{
    "tag": 18950,
    "title": "Detailed aeromagnetic survey grid of the Trinidad Area, California",
    "pubdate": "20250403",
    "sername": null,
    "series_name": null,
    "issue": "DOI:10.5066\/P13SZBH7",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/pcmsc\/DataReleases\/CMGDS_DR_tool\/DR_P13SZBH7\/Trinidad_RMI_Final_metadata.faq.html",
    "format": null,
    "email": null,
    "descript": "This data release provides access to gridded data from a low-altitude, aeromagnetic survey of a part of northwestern California. The survey extends west of the Klamath Mountains across the Pacific Ocean coastline over the continental shelf and covers the towns of Crescent City, Trinidad, Fortuna, Eureka, Arcata, and McKinleyville. Data were acquired during the summer and fall of 2024 by Xcalibur Multiphysics working under contract to the Yurok Tribe and under supervision of the U.S. Geological Survey. Total magnetic field values were acquired using a fixed-wing aircraft flown at a target elevation of 305 meters (m) above terrain and along flight lines and tie lines spaced 600 m and 6000 m apart, respectively. Flight lines were directed northeast-southwest; tie lines were directed northwest-southeast. A total of 13,134 line-kilometers were acquired.",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "Watt, Janet T.",
            "role": "Author"
        },
        {
            "name": "Langenheim, Victoria E.",
            "role": "Author"
        },
        {
            "name": "Staisch, Lydia M.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "18",
            "name": "aeromagnetic surveying",
            "scope": "Mapping of the earth's magnetic field with the use of airborne electronic magnetometers."
        },
        {
            "thcode": 2,
            "code": "219",
            "name": "crust (earth)",
            "scope": "The outermost layer of the earth which is relatively thin, of lower density than the core, and rocky."
        },
        {
            "thcode": 2,
            "code": "304",
            "name": "earthquakes",
            "scope": "Ground shaking caused by the sudden release of accumulated strain by an abrupt shift of rock along a fracture in the earth or by volcanic or magmatic activity, or other sudden stress changes in the earth."
        },
        {
            "thcode": 2,
            "code": "677",
            "name": "magnetic field (earth)",
            "scope": "The magnetic region surrounding earth.  It is generated by the dipolar characteristic of earth's core whereby earth itself acts as a great spherical magnet with poles near, but not exactly at, the North and South poles."
        },
        {
            "thcode": 2,
            "code": "1669",
            "name": "magnetometer measurement",
            "scope": "Use of specialized instruments designed to measure the earth's magnetic field at a given location."
        },
        {
            "thcode": 2,
            "code": "781",
            "name": "neotectonic processes",
            "scope": "Changes which took place during geological time after the Miocene era and are associated with the structural forces that affect the deformation, uplift, and movement occurring in the earth's crust."
        },
        {
            "thcode": 15,
            "code": "008",
            "name": "geoscientificInformation",
            "scope": "Information pertaining to earth sciences, for example geophysical features and processes, geology, minerals, sciences dealing with the composition, structure and origin of the earth's rocks, risks of earthquakes, volcanic activity, landslides, gravity information, soils, permafrost, hydrogeology, groundwater, erosion"
        },
        {
            "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": "122",
            "name": "continental margin",
            "scope": "the zone of transition between the continents and oceans, including the continental shelf, slope, and rise."
        },
        {
            "thcode": 61,
            "code": "426",
            "name": "magnetic field observations",
            "scope": "measurement of the Earth's magnetic field at a specific location; often used to detect magnetic anomalies that reflect the nature and distribution of subsurface earth materials."
        }
    ],
    "place_term": [],
    "image": [],
    "fan": []
}