Item talk:Q299924

{

 "USGS Publications Warehouse": {
   "@context": "https://schema.org",
   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "A unified model of crustal stress heterogeneity from borehole breakouts and earthquake focal mechanisms",
   "identifier": [
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse IndexID",
       "value": "70218736",
       "url": "https://pubs.usgs.gov/publication/70218736"
     },
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse Internal ID",
       "value": 70218736
     },
     {
       "@type": "PropertyValue",
       "propertyID": "DOI",
       "value": "10.1029/2020JB020817",
       "url": "https://doi.org/10.1029/2020JB020817"
     }
   ],
   "journal": {
     "@type": "Periodical",
     "name": "JGR Solid Earth",
     "volumeNumber": "126",
     "issueNumber": "2"
   },
   "inLanguage": "en",
   "isPartOf": [
     {
       "@type": "CreativeWorkSeries",
       "name": "JGR Solid Earth"
     }
   ],
   "datePublished": "2021",
   "dateModified": "2021-03-10",
   "abstract": "Observations of crustal stress orientation from the regional inversion of earthquake focal mechanisms often conflict with those from borehole breakouts, possibly indicating local stress heterogeneity, either laterally or with depth. To investigate this heterogeneity, we compiled SHmax estimates from previous studies for 57 near\u2010vertical boreholes with measured breakout azimuths across the Los Angeles region. We identified subsets of earthquake focal mechanisms from established earthquake catalogs centered around each borehole with various criteria for maximum depth and maximum lateral distance from the borehole. Each subset was independently inverted for 3\u2010D stress orientation and corresponding SHmax probability distributions, then compared with the corresponding borehole breakout\u2010derived estimate. We find good agreement when both methods sample the basement stress (breakouts are close to the sediment\u2010basement interface), or when both methods sample the mid\u2010basin stress (sufficient earthquakes are present within a sedimentary basin). Along sedimentary basin margins, in contrast, we find acceptable agreement only when focal mechanisms are limited to shallow and close earthquakes, implying short\u2010length\u2010scale heterogeneity of <20\u00a0km. While the region as a whole shows evidence of both lateral and vertical stress orientation heterogeneity, we find a more homogeneous stress state within basement rock, over length scales of 1\u201335\u00a0km. These results reconcile the apparently conflicting observations of short\u2010length\u2010scale heterogeneity observed in boreholes, which sample primarily the basins, with the relative homogeneity of stress inferred from focal mechanisms, which sample primarily the basement, and imply distinct regimes for the appropriate use of each type of stress indicator.",
   "description": "e2020JB020817, 13 p.",
   "publisher": {
     "@type": "Organization",
     "name": "American Geophysical Union"
   },
   "author": [
     {
       "@type": "Person",
       "name": "Luttrell, Karen",
       "givenName": "Karen",
       "familyName": "Luttrell",
       "identifier": {
         "@type": "PropertyValue",
         "propertyID": "ORCID",
         "value": "0000-0003-1405-1207",
         "url": "https://orcid.org/0000-0003-1405-1207"
       },
       "affiliation": [
         {
           "@type": "Organization",
           "name": "Louisiana State University"
         }
       ]
     },
     {
       "@type": "Person",
       "name": "Hardebeck, Jeanne L. jhardebeck@usgs.gov",
       "givenName": "Jeanne L.",
       "familyName": "Hardebeck",
       "email": "jhardebeck@usgs.gov",
       "identifier": {
         "@type": "PropertyValue",
         "propertyID": "ORCID",
         "value": "0000-0002-6737-7780",
         "url": "https://orcid.org/0000-0002-6737-7780"
       },
       "affiliation": [
         {
           "@type": "Organization",
           "name": "Earthquake Hazards Program",
           "url": "https://www.usgs.gov/programs/earthquake-hazards"
         },
         {
           "@type": "Organization",
           "name": "Earthquake Science Center",
           "url": "https://www.usgs.gov/centers/earthquake-science-center"
         }
       ]
     }
   ],
   "funder": [
     {
       "@type": "Organization",
       "name": "Earthquake Science Center",
       "url": "https://www.usgs.gov/centers/earthquake-science-center"
     }
   ]
 }

}