Item talk:Q256448

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   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Short-period strain (0.1\u2013105 s): Near-source strain field for an earthquake (ML 3.2) near San Juan Bautista, California",
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       "value": "10.1029/JB091iB11p11497",
       "url": "https://doi.org/10.1029/JB091iB11p11497"
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   "journal": {
     "@type": "Periodical",
     "name": "Journal of Geophysical Research B: Solid Earth",
     "volumeNumber": "91",
     "issueNumber": "B11"
   },
   "inLanguage": "en",
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       "name": "Journal of Geophysical Research B: Solid Earth"
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   "datePublished": "1986",
   "dateModified": "2022-07-28",
   "abstract": "Measurements of dilational earth strain in the frequency band 25\u201310\u22125\u00a0Hz have been made on a deep borehole strainmeter installed near the San Andreas fault. These data are used to determine seismic radiation fields during nuclear explosions, teleseisms, local earthquakes, and ground noise during seismically quiet times. Strains of less than 10\u221210\u00a0on these instruments can be clearly resolved at short periods (< 10 s) and are recorded with wide dynamic range digital recorders. This permits measurement of the static and dynamic strain variations in the near field of local earthquakes. Noise spectra for earth strain referenced to 1 (strain)2/Hz show that strain resolution decreases at about 10 dB per decade of frequency from \u2212150 dB at 10\u22124\u00a0Hz to \u2212223 dB at 10 Hz. Exact expressions are derived to relate the volumetric strain and displacement field for a homogeneous\u00a0P\u00a0wave in a general viscoelastic solid as observed on colocated dilatometers and seismometers. A rare near-field recording of strain and seismic velocity was obtained on May 26, 1984, from an earthquake (ML\u00a03.2) at a hypocentral distance of 3.2 km near the San Andreas fault at San Juan Bautista, California. While the data indicate no precursory strain release at the 5 \u00d7 10\u221211\u00a0strain level, a coseismic strain release of 1.86 nanostrain was observed. This change in strain is consistent with that calculated from a simple dislocation model of the event. Ground displacement spectra, determined from the downhole strain data and instrument-corrected surface seismic data, suggest that source parameters estimated from surface recordings may be contaminated by amplification effects in near-surface low-velocity materials.",
   "description": "6 p.",
   "publisher": {
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     "name": "American Geophysical Union"
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   "author": [
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       "name": "Linde, A. T.",
       "givenName": "A. T.",
       "familyName": "Linde"
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       "@type": "Person",
       "name": "Borcherdt, Roger D. borcherdt@usgs.gov",
       "givenName": "Roger D.",
       "familyName": "Borcherdt",
       "email": "borcherdt@usgs.gov",
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           "@type": "Organization",
           "name": "Earthquake Science Center",
           "url": "https://www.usgs.gov/centers/earthquake-science-center"
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       "name": "Johnston, M.J.S.",
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