March 25, 2020 Dataset Open Access

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

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    <subfield code="a">&lt;p&gt;Seismic velocity model AKEP2020 uses earthquake travel-time and ambient noise group velocity data to update Eberhart-Phillips et al. (2006: AKEP2006)&lt;/p&gt;

&lt;p&gt;&amp;nbsp;&lt;/p&gt;

&lt;p&gt;The model is provided in a table: vlAKEP2020xyzltlnSFDRE.tbl.txt&lt;/p&gt;

&lt;p&gt;and in the simul output from velocity inversion: vlAKEP2020.out.txt&lt;/p&gt;

&lt;p&gt;Map plots of Vp and Vp/Vs are also provided, with lines denoting limits of adequate data.&lt;/p&gt;

&lt;p&gt;&amp;nbsp;&lt;/p&gt;

&lt;p&gt;Velocity Inversion Procedure Notes for AKEP2020 model&lt;/p&gt;

&lt;p&gt;&amp;nbsp;&lt;/p&gt;

&lt;p&gt;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.&amp;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.&lt;/p&gt;

&lt;p&gt;Velocity with the 3D gridded model is defined by linearly interpolating between nodes.&lt;/p&gt;

&lt;p&gt;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.&lt;/p&gt;

&lt;p&gt;&amp;nbsp;&lt;/p&gt;

&lt;p&gt;This material is based upon work supported by the&amp;nbsp;U.S. Geological Survey under Grant No. G19AP00019.&amp;nbsp; Note that an earlier model, AKEP2018, from the first year of this funded project was reported in Eberhart-Phillips et al. (2019).&lt;br&gt;
&lt;br&gt;
The views and conclusions contained in this document&amp;nbsp;are those of the authors and should not be interpreted as representing the&amp;nbsp;opinions or policies of the U.S. Geological Survey.&amp;nbsp;Mention of trade names or&amp;nbsp;commercial products does not constitute their endorsement by the U.S.&amp;nbsp;Geological Survey&lt;/p&gt;</subfield>
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