{
    "tag": 13248,
    "title": "USGS Seafloor Mapping CORLISS 98014 Seismic Data",
    "pubdate": "1998",
    "sername": null,
    "series_name": null,
    "issue": "1999-307",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/whcmsc\/open_file_report\/ofr1999-307\/ofr1999-307_segy.faq.html",
    "format": null,
    "email": null,
    "descript": "This CD-ROM contains digital high resolution seismic-reflection and bathymetric data collected during the USGS CORLISS 98014 cruise during Aug. 25 to Sept. 15, 1998.\u00a0 The study area covers the Columbia River estuary, Willapa Bay, and the inner shelf off southern Washington.\u00a0 The seismic-reflection data are stored as SEG-Y standard format that can be read and manipulated by most seismic processing software.\u00a0 Much of the information specific to the data are contained in the headers of the SEG-Y format files.\u00a0 The file system format is ISO 9660 Romeo which can be read with Windows 95\/98, Windows NT, Unix, and Macintosh operating systems with the appropriate CD-ROM driver software installed.\u00a0 The navigation and bathymetric data are stored as an ASCII file with the navigation and depth information logged mostly at a 10 second interval. \u00a0 Blatantly bad bathymetric values were replaced with a value of 9999.\u00a0 Depths are presented in meters from the sea surface (assuming a speed of sound in water of 1450 m\/sec).\u00a0 Both raw and tidally corrected depths are present in the navigation file.",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "Twichell, David C.",
            "role": "Author"
        },
        {
            "name": "Cross, VeeAnn A.",
            "role": "Author"
        },
        {
            "name": "Parolski, Kenneth F.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "707",
            "name": "marine geophysics",
            "scope": "Branch of earth sciences concerned with the physical processes of the oceans and continental margins.  We include here studies of large bodies of brackish and fresh water, such as lakes and rivers."
        },
        {
            "thcode": 2,
            "code": "1045",
            "name": "seismic reflection methods",
            "scope": "Geophysical technique to study the subsurface of the earth using sound waves induced by explosives, vibrating devices, or percussive equipment.  The reflections of the sound waves from the boundaries of different rocks are measured."
        },
        {
            "thcode": 2,
            "code": "2054",
            "name": "sub-bottom profiling",
            "scope": "Methods of imaging the structure of sediments below the sea floor  or lakebed using ship-borne or towed sensors with a variety of sound sources."
        },
        {
            "thcode": 23,
            "code": "3",
            "name": "Distributions",
            "scope": "Locations or patterns of a feature of interest across space and (or) time. These data can include point data, lines, polygons, and temporal data at any scale relevant to CMSP and can be produced by observation, interpolation, or modeling. Distributions can also include maps or statistics of climatology, the environmental values that are expected to be observed at the present time."
        },
        {
            "thcode": 23,
            "code": "23",
            "name": "Substrate",
            "scope": "Represents the character and composition of the surface and near surface of the sea floor in subtidal or intertidal areas, as defined in the Substrate Component of CMECS or in similar classification systems. Distributions are records of substrate characteristics based on visual or photographic inspection or on analysis of samples and cores, and they also include interpretive maps classifying areas on the basis of combinations of observations, hydrodynamic models, or geological models. Assessments include evaluations of present ecological or economic values of substrate distributions, drivers of substrate change, and functions of substrates. Predictions are the results of models or projections of future substrate distributions, values, or ecological impacts, including predicted substrate changes due to natural and human forces including erosion, accretion, sea-level change, extraction, trawling, or other factors; and they are the results of scenario-based models of substrate changes on ecological or economic values under different management strategies or other human alterations."
        },
        {
            "thcode": 61,
            "code": "738",
            "name": "marine geophysics",
            "scope": "used for geophysical and related studies of ocean basins and margins."
        },
        {
            "thcode": 61,
            "code": "479",
            "name": "seismic reflection profiling",
            "scope": "technique for determining the composition and structure of subsurface earth materials based on the transmission and reflection of artificially induced seismic waves; in practice, the seismic waves are generated and received at a one location (in marine geophysical studies, a single ship)."
        }
    ],
    "place_term": [],
    "image": [],
    "fan": [
        "1998-014-FA"
    ]
}