Item talk:Q260719

{

 "USGS Publications Warehouse": {
   "@context": "https://schema.org",
   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Imaging a crustal low-velocity layer using reflected seismic waves from the 2014 earthquake swarm at Long Valley Caldera, California: The magmatic system roof?",
   "identifier": [
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse IndexID",
       "value": "70251475",
       "url": "https://pubs.usgs.gov/publication/70251475"
     },
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse Internal ID",
       "value": 70251475
     },
     {
       "@type": "PropertyValue",
       "propertyID": "DOI",
       "value": "10.1029/2018GL077260",
       "url": "https://doi.org/10.1029/2018GL077260"
     }
   ],
   "journal": {
     "@type": "Periodical",
     "name": "Geophysical Research Letters",
     "volumeNumber": "45",
     "issueNumber": "8"
   },
   "inLanguage": "en",
   "isPartOf": [
     {
       "@type": "CreativeWorkSeries",
       "name": "Geophysical Research Letters"
     }
   ],
   "datePublished": "2018",
   "dateModified": "2024-02-13",
   "abstract": "The waveforms generated by the 2014 Long Valley Caldera earthquake swarm recorded at station MLH show clear reflected waves that are often stronger than direct\u00a0P\u00a0and\u00a0S\u00a0waves. With waveform analyses, we discover that these waves are reflected at the top of a low-velocity body, which may be residual magma from the \u223c767\u00a0ka caldera-forming eruption. The polarity of the reflection compared to direct\u00a0P\u00a0and\u00a0S\u00a0waves suggests that the reflection is\u00a0SP\u00a0waves (S\u00a0from hypocenters to reflector and then convert to\u00a0P\u00a0waves to the surface). Because the wavefields are coherent among different earthquakes and hold high signal-to-noise ratios, we apply them to a wavefield migration method for imaging reflectors. The depth of the imaged magmatic system roof is around 8.2\u00a0km below the surface. This is consistent with previous studies. Even though we use only one station and waveforms from one earthquake swarm, the dense cluster of accurately located earthquakes provides a high-resolution image of the roof.",
   "description": "8 p.",
   "publisher": {
     "@type": "Organization",
     "name": "American Geophysical Union"
   },
   "author": [
     {
       "@type": "Person",
       "name": "Nakata, Nori",
       "givenName": "Nori",
       "familyName": "Nakata",
       "affiliation": [
         {
           "@type": "Organization",
           "name": "Massachusetts Institute of Technology"
         }
       ]
     },
     {
       "@type": "Person",
       "name": "Shelly, David R.",
       "givenName": "David R.",
       "familyName": "Shelly",
       "identifier": {
         "@type": "PropertyValue",
         "propertyID": "ORCID",
         "value": "0000-0003-2783-5158",
         "url": "https://orcid.org/0000-0003-2783-5158"
       },
       "affiliation": [
         {
           "@type": "Organization",
           "name": "Geologic Hazards Science Center",
           "url": "https://www.usgs.gov/centers/geologic-hazards-science-center"
         },
         {
           "@type": "Organization",
           "name": "Volcano Science Center",
           "url": "https://www.usgs.gov/centers/volcano-science-center"
         }
       ]
     }
   ],
   "funder": [
     {
       "@type": "Organization",
       "name": "Geologic Hazards Science Center",
       "url": "https://www.usgs.gov/centers/geologic-hazards-science-center"
     },
     {
       "@type": "Organization",
       "name": "Volcano Science Center",
       "url": "https://www.usgs.gov/centers/volcano-science-center"
     }
   ],
   "spatialCoverage": [
     {
       "@type": "Place",
       "additionalType": "country",
       "name": "United States",
       "url": "https://geonames.org/4074035"
     },
     {
       "@type": "Place",
       "additionalType": "state",
       "name": "California"
     },
     {
       "@type": "Place",
       "geo": [
         {
           "@type": "GeoShape",
           "additionalProperty": {
             "@type": "PropertyValue",
             "name": "GeoJSON",
             "value": {
               "type": "FeatureCollection",
               "features": [
                 {
                   "type": "Feature",
                   "properties": {},
                   "geometry": {
                     "coordinates": [
                       [
                         [
                           -118.92371822400433,
                           37.74158666651857
                         ],
                         [
                           -118.92371822400433,
                           37.553410873039084
                         ],
                         [
                           -118.66414058184615,
                           37.553410873039084
                         ],
                         [
                           -118.66414058184615,
                           37.74158666651857
                         ],
                         [
                           -118.92371822400433,
                           37.74158666651857
                         ]
                       ]
                     ],
                     "type": "Polygon"
                   }
                 }
               ]
             }
           }
         },
         {
           "@type": "GeoCoordinates",
           "latitude": 37.64749876977883,
           "longitude": -118.79392940292524
         }
       ]
     }
   ]
 }

}