By Jeffrey T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Göran Ekström
Published by means of the yankee Geophysical Union as a part of the Geophysical Monograph Series.
This multidisciplinary monograph presents the 1st smooth integrative precis concerned about the main mind-blowing energetic tectonic structures in North America.
Encompassing seismology, tectonics, geology, and geodesy, it contains papers that summarize the country of data, together with historical past fabric for these surprising with the zone; deal with worldwide hypotheses utilizing facts from Alaska; and try out vital international hypotheses utilizing information from this region.
It is equipped 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 function in accommodating everlasting deformation of the overriding plate, and
- regional integration and large-scale types and using information from Alaska to handle very important international questions and hypotheses.
The book's e-book close to the start of the nationwide technology Foundation's EarthScope venture makes it in particular 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 info for Active Tectonics and Seismic Potential of Alaska
Postseismic deformation also impacts the slip deficit distribution on the plate interface. After a major earthquake, afterslip downdip of, and possibly within, the coseismic rupture zone is commonly observed, as it was for the 1964 earthquake. Regions undergoing afterslip may slip much faster than the average rate of plate motion, producing a negative slip deficit for a certain period. Thus, a kinematic snapshot taken shortly after an earthquake will not reflect the long-term slip deficit distribution, but afterslip appears to decay away over a small fraction of the earthquake recurrence time, and later the slip deficit distribution may reflect the long-term average between earthquakes.
In the asperity model, the plate interface is divided into a patchwork of high stress (asperities) and low stress regions. 28 15 Years of GPS in Alaska High stress regions are those that require a large shear stress to fail, whereas the low stress regions fail at much lower shear stresses. , 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.
This mismatch could be explained if the typical coseismic slip beneath Prince William Sound is larger than that of the 1964 earthquake, or if the total slip in smaller earthquakes is a significant fraction of that in great earthquakes, or if the shortest median intervals are the most representative in the paleoseismic record, or if very large creep events occur within the seismogenic region. Although these cannot be ruled out entirely, all are unlikely. However, if the slip rate beneath Prince William Sound is assumed to represent the Yakutat–North America motion, then 20–25 m of slip corresponds to a recurrence interval of 500–625 years, in excellent agreement with the average geologically observed recurrence interval.