CVM

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

Timeline

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.

CVM Viewer

The CRESCENT Community Velocity Model (CVM) Viewer is a web-based platform for visualizing and exploring 3D models of seismic wave velocities and densities in the Earth. The viewer contains multiple published models of seismic wave velocities and will in future contain accompanying density models, relevant metadata, and supports filtering models by latitude, longitude, and depth. The viewer also contains interactive tools that allow the user to make model cross sections, depth profiles, and horizontal slices. The viewer displays the 3D spatial extent of the chosen velocity model, 2D surfaces such as subduction zone interface geometries, other regional crustal faults, terrain, geographic information, and seismicity providing spatial context for model analysis. The platform ensures seamless data integration by adhering to netCDF and HDF5 standards, with tools for data extraction, format conversion, and compliance checks. Users can download model data in multiple formats including CSV, geoCSV, netCDF, and HDF5.

The CVM Viewer is an open-source tool. Code is available on the CRESCENT Github.

Please reference using: https://doi.org/10.5281/zenodo.15015094

Community VELOCITY model VIEWER

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

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

MoRE Info

Data

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

Coming soon

Code

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

Coming soon

Docs

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

Coming soon

Pubs

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

Coming soon

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.