Download e-book for kindle: Active Tectonics and Seismic Potential of Alaska by Jeffrey T. Freymueller, Peter J. Haeussler, Robert L.

By Jeffrey T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Göran Ekström

Published by way of the yank Geophysical Union as a part of the Geophysical Monograph Series.

This multidisciplinary monograph presents the 1st sleek integrative precis excited by the main excellent lively tectonic structures in North America.

Encompassing seismology, tectonics, geology, and geodesy, it contains papers that summarize the kingdom of information, together with historical past fabric for these strange with the quarter; deal with worldwide hypotheses utilizing information 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 vital international questions and hypotheses.

The book's ebook close to the start of the nationwide technology Foundation's EarthScope undertaking makes it specially well timed simply because Alaska may be the least understood sector in the EarthScope footprint, and curiosity within the zone could be anticipated to upward push with time as extra EarthScope facts turn into available.

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Most of the microseismicity locates within one of several NNE-trending bands (Figure 5). In addition, at least two M > 7 earthquakes occurred within this region in the first half of the 20th century. 3 event in 1937 had a left-lateral strike slip mechanism [Fletcher and Christensen, 1996], as have all of the other events in these zones that are large enough to compute a mechanism [Ratchkovski and Hansen, 2002]. 4 thrust event, located in the foothills of the Alaska Range [Fletcher and Christensen, 1996].

Kataoka, On the biannually repeating slow slip events at the Ryukyu Trench, southwestern Japan, submitted to J. Geophys. , 2008]. However, some of the segments we infer to creep have only campaign GPS data, and we cannot rule out a Ryukyu-like behavior for parts of the plate interface in Alaska. 4. , 1999]. In this conception, the Yakutat terrane subducts toward ~N35°W beneath the overriding plate (geologically, the Prince William terrane), whereas the Pacific plate subducts beneath the combined North American plate and Yakutat terrane.

2006], and thus had limited resolution for NE Kodiak (Plate 2a). , 2001; Fournier and Freymueller, 2007; Freymueller and Beavan, 1999]. Zweck et al. [2002] could not resolve any low slip deficit “gap” between the Kodiak segment of the 1964 rupture zone and the 1938 rupture zone, but given the data distribution a gap of a few 10s of km length would not be resolvable. There is a long segment dominated by creep extending from the Shumagin Islands west to the Fox Islands. The abundant data from the Sanak segment at the western end of the Alaska Peninsula require that the plate interface be creeping almost out to the trench; Freymueller and Beavan [1999] estimated that the maximum allowable width of a locked zone was 35 km, and only if its updip limit was exactly at the trench.

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