DOCSLIB.ORG

Information to Users

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Information to Users Deformation Of Alaskan Volcanoes Measured Using Sar Interferometry And Gps Item Type Thesis Authors Mann, Doerte Download date 28/09/2021 20:42:27 Link to Item http://hdl.handle.net/11122/8622 INFORMATION TO USERS This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer. The quality of this reproduction is dependent upon the quality of the copy submitted.Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction. In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion. Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand comer and continuing from left to right in equal sections with small overlaps. ProQuest Information and Learning 300 North Zeeb Road, Ann Arbor, Ml 48106-1346 USA 800-521-0600 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. NOTE TO USER This reproduction is the best copy availabie. UMI' Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. DEFORMATION OF ALASKAN VOLCANOES MEASURED USING SAR INTERFEROMETRY AND GPS A THESIS Presented to the Faculty of the University of Alaska Fairbanks in Partial Fulfillment of the Requirements for the Degree of DOCTOR OF PHILOSOPHY By Dorte Mann. Dipl. Geophys. Fairbanks, Alaska August 2002 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. UMI Number: 3059724 ___ ® UMI UMI Microform 3059724 Copyright 2002 by ProQuest Information and Learning Company. All rights reserved. This microform edition is protected against unauthorized copying under Title 17, United States Code. ProQuest Information and Learning Company 300 North Zeeb Road P.O. Box 1346 Ann Arbor, Ml 48106-1346 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. DEFORMATION OF ALASKAN VOLCANOES MEASURED USING SAR INTERFEROMETRY AND GPS By Dorte M ann RECOMMENDED: APPROVED: 0 (a )ogAcJI _____________ Dean. College of Science. Engineering ancl Mathematics Dean m the Graduate School 7 - 9 Date Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Abstract Geodetic measurements using the Global Positioning System (GPS) and synthetic aperture radar interferometry (InSAR) show deformation of Okmok. Westdahl. and Fisher volcanoes in the Alaska-Aleutian arc. This thesis shows the variety of deformation signals observed, presents models for the observations, and interprets them in terms of underlying processes. InSAR data show deflation of Okmok caldera during its last eruption in 1997, preceded and followed by inflation of smaller magnitude. Modeling shows that the main deformation source, interpreted as a central magma reservoir, is located at 2.5 to 5.0 km depth beneath the approximate center of the caldera, and 5 km away from the active vent. Mass balance calculations and comparison with the long-term eruptive frequency indicate that Okmok may be supplied with magma continuously from a deep source. GPS measurements between 1998 and 2001 show inflation of Westdahl volcano, with a source located about 7 km beneath the summit. The combined subsurface volume increase measured during the GPS and an earlier InSAR observation period [Lu et al., 2000a] ac­ counts for at least 15% more than the volume erupted from Westdahl in 1991-92, suggesting that an eruption of that size could occur at any time. Neighboring Fisher caldera shows subsidence and contraction across the caldera center that is not related to any eruptive activity. The main mechanisms to explain this deforma­ tion are degassing and contractional cooling of a shallow magma body, or depressurization of Fisher’s hydrothermal system, possibly triggered by an earthquake in the vicinity of the caldera in 1999. A systematic coherence analysis of SAR interferograms documents the cooling history of the 1997 Okmok lava flow. The flow is incoherent directly after emplacement, but coherence increases as more time has passed since the eruption, and also the shorter the period spanned by the interferogram. Coherence is regained three years after the eruption. This corresponds to the time when the 20 m thick flow has solidified, indicating that flow mobility is the dominant factor degrading coherence on young lava flows. Based on these results, InSAR coherence analysis can be used to derive the minimum thickness of a lava flow. 3 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Contents List of Figures ......................................................................................................................... 8 List of Tables ............................................................................................................................. 11 Acknowledgements ................................................................................................................... 12 1 Introduction 13 1.1 General ............................................................................................................................ 13 1.2 Thesis Content and Organization ............................................................................... 15 2 Deformation associated with the 1997 eruption of Okmok volcano, Alaska1 17 2.1 A b s tra c t............................................................................................................................ 17 2.2 Introduction ..................................................................................................................... 18 2.3 O b s e rv a tio n s .................................................................................................................. 19 2.3.1 SAR images and interferograms ..................................................................... 19 2.3.2 Deformation episodes ..................................................................................... 21 2.4 Modeling ........................................................................................................................ 24 2.4.1 The Models .......................................................................................................... 24 2.4.2 Data selection and procedures ........................................................................ 28 2.4.3 Misfit calculation for wrapped interferograms .......................................... 28 2.5 Subsurface volume change, magma volume and pressure change ....................... 29 2.6 Modeling results and interpretation ............................................................................ 31 2.6.1 Pre-eruptive inflation and lateral magma transport (1992-1995) . 31 2.6.2 Co-eruptive deflation (1995-1997) ................................................................. 33 4 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. 5 2.6.3 Post-eruptive inflation (1997-1998).............................................................. 35 2.6.4 Summary ............................................................................................................ 36 2.7 Discussion ........................................................................................................................ 37 2.7.1 Temporal development of deformation and magma volume .................. 37 2.7.2 Lateral magma transport .............................................................................. 40 2.7.3 Proposed structural model .............................................................................. 41 2.8 Conclusions ..................................................................................................................... 42 2.9 Acknowledgments ........................................................................................................... 43 3 Cooling and structure of the 1997 Okmok lava flow, observed by coherence analysis of SAR interferograms2 44 3.1 A b s tra c t........................................................................................................................... 44 3.2 Introduction ..................................................................................................................... 45 3.3 Coherence analysis ....................................................................................................... 47 3.3.1 Coherence in SAR interferograms ................................................................. 47 3.3.2 Data selection and analysis .......................................................................... 48 3.3.3 Observations ..................................................................................................... 49 3.4 Cooling model ...................................................................................................................
Load more

Recommended publications
  • Annual Management Report for the Shellfish Fisheries of the Westward Region, 2001
    ANNUAL MANAGEMENT REPORT FOR THE SHELLFISH FISHERIES OF THE WESTWARD REGION, 2001 By Westward Region Shellfish Management Staff Regional Information Report1 No. 4K02-54 Alaska Department of Fish and Game Division of Commercial Fisheries 211 Mission Road Kodiak, Alaska 99615 December 2002 1 The Regional Information Report Series was established in 1987 to provide an information access system for all unpublished division reports. These reports frequently serve diverse ad hoc informational purposes or archive basic uninterpreted data. To accommodate timely reporting of recently collected information, reports in this series undergo only limited internal review and may contain preliminary data; this information may be subsequently finalized and published in the formal literature. Consequently, these reports should not be cited without prior approval of the author or the Division of Commercial Fisheries. WESTWARD REGION SHELLFISH MANAGEMENT STAFF Denby S. Lloyd Regional Supervisor, Kodiak Wayne K. Donaldson Regional Management Biologist, Kodiak David R. Jackson Kodiak/Alaska Peninsula Area Management Biologist, Kodiak Forrest Bowers Bering Sea/Aleutian Isl. Area Management Biologist, Dutch Harbor Mary Schwenzfeier Shellfish Observer Program Coordinator, Dutch Harbor Michael P. Ruccio Assistant Area Management Biologist, Kodiak Jeffery P. Barnhart Scallop Observer Program Coordinator, Kodiak Michael Cavin Assistant Area Management Biologist, Dutch Harbor Shari Coleman Assistant Shellfish Observer Program Coordinator, Dutch Harbor Carrie L. Worton
    [Show full text]
  • Geology of Little Sitkin Island, Alaska
    Geology of Little Sitkin Island By G. L. SNYDER INVESTIGATIONS OF ALASKAN VOLCANOES GEOLOGICAL SURVEY BULLETIN 1028-H Prepared in cooperation with the Departments of the Army, Navy, and Air Force UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1959 UNITED STATES DEPARTMENT OF THE INTERIOR FRED A. SEATON, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director The U. S. Geological Survey Library has cataloged this publication as follows : Snyder, George Leonard, 1927- Geology of Little Sitkin Island, Alaska. Washington, U. S. Govt. Print. Off., 1958. - vi, 169-210 p. illus., 2 maps (1 fold. col. in pocket) tables. 24 cm. (U. S. Geological Survey. Bulletin 1028-H. Investigations of Alas- kan volcanoes) Prepared in cooperation with the Departments of the Army, Navy, and Air Force. "References cited" : p. 206-207. 1. Rocks, Igneous. 2. Petrology Aleutian Islands. 3. Little Sitkin Island. I. Title. (Series: U. S. Geological Survey. Bulletin 1028-H. Series: U. S. Geological Survey. Investigations of Alaskau volcanoes) 557.98 For sale by the Superintendent of Documents, U. S. Government Printing Office Washington 25, D. C. PKEFACE In October 1945 the War Department (now Department of the Army) requested the Geological Survey to undertake a program of volcano investigations in the Aleutian Islands-Alaska Peninsula area. The field studies were made during the years 1946-1954. The results of the first year's field, laboratory, and library work were hastily assembled as two administrative reports, and most of these data have been revised for publication in Geological Survey Bulletin 1028. Part of the early work was published in 1950 in Bulletin 974-B, Volcanic activity in the Aleutian arc, and in 1951 in Bulletin 989-A, Geology of Buldir Island, Aleutian Islands, Alaska, both by Robert R.
    [Show full text]
  • Geology of Little Sitkin Island Alaska
    Geology of Little Sitkin Island Alaska 4G, 2. SNYDER INVESTIGATIONS OF ALASKAN VOLCANOES GEOLOGICAL SURVEY BULLETIN 1028-H Pregared in coogeration with the Departments of the Army, Navy, asd Air Force PROPERM OF STA~DIVISION OF hA?.!Ts AND MINEAAU BOX 657 Noma A& UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1959 UNITED STATES DEPARTMENT OF THE INTERIOR FRED A. SEATON, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director Tat U. 8, (leologlcal Surrey Llbrarl has catnloged thin pnbllcatlon am Zollowm: Snyder, George Leonard, 19%- Geology of Little Sitkin Island, Alaska Washington, U. S. Govk Print. Off., 1958. d, 189-210 p. Illus., 2 maps (1 fold. WL in pocket) tables. 24 cm. (U. B. (3eoIogieal Plnwey. BnlletLe 1OZg-H. Investlgattons of Alasl Ban volcanm) Prepad in -ration with the Departmate vf the Army, Navy. and Air Force. "Beierencea cited" : p. 20%207. 1. Boce Ignmm. 2. Petmlom-Aleutian Islands. 8. LEffle Bltkln Xsland. L Title. (Serlea: U. 51. Ueologlcal Survey, Bulletin 102ELH. Series: U, 8. Geological Bnmey. Inve~tigation~of AlaskAn volcanw!B) 557.98 PREFACE In Octobr 1945 the War Dapsrtment (now Department of the Army) rquWth% Qeological Smey tn nndertake a pmgmm of volcano inv&igations in the Meutinn Islanth-AlaskaPeninsula area. The Geld studies wmmade dm%g the years 194b1954. The results of the first year's field, laboratory, and librargr work were hastily asembled as two administrative reports, and most of hhw data have been revid for publication in Geological Survey Bulletin 1028. Part of Ehe mrly work was published in 1950 in Bulletin WPB,Volcanio sctivity in tbe Aleutian are, and in 1951 in Bdlstin 989-4 (30log.g of Buldir Island, Aleutian Islands, Mda,both by Rob& R Coats.
    [Show full text]
  • Western Aleutian Islands -Alaska I
    Geologic Reconnaissance of Semisopochnoi Island 'Western Aleutian Islands -Alaska i By ROBERT R. COATS ..INVESTIGATIONS OF ALASKAN VOLCANOES GEOLOGICAL SURVEY BULLETIN 1028-O > Prepared in cooperation with the Office, t Chief of Engineers, U. S. Army UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1959 UNITED STATES DEPARTMENT OF THE INTERIOR FRED A. SEATON, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington 25, D.C. Price $1.25 (paper cover) PREFACE In October 1945 the War Department (now Department of the Army) requested the Geological Survey to undertake a program of volcano investigations in the Aleutian Islands-Alaska Penin­ sula area. The first field studies, under the general direction of G. D. Robinson, were made during the years 1946-48. The re­ sults of the first year's field, laboratory, and library work were hastily assembled as two administrative reports, and most of these data have been revised for publication in Geological Sur­ vey Bulletin 1028. Part of the early work was published in 1950 in Bulletin 974-B, "Volcanic Activity in the Aleutian Arc," and in 1951 in Bulletin 989-A, "Geology of Buldir Island, Aleutian Islands, Alaska," both by Robert R. Coats. During the years 1949-54 additional fieldwork was carried out under the direction of H. A. Powers. Unpublished results of the early work and all of the later studies are being incorporated as parts of Bulletin 1028. The geological investigations covered by this report were re­ connaissance. The factual information presented is believed to be accurate, but many of the tentative interpretations and conclu­ sions will be modified as the investigations continue and knowl­ edge grows.
    [Show full text]
  • Alaska Exclusive Economic Zone: Ocean Exploration and Research Bibliography
    Alaska Exclusive Economic Zone: Ocean Exploration and Research Bibliography Hope Shinn, Librarian, NOAA Central Library Jamie Roberts, Librarian, NOAA Central Library NCRL subject guide 2020-08 doi: 10.25923/k182-6s39 September 2020 U.S. Department of Commerce National Oceanic and Atmospheric Administration Office of Oceanic and Atmospheric Research NOAA Central Library – Silver Spring, Maryland Table of Contents Background ............................................................................................................................................... 3 Scope ......................................................................................................................................................... 3 Sources Reviewed ..................................................................................................................................... 7 Acknowledgements ................................................................................................................................... 7 Section I: Aleutian Islands ......................................................................................................................... 8 Section II: Aleutian Islands, Beaufort Sea, Bering Sea, Chukchi Sea, Gulf of Alaska ............................... 26 Section III: Aleutian Islands, Bering Sea, Gulf of Alaska .......................................................................... 27 Section IV: Aleutian Islands, Central Gulf of Alaska ...............................................................................
    [Show full text]
  • Reconnaissance Geology of Some Western Aleutian Islands, Alaska
    Reconnaissance Geology of Some Western Aleutian Islands, Alaska ^ By ROBERT R. COATS GEOLOGICAL SURVEY BULLETIN 1028-E Prepared in cooperation with the Office, Chief of Engineers, U. S. Army '--A -V UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1956 UNITED STATES DEPARTMENT OF THE INTERIOR Fred A. Seaton, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director For sale by the Superintendent of Documents, U. S. Government Printing Office Washington 25, D. C. PREFACE In October 1945 the War Department (now Department of the Army) requested the Geological Survey to undertake a program of volcano investigations in the Aleutian Islands-Alaska Peninsula area. The first field studies, under general direction of G. D. Robinson, were begun as soon as weather permitted in the spring of 1946. The results of the first year's field, laboratory, and library work were as­ sembled as two administrative reports. Part of the data was published in 1950 in Geological Survey Bulletin 974-B, Volcanic activity in the Aleutian arc, by Robert R. Coats. The remainder of the data has been revised for publication in Bulletin 1028. The geologic and geophysical investigations covered by this report were reconnaissance. The factual information presented is believed to be accurate, but many of the tentative interpretations and conclu­ sions will be modified as the investigations continue and knowledge grows. The investigations of 1946 were supported almost entirely by the Military Intelligence Division of the Office, Chief of Engineers, U. S. Army. The Geological Survey is indebted to the Office, Chief of Engineers, for its early recognition of the value of geologic studies in the Aleutian region, which made this report possible, and for its continuing support.
    [Show full text]
  • Ocean Floor Structures Northeastern Rat Islands Alaska
    Ocean Floor Structures Northeastern Rat Islands Alaska By GEORGE L. SNYDER INVESTIGATIONS OF ALASKAN VOLCANOES GEOLOGICAL SURVEY BULLETIN 1028-G Preflared in cooperation with the Deflartments of the Army, Navy, alzd Air Force UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1957 UNITED STATES DEPARTMENT OF THE INTERIOR FRED A. SEATON, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director __ -- For sale by the Superintendent of Documents. U. S. Government Printing Offlce Washington 25, D. C. - Price 55 cents (paper cover) PREFACE The U. S. Geological Survey, in response to the October 1945 re- quest of the War Department (now Department of the Army), made a reconnaissance during 1946-54 of volcanic activity in the Aleutian Islands-Alaska Peninsula area. Results of the first year’s research, field, and laboratory work were hastily assembled as two adminis- trative reports to the War Department. Some of the early findings, as recorded by Robert R. Coats, were published in Bulletin 974-B (1950), Volcanic activity in the Aleutian arc, and in Bulletin 989-A (1951), Geology of Buldir Island, Aleutian Islands, Alaska. Unpublished results of the early work and all data gathered in later studies are being published as separate chapters of Bulletin 1028. The investigations of 1946 were financed principally by the Military Intelligence Division of the Office, Chief of Engineers, U. S. Army. From 1947 until 1955 the Departments of the Army, Navy, and Air Force jointly furnished financial and logistic assistance. m 423218-57 Faze 161 161 164 167 ILLUSTRATIONS INVESTIGATIONS OF ALASKAN VOLCANOES ._--- OCEAN FLOOR STRUCTURES, NORTHEASTERN RAT ISLANDS, ALASKA By GEORGE L.
    [Show full text]
  • Aleutian Islands Unit, Alaska Maritime National Wildlife Refuge, May 18 to May 27, 1982
    TRIP REPORT-MAY 18-27, 1982 by Zeillemaker, C. Fred .IS FWLB 1338 .! TRIP REPORT 1..l1JRAR~ ALEUTIAN ISLANDS UNIT c ALASKA MARITIME NATIONAL WILDLIFE REFUGE U@i\FWS May 18 to May 27, 1982 _A;."l.Chorage Personnel: Chris J. Ambroz, Volunteer, AMNWR (Homer) Fredric G. Deines, Wildlife Biologist, AIU-AMNWR (Adak) Donald E. Dragoo, Volunteer, AMNWR (Homer) Douglas J. Forsell, Wildlife Biologist, Seattle NFRC (Anchorage) Evan V... Klett, Assistant Refuge Manager, AIU-M1NWR (Adak) Jay E. Hamernick, Volunteer, AIU-AMNWR (Adak) c. Fred Zeillemaker, Refuge Manager, AIU-AMNWR (Adak) Charter Vessel "Sea Spray" Crew: Agust Gudjonsson, Captain Ted Blenkers, Cook Ed Mosiman, Engineer May 18 Depart Sweeper Cove Pier 9, Adak, aboard.the "Sea Spray" at 0930 hours, proceeding a~ about 10 knots. Conducted periodic seabird and marine mammal transects along a course north of Adak, Kanaga, Bobro~ Tanaga, and Gareloi Islands. •·.: May 19 Passed south of Semisopochnoi Island at 0300 hours. Continued :.... ( periodic seabird and marine mammal transects along a course north of Little Sitkin, Davidof, Khvostof and Kiska islands. Arrived off the northwest side of Buldir Island at about 200.0 hours. Put a landing party ashore to inspect the Buldir cabin and tent frame. Underway at about 2200 hours for ~gattu Island. May 20 Arrived off east side of .Agattu at about 0545 hours. Prepared material and personnel for landing at Cove. All hands set up base camp in the cabin at Aga Cove. Jay Hamernick and Fred Zeillemaker remained on Agattu to complete setting up camp and initiate Aleutian Canada goose survey. The "Sea Spray" continued on to Shemya Island, but1 due to sea conditions, could not load supplies required for work at Nizki Island.
    [Show full text]
  • Geologic Reconnaissance of Kiska Island Aleutian Islands, Alaska
    Geologic Reconnaissance of Kiska Island Aleutian Islands, Alaska By ROBERT R. COATS, WILLIS H. NELSON, RICHARD Q. LEWIS, and HOWARD A. POWERS INVESTIGATIONS OF ALASKAN VOLCANOES ' X GEOLOGICAL SURVEY BULLETIN 1028-R Prepared in cooperation with the Office, Chief of Engineers, U.S. Army UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1961 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director For sale i-.y the Superintendent of Documents, U.S. Government Printing Office Washington 25, D.C. PREFACE In October 1945 the War Department (now Department of the Army) requested the Geological Survey to undertake a program of volcano investigations in the Aleutian Islands-Alaska Peninsula area. The first field studies, under general direction of G. D. Robinson, were begun as soon as weather permitted in the spring of 1946. The results of the first year's field, laboratory, and library work were assembled as two administrative reports. Part of the data was published in 1950 in Geological Survey Bulletin 974-B, "Volcanic Activity in the Aleu­ tian Arc," by Robert R. Coats. The remainder of the data has been revised for publication in Bulletin 1028. The investigations of 1946 were supported almost entirely by the Military Intelligence Division of the Office, Chief of Engineers, U.S. Army. The Geological Survey is indebted to the Office, Chief of Engineers, for its early recognition of the value of geologic studies in the Aleutian region, which made this report possible, and for its continuing support. iii CONTENTS Page Abstract____.___.____.______.____________________ 563 Introduction_________________ _______________ ___ ____ 563 * Regional setting of Kiska Island__-___--__--_-__-__________________ 564 Local topography.
    [Show full text]
  • Collections from the Aleutians and Other Bering Sea Islands, Alaska
    * Pycnogonida of the Western Pacific Islands, XI: Collections from the Aleutians and Other Bering Sea Islands, Alaska C. ALLAN CHILD I SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY • NUMBER 569 SERIES PUBLICATIONS OF THE SMITHSONIAN INSTITUTION Emphasis upon publication as a means of "diffusing knowledge" was expressed by the first Secretary of the Smithsonian. In his formal plan for the Institution, Joseph Henry outlined a program that included the following statement: "It is proposed to publish a series of reports, giving an account of the new discoveries in science, and of the changes made from year to year in all branches of knowledge." This theme of basic research has been adhered to through the years by thousands of titles issued in series publications under the Smithsonian imprint, commencing with Smithsonian Contributions to Knowledge in 1848 and continuing with the following active series: Smithsonian Contributions to Anthropology Smithsonian Contributions to Astrophysics Smithsonian Contributions to Botany Smithsonian Contributions to the Earth Sciences Smithsonian Contributions to the Marine Sciences Smithsonian Contributions to Paleobiology Smithsonian Contributions to Zoology Smithsonian Folklife Studies Smithsonian Studies in Air and Space Smithsonian Studies in History and Technology In these series, the Institution publishes small papers and full-scale monographs that report the research and collections of its various museums and bureaux or of professional colleagues in the world of science and scholarship. The publications are distributed by mailing lists to libraries, universities, and similar institutions throughout the world. Papers or monographs submitted for series publication are received by the Smithsonian Institution Press, subject to its own review for format and style, only through departments of the various Smithsonian museums or bureaux, where the manuscripts are given substantive review.
    [Show full text]
  • Using Multiple Regression Models to Understand the Influence of Geologic History, Topography, Island Size, Isolation and Disper
    Using Multiple Regression Models to Understand the Influence of Geologic History, Topography, Island Size, Isolation and Dispersability on Plant Community Assemblage in the Western Aleutian Islands Item Type Poster Authors Garroutte, Monte Daniel Download date 26/09/2021 11:19:00 Link to Item http://hdl.handle.net/11122/1509 Using Multiple Regression Models to Understand the Influence of Geologic History, Topography, Island Size, Isolation and Dispersability on Plant Community Assemblage in the Western Aleutian Islands Monte Daniel Garroutte University of Alaska Museum of the North Herbarium (ALA) & Department of Biology and Wildlife Introduction: Island groups are often subject to habitat filters and dissimilar dispersal Influence From the Environment or Seabirds? Results & Discussion: We collected species occurrence data for 382 species across the sources, and as a result may reflect dissimilar plant assemblages between islands. Several recent papers (Croll et al., 2005; Maron et al., 2006) suggest that seabirds Western Aleutians. There were on average many more collections from larger islands and from those islands with WWII activity. Several islands in the region, including the large Though the Aleutian Islands have likely acted as a route for plant dispersal across the have created a habitat filter across the Aleutian Islands through chemical and physical soil disturbance. Our analysis will determine if seabird influence has Semisopochnoi Island, have incomplete floras, and more effort should be directed into North Pacific, many continental endemics have colonized the islands but have not shaped the regional phylogenetic structure of plant communities. basic botanical collecting. The island with the largest floral diversity is Attu Island, which dispersed over the chain as a whole (Talbot, 1994).
    [Show full text]
  • Aleutian Islands
    324 ¢ U.S. Coast Pilot 9, Chapter 7 Chapter 9, Pilot Coast U.S. 180°W 176°W 172°W 168°W 164°W Chart Coverage in Coast Pilot 9—Chapter 7 NOAA’s Online Interactive Chart Catalog has complete chart coverage http://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml 16011 172°W 176°W 58°N St. Paul Island BERING SEA St. George Island 56°N Unimak Island 16528 16518 16531 16500 16517 54°N S 16515 16433 16435 D L A N 16511 A L E U T I A N I S 16522 16501 16520 Attu Island A 16421 16436 16480 M 16521 16430 U K 16514 T 16487 16490 A 16513 16463 Agattu Island P 16431 A S 16471 S S S 16441 A P 52°N 16432 A 16434 K 16423 Kiska Island T Adak Island I 16465 16486 16420 16442 16450 H C 16467 M A 16462 16440 16460 50°N 16012 26 SEP2021 NORTH PA CIFIC OCEAN 26 SEP 2021 U.S. Coast Pilot 9, Chapter 7 ¢ 325 Aleutian Islands (1) This chapter describes the Aleutian Islands and the 26 51°11.83'N., 179°50.46'W. 31 51°37.86'N., 171°34.53'W. many passes leading from the Pacific Ocean into the 27 52°39.35'N., 178°39.78'W. 32 51°15.27'N., 172°36.40'W. Bering Sea. Also described are the harbors of Dutch 28 53°13.18'N., 173°49.18'W. 33 50°21.63'N., 179°24.20'W. Harbor on Unalaska Island; Kuluk Bay on Adak Island; Massacre Bay on Attu Island; and many other smaller 29 53°02.71'N., 172°51.16'W.
    [Show full text]