UCVM Users Guide

Unified California Velocity Model (UCVM) is a proposed California state-wide 3D velocity model. One important use of UCVM is in high resolution 3D wave propagation simulations for California. UCVM development is an interdisciplinary research collaboration involving geoscientists and computer scientists. UCVM geoscience research includes identification and assembly of existing California velocity models into a state-wide model and improvements to existing velocity models. UCVM computer science research includes definition of a easy-to-use CVM query interface, integration of regional 3D and geotechnical models, and automated CVM evaluation processing capabilities.

Existing Model Coverage

UCVM is trying to move forward on a statewide seismic velocity model for CA suitable for ground-motion modeling. Current concept is that this model would not be a single model but a seamless combination of models covering various regions of the state. The tricky part of course is the transition from one model to another and the use of background models to fill in the gaps.

As a first step, we want to put together a map of the coverage:

Current detailed seismic velocity models

1. SCEC CVM-4 CVM-S
2. SCEC CVM-H CVM-H
3. USGS Bay Area
4. Carl's Great Valley model

Background tomographic models

1. Cliff's regional northern CA model,
2. Egill's regional southern CA model,
3. Cliff's statewide model

We will post the following Information for each model:

1. the bounding polygon for each models,
2. the depth extent
3. a brief description of the resolution, and
4. the physical properties it includes (i.e., density, Vp, Vs, Qp, Qs).

Related Entries

CVM-H CVM-S Community Velocity Model