Author: Brad T. AagaardPublisher:
ISBN:
Category : Earthquake hazard analysis
Languages : en
Pages : 37
Book Description
Science Plan for Improving Three-dimensional Seismic Velocity Models in the San Francisco Bay Region, 2019-24
Author: Brad T. AagaardPublisher:
ISBN:
Category : Earthquake hazard analysis
Languages : en
Pages : 37
Book Description
Modeling Three-dimensional Wave Propagation in the San Francisco Bay Area
Author: Douglas S. DregerPublisher:
ISBN:
Category : Seismic waves
Languages : en
Pages : 44
Book Description
Three Dimensional Velocity Model of the Los Angeles Region from Active Source Seismic Data
Author: Kimberly Ann SchrammPublisher:
ISBN:
Category : Seismic reflection method
Languages : en
Pages :
Book Description
The Seismic Velocity Model as an Interpretation Asset
Author: Phil SchultzPublisher: SEG Books
ISBN: 1560800917
Category : Science
Languages : en
Pages : 234
Book Description
A 3D velocity model is built with a both geophysical and geologic input because of the accuracy demands of depth imaging, so it becomes an increasingly effective interpretive tool. This book addresses ways in which the interpreter should participate in development of the model and underscores its interpretive value with case study examples.
Estimating the Uncertainty and Predictive Capabilities of Three-Dimensional Earth Models
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 11
Book Description
Many three-dimensional models of seismic velocity structure in Eurasia have been developed in recent years by the seismic nuclear monitoring community. Most of these models are not accompanied by quantitative estimates of uncertainty, either in the model velocities themselves or in geophysical observables predicted by the models (e.g., body-wave travel times). Moreover, the various 3D models produced by these studies have not been compared to one another for their predictive capabilities in any meaningful way. We have recently begun a new effort to address these issues, which will culminate in a comprehensive evaluation of the current generation of 3D seismic velocity models. In this paper we show the results of applying two familiar validation techniques, or model evaluation metrics, to three seismic velocity models. The evaluation metrics are regional travel-time prediction and event relocation, each using a ground-truth (GT) dataset that includes events with epicenters known to 7 km or better and regional P and S arrivals within the footprint of the model region. The models include the Joint Weston/MIT (JWM) crust and upper-mantle velocity model for south-central Asia, which was derived by jointly inverting a large set of body-wave Q travel times and surface-wave group velocities in a coupled nonlinear procedure. We also derived models from the body-wave and surface-wave datasets separately, using the same initial model, inversion grids, constraints and regularization employed in the joint inversion. To make comparisons with the JWM model possible, we applied the Poisson's ratio of the initial model to convert the P velocity model constructed with travel times to an S velocity model (and vice versa). The results of these exercises reveal many factors that complicate the straightforward evaluation of the models.
Geology of the San Francisco Bay Region
Author: Doris SloanPublisher: Univ of California Press
ISBN: 0520241266
Category : Nature
Languages : en
Pages : 353
Book Description
"You can't really know the place where you live until you know the shapes and origins of the land around you. To feel truly at home in the Bay Area, read Doris Sloan's intriguing stories of this region's spectacular, quirky landscapes."—Hal Gilliam, author of Weather of the San Francisco Bay Region "This is a fascinating look at some of the world's most complex and engaging geology. I highly recommend this book to anyone interested in an understanding of the beautiful landscape and dynamic geology of the Bay Area."—Mel Erskine, geological consultant "This accessible summary of San Francisco Bay Area geology is particularly timely. We are living in an age where we must deal with our impact on our environment and the impact of the environment on us. Earthquake hazards, and to a lesser extent landslide hazards, are well known, but the public also needs to be aware of other important engineering and environmental impacts and geologic resources. This book will allow Bay Area residents to make more intelligent decisions about the geological issues affecting their lives."—John Wakabayashi, geological consultant
Modeling Three-dimensional Site Response Effects in the Marina District Basin, San Francisco, California
Author: Robert W. GravesPublisher:
ISBN:
Category : Earthquakes
Languages : en
Pages : 76
Book Description
Crustal Structure and Three Dimensional Ground Motion Modeling in the San Francisco Bay Region
Author: Ralph J. ArchuletaPublisher:
ISBN:
Category : Earth movements
Languages : en
Pages : 22
Book Description
Three-dimensional Seismic Modeling
Author: Luh-Cheng LiangPublisher:
ISBN:
Category : Seismic prospecting
Languages : en
Pages : 207
Book Description
Author: