Active Tectonics and Seismic Potential of Alaska by Jeffrey T. Freymueller, Peter J. Haeussler, Robert L.

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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 glossy integrative precis all for the main amazing energetic tectonic structures in North America.

Encompassing seismology, tectonics, geology, and geodesy, it comprises papers that summarize the kingdom of data, together with history fabric for these strange with the quarter; handle international hypotheses utilizing facts from Alaska; and attempt very important international hypotheses utilizing info 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 comparable constructions and their position in accommodating everlasting deformation of the overriding plate, and
  • regional integration and large-scale versions and using information from Alaska to deal with very important international questions and hypotheses.

The book's 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 should be anticipated to upward thrust with time as extra EarthScope info develop into available.

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They used only three VLBI sites, neglecting Kodiak, Sand Point, and Cape Yakataga, because of the large elastic component to the deformation of those sites. They presented four models, which differed in the fault slip rates and in the relative weights of VLBI and slip rate data. The models predict fault slip rates and velocity vectors at points, and the latter can be compared to GPS velocities as long as we are careful to account for elastic deformation; their models did not include any component of elastic strain.

Its southeastern boundary is uncertain; nominally, we take it to be the Denali fault and its connection to the Chatham Strait fault, although GPS data show no obvious relative motion across the Chatham Strait fault. Its boundary with North America may be diffuse, or may involve faults in the rugged and icecovered Coast Mountains not presently known to be active. Freymueller et al. 33 Figure 17. Block model with block velocities relative to North America. Block boundaries are shown with thick lines, and other active faults with thin lines.

The slip deficit distribution for these periods, corrected for 1964 viscoelastic postseismic deformation, is shown in Plate 2b, and the region of slow slip in 1998–2001 is highlighted in that figure. Comparing the SSE period to the time before and after, there were no changes to the slip deficit distribution in the shallow part of the seismogenic zone that corresponds to the main 1964 rupture area. The downdip extent of the region of slip deficit estimated during the SSE period compares very well with the 1964 main slip zone, and the main slip zone appears to be kinematically locked during the entire study period.

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