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Alaska 2020 update for USGS G19AP00019: Initial Development of Alaska Community Seismic Velocity Models

Eberhart-Phillips, Donna; Nayak, Avinash; Ruppert, Natalia; Thurber, Clifford

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  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.3727244", 
  "title": "Alaska 2020 update for USGS G19AP00019: Initial Development of Alaska Community Seismic Velocity Models", 
  "issued": {
    "date-parts": [
  "abstract": "<p>Seismic velocity model AKEP2020 uses earthquake travel-time and ambient noise group velocity data to update Eberhart-Phillips et al. (2006: AKEP2006)</p>\n\n<p>&nbsp;</p>\n\n<p>The model is provided in a table: vlAKEP2020xyzltlnSFDRE.tbl.txt</p>\n\n<p>and in the simul output from velocity inversion: vlAKEP2020.out.txt</p>\n\n<p>Map plots of Vp and Vp/Vs are also provided, with lines denoting limits of adequate data.</p>\n\n<p>&nbsp;</p>\n\n<p>Velocity Inversion Procedure Notes for AKEP2020 model</p>\n\n<p>&nbsp;</p>\n\n<p>The 2006 AK model and the 2020 updated model both use Transverse Mercator coordinate transformation with central meridian= -150 and counterclockwise rotation of 162.1.&nbsp; Earth-flattening transformation is used for velocity during ray-tracing. The depths are relative to sea-level and station elevations are used. For the group-velocity data, the surface is taken as the 30-km median filtered topography.</p>\n\n<p>Velocity with the 3D gridded model is defined by linearly interpolating between nodes.</p>\n\n<p>A gradational inversion approach was used with earthquake and shot travel-time data, and group velocity observations for periods 6-15 s. The table provides, from the computed resolution matrix, the diagonal resolution element (DRE), and the spread function (SF), for each Vp and Vp/Vs node.</p>\n\n<p>&nbsp;</p>\n\n<p>This material is based upon work supported by the&nbsp;U.S. Geological Survey under Grant No. G19AP00019.&nbsp; Note that an earlier model, AKEP2018, from the first year of this funded project was reported in Eberhart-Phillips et al. (2019).<br>\n<br>\nThe views and conclusions contained in this document&nbsp;are those of the authors and should not be interpreted as representing the&nbsp;opinions or policies of the U.S. Geological Survey.&nbsp;Mention of trade names or&nbsp;commercial products does not constitute their endorsement by the U.S.&nbsp;Geological Survey</p>", 
  "author": [
      "family": "Eberhart-Phillips, Donna"
      "family": "Nayak, Avinash"
      "family": "Ruppert, Natalia"
      "family": "Thurber, Clifford"
  "version": "AKEP2020", 
  "type": "dataset", 
  "id": "3727244"
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