Item talk:Q250497
From geokb
{
"USGS Publications Warehouse": { "@context": "https://schema.org", "@type": "Article", "additionalType": "Journal Article", "name": "Scattered P'P' waves observed at short distances", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "70032547", "url": "https://pubs.usgs.gov/publication/70032547" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70032547 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.1785/0120110157", "url": "https://doi.org/10.1785/0120110157" }, { "@type": "PropertyValue", "propertyID": "ISSN", "value": "00371106" } ], "journal": { "@type": "Periodical", "name": "Bulletin of the Seismological Society of America", "volumeNumber": "101", "issueNumber": "6" }, "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Bulletin of the Seismological Society of America" } ], "datePublished": "2011", "dateModified": "2013-05-09", "abstract": "We detect previously unreported 1 Hz scattered waves at epicentral distances between 30\u00b0 and 50\u00b0 and at times between 2300 and 2450 s after the earthquake origin. These waves likely result from off-azimuth scattering of PKPbc to PKPbc in the upper mantle and crust and provide a new tool for mapping variations in fine-scale (10 km) mantle heterogeneity. Array beams from the Large Aperture Seismic Array (LASA) clearly image the scattered energy gradually emerging from the noise and reaching its peak amplitude about 80 s later, and returning to the noise level after 150 s. Stacks of transverse versus radial slowness (\u03c1t, \u03c1r) show two peaks at about (2, -2) and (-2,-2) s/\u00b0, indicating the waves arrive along the major arc path (180\u00b0 to 360\u00b0) and significantly off azimuth. We propose a mantle and surface PKPbc to PKPbc scattering mechanism for these observations because (1) it agrees with the initiation time and distinctive slowness signature of the scattered waves and (2) it follows a scattering path analogous to previously observed deep-mantle PK\u2022KP scattering (Chang and Cleary, 1981). The observed upper-mantle scattered waves and PK\u2022KP waves fit into a broader set of scattered waves that we call P\u2032\u2022d\u2022P\u2032, which can scatter from any depth, d, in the mantle.", "publisher": { "@type": "Organization", "name": "Seismological Society of America" }, "author": [ { "@type": "Person", "name": "Earle, Paul S. pearle@usgs.gov", "givenName": "Paul S.", "familyName": "Earle", "email": "pearle@usgs.gov", "affiliation": [ { "@type": "Organization", "name": "Geologic Hazards Science Center", "url": "https://www.usgs.gov/centers/geologic-hazards-science-center" } ] }, { "@type": "Person", "name": "Rost, Sebastian", "givenName": "Sebastian", "familyName": "Rost" }, { "@type": "Person", "name": "Shearer, Peter M.", "givenName": "Peter M.", "familyName": "Shearer" }, { "@type": "Person", "name": "Thomas, Christine", "givenName": "Christine", "familyName": "Thomas" } ], "funder": [ { "@type": "Organization", "name": "Rocky Mountain Mapping Center", "url": "https://www.usgs.gov/programs/national-geospatial-program" } ] }, "OpenAlex": { "abstract_inverted_index": { "We": [ 0, 134 ], "detect": [ 1 ], "previously": [ 2, 173 ], "unreported": [ 3 ], "1": [ 4 ], "Hz": [ 5 ], "scattered": [ 6, 71, 162, 185, 196 ], "waves": [ 7, 29, 120, 163, 186, 189, 197 ], "at": [ 8, 17, 107 ], "epicentral": [ 9 ], "dis-": [ 10 ], "tances": [ 11 ], "between": [ 12, 19 ], "30\u00b0": [ 13 ], "and": [ 14, 16, 21, 43, 45, 78, 87, 112, 130, 138, 156, 164, 179, 187 ], "50\u00b0": [ 15 ], "times": [ 18 ], "2300": [ 20 ], "2450": [ 22 ], "s": [ 23, 85 ], "after": [ 24, 93 ], "the": [ 25, 40, 62, 70, 76, 90, 119, 123, 153, 161, 214 ], "earthquake": [ 26 ], "origin.": [ 27 ], "These": [ 28 ], "likely": [ 30 ], "result": [ 31 ], "from": [ 32, 61, 75, 209 ], "off-azimuth": [ 33 ], "scattering": [ 34, 143, 169 ], "of": [ 35, 97, 160, 195 ], "PKPbc": [ 36, 38, 140, 142 ], "to": [ 37, 89, 128, 141, 172 ], "in": [ 39, 53, 213 ], "upper": [ 41 ], "mantle": [ 42, 57, 137 ], "crust": [ 44 ], "provide": [ 46 ], "a": [ 47, 136, 168, 192 ], "new": [ 48 ], "tool": [ 49 ], "for": [ 50, 145 ], "mapping": [ 51 ], "variations": [ 52 ], "fine-scale": [ 54 ], "(10": [ 55 ], "km)": [ 56 ], "heterogeneity.": [ 58 ], "Array": [ 59, 66 ], "beams": [ 60 ], "Large": [ 63 ], "Aperture": [ 64 ], "Seismic": [ 65 ], "(LASA)": [ 67 ], "clearly": [ 68 ], "image": [ 69 ], "energy": [ 72 ], "gradually": [ 73 ], "emerging": [ 74 ], "noise": [ 77, 91 ], "reaching": [ 79 ], "its": [ 80 ], "peak": [ 81 ], "amplitude": [ 82 ], "about": [ 83, 108 ], "80": [ 84 ], "later,": [ 86 ], "returning": [ 88 ], "level": [ 92 ], "150": [ 94 ], "s.": [ 95 ], "Stacks": [ 96 ], "transverse": [ 98 ], "versus": [ 99 ], "radial": [ 100 ], "slowness": [ 101, 158 ], "(\u03c1t,": [ 102 ], "\u03c1r)": [ 103 ], "show": [ 104 ], "two": [ 105 ], "peaks": [ 106 ], "(2,": [ 109 ], "\ufffd": [ 110, 115 ], "2)": [ 111 ], "\ufffd\ufffd": [ 113 ], "2;": [ 114 ], "2\ufffd": [ 116 ], "s=\u00b0,": [ 117 ], "indicating": [ 118 ], "arrive": [ 121 ], "along": [ 122 ], "major": [ 124 ], "arc": [ 125 ], "path": [ 126, 170 ], "(180\u00b0": [ 127 ], "360\u00b0)": [ 129 ], "significantly": [ 131 ], "off": [ 132 ], "azimuth.": [ 133 ], "propose": [ 135 ], "surface": [ 139 ], "mechanism": [ 144 ], "these": [ 146 ], "observations": [ 147 ], "because": [ 148 ], "(1)": [ 149 ], "it": [ 150, 166 ], "agrees": [ 151 ], "with": [ 152 ], "initiation": [ 154 ], "time": [ 155 ], "distinctive": [ 157 ], "signature": [ 159 ], "(2)": [ 165 ], "follows": [ 167 ], "analogous": [ 171 ], "observed": [ 174, 183 ], "deep-mantle": [ 175 ], "PKKPscat-": [ 176 ], "tering": [ 177 ], "(Chang": [ 178 ], "Cleary,": [ 180 ], "1981).": [ 181 ], "The": [ 182 ], "upper-mantle": [ 184 ], "PKKP": [ 188 ], "fit": [ 190 ], "into": [ 191 ], "broader": [ 193 ], "set": [ 194 ], "that": [ 198 ], "we": [ 199 ], "call": [ 200 ], "P": [ 201 ], "0": [ 202, 204 ], "\u007fdP": [ 203 ], ",": [ 205 ], "which": [ 206 ], "can": [ 207 ], "scatter": [ 208 ], "any": [ 210 ], "depth,": [ 211 ], "d,": [ 212 ], "mantle.": [ 215 ] }, "apc_list": null, "apc_paid": null, "authorships": [ { "author_position": "first", "author": { "id": "https://openalex.org/A5074884713", "display_name": "Paul S. 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