By Jeffrey T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Göran Ekström
Published via the yankee Geophysical Union as a part of the Geophysical Monograph Series.
This multidisciplinary monograph offers the 1st glossy integrative precis keen on the main remarkable lively tectonic structures in North America.
Encompassing seismology, tectonics, geology, and geodesy, it comprises papers that summarize the nation of data, together with historical past fabric for these surprising with the zone; deal with worldwide hypotheses utilizing info 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 function in accommodating everlasting deformation of the overriding plate, and
- regional integration and large-scale types 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 venture makes it particularly well timed simply because Alaska is likely to be the least understood sector in the EarthScope footprint, and curiosity within the zone should be anticipated to upward thrust with time as extra EarthScope information develop into available.
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Extra info for Active Tectonics and Seismic Potential of Alaska
The Bering plate includes the Bering Sea and much of western Alaska. , this volume]. , this volume]. Both of these regions have no GPS data and limited data on the active geology. SOAK is bounded on the north and northeast by the Denali and Totschunda faults and by the Fairweather–Totschunda connector fault, and on the south by the Alaska–Aleutian megathrust and the Chugach– St. Elias fault. The Chugach–St. Elias fault is here taken to be the boundary between SOAK and the Yakutat block, which is certainly a simplification of the tectonics of the St.
It is possible that there have been additional small events in this same location, but there were not enough continuous GPS sites to rule out temporally correlated noise as an explanation for variations in the time series of sites ATWC and ATW2. There is no unequivocal evidence for other large SSEs in Alaska during the period 1995–2007, although there are a few anomalies that might be SSEs, but might also be noise. The earliest GPS surveys from lower Cook Inlet, mainly from the Kenai Peninsula and Augustine volcano, suggest the possibility of a large transient event ending in 1996, but we have not been able to rule out the possibility that this represents a systematic error.
The Bering plate angular velocity is corrected for a unit conversion error in the original publication. 34 15 Years of GPS in Alaska rates of 12–13 mm/yr (with uncertainties of 2–4 mm/yr) at sites near the eastern part of the central Denali fault, and Mériaux et al. 7 mm/yr at Bull Creek west of the 2002 Denali fault earthquake rupture zone. These authors suggested that the Denali fault slip rate decreases systematically westward, which requires partitioning of slip onto other structures, probably thrust faults oblique to the Denali fault.
Active Tectonics and Seismic Potential of Alaska by Jeffrey T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Göran Ekström