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  • Artikel  (17)
  • Seismology  (9)
  • Fisheries  (8)
  • 550 - Earth sciences
  • Woods Hole Oceanographic Institution  (17)
  • 2015-2019  (17)
  • 1
    Publikationsdatum: 2022-05-25
    Beschreibung: Seismic data obtained using borehole seismometers during the LFASE experiment (Stephen et al, 1989; Koelsch et al, 1990) are retrieved from the seafloor instrument package and converted to a data format more suitable for analysis with existing computer systems. This report describes the computer program CGG2ROSE2 for converting LFASE optical disk files recorded in CGG format by the data acquisition computer into standard ROSE format data files on a VAX/VMS computer. CGG2ROSE2 provides features for rearranging LFASE data into smaller segments, making corrections to timing information, and replacing file header information.
    Schlagwort(e): Seismic arrays ; Seismology
    Repository-Name: Woods Hole Open Access Server
    Materialart: Working Paper
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Woods Hole Oceanographic Institution
    Publikationsdatum: 2022-05-25
    Beschreibung: This technical report provides an overview of the LFASE data processing system. This software system is made up of over twenty-five programs which are used to acquire, reduce, and analyze acoustic seismic data collected during the Low Frequency Acoustic Seismic Experiment (LFASE) (Stephen et al, 1989; Koelsch et al, 1990). This report is directed at scientific and engineering personnel who wish to understand the overall LFASE data processing system as well as the individual processing procedures which are utilized during each stage of data reduction and interpretation. The report is also directed at programmers, data processors, technicians, and other individuals who plan to work with LFASE programs and data.
    Schlagwort(e): Seismic arrays ; Seismology
    Repository-Name: Woods Hole Open Access Server
    Materialart: Working Paper
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2022-05-25
    Beschreibung: The Low Frequency Acoustic Seismic Experiment (LFASE) was conducted to measure sound propagation and ambient noise above, at and below the sea floor. To this end an array consisting of four geophone nodes was introduced into a DSDP borehole. These seismic sensors were clamped inside the borehole at various depths below the ocean floor. The geophone array was connected by an electromechanical cable to a bottom reentry structure (BCU frame) housing the Data Recording Unit (DRU), the Data Telemetry Unit (DTU), the Bottom Control Unit (BCU) and the power supply.
    Beschreibung: Report prepared under Office of Naval Research Contracts #N00014-89-C-0018, N00014-89-J-1012 and Office of Naval Technology Contract #00014-90-C-0098, WHOI Project #13/1012
    Schlagwort(e): Seismic arrays ; Seismology ; Melville (Ship) Cruise HYDR01MV ; Melville (Ship) Cruise HYDR05MV ; Melville (Ship) Cruise HYDR09MV ; Melville (Ship) Cruise HYDR10MV
    Repository-Name: Woods Hole Open Access Server
    Materialart: Working Paper
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2022-05-25
    Beschreibung: Despite an absence of freshwater exploitation, the adult salmon run in the Matamek River, Quebec, declined during 1975-1980 to 〈23% of the level thought to occur there prior to 1967. Returns in 1979 and 1980 of adults tagged as smolts were 1.0% and 0.9%, respectively. Numbers of emigrating smolts and their corresponding adult returns are not significantly correlated, although we observed a trend towards more salmon (2 sea year fish) returning with larger numbers of migrating smolts. Since 1967 there is noted a decrease in the age at which returning adults smolted and females appear to now constitute a larger percentage of returning grilse and salmon. These, and other changes in life history characteristics, appear to be caused solely by commercial exploitation.
    Beschreibung: Prepared by the Woods Hole Oceanographic Institution and the Department of Recreation, Fish and Game of the Province of Quebec.
    Schlagwort(e): Atlantic salmon ; Fish populations ; Atlantic salmon ; Fisheries
    Repository-Name: Woods Hole Open Access Server
    Materialart: Technical Report
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2022-05-25
    Beschreibung: The Seafloor Borehole Array Seismic System (SEABASS) was originally developed to record autonomously on the seafloor the signals received on a four-sonde three-component borehole geophone array in the VLF band (2-50Hz)(Stephen eta!., 1994). The system is designed to use the wireline re-entry capability (Spiess, 1993; Spiess eta!., 1992) to install and retrieve the seafloor instrumentation (Figures 1 and 2). Following the successful demonstration of this technology on the LFASE (Low Frequency Acoustic-Seismic Experiment) project in September 1989, it was decided to extend the capability to broadband (1000sec-5Hz) borehole seismometers which could be used for permanent seafloor seismic observatories in the Ocean Seismic Network (Orcutt and Stephen, 1993; Purdy and Dziewonski, 1988; Purdy and Orcutt, 1995; Stephen, 1995; Sutton and Barstow, 1990; Sutton eta!., 1988; Sutton eta!., 1965). The Broadband Borehole Seismic System (B3S2) is the prototype system for permanent broadband borehole seismic observatories on the seafloor. It has three major components: i) a broadband borehole seismometer, the Teledyne 54000, modified for seafloor operations by Scripps-IGPP; ii) the re-entry system provided by Scripps-MPL; and iii) the seafloor recording system developed by WHO I. Because of the similarity of the seafloor recording system to SEABASS we have named this new system SEABASS-ll. This report discusses the development of SEABASS-Il at WHOI in the period from July 14, 1992 to January 31, 1996. The motivation for the project and a work statement are contained in WHOI proposals 7016 and 7016.1. This report is a collection of documentation prepared while the work was being carried out. Some of the issues discussed in early memos were subsequently changed. Modifications and further testing of SEABASS-ll, as well as final system integration tests with the borehole andreentry systems (both of which are also still being modified and tested) have still to be carried out in preparation for the OSN Pilot Experiment Cruise in Spring 1997. This is a preliminary report only and presents work in progress. It will be useful to the engineering team as a historical reference of the sequence of events in the development of SEABASS-ll but it should not be considered as a technical manual for the instrumentation.
    Schlagwort(e): Seismology ; Borehole gravimetry ; Ocean bottom ; Oceanographic instruments
    Repository-Name: Woods Hole Open Access Server
    Materialart: Working Paper
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2022-05-26
    Beschreibung: The broadband borehole seismic system (B3S2) is being developed as one component of the Ocean Seismic Network (OSN) Pilot Experiment which will be carried out at the OSN-1 Site off Hawaii in Winter 1998. The other major instruments being developed for the experiment are a Broadband Ocean Bottom Seismometer and a Shallow Buried Broadband Ocean Bottom Seismometer. B3S2 consists of four major components: 1) a borehole sonde with a re-entry guide, Teledyne 54000 broadband seismometer, and REFTEK digitizing system, 2) a seafloor acquisition and recording system (SEABASS), 3) a control vehicle for deploying the sonde in a borehole, and 4) shipboard command and control electronics. The deployment system is very similar to the SEABASS configuration used on LFASE (Stephen eta!, 1994). The purposes of the tests at Pinon Flat were: 1) to integrate the borehole sonde and seafloor and shipboard electronics which had been constructed by different groups: WHOI and SIO/IGPP; 2) test the combined subsystem in a wet borehole environment using actual cables and simulating seafloor conditions; and 3) acquire seismic ambient noise and earthquake data over approximately a three month period for comparison with known stations at the Pinon Flat Observatory.
    Beschreibung: This work was carried out under NSF Grants No. OCE-91-18943 and OCE No. OCE-95-05730: "A Broadband Borehole Seismometer for the Deep Ocean - Development and Land Testing"
    Schlagwort(e): Seismology ; Borehole gravity meters ; Ocean bottom ; Oceanographic instruments
    Repository-Name: Woods Hole Open Access Server
    Materialart: Working Paper
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2022-05-26
    Beschreibung: From the Forward: The idea for an Exploratory Workshop on Fisheries Sociology emerged from informal discussions held at the 1983 Rural Sociological Society meetings. Planning for the Exploratory Workshop was undertaken by the two of us (Bailey and Harris) with the assistance of Peter Sinclair and Christopher Vanderpool. We sought to identify persons working in different areas of the sociology of fisheries who could present review papers on their areas of inquiry. The papers in this volume are the result of that effort. At the same time, we sought to identify persons who would be interested in attending such a workshop• By combining our personal networks, the mailing list of the Fisheries Anthropologist at the National Marine Fisheries Service (Peter Fricke), and the list of attendees at two sessions on fisheries organized by Bailey at the 1984 Rural Sociological Society meetings, we developed a mailing list of 83 sociologists working on some aspect of fisheries. Invitations to attend the workshop were sent to those persons. In response to the invitation, 24 sociologists attended the Workshop. They came from eleven states, the District of Columbia and Puerto Rico, three provinces of Canada, and Norway. They represented work in both industrialized and developing nations, in subsistence, recreational and commercial fisheries, and in aquaculture.
    Beschreibung: This report was prepared with funds from the American Sociological Society; U.S. Department of Commerce, NOAA, Office of Sea Grant under Grant Number NA84AA-D-00033 (R/S-12); and the J . N. Pew, Jr. Charitable Trust.
    Schlagwort(e): Fisheries ; Fishery management
    Repository-Name: Woods Hole Open Access Server
    Materialart: Technical Report
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Woods Hole Oceanographic Institution
    Publikationsdatum: 2022-05-26
    Beschreibung: On the Low Frequency Acoustic - Seismic Experiment (LFASE), carried out at DSDP hole 534A in August, 1989, WHOI was responsible for acquiring data from a twelve channel borehole seismic array. Data were acquired both on-board while tethered to the array and autonomously in a seafloor package. Seismic source data (explosives and airguns) and ambient noise data were recorded. This report describes the nature of data acquired, reviews the data reduction procedure from field format to ROSE data format, and includes examples of the data. A total of918.6 Mbytes of data were acquired (769 Mbytes in the shipboard recording mode and 149.6 Mbytes in the seafloor recording mode). Approximately 85 explosive shots, 2000 airgun shots, and 10 hours of ambient noise data were recorded.
    Schlagwort(e): Seismic arrays ; Seismology
    Repository-Name: Woods Hole Open Access Server
    Materialart: Working Paper
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Woods Hole Oceanographic Institution
    Publikationsdatum: 2022-05-26
    Beschreibung: The Coastal Research Center activities for the period of 1984 to 1986 are described briefly. Major projects include: Assimilative Capacity-Buzzards Bay, Georges Bank book; Instrumentation-Experimental Seawater Flume, Sea Level Change - Measurement and Consequences; and Fisheries Ecology. General activities are also described.
    Beschreibung: Prepared under grants from the Andrew W. Mellon Foundation, the Richard King Mellon Foundation, and the Mobil Foundation, Incorporated.
    Schlagwort(e): Coasts ; Fisheries ; Ecology
    Repository-Name: Woods Hole Open Access Server
    Materialart: Technical Report
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    Woods Hole Oceanographic Institution
    Publikationsdatum: 2022-05-26
    Beschreibung: This project was initiated to accomplish the necessary research and documentation of existing seismic techniques and systems for the study of sediments and sedimentary structures in the oceans. In this respect , it is an 'inventory' of methods and techniques for looking at small-scale features or changes in structures lying from 10 to 1000 m beneath the sea floor. It attempts to assess the vertical and lateral resolution capabilities of existing and technically feasible seismic systems. Some of the questions posed are: how closely can we determine vertical variation such as sediment layer thickness and vertical variation with depth; also lateral coherence or its disruption by such agents as facies changes, thinning or thickening, slumping, faulting; the nature of the basement structure, its areal coherence, velocity structure and associated anomalies?
    Beschreibung: Prepared for the Sandia Laboratories under Contract 13-9944.
    Schlagwort(e): Seismology ; Ocean bottom
    Repository-Name: Woods Hole Open Access Server
    Materialart: Technical Report
    Standort Signatur Erwartet Verfügbarkeit
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