Item talk:Q55232
From geokb
{
"USGS Publications Warehouse": { "schema": { "@context": "https://schema.org", "@type": "CreativeWork", "additionalType": "USGS Numbered Series", "name": "Distribution of large boulders on the deposit of the West Salt Creek rock avalanche, western Colorado", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "dr1178", "url": "https://pubs.usgs.gov/publication/dr1178" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70246498 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.3133/dr1178", "url": "https://doi.org/10.3133/dr1178" } ], "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Data Report" } ], "datePublished": "2023", "dateModified": "2023-07-19", "abstract": "On May 25, 2014, a 54.5-million cubic meter rock avalanche in the West Salt Creek valley, Mesa County, Colorado, traveled 4.6 kilometers, leaving a deposit that covers about 2.2 square kilometers. To check the particle-size distribution of the deposit for information about the high mobility of the avalanche, we estimated boulder distribution density for the entire deposit by counting 1-meter (m) or larger diameter boulders of sedimentary rock derived from the Green River Formation that are visible in high-resolution imagery collected from the area in July 2014. Basalt boulders were excluded from the count because field observations indicated that they generally stayed intact as the avalanche moved downslope, whereas sedimentary boulders showed evidence of fragmentation during downslope movement. Variable clarity, contrast, and resolution of the imagery precluded mapping smaller boulders. Experimentation with 5-, 10-, and 20-m resolution grids indicated that a 20-m resolution grid showed the spatial pattern of boulder density across the deposit at a scale that allowed statistically meaningful variations to be determined. In addition to counting the boulders in each 20\u00d720-m grid cell, six categories of successively increasing boulder distribution density were created to help visualize variations in the distribution of 1 meter or larger boulders across the avalanche deposit. Analysis indicates that boulder distribution density gradually decreases with increasing distance from the avalanche source.", "description": "Report: iv, 6 p.; Data Release", "publisher": { "@type": "Organization", "name": "U.S. Geological Survey" }, "author": [ { "@type": "Person", "name": "Lewis, Adrian C.", "givenName": "Adrian C.", "familyName": "Lewis", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0002-6598-7366", "url": "https://orcid.org/0000-0002-6598-7366" }, "affiliation": [ { "@type": "Organization", "name": "Geologic Hazards Science Center", "url": "https://www.usgs.gov/centers/geologic-hazards-science-center" } ] }, { "@type": "Person", "name": "Coe, Jeffrey A. jcoe@usgs.gov", "givenName": "Jeffrey A.", "familyName": "Coe", "email": "jcoe@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0002-0842-9608", "url": "https://orcid.org/0000-0002-0842-9608" }, "affiliation": [ { "@type": "Organization", "name": "Geologic Hazards Science Center", "url": "https://www.usgs.gov/centers/geologic-hazards-science-center" }, { "@type": "Organization", "name": "Geology and Geophysics Science Center", "url": "https://www.usgs.gov/centers/gmeg" } ] }, { "@type": "Person", "name": "Baum, Rex L. baum@usgs.gov", "givenName": "Rex L.", "familyName": "Baum", "email": "baum@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0001-5337-1970", "url": "https://orcid.org/0000-0001-5337-1970" }, "affiliation": [ { "@type": "Organization", "name": "Geologic Hazards Science Center", "url": "https://www.usgs.gov/centers/geologic-hazards-science-center" } ] } ], "funder": [ { "@type": "Organization", "name": "Geologic Hazards Science Center", "url": "https://www.usgs.gov/centers/geologic-hazards-science-center" } ], "spatialCoverage": [ { "@type": "Place", "additionalType": "country", "name": "United States", "url": "https://geonames.org/4074035" }, { "@type": "Place", 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