✦ LIBER ✦

Spatial correlation of shear-wave velocity in the San Francisco Bay Area sediments

✍ Scribed by Eric M. Thompson; Laurie G. Baise; Robert E. Kayen

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 409 KB
Volume: 27
Category: Article
ISSN: 0267-7261
DOI: 10.1016/j.soildyn.2006.05.004

No coin nor oath required. For personal study only.

✦ Synopsis

Ground motions recorded within sedimentary basins are variable over short distances. One important cause of the variability is that local soil properties are variable at all scales. Regional hazard maps developed for predicting site effects are generally derived from maps of surficial geology; however, recent studies have shown that mapped geologic units do not correlate well with the average shear-wave velocity of the upper 30 m, V s (30). We model the horizontal variability of near-surface soil shear-wave velocity in the San Francisco Bay Area to estimate values in unsampled locations in order to account for site effects in a continuous manner. Previous geostatistical studies of soil properties have shown horizontal correlations at the scale of meters to tens of meters while the vertical correlations are on the order of centimeters. In this paper we analyze shear-wave velocity data over regional distances and find that surface shear-wave velocity is correlated at horizontal distances up to 4 km based on data from seismic cone penetration tests and the spectral analysis of surface waves. We propose a method to map site effects by using geostatistical methods based on the shear-wave velocity correlation structure within a sedimentary basin. If used in conjunction with densely spaced shear-wave velocity profiles in regions of high seismic risk, geostatistical methods can produce reliable continuous maps of site effects.

📜 SIMILAR VOLUMES

Discrepancies in diagnoses of neuroepith

Discrepancies in diagnoses of neuroepithelial neoplasms : The San Francisco Bay Area Adult Glioma Study

✍ Ken Aldape; Martha L. Simmons; Richard L. Davis; Rei Miike; John Wiencke; Geoffr 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 79 KB 👁 1 views

## Background: Valid and reliable diagnoses of disease are key both to meaningful epidemiologic and clinical investigations and to decision-making about appropriate treatment. one previous study highlighted the lack of precision in diagnosing primary brain tumors in a neuropathology referral practi

The burden of liver cancer in Asians and

The burden of liver cancer in Asians and Pacific Islanders in the Greater San Francisco Bay Area, 1990 through 2004

✍ Ellen T. Chang; Theresa H. M. Keegan; Scarlett L. Gomez; Gem M. Le; Christina A. 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 149 KB 👁 1 views

## Abstract ## BACKGROUND. To the authors' knowledge, no previous U.S. study has examined time trends in the incidence rate of liver cancer in the high‐risk Asian/Pacific Islander population. In this study, liver cancer incidence trends were evaluated in Chinese, Filipino, Japanese, Korean, and Vi

IgE, allergy, and risk of glioma: Update

IgE, allergy, and risk of glioma: Update from the San Francisco Bay Area Adult Glioma Study in the Temozolomide era

✍ Joseph L. Wiemels; David Wilson; Chirag Patil; Joseph Patoka; Lucie McCoy; Terri 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 French ⚖ 125 KB 👁 1 views

## Abstract The consistently observed inverse relationship of allergic conditions with glioma risk and our previous demonstration that immunoglobulin E (IgE) levels also were lower in glioma patients than controls suggest that atopic allergy may be related to a mechanism that inhibits or prevents g

Intake of fatty acids and antioxidants a

Intake of fatty acids and antioxidants and pancreatic cancer in a large population-based case-control study in the San Francisco Bay Area

✍ Zhihong Gong; Elizabeth A. Holly; Furong Wang; June M. Chan; Paige M. Bracci 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 French ⚖ 176 KB 👁 1 views

There are no well-established modifiable risk factors for pancreatic cancer except smoking. Some dietary factors have been associated with pancreatic cancer risk and require further study. We examined the associations among intake of specific fatty acids and antioxidants and risk of pancreatic cance

A large-scale categorization of sites in

A large-scale categorization of sites in San Francisco Bay, USA, based on the sediment quality triad, toxicity identification evaluations, and gradient studies

✍ John W. Hunt; Brian S. Anderson; Bryn M. Phillips; Ron S. Tjeerdema; Karen M. Ta 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 127 KB 👁 2 views

## Abstract Sediment quality was assessed in San Francisco Bay, California, USA, using a two‐tiered approach in which 111 sites were initially screened for sediment toxicity. Sites exhibiting toxicity were then resampled and analyzed for chemical contamination, recurrent toxicity, and, in some case

Political influence in transportation pl

Political influence in transportation planning: The San Francisco Bay Area Metropolitan Transportation Commission's regional transportation plan: James Houston Banks, Departments of Civil Engineering, San Diego State University, San Diego, CA 92182 (Dissertation at The Department of Civil Engineering, University of Califonia, Berkeley, CA 94720).

📂 Article 📅 1977 🏛 Elsevier Science ⚖ 129 KB