By Jeffrey T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Göran Ekström
Published by means of the yank Geophysical Union as a part of the Geophysical Monograph Series.
This multidisciplinary monograph offers the 1st glossy integrative precis desirous about the main amazing energetic tectonic structures in North America.
Encompassing seismology, tectonics, geology, and geodesy, it contains papers that summarize the nation of data, together with historical past fabric for these surprising with the sector; deal with international hypotheses utilizing info from Alaska; and try vital worldwide hypotheses utilizing info from this region.
It is geared up 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 constructions and their position in accommodating everlasting deformation of the overriding plate, and
- regional integration and large-scale types and using info from Alaska to handle very important worldwide questions and hypotheses.
The book's e-book close to the start of the nationwide technology Foundation's EarthScope venture makes it particularly well timed simply because Alaska may be the least understood zone in the EarthScope footprint, and curiosity within the area could 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
As suggested by the alternative geometries explored by Fletcher , this solves one of the problems of the original model of Lahr and Plafker —which is where to put the western boundary of SOAK without predicting rapid extension of several mm/yr. 2 mm/yr relative to SOAK. However, this motion is not significant considering the present uncertainties in the block model. Because of the complexities in separating the subduction-related elastic strain and postseismic deformation from the block motion, we cannot yet test whether present convergence would occur across this region.
This is not evident in the GPS profiles across the fault, although contraction at the rate of up to 1–2 mm/yr cannot be ruled out given the precision of the pre-earthquake data (Figures 5 and 6). The development of the contractional belt in the northern foothills of the Alaska Range provides geologic evidence for net convergence across the Alaska Range [Bemis, 2004; Lesh and Ridgway, 2007], although the rate of convergence may be slow. These structures are most prominent from the Richardson Highway/Trans-Alaska Pipeline crossing at longitude 145°W, west to the western edge of the Kantishna Hills at longitude 152°W.
2004]. Low stress regions could also be regions that exhibit stick-slip behavior but fail at a relatively low shear stress, because of asperity size or some other form of weakness. Unless the frictional properties of the interface evolve rapidly in time, the asperities should be persistent features and successive great earthquakes will rupture one or more adjacent asperities. Although successive great earthquakes may differ in that each may rupture a different set of asperities, the slip distributions of successive ruptures in a given section of the margin will reflect the shape and distribution of the asperities.
Active Tectonics and Seismic Potential of Alaska by Jeffrey T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Göran Ekström