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  • 1
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    LFASE data processing system overview (2016)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: 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.
    Keywords: Seismic arrays ; Seismology
    Repository Name: Woods Hole Open Access Server
    Type: Working Paper
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  • 2
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    Bottom array specifications for the low frequency acoustic seismic experiment (LFASE) (2016)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: 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.
    Description: 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
    Keywords: 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
    Type: Working Paper
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  • 3
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    User's guide for PLOT_FINDIF (2006)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: PLOT_FINDIF is a MATLAB script which is used to plot output from the Woods Hole Oceanographic Institution (WHOI) Time Domain Finite Difference (TDFD) program called "Geoacoustic_TDFD" Both Geoacoustic_TDFD and PLOT_FINDIF are available from the ONR Ocean Acoustics Library (http://www.hlsresearch.com/oalib/). This script will plot both the snapshot and time series output from Geoacoustic_TDFD. To run this script you must have a MATLAB license and the complete suite of 32 m-files contained in the PLOT_FINDIF package. This code has been tested with MATLAB versions 6 and 7.
    Description: Funding was provided by the Office of Naval Research under Contract No. N00014-04-1-0090.
    Keywords: Time domain finite differences ; Bottom interaction ; Ocean acoustics
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
    Format: 15291344 bytes
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  • 4
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    A user’s manual for finite difference synthetic seismogram codes on the CYBER 205 and CRAY XMP-12 (2009)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: Over the past eight years, a software package has been developed to solve the elastic wave equation by the method of finite differences (Hunt et al., 1983; Stephen, 1983; Stephen, 1984a; Stephen, 1984b; Nicoletis, 1981). The elastic wave equation can be solved in two dimensions for point sources in cylindrical coordinates or line sources in rectangular coordinates. Compressional and shear velocity and density are allowed to vary both vertically and radially. Since the code is very computationally intensive for realistic size models, it has been implemented on two Class VI super computers: the Cyber 205 at Purdue University and the Cray XMP-l2 at the Naval Research Laboratory. This technical report is a user's manual for running the code on these machines. It is assumed that the reader is already familiar with running the code on the VAX ll-780 (Hunt et al., 1983).
    Description: Funding was provided by the National Science Foundation under grant Nos. OCE-811 7571 and OCE-8409155; and by the Office of Naval Research under contract No. N00014-85-C-001NR.
    Keywords: Computer programs ; Seismograms
    Repository Name: Woods Hole Open Access Server
    Type: Working Paper
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  • 5
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    Bathymetry and sediment thickness survey of the Hawaii-2 cable : cruise report for Kiwi expedition leg 2 on the R/V Roger Revelle (2011)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: The primary purpose of this cruise was to identify at least two potential observatory sites along the Hawaii-2 cable that would be suitable for drilling a hole to basement. There is a funded program, the Hawaii-2 Observatory (H20), to install a junction box on the cable about mid-way between California and Hawaii (Figures 1 and 2). We want to identify sites in advance so that drilling will be possible near the observatory. This will permit a large range of borehole experiments to be cared out continuously and in real time. Based on available data we chose a section of cable between 140° and 143°W. This cable lies on a ribbon of 'normal' oceanic crust with well defined magnetic anomalies and relatively smooth bathymetry. The goals were to acquire SEABEAM bathymetry data and single channel seismic reflection data along this section of cable, to identify at least two potential sites along the cable and to car out SCS surveys within about 10km radius of the sites. Since the H20 cable has been given to the scientific community it is a valuable resource for research. While transiting to and from the site we felt that it would be wortwhile to acquire SEABEAM data along as much of the cable track as possible. This 'spec' data, Seabeam and magnetometer data between 130°W and 155°W may be useful to other investigators in the future.
    Description: This work was carried out under the JOI Prime Contract OCE-93020477, JOI Budget Code 44505-J130l0.
    Repository Name: Woods Hole Open Access Server
    Type: Working Paper
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  • 6
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    A sea floor winch system for wire line re-entry of deep sea boreholes (2016)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: The following report describes the scientific motivations for the use of a Sea Floor Winch System for Wireline Re-entry of Deep Sea Boreholes and presents a conceptual design for the winch system.
    Description: This report has been prepared for the Scripps Institution of Oceanography under U.C.S.D. Order # G29733-0901.
    Keywords: Oceanographic instruments ; Winches
    Repository Name: Woods Hole Open Access Server
    Type: Working Paper
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  • 7
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    FINDIF : a software package to create synthetic seismograms by finite differences (2009)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: In order to study seismic wave propagation through laterally varying sea floor structures, a software package has been created to generate synthetic seismograms by finite differences. The elastic wave equation can be solved in two dimensions either for point sources in cylindrical coordinates or for line sources in rectangular coordinates. Vertical and radial variations of the elastic parameters are allowed. The package includes four programs. Input to the system consists of a short file containing parameter values to describe the model. The first program is used to initialize the system for the particular model being used. The source arrays and velocity matrices are each computed by a separate program. The final program, which actually carries out the finite difference calculations, includes six subroutines to implement different options based on alternative finite difference formulations. Two different kinds of output files are created by this program: one or more snap-shot files, and one time series file, which will usually include more than one series.
    Description: Funding was provided by the Office of Naval Research under Contract N00014-79-C-0071; NR 083-004.
    Keywords: Information storage and retrieval systems ; Seismograms ; Acoustic models ; Computer programs
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 8
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    User's guide for FINDIF at SACLANTCEN (2009)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: FINDIF solves the elastic wave equation for a line source in two dimensions by the finite difference method (Virieux,1986; Stephen,1988b). The solution is carried out in the time domain for either pulse or CW sources. Arbitrary distributions of compressional velocity, shear velocity and density (including fluids and solids) can be defined on the finite difference grid. All compressional waves, shear waves, interface waves and evanescent waves are included as are all conversions between wave types. Multiple forward and backward scattering is automatically treated
    Description: This work was cared out under ONR Contract #N00014-89-J-1012 and under ONR Grant #NOOOI490J1541
    Repository Name: Woods Hole Open Access Server
    Type: Working Paper
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  • 9
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    SeisCORK meeting report (2015)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: SeisCORK meeting, November 15 and 16, 2004, Stress/Mohr Engineering, Houston, Texas 77041-1205
    Description: The purpose of this meeting was to explore design options to simultaneously acquire borehole seismic data and hydro-geological data (pressure, temperature, fluid sampling and microbiological sampling) on a single CORK system. The scientific focus was to add a seismic component to the Juan de Fuca Hydrogeology program. By permanently installing a sensor string in the borehole our goal was to enable: l) time-lapse VSP's and offset VSP's with sufficient data quality to study amplitude versus offset, shear wave anisotropy, and lateral heterogeneity; 2) monitoring of micro- and nano- earthquake activity around the site for correlation with pressure transients. Because of the difficulty in ensuring adequate coupling through multiple casing strings we concluded that it was impractical to install the vertical seismic array with 10m spacing (50-60 nodes) that would be necessary for VSP's and time-lapse VSP's. We did describe a scenario for a vertical seismic array with approximately 100m spacing (5-6 nodes) that could be used for offset-VSP's and seismic monitoring. This uses some unique technology and involves two seismic strings: one in the annulus between the 4- 1/2" and 10-3/4" casings and one in the middle of the 4-1/2" casing.
    Description: Funding was provided by the National Science Foundation under Grant No. OCE-0450318.
    Repository Name: Woods Hole Open Access Server
    Type: Working Paper
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  • 10
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    Seafloor borehole array seismic system (SEABASS) (2016)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: The Seafloor Borehole Array Seismic System (SEABASS) has been developed to measure the pressure and three dimensional particle velocity of the VLF sound field (2-50HZ) below the seafloor in the deep ocean (water depths of up to 6km). The system consists off our three-component borehole seismometers (with an optional hydrophone), a borehole digitizing unit, and a seafloor control and recording package. The system can be deployed using a wire line re-entry capability from a conventional research vessel in Deep Sea Drilling Project (DSDP) and Ocean Drilling Project (ODP) boreholes. Data from below the seafloor are acquired either on-board the research vessel via coaxial tether or remotely on the seafloor in a self-contained package. If necessary the data module from the seafloor package can be released independently and recovered on the surface. This paper describes the engineering specifications of SEABASS, the tests that were carried out, and preliminary results from an actual deep sea deployment. Ambient noise levels beneath the seafloor acquired on the Low Frequency Acoustic-Seismic Experiment (LFASE) are within 20dB of levels from previous seafloor borehole seismic experiments and from land borehole measurements. The ambient noise observed on LFASE decreases by up to 12dB in the upper 100m of the seafloor in a sedimentary environment.
    Description: This work was carried out under JHU Contract # 602809-0 and under ONR contracts #N00014-89-C-0018, #N00014-89-J-1012, and #N00014-90-C-0098.
    Keywords: Very Low Frequency (VLF) sound fields (2-50 Hz) ; Seafloor Borehole Array Seismic System (SEABASS) ; Deep Sea Drilling Project (DSDP). ; Low Frequency Acoustic-Seismic Experiment (LFASE)
    Repository Name: Woods Hole Open Access Server
    Type: Working Paper
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