Alaska 2018 update for USGSG18AP00017: Initial Development of Alaska Community Seismic Velocity Models

<p>Seismic velocity model AKEP2018 uses earthquake travel-time and ambient noise group velocity data to update the Alaska 3-D model of Eberhart-Phillips et al. (2006: AK2006), for the USGS project on developing Alaska Community Seismic Velocity Models .&nbsp; This 2018 model will be expanded with additional data in 2019 in the second year of the funded project.</p> <p>Velocity within the 3D gridded model is defined by linearly interpolating between nodes.&nbsp; The inversion solved for Vp and Vp/Vs.&nbsp; The model is provided in a table: vlAKEP2018xyzltlnSFDRE.tbl.txt, with velocity at inversion nodes in cartesian and latitude-longitude coordinates.&nbsp; 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> <p>This material is based upon work supported by the&nbsp;U.S. Geological Survey under Grant No. G18AP00017.&nbsp;<br> <br> The 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>