Earthquake hazards in the Alaska transportation corridors
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Earthquake hazards in the Alaska transportation corridors

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English

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    Based on observations made by modern seismographic networks since 1967, and taking into consideration historical records of large Alaskan earthquakes in the past, it is judged that the hazards faced by transportation corridors in different areas of the state increase in approximately the following order: (1) the circle area, including the Steese and Elliott highways, which contain a portion of the Tintina fault, now largely dormant; (2) The Rampart seismic zone, in which notable historic seismic activity occurred only in 1968 and 1969, but which contain the Yukon River bridge, a portion of the Dalton Highway, Manley hot springs road, and Tanana; (3) The Glennallen area, bisected by the Castle Mountain fault. This zone includes the southern Richardson Highway and portions of the border ranges fault system; (4) The Cantwell area. This segment contains the central Parks highway and the Denali highway. The principle tectonic element is the central portion of the Denali fault; (5) The faibanks area, an active seismiczone containing the nothern Richardson and northern Parks Highways. This area contains an almost continually active area extending from near harding lake to Fox; (6) The Valdez area, with the southernmost section of the Richardson Highway and the Edgerton Highway. This segments contains the epicentral area of the great earthquake of 1964, the Chugach Mountains, and portion of the border ranges fault system; (7) Kenai area. The Kenai Peninsula, with the seward Highway and the peninsula road net is highly seismically active and overlies an active sebduction zone; (8) The Talkeetna area, which contains Anchorage, Palmer and the southern Parks Highway. It is not unlikely that this will be the site of the Alaska mainland's next major earthquake. (64 p.)
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