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Dive into the research topics where Andy Armstrong is active.

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Featured researches published by Andy Armstrong.


Geological Society, London, Memoirs | 2016

An ultrahigh-latitude submarine channel: Northern Chukchi Rise

Larry A. Mayer; James V. Gardner; Andy Armstrong

Eight dedicated mapping cruises have taken place since 2003 in the mostly ice-covered waters north of Alaska to 83.5° N (Mayer et al. 2010), using the USCG Icebreaker Healy . Due to the generally heavy sea-ice conditions (the sea-ice edge was typically encountered at about 75° N), most surveys involved single multibeam swaths that covered specific targets. During the 2012 record sea-ice minimum, however, the ice margin was at about 80° N which allowed mapping using overlapping multibeam surveys (Mayer & Armstrong 2012). The complete-coverage surveys of 2012 revealed a previously unknown submarine channel (informally named ‘Weather Channel’) that is one of the most northerly submarine channels mapped to date and is probably related to glacial processes. ‘Weather Channel’ is about 160 km long, first appearing at a depth of about 3300 m on a relatively flat basin floor in what is probably a pull-apart basin separating the northern extension of Chukchi Rise from Chukchi Cap (Brumley et al. 2009). It lies in the middle of the basin, approximately 13 km north of the base of Chukchi Cap and 9 km south of the topographic highs of the …


Quaternary Research | 2005

Multibeam bathymetric and sediment profiler evidence for ice grounding on the Chukchi Borderland, Arctic Ocean

Martin Jakobsson; James V. Gardner; Peter R. Vogt; Larry A. Mayer; Andy Armstrong; Jan Backman; Rick T Brennan; Brian R. Calder; John K. Hall; Barbara J. Kraft


Archive | 2011

The Mariana Trench: A New View Based on Multibeam Echosounding

James V. Gardner; Andy Armstrong


Archive | 2008

Recent Mapping and Sampling on the Chukchi Borderland and Alpha/Medeleev Ridge

Larry A. Mayer; Kelley Brumley; A Andronikov; Dale N. Chayes; Andy Armstrong; Brian R. Calder; John K. Hall; W C Clyde; W A Bothner; James V. Gardner


Archive | 2007

Multibeam Bathymetry Mapping for U.S. UNCLOS Concerns: A Gold Mine for Marine Geology

Andy Armstrong; James V. Gardner; Larry A. Mayer


Archive | 2005

New Views of the U.S. Continental Margins

James V. Gardner; Larry A. Mayer; Andy Armstrong


International Hydrographic Review | 2005

On the Use of Historical Bathymetric Data to Determine Changes in Bathymetry: An Analysis of Errors and Application to Great Bay Estuary, NH

Martin Jakobsson; Andy Armstrong; Brian R. Calder; Lloyd C Huff; Larry A. Mayer; Larry G. Ward


Archive | 2002

The Compilation and Analysis of Data Relevant to a U.S. Claim Under United Nations Law of the Sea Article 76: A Preliminary Report

Larry A. Mayer; Martin Jakobsson; Andy Armstrong


Archive | 2011

U.S. Law of the Sea Cruise to Map the Foot of the Slope and 2500-m Isobath of the U.S. Arctic Ocean Margin

Larry A. Mayer; Andy Armstrong


Archive | 2009

Mapping in the Arctic Ocean in Support of a Potential Extended Continental Shelf

Larry A. Mayer; Andy Armstrong; James V. Gardner

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Larry A. Mayer

University of New Hampshire

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James V. Gardner

University of New Hampshire

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Brian R. Calder

University of New Hampshire

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Shachak Pe'eri

University of New Hampshire

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Lee Alexander

University of New Hampshire

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Rick T Brennan

University of New Hampshire

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Chukwuma Azuike

University of New Hampshire

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John K. Hall

University of New Hampshire

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