Aug 19, 2020 · The USGS 3-D Geologic and Seismic Velocity Models of the San Francisco Bay region provide a three-dimensional view of the geologic structure and physical properties of the region down to a depth of 45 km (28 miles).

Dec 9, 2021 · This three-dimensional (3D) seismic velocity model includes a detailed domain covering the greater San Francisco Bay urban region and a regional domain at a coarser resolution covering a larger region.

Mar 20, 2023 · In order to make cities in earthquake-prone regions more resilient, engineers rely on simulation models to help predict the potential effects of seismic activity to buildings and other key pieces of community infrastructure.

This paper represents a first step in developing a Standard Physical Earthquake Model for the San Francisco Bay Area through realistic, 3000-year simulations of earthquakes on all of the area’s major faults.

Jan 1, 2007 · [1] A new three-dimensional P wave velocity model for the greater San Francisco Bay region has been derived using the double-difference seismic tomography method, using data from about 5,500 chemical explosions or air gun blasts and approximately 6,000 earthquakes.

Abstract We reconcile two previously discordant source models of the 1906 San Francisco earthquake and obtain a model that satisfies both triangulation and seismic data by allowing the rupture velocity to exceed the shear-wave velocity.

The Virtual California model includes 650 segments representing the major fault systems in California, including the San Andreas fault responsible for the 1906 San Francisco earthquake. The simulation takes into account the gradual movement …

Oct 17, 2024 · In this study, we investigate the performance of the USGS v21.1 SFBA community velocity model (USGS VM; Aagaard and Hirakawa, 2021) in simulations of ground motions from seven small local earthquakes on the Hayward and Calaveras faults, in the frequency range 0–5 Hz. The moment magnitude of the seven earthquakes ranges from 3.8 to 4.4.

The current version of the USGS Bay Area Velocity Model is a 3D representation of the seismic velocity structure in the San Francisco Bay region. The model has been shown to successfully reproduce many aspects of ground motion and wave propagation from local earthquakes.

This paper represents a first step in developing a Standard Physical Earthquake Model for the San Francisco Bay Area through realistic, 3000-year simulations of earthquakes on all of the area's major faults.