Strong Ground Motion
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Lower Crystal Springs Dam Improvements and Skyline Bridge Replacement Projects
Lower Crystal Springs Dam Improvements and Skyline Bridge Replacement Projects Highlights, Timelines & FAQs In 2018, work was competed on several interconnected efforts by the County of San Mateo and the San Francisco Public Utilities Commission (SFPUC) to make improvements to the Lower Crystal Springs Dam and replaced the bridge on top of the dam, which allows the re-opening of Skyline Boulevard. Below are some key facts: Lower Crystal Springs Dam Improvement Highlights (SFPUC Project): • Doubling the width of the spillway to 200 feet • Raising the parapet wall on top of the dam by 9 feet • Replacing the stilling basin (which stills released water before it enters San Mateo Creek) with a new larger basin and erosion protection at the toe of the dam • $35 million total project cost, over two years (completed December 2012) Skyline Bridge Replacement Highlights (County of San Mateo project): • The new bridge is 626 feet long and 51.5 feet wide and approximately 7 feet higher than the former bridge. • Constructing retaining walls at the Scenic Vista Point parking area due to the change in bridge elevation. • Created a new 15-foot wide recreational trail on the west side of the bridge that is separated from vehicular traffic and providing connectivity for Crystal Springs Regional Trail users. • Installed new split rail fencing. • A new trail section south of the bridge allows trail users to continue along the Crystal Springs Regional Trail to the relatively new “South of Dam” trail section. • PG&E relocated overhead 230kV electrical transmission lines to the underside of the new bridge. -
New Empirical Relationships Among Magnitude, Rupture Length, Rupture Width, Rupture Area, and Surface Displacement
Bulletin of the Seismological Society of America, Vol. 84, No. 4, pp. 974-1002, August 1994 New Empirical Relationships among Magnitude, Rupture Length, Rupture Width, Rupture Area, and Surface Displacement by Donald L. Wells and Kevin J. Coppersmith Abstract Source parameters for historical earthquakes worldwide are com piled to develop a series of empirical relationships among moment magnitude (M), surface rupture length, subsurface rupture length, downdip rupture width, rupture area, and maximum and average displacement per event. The resulting data base is a significant update of previous compilations and includes the ad ditional source parameters of seismic moment, moment magnitude, subsurface rupture length, downdip rupture width, and average surface displacement. Each source parameter is classified as reliable or unreliable, based on our evaluation of the accuracy of individual values. Only the reliable source parameters are used in the final analyses. In comparing source parameters, we note the fol lowing trends: (1) Generally, the length of rupture at the surface is equal to 75% of the subsurface rupture length; however, the ratio of surface rupture length to subsurface rupture length increases with magnitude; (2) the average surface dis placement per event is about one-half the maximum surface displacement per event; and (3) the average subsurface displacement on the fault plane is less than the maximum surface displacement but more than the average surface dis placement. Thus, for most earthquakes in this data base, slip on the fault plane at seismogenic depths is manifested by similar displacements at the surface. Log-linear regressions between earthquake magnitude and surface rupture length, subsurface rupture length, and rupture area are especially well correlated, show ing standard deviations of 0.25 to 0.35 magnitude units. -
Bioassessment and Water Quality Monitoring in the San Mateo Creek Watershed San Mateo County, California
Bioassessment and Water Quality Monitoring in the San Mateo Creek Watershed San Mateo County, California San Mateo Countywide Stormwater Pollution Prevention Program August 2005 This Page Intentionally Left Blank Bioassessment and Water Quality Monitoring in the San Mateo Creek Watershed San Mateo County, California San Mateo Countywide Stormwater Pollution Prevention Program Prepared for the San Mateo Countywide Stormwater Pollution Prevention Program by EOA, Inc. 1410 Jackson St. Oakland, CA 94612 August 2005 This Page Intentionally Left Blank TABLE OF CONTENTS SUMMARY..................................................................................................................................... i 1.0 INTRODUCTION ....................................................................................................................1 2.0 BACKGROUND ......................................................................................................................1 2.1 Description of Study Area ...................................................................................................1 2.2 Regulatory Information........................................................................................................1 2.3 Previous Water Quality Investigations ................................................................................2 3.0 METHODS ..............................................................................................................................2 3.1 Bioassessment....................................................................................................................2 -
The Third Crossing
The Third Crossing A Megaproject in a Megaregion www.thirdcrossing.org Final Report, February 2017 Transportation Planning Studio Department of City and Regional Planning, University of California, Berkeley Acknowledgements The authors would like to acknowledge the Department of City and Regional Planning (DCRP) at the College of Environmental Design (CED) at UC Berkeley, the University of California Transportation Center and Institute of Transportation Studies (ITS), UC Berkeley for support. A special thanks also goes to the helpful feedback from studio instructor Karen Trapenberg Frick and UC Berkeley faculty and researchers including Jesus Barajas and Jason Corburn. We also acknowledge the tremendous support and insights from colleagues at numerous public agencies and non-profit organizations throughout California. A very special thanks goes to David Ory, Michael Reilly, and Fletcher Foti of MTC for their gracious support in running regional travel and land use models, and to Professor Paul Waddell and Sam Blanchard of UrbanSim, Inc. for lending their resources and expertise in land use modeling. We also thank our classmates Joseph Poirier and Lee Reis; as well as David Eifler, Teresa Caldeira, Jennifer Wolch, Robert Cervero, Elizabeth Deakin, Malla Hadley, Leslie Huang and other colleagues at CED; and, Alexandre Bayen, Laura Melendy and Jeanne Marie Acceturo of ITS Berkeley. About Us We are a team of 15 graduate students in City Planning, Transportation Engineering, and Public Health. This project aims to facilitate a conversation about the future of transportation between the East Bay and San Francisco and in the larger Northern California megaregion. We are part of the Department of City and Regional Planning in the UC Berkeley College of Environmental Design, with support from the University of California Transportation Center and The Institute of Transportation Studies at the University of California, Berkeley. -
Sediment Transport in the San Francisco Bay Coastal System: an Overview
Marine Geology 345 (2013) 3–17 Contents lists available at ScienceDirect Marine Geology journal homepage: www.elsevier.com/locate/margeo Sediment transport in the San Francisco Bay Coastal System: An overview Patrick L. Barnard a,⁎, David H. Schoellhamer b,c, Bruce E. Jaffe a, Lester J. McKee d a U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA, USA b U.S. Geological Survey, California Water Science Center, Sacramento, CA, USA c University of California, Davis, USA d San Francisco Estuary Institute, Richmond, CA, USA article info abstract Article history: The papers in this special issue feature state-of-the-art approaches to understanding the physical processes Received 29 March 2012 related to sediment transport and geomorphology of complex coastal–estuarine systems. Here we focus on Received in revised form 9 April 2013 the San Francisco Bay Coastal System, extending from the lower San Joaquin–Sacramento Delta, through the Accepted 13 April 2013 Bay, and along the adjacent outer Pacific Coast. San Francisco Bay is an urbanized estuary that is impacted by Available online 20 April 2013 numerous anthropogenic activities common to many large estuaries, including a mining legacy, channel dredging, aggregate mining, reservoirs, freshwater diversion, watershed modifications, urban run-off, ship traffic, exotic Keywords: sediment transport species introductions, land reclamation, and wetland restoration. The Golden Gate strait is the sole inlet 9 3 estuaries connecting the Bay to the Pacific Ocean, and serves as the conduit for a tidal flow of ~8 × 10 m /day, in addition circulation to the transport of mud, sand, biogenic material, nutrients, and pollutants. -
1180 Main Street Project, Cultural Resources Inventory and Evaluation Report, Redwood City, San Mateo County, California
1180 Main Street Project, Cultural Resources Inventory and Evaluation Report, Redwood City, San Mateo County, California Prepared for: Premia Capital, LLC 801 Hamilton Street Redwood City, CA Prepared by: Stantec Consulting Services, Inc. January 18, 2019 1180 MAIN STREET PROJECT, CULTURAL RESOURCES INVENTORY AND EVALUATION REPORT, REDWOOD CITY, SAN MATEO COUNTY, CALIFORNIA This document entitled 1180 Main Street Project, Cultural Resources Inventory and Evaluation Report, Redwood City, San Mateo County, California was prepared by Stantec Inc. (“Stantec”) for the account of Premia Capital, LLC (the “Client”). Any reliance on this document by any third party is strictly prohibited. The material in it reflects Stantec’s professional judgment in light of the scope, schedule and other limitations stated in the document and in the contract between Stantec and the Client. The opinions in the document are based on conditions and information existing at the time the document was published and do not take into account any subsequent changes. In preparing the document, Stantec did not verify information supplied to it by others. Any use which a third party makes of this document is the responsibility of such third party. Such third party agrees that Stantec shall not be responsible for costs or damages of any kind, if any, suffered by it or any other third party as a result of decisions made or actions taken based on this document. Prepared by (signature) Joanne Grant, Archaeologist, MA, RPA Reviewed by (signature) John A. Nadolski, M.A. Approved -
Seismic Site Effects in a Deep Alluvial Basin : Numerical Analysis by the Boundary Element Method
SEISMIC SITE EFFECTS IN A DEEP ALLUVIAL BASIN : NUMERICAL ANALYSIS BY THE BOUNDARY ELEMENT METHOD J.F.Semblat1, A.M. Duval2, P. Dangla3 Abstract : The main purpose of the paper is the numerical analysis of seismic site effects in Caracas (Venezuela). The analysis is performed considering the Boundary Element Method in the frequency domain. A numerical model including a part of the local topography is considered, it involves a deep alluvial deposit on an elastic bedrock. The amplification of seismic motion (SH-waves, weak motion) is analyzed in terms of level, occuring frequency and location. In this specific site of Caracas, the amplification factor is found to reach a maximum value of 25. Site effects occur in the thickest part of the basin for low frequencies (below 1.0 Hz) and in two intermediate thinner areas for frequencies above 1.0 Hz. The influence of both incidence and shear wave velocities is also investigated. A comparison with microtremor recordings is presented afterwards. The results of both numerical and experimental approaches are in good agreement in terms of fundamental frequencies in the deepest part of the basin. The boundary element method appears to be a reliable and efficient approach for the analysis of seismic site effects. 1. SOME DIFFERENT ASPECTS OF EARTHQUAKE GEOTECHNICAL ENGINEERING Different types of analysis can be performed to investigate earthquake engineering problems. Depending on the purpose of the analysis, one can stress on the only structural aspect of the problem, the geotechnical point of view -
Evaluating the International Search and Rescue Response to Earthquake Disasters
Original research BMJ Glob Health: first published as 10.1136/bmjgh-2020-002398 on 16 December 2020. Downloaded from Search without rescue? Evaluating the international search and rescue response to earthquake disasters 1 2,3 Anna Rom , Ilan Kelman To cite: Rom A, Kelman I. ABSTRACT Key questions Search without rescue? Earthquakes around the world are unnecessarily lethal Evaluating the international and destructive, adversely affecting the health and well- search and rescue response What is already known? being of affected populations. Most immediate deaths and to earthquake disasters. ► The most common cause of earthquake- related injuries are caused by building collapse, making search BMJ Global Health casualties is building collapse, making early search and rescue (SAR) an early priority. In this review, we 2020;5:e002398. doi:10.1136/ and rescue a priority. bmjgh-2020-002398 assess the SAR response to earthquake disasters. First, ► There is often a lot of media and public interest in we review the evidence for the majority of individuals international search and rescue operations following being rescued locally, often by relatives and neighbours. Handling editor Eduardo earthquake disasters. Gómez We then summarise evidence for successful live rescues ► The majority of search and rescue is carried out lo- by international SAR (ISAR) teams, along with the costs, ► Additional material is cally in the immediate aftermath of earthquakes. published online only. To view ethics and other considerations of deployment. Finally, we please visit the journal online propose an alternative approach to postdisaster ISAR, with What are the new findings? (http:// dx. doi. org/ 10. 1136/ the goal of reducing overall morbidity and mortality. -
Podcast Show Notes & Transcript
SHOW NOTES & TRANSCRIPT EPISODE SHOW NOTES Episode Title: Crystal Springs Dam Episode # & Date: Episode #24 – April 9, 2020 About this Episode: Peter uncovers the history of San Mateo’s great drinking water and the impressive Crystal Springs Dam that makes it possible. Episode Web Page: https://sanmateofocus.com/crystal-springs-dam/ EPISODE TRANSCRIPT This is San Mateo Focus, I’m Peter Radsliff filling in this week for Judy Gordon. When choosing what to present for this episode, it wasn’t lost on Judy and I how surreal life is right now and whether talking about local topics even made a difference in a San Mateo that is locked- down. But maybe because of this lack of normalcy, it’s all the more important to ensure we have some semblance of routine in our lives. It’s with that in mind that we offer ongoing stories of San Mateo’s history, culture, food, and things to do. Onto this week’s episode. When San Mateans hear the words Hetch Hetchy, most know it’s the name of a valley in Yosemite National Park about a four-hour drive away. Some might also know it’s the site of the impressive 431- foot tall O’Shaughnessy Dam that forms the Hetch Hetchy reservoir, which feeds the 160-mile long journey to Upper Crystal Springs Reservoir for us San Mateans to drink. What most probably don’t know is that the Lower Crystal Springs reservoir first existed because of the 141-foot tall Crystal Springs Dam that was built over San Mateo Creek in 1888, a full 35 years before O’Shaughnessy Dam opened in Hetch Hetchy! In this episode we’re going to explore the history of the Crystal Springs Dam and how vital it is to the lifestyle, economy, and safety of San Mateo. -
Washington State Seismic Mitigation Policy Gap Analysis
Washington State Seismic Mitigation Policy Gap Analysis A Cross‐State Comparison Scott B. Miles, Ph.D. Brian D. Gouran, L.G. October, 2010 Prepared for Washington State Division of Emergency Management Resilience Institute Working Paper 2010_2 1 Washington State Gap Analysis; S. Miles & B. Gouran Resilience Institute Working Paper 2010_2 October, 2010 This document was prepared under an award from FEMA, Department of Homeland Security. Points of view or opinions expressed in this document are those of the authors and do not necessarily represent the official position or policies of FEMA or the US Department of Homeland Security. Washington State Gap Analysis; S. Miles & B. Gouran Resilience Institute Working Paper 2010_2 October, 2010 EXECUTIVE SUMMARY The purpose of this study is to understand how Washington State compares with other states with respect to state‐level seismic mitigation policies. This facilitates the identification of potential Washington State policy gaps that might be filled with policies similar to those of other states. This study was accomplished by compiling, synthesizing, and analyzing state‐level policies listed in the mitigation plan of 47 states (3 could not be obtained by the completion of the study). A catalog of describing each of the compiled policies – legislation or executive orders – was assembled. A spreadsheet database was created in order to synthesize, search, and analyze the policies. Quantitative analysis was conducted using a cross‐state analysis and two different computed indicators based on seismic risk and policy count. The cross‐state analysis facilitate a broad assessment of Washington State’s policy coverage given its seismic risk, as well as identification of policies from states with more seismic mitigation policies that Washington State. -
Diocese of San Jose 2020 Directory
Diocese of San Jose 2020 Directory 1150 North First Street, Suite 100 San Jose, California 95112 Phone (408) 983-0100 www.dsj.org updated 10/8/2020 1 2 Table of Contents Diocese Page 5 Chancery Office Page 15 Deaneries Page 29 Churches Page 43 Schools Page 163 Clergy & Religious Page 169 Organizations Page 205 Appendix 1 Page A-1 Appendix 2 Page A-15 3 4 Pope Francis Bishop of Rome Jorge Mario Bergoglio was born in Buenos Aires, Argentina's capital city, on December 17, 1936. He studied and received a master's degree in chemistry at the University of Buenos Aires, but later decided to become a Jesuit priest and studied at the Jesuit seminary of Villa Devoto. He studied liberal arts in Santiago, Chile, and in 1960 earned a degree in philosophy from the Catholic University of Buenos Aires. Between 1964 and 1965 he was a teacher of literature and psychology at Inmaculada High School in the province of Santa Fe, and in 1966 he taught the same courses at the prestigious Colegio del Salvador in Buenos Aires. In 1967, he returned to his theological studies and was ordained a priest on December 13, 1969. After his perpetual profession as a Jesuit in 1973, he became master of novices at the Seminary of Villa Barilari in San Miguel. Later that same year, he was elected superior of the Jesuit province of Argentina and Uruguay. In 1980, he returned to San Miguel as a teacher at the Jesuit school, a job rarely taken by a former provincial superior. -
Determination of Local Magnitude, Ml, from Strong- Motion Accelerograms
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Caltech Authors - Main Bulletin of the Seismological Society of America, Vol. 68, No. 2, pp. 471-485, April, 1978 DETERMINATION OF LOCAL MAGNITUDE, ML, FROM STRONG- MOTION ACCELEROGRAMS BY HIROO KANAMORI AND PAUL C. JENNINGS ABSTRACT A technique is presented for determination of local magnitude, ML, from strong-motion accelerograms. The accelerograph records are used as an accel- eration input to the equation of motion of the Wood-Anderson torsion seismo- graph to produce a synthetic seismogram which is then read in the standard manner. When applied to 14 records from the San Fernando earthquake, the resulting ML is 6.35, with a standard deviation of 0.26. This is in good agreement with the previously reported value of 6.3. The technique is also applied to other earthquakes in the western United States for which strong-motion records are available. An average value of M, -- 7.2 is obtained for the 1952 Kern County earthquake; this number is significantly smaller than the commonly used value of 7.7, which is more nearly a surface-wave magnitude. The method presented broadens the base from which ML can be found and allows ML to be determined in large earthquakes for which no standard assess- ment of local magnitude is possible. In addition, in instances where a large number of accelerograms are available, reliable values of ML can be determined by averaging. INTRODUCTION The strong ground motion resulting from a major earthquake is the result of a very complex process, depending on the fault geometry, fault dimensions, and the rupture mechanism.