149.902479 (WGS84)
