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 glossy integrative precis fascinated about the main incredible lively tectonic platforms in North America.

Encompassing seismology, tectonics, geology, and geodesy, it comprises papers that summarize the country of information, together with heritage fabric for these unusual with the quarter; deal with worldwide hypotheses utilizing info from Alaska; and try vital international hypotheses utilizing information 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 comparable 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 worldwide questions and hypotheses.

The book's e-book close to the start of the nationwide technology Foundation's EarthScope undertaking makes it in particular well timed simply because Alaska might be the least understood zone in the EarthScope footprint, and curiosity within the quarter should be anticipated to upward push with time as extra EarthScope information develop into available.

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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. The persistence of asperities can be tested by comparing slip distributions of past great earthquakes to the slip deficit distributions inferred from geodetic measurements. As noted in the previous section, there is a good first-order correlation between the regions of high slip deficit identified by our geodetic data (Plate 2) and the asperities of the last set of great earthquakes.

Note that this earthquake occurred after the report of Lu and Wyss [1996] came out, so this hypothesis can be tested, with future work. Overall, however, there is no clear relation between the stress segments identified by Lu and Wyss [1996] and the locked and creeping zones we identified with geodesy. A study of stress variations using segment boundaries defined by the locked and creeping regions identified geodetically might prove enlightening. However, the fact that Lu and Wyss [1996] identified the 1986 earthquake rupture zone as a distinctive stress segment might mean that the earthquake stress drop is a significant fraction of the total stress in the shallow crust in subduction zones.

Elias orogen (the Yakataga segment of Figure 1b) is taken up on a single thrust fault, then the slip deficit since 1899 is again sufficient to produce an M ~ 8 earthquake if the entire segment ruptured at once. , 2003]. The fault segment to the west of the 2002 rupture could be long enough to rupture in a similar-sized earthquake in the future. , 2008]. However, even if the slip rate is only a few mm/yr, less frequent large earthquakes may be possible on this stretch of the fault, and paleoseismic investigations now underway may shed much more light on the potential of this part of the Denali fault system.

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