Community Velocity Model Working Group

Working Group

Community Velocity Model

The Community Velocity Model (CVM) working group is constructing a three-dimensional representation of subsurface material properties for the Cascadia region.  This includes seismic velocities (how fast seismic waves propagate) and densities (how stiff or consolidated material is). The model synthesizes existing information from the Pacific Northwest, including Northern California, Oregon, Washington, and British Columbia. These properties are critical to estimate the strength and other characteristics of shaking for future earthquakes in the Pacific Northwest, which plays a role in seismic hazard assessments. The CVM is a necessary input for the science of all other CRESCENT working groups and will be used by the broader community.  

US Geological Survey Open-File Report 2017–1152.

Major Activities


Community Product

Community Velocity Model

The CRESCENT CVM will be a three-dimensional, observational-empirical-structural hybrid model, with a large-scale regional base developed from inversions of seismological data, and shallow and geotechnical data embedded using geological constraints with empirical rock property relationships as well as near-surface seismic information. Spanning from Northern California to British Columbia, the various generations of the model will be available for CRESCENT-related science and community users in a variety of formats for common geophysical and modeling tools.

FAIR Science

Data, Code, Documentation, and Publications

CRESCENT is committed to open, reproducible science. The foundations upon which CVM community products are built can be found in the links provided below.

Topical Workshop

Topical Workshop

Get updates on CVM products at our Yr 1 Topical Workshop May 13-14, 2024


Data used to create CVM community products can be found at the link below.


Code used to create CVM community products can be found at the link below.


Documentation of CVM community products can be found at the link below.


Publications relevant to CVM community products can be found at the link below.

Meet The Team

CVM Membership

The CRESCENT CVM team combines expertise in multiscale observational seismology imaging techniques (e.g., ambient noise, teleseismic, and local earthquake data, and onshore/offshore active-source data) with expertise in ground motion modeling and the typical applications and uses of a CVM. We will collaboratively produce a community model that is useful and applicable to a variety of subduction zone science applications including dynamic rupture modeling, structural and geologic interpretation, and ground motion modeling.

Alex grant, US Geological Survey

alex grant
United States Geological Survey

Valerie Sahakian, University of Oregon

Valerie Sahakian

CVM co-lead
University of Oregon

Pieter-Ewald Share, Oregon State University

Pieter-Ewald Share

CVM co-lead
Oregon State University

Emilie Hooft, University of Oregon

Emilie Hooft
University of Oregon

Erin Wirth, US Geological Survey

Erin Wirth
United States Geological Survey

Jonathan Delph, Purdue University

Jonathan Delph
Purdue University

Bin He (Postdoc)
University of Texas at Dallas

Rasheed Ajala
Columbia University

Bill Stephenson
United States Geological Survey

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