Horizontal Deformation Velocity Map, Version 2.0

[Adapted from Horizontal Deformation Velocity Map, Version 2.0 Release Notes] The velocity map, presented in the tables and figures of this report, represents an ongoing effort by the Crustal Deformation Working Group of the Southern California Earthquake Center to produce a unified horizontal velocity field that shows the contemporary interseismic deformation across southern California. Geodetic data include observations made with the Global Positioning System (GPS), Very Long Baseline Interferometry (VLBI), and Electro-optical Distance Measurement (EDM) during the past three decades. Steady motion is assumed for most of the sites, except those few that have experienced significant velocity changes after occurrence of large earthquakes in the region. Such velocity changes, whenever estimated, are documented in this release.