scholarly journals Bristol Bay-Alaska Peninsula region, overview of 2004-2007 geologic research

2008 ◽  
Keyword(s):  
Bristol Bay ◽  
Alaska Peninsula

Crustal structure in the southern Bering Shelf and the Alaska Peninsula from inversion of surface-wave dispersion data

1989 ◽  
Vol 79 (6) ◽  
pp. 1883-1893
Author(s):  
Mansour Niazi ◽  
Kin-Yip Chun
Keyword(s):  
Crustal Structure ◽  
Velocity Structure ◽  
Structural Characteristics ◽  
Resolving Power ◽  
Surface Wave Dispersion ◽  
Bristol Bay ◽  
Alaska Peninsula ◽  
South Central ◽  
Bering Shelf ◽  
Group Velocities

Abstract Dispersion of surface waves in the southern Bering Shelf (Bristol Bay) and the Alaska Peninsula is investigated for a study of the regional crustal structure. Our data consist of five shallow earthquakes located along the Aleutian Arc and recorded by long-period, three-component seismographs sited in south-central Alaska. Both Love and Rayleigh group velocities are obtained through the application of the phase-matched filtering technique. The results are converted to equivalent pure-path data by appropriate adjustment using the published information for the continental Alaska. Treating the shear velocity of each layer as an independent parameter, the pure-path group velocities of Love and Rayleigh waves are jointly inverted in order to obtain a satisfactory agreement between the theoretical and the observed dispersion characteristics. Estimates of the resolving power of the inversion and uncertainty of the final velocity structure show substantial improvement over the previously published models. With their crustal thicknesses ranging between 33 and 36 km, none of the final models displays structural characteristics reminiscent of an oceanic crust. Over the northernmost path across the Bristol Bay, we found an indication of a weak low-velocity zone (five per cent reduction relative to the lid velocity) whose prominence diminishes towards the south.

Pottery from Hooper Bay Village, Alaska

1952 ◽  
Vol 18 (1) ◽  
pp. 18-29 ◽  
Author(s):  
Wendell Oswalt
Keyword(s):  
Organic Material ◽  
Preliminary Analysis ◽  
Good Time ◽  
Bristol Bay ◽  
Alaska Peninsula ◽  
The North ◽  
Great Area ◽  
The Face ◽  
Southern Section ◽  
Archaeological Excavations

Archaeological excavations along coastal Alaska from Cape Prince of Wales south to the Alaska Peninsula, a distance of approximately 2000 miles, were not initiated until 1948, when Giddings (1949) began work in the north at Cape Denbigh, and Larsen (1950) began at Bristol Bay in the southern section of this great area (see Fig. 7). During the summer of 1950 the writer carried out excavations at Hooper Bay, in approximately the center of the unworked region. Although the Hooper Bay Village material includes about 2000 artifacts and 1500 pot and lamp sherds, this paper is limited to a preliminary analysis of the cooking pots. The importance of pottery in determining the sequence within Eskimo prehistory has been neglected, in the face of the abundance of organic material which the frozen middens and house remains yield. The full significance of Alaskan pottery was not emphasized until de Laguna (1947) made her detailed study of the ware; also, Larsen (1950, p. 186) pointed out that potsherds are particularly good time indicators in a region like southwestern Alaska, where the preservation is poor. In this paper the Hooper Bay sherds are considered with particular reference to their position within the Bristol Bay-Norton Sound region and their relationship to finds of similar pottery in the north.

scholarly journals Bristol Bay and Alaska Peninsula 2004: Fieldwork and sample analyses compilation report

10.14509/7001 ◽  
2005 ◽  
Author(s):  
R. R. Reifenstuhl ◽  
R. D. Bailey ◽  
E. S. Finzel
Keyword(s):  
Bristol Bay ◽  
Alaska Peninsula

scholarly journals Preliminary summary of the 2005 field season: Port Moller, Herendeen Bay, and Dillingham areas, Bristol Bay Basin, Alaska Peninsula

10.14509/7190 ◽  
2005 ◽  
Author(s):  
P. L. Decker ◽  
E. S. Finzel ◽  
K. D. Ridgway ◽  
R. R. Reifenstuhl ◽  
R. B. Blodgett
Keyword(s):  
Bristol Bay ◽  
Alaska Peninsula ◽  
Field Season

Challenges Associated with Oil Spill Response in Remote Regions of Western Alaska

2001 ◽  
Vol 2001 (1) ◽  
pp. 209-211
Author(s):  
W. J. Hutmacher ◽  
R. Rodriguez
Keyword(s):  
North Pacific Ocean ◽  
Weather Conditions ◽  
Gulf Of Alaska ◽  
Geographic Area ◽  
Aleutian Islands ◽  
Federal State ◽  
Bristol Bay ◽  
Alaska Peninsula ◽  
Terrestrial Mammals ◽  
State And Local

ABSTRACT Western Alaska is, to say the least, remote. The area is vast, unforgiving at times, and notorious for offering rugged coastlines, severe weather conditions, and home to numerous species of birds, marine and terrestrial mammals, and fish. To get an understanding of the size of this state, Alaska spans about 20 degrees of latitude (1,200 miles) and more than 45 degrees of longitude (2,700 miles). The coastline area runs from Cape Puget in the Gulf of Alaska to the Alaska Peninsula, to the Aleutian Islands thence north to Barrow including, the Bering and Chukchi Seas, and thence east through the Beaufort Sea to the U.S.-Canada border. Traveling north to south, the region is classified as arctic, subarctic, or marine coastal. This paper will discuss the challenges faced by federal, state, and local agencies, and responders while responding to vessel casualties in the remote regions of Alaska. The geographic area of the state this paper will focus on is known as Western Alaska and is composed of the Alaska Peninsula, Aleutian Islands, the islands of Bristol Bay, and Pribilof Islands. The bodies of water surrounding Western Alaska are the Gulf of Alaska, North Pacific Ocean, Bristol Bay, and Bering Sea.

Age of Pre-late-Wisconsin Glacial-Estuarine Sedimentation, Bristol Bay, Alaska

1996 ◽  
Vol 45 (1) ◽  
pp. 59-72 ◽  
Author(s):  
Darrell S. Kaufman ◽  
Steven L. Forman ◽  
Peter D. Lea ◽  
Cameron W. Wobus
Keyword(s):  
Amino Acid ◽  
Temperature History ◽  
Last Interglacial ◽  
Geochronological Data ◽  
Bristol Bay ◽  
Intertidal Environment ◽  
Alaska Peninsula ◽  
Oxygen Isotope Stage ◽  
Before And After ◽  
Estuarine Sedimentation

AbstractPleistocene glacial-estuarine sediment deposited in an intertidal environment of northeastern Bristol Bay, southwestern Alaska, was dated using a variety of approaches, including infrared stimulated and thermoluminescence (IRSL and TL) techniques. Analysis of modern and 14C-dated Holocene tide-flat mud demonstrates that the bulk of sediment in this environment is reset by solar radiation, thereby lending confidence to ages obtained from similar Pleistocene deposits by luminescence techniques. IRSL seems to be especially well suited for dating, with resolution on time scales of <10,000 yr. The ages of tide-flat mud of the Nushagak Formation, derived from the Ahklun Mountains to the northwest of Bristol Bay, and of Halfmoon Bay drift, derived from the Alaska Peninsula to the southeast, suggest contemporaneous glacial-estuarine deposition related to independent glacial source areas about 75,000–80,000 yr ago. This age is consistent with other geochronological data that indicate a pre-late-Wisconsin and post-substage-5e age, including nonfinite 14C ages, a lack of interglacial indicators, and Old Crow tephra (∼140,000 yr) atop the drift, normal paleomagnetic inclinations, and amino acid (isoleucine) epimerization ratios (aIle/Ile). AIle/Ile ratios in Portlandia arctica(0.052 ± 0.003) from a marine-lag horizon at South Naknek beach, which separates Halfmoon Bay drift above from older glacial-estuarine drift below, are only slightly higher than in Mya truncata(0.041 ± 0.007) from last-interglacial Pelukian deposits at Nome. As laboratory heating experiments show that the two genera epimerize at similar rates, these data imply correlation of the marine lag at South Naknek beach with Pelukian deposits. Hence, glaciers on the Alaska Peninsula experienced major pre-late-Wisconsin advances both before and after the last interglaciation. Shells reworked into Halfmoon Bay drift yield aIle/Ile ratios of 0.028 ± 0.005 for Portlandiaat Second Point and 0.027 ± 0.001 for Hiatella arcticaat Etolin Point. Together with assumptions about the postdepositional temperature history, these ratios indicate that the shells are at least 55,000 yr, and probably closer to ∼90,000 yr, although the uncertainty in this age estimate is broad. The amino acid and luminescence data converge on an age between about 75,000, and 90,000 yr, late during oxygen-isotope stage 5, for a major ice advance far beyond late-Wisconsin limits.

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