By Jeffrey T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Göran Ekström
Published through the yank Geophysical Union as a part of the Geophysical Monograph Series.
This multidisciplinary monograph offers the 1st glossy integrative precis fascinated by the main surprising lively tectonic platforms in North America.
Encompassing seismology, tectonics, geology, and geodesy, it comprises papers that summarize the nation of information, together with historical past fabric for these unexpected with the quarter; deal with worldwide hypotheses utilizing facts from Alaska; and try very important worldwide hypotheses utilizing information from this region.
It is prepared round 4 significant themes:
- subduction and nice earthquakes on the Aleutian Arc,
- the transition from strike slip to accretion and subduction of the Yakutat microplate,
- the Denali fault and similar buildings and their position in accommodating everlasting deformation of the overriding plate, and
- regional integration and large-scale versions and using information from Alaska to handle very important worldwide questions and hypotheses.
The book's booklet close to the start of the nationwide technological know-how Foundation's EarthScope undertaking makes it specially well timed simply because Alaska is likely to be the least understood quarter in the EarthScope footprint, and curiosity within the zone may be anticipated to upward thrust with time as extra EarthScope facts develop into available.
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Additional resources for Active Tectonics and Seismic Potential of Alaska
Our block model implies two additional significant seismic sources, corresponding to the Bering–North America plate boundary zone. , this volume]. , 1997], and the present GPS data in the region are not sufficient to further clarify how deformation is distributed. In addition, the block model predicts that slow but potentially significant relative motion may be occurring across the western Alaska Range, as a result of Bering–SOAK relative motion (Figure 17). There have been no historical large earthquakes in this area, and microseismicity is sparse.
3. 1. Block Model Constraints In our block model, much of Alaska lies on four blocks or plates with distinct motions relative to North America, the Bering Plate, Southern Alaska block (SOAK, largely equivalent to the Wrangell block of Lahr and Plafker ), Yakutat block, and Fairweather block. We use the term block here to represent any rigid piece of crust that moves independently of its neighboring regions. Relative motions of these blocks are shown in Figure 17 and block motions are listed in Table 3.
30 15 Years of GPS in Alaska Sites in Cold Bay (BAY1, 11 years) and Seldovia (SELD, 7 years) do not show significant deviations from their linear trends. This observation leads us to suggest that these creeping interfaces do not creep episodically in large SSEs, but instead creep on a steady basis. This is different from the case of the Japanese Ryukyu Islands, where the long-term strain from subduction is small because of biannually repeating SSEs that involve most or all of the potentially seismogenic interface [Kataoka and Heki, 2007; K.
Active Tectonics and Seismic Potential of Alaska by Jeffrey T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Göran Ekström