Appendix G—Paleoseismic Sites Recurrence Database
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Structure Preliminary Geotechnical Report
I NITIAL S TUDY/MITIGATED N EGATIVE D ECLARATION Y ORBA L INDA B OULEVARD W IDENING I MPROVEMENTS P ROJECT S EPTEMBER 2020 Y ORBA L INDA, C ALIFORNIA APPENDIX F STRUCTURE PRELIMINARY GEOTECHNICAL REPORT P:\HNT1901.02 - Yorba Linda\Draft ISMND\Draft ISMND_Yorba Linda Blvd Widening Improvements Project_9.18.20.docx «09/18/20» Y ORBA L INDA B OULEVARD W IDENING I MPROVEMENTS P ROJECT I NITIAL S TUDY/MITIGATED N EGATIVE D ECLARATION Y ORBA L INDA, C ALIFORNIA S EPTEMBER 2020 This page intentionally left blank P:\HNT1901.02 - Yorba Linda\Draft ISMND\Draft ISMND_Yorba Linda Blvd Widening Improvements Project_9.18.20.docx «09/18/20» Earth Mechanics, Inc. Geotechnical & Earthquake Engineering November 13, 2019 EMI Project No. 19-143 HNTB 200 E. Sandpointe Avenue, Suite 200 Santa Ana, California 92707 Attention: Mr. Patrick Somerville Subject: Structure Preliminary Geotechnical Report Yorba Linda Blvd Bridge over Santa Ana River (Widen), Bridge No. 55C-0509 Yorba Linda Boulevard and Savi Ranch Parkway Widening Project City of Yorba Linda, California Dear Mr. Somerville: Attached is our Structure Preliminary Geotechnical Report (SPGR) for the proposed widening of the Yorba Linda Boulevard Bridge over the Santa Ana River (Bridge No. 55C-0509) in the City of Yorba Linda, California. The bridge widening is part of the Yorba Linda Boulevard and Savi Ranch Parkway Widening Project. This report was prepared to support the Project Approval and Environmental Document (PA-ED) phase of the project. The SPGR includes information required by the 2017 California Department of Transportation (Caltrans) Foundation Reports for Bridges document. -
Introduction San Andreas Fault: an Overview
Introduction This volume is a general geology field guide to the San Andreas Fault in the San Francisco Bay Area. The first section provides a brief overview of the San Andreas Fault in context to regional California geology, the Bay Area, and earthquake history with emphasis of the section of the fault that ruptured in the Great San Francisco Earthquake of 1906. This first section also contains information useful for discussion and making field observations associated with fault- related landforms, landslides and mass-wasting features, and the plant ecology in the study region. The second section contains field trips and recommended hikes on public lands in the Santa Cruz Mountains, along the San Mateo Coast, and at Point Reyes National Seashore. These trips provide access to the San Andreas Fault and associated faults, and to significant rock exposures and landforms in the vicinity. Note that more stops are provided in each of the sections than might be possible to visit in a day. The extra material is intended to provide optional choices to visit in a region with a wealth of natural resources, and to support discussions and provide information about additional field exploration in the Santa Cruz Mountains region. An early version of the guidebook was used in conjunction with the Pacific SEPM 2004 Fall Field Trip. Selected references provide a more technical and exhaustive overview of the fault system and geology in this field area; for instance, see USGS Professional Paper 1550-E (Wells, 2004). San Andreas Fault: An Overview The catastrophe caused by the 1906 earthquake in the San Francisco region started the study of earthquakes and California geology in earnest. -
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. -
2016 Hayward Local Hazard Mitigation Plan
EARTHQUAKE SEA LEVEL RISE FLOOD DROUGHT CLIMATE CHANGE LANDSLIDE HAZARDOUS WILDFIRE TSUNAMI MATERIALS LOCAL HAZARD MITIGATION PLAN 2 016 CITY OF heart of the bay TABLE OF CONTENTS TABLE OF FIGURES ......................................................................................................................... 4 TABLE OF TABLES .......................................................................................................................... 4 EXECUTIVE SUMMARY 5 RISK ASSESSMENT & ASSET EXPOSURE ......................................................................................... 6 EARTHQUAKE ................................................................................................................................. 6 FIRE ............................................................................................................................................... 6 LANDSLIDE ..................................................................................................................................... 6 FLOOD, TSUNAMI, AND SEA LEVEL RISE .......................................................................................... 6 DROUGHT ....................................................................................................................................... 6 HAZARDOUS MATERIALS ................................................................................................................. 7 MITIGATION STRATEGIES ............................................................................................................... -
Geodetic Constraints on San Francisco Bay Area Fault Slip Rates and Potential Seismogenic Asperities on the Partially Creeping Hayward Fault Eileen L
Masthead Logo Smith ScholarWorks Geosciences: Faculty Publications Geosciences 3-2012 Geodetic Constraints on San Francisco Bay Area Fault Slip Rates and Potential Seismogenic Asperities on the Partially Creeping Hayward Fault Eileen L. Evans Harvard University John P. Loveless Harvard University, [email protected] Brendan J. Meade Harvard University Follow this and additional works at: https://scholarworks.smith.edu/geo_facpubs Part of the Geology Commons Recommended Citation Evans, Eileen L.; Loveless, John P.; and Meade, Brendan J., "Geodetic Constraints on San Francisco Bay Area Fault Slip Rates and Potential Seismogenic Asperities on the Partially Creeping Hayward Fault" (2012). Geosciences: Faculty Publications, Smith College, Northampton, MA. https://scholarworks.smith.edu/geo_facpubs/21 This Article has been accepted for inclusion in Geosciences: Faculty Publications by an authorized administrator of Smith ScholarWorks. For more information, please contact [email protected] JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 117, B03410, doi:10.1029/2011JB008398, 2012 Geodetic constraints on San Francisco Bay Area fault slip rates and potential seismogenic asperities on the partially creeping Hayward fault Eileen L. Evans,1 John P. Loveless,1,2 and Brendan J. Meade1 Received 28 March 2011; revised 17 November 2011; accepted 31 January 2012; published 31 March 2012. [1] The Hayward fault in the San Francisco Bay Area (SFBA) is sometimes considered unusual among continental faults for exhibiting significant aseismic creep during the interseismic phase of the seismic cycle while also generating sufficient elastic strain to produce major earthquakes. Imaging the spatial variation in interseismic fault creep on the Hayward fault is complicated because of the interseismic strain accumulation associated with nearby faults in the SFBA, where the relative motion between the Pacific plate and the Sierra block is partitioned across closely spaced subparallel faults. -
5.4 Geology and Soils
BEACH BOULEVARD SPECIFIC PLAN DRAFT EIR CITY OF ANAHEIM 5. Environmental Analysis 5.4 GEOLOGY AND SOILS This section of the Draft Environmental Impact Report (DEIR) evaluates the potential for implementation of the Beach Boulevard Specific Plan (Proposed Project) to impact geological and soil resources in the City of Anaheim. 5.4.1 Environmental Setting Regulatory Setting California Alquist-Priolo Earthquake Fault Zoning Act The Alquist-Priolo Earthquake Fault Zoning Act was signed into state law in 1972. Its primary purpose is to mitigate the hazard of fault rupture by prohibiting the location of structures for human occupancy across the trace of an active fault. The act delineates “Earthquake Fault Zones” along faults that are “sufficiently active” and “well defined.” The act also requires that cities and counties withhold development permits for sites within an earthquake fault zone until geologic investigations demonstrate that the sites are not threatened by surface displacement from future faulting. Pursuant to this act, structures for human occupancy are not allowed within 50 feet of the trace of an active fault. Seismic Hazard Mapping Act The Seismic Hazard Mapping Act (SHMA) was adopted by the state in 1990 to protect the public from the effects of nonsurface fault rupture earthquake hazards, including strong ground shaking, liquefaction, seismically induced landslides, or other ground failure caused by earthquakes. The goal of the act is to minimize loss of life and property by identifying and mitigating seismic hazards. The California Geological Survey (CGS) prepares and provides local governments with seismic hazard zone maps that identify areas susceptible to amplified shaking, liquefaction, earthquake-induced landslides, and other ground failures. -
Immersion Into Noise
Immersion Into Noise Critical Climate Change Series Editors: Tom Cohen and Claire Colebrook The era of climate change involves the mutation of systems beyond 20th century anthropomorphic models and has stood, until recent- ly, outside representation or address. Understood in a broad and critical sense, climate change concerns material agencies that im- pact on biomass and energy, erased borders and microbial inven- tion, geological and nanographic time, and extinction events. The possibility of extinction has always been a latent figure in textual production and archives; but the current sense of depletion, decay, mutation and exhaustion calls for new modes of address, new styles of publishing and authoring, and new formats and speeds of distri- bution. As the pressures and re-alignments of this re-arrangement occur, so must the critical languages and conceptual templates, po- litical premises and definitions of ‘life.’ There is a particular need to publish in timely fashion experimental monographs that redefine the boundaries of disciplinary fields, rhetorical invasions, the in- terface of conceptual and scientific languages, and geomorphic and geopolitical interventions. Critical Climate Change is oriented, in this general manner, toward the epistemo-political mutations that correspond to the temporalities of terrestrial mutation. Immersion Into Noise Joseph Nechvatal OPEN HUMANITIES PRESS An imprint of MPublishing – University of Michigan Library, Ann Arbor, 2011 First edition published by Open Humanities Press 2011 Freely available online at http://hdl.handle.net/2027/spo.9618970.0001.001 Copyright © 2011 Joseph Nechvatal This is an open access book, licensed under the Creative Commons By Attribution Share Alike license. Under this license, authors allow anyone to download, reuse, reprint, modify, distribute, and/or copy this book so long as the authors and source are cited and resulting derivative works are licensed under the same or similar license. -
Geological Time Conventions and Symbols
AL SOCIET IC Y G O O F L A O M E E G R I E C H A T GROUNDWORK Furthering the Influence of Earth Science internally and with respect to SI (Le Système international Geological Time d’unités)” (Holden et al., 2011a, 2011b), because that is the justification being offered in support of a change. This assertion cannot be sustained. No one objects to the storming of the Conventions and Symbols Bastille on 14 July 1789 (a date) or to the construction of Stonehenge from 2600–1600 BC (an interval specified by two Nicholas Christie-Blick, Dept. of Earth and Environmental dates). In the case of the latter, we say that the job took 1000 Sciences and Lamont-Doherty Earth Observatory of Columbia years, not 1000 BC. The distinction between geohistorical dates University, Palisades, New York 10964, USA; [email protected] and spans of geological time is conceptually analogous. There is no internal inconsistency, and the International System of Units All science involves conventions. Although subordinate to the (SI) rules don’t apply to dates in either case because points in task of figuring out how the natural world functions, such time are not units, even if they are specified in years (Aubry et conventions are necessary for clear communication, and because al., 2009). The year, moreover, is not a part of the SI. It cannot be they are a matter of choice rather than discovery, they ought to a “derived unit of time,” the designation proposed by the task reflect the diverse preferences and needs of the communities for group, because under SI conventions “derived units are products which they are intended. -
I Final Technical Report United States Geological Survey National
Final Technical Report United States Geological Survey National Earthquake Hazards Reduction Program - External Research Grants Award Number 08HQGR0140 Third Conference on Earthquake Hazards in the Eastern San Francisco Bay Area: Science, Hazard, Engineering and Risk Conference Dates: October 22nd-26th, 2008 Location: California State University, East Bay Principal Investigator: Mitchell S. Craig Department of Earth and Environmental Sciences California State University, East Bay Submitted March 2010 Summary The Third Conference on Earthquake Hazards in the Eastern San Francisco Bay Area was held October 22nd-26th, 2008 at California State University, East Bay. The conference included three days of technical presentations attended by over 200 participants, a public forum, two days of field trips, and a one-day teacher training workshop. Over 100 technical presentations were given, including oral and poster presentations. A printed volume containing the conference program and abstracts of presentations (attached) was provided to attendees. Participants included research scientists, consultants, emergency response personnel, and lifeline agency engineers. The conference provided a rare opportunity for professionals from a wide variety of disciplines to meet and discuss common strategies to address region-specific seismic hazards. The conference provided participants with a comprehensive overview of the vast amount of new research that has been conducted and new methods that have been employed in the study of East Bay earthquake hazards since the last East Bay Earthquake Conference was held in 1992. Topics of presentations included seismic and geodetic monitoring of faults, trench-based fault studies, probabilistic seismic risk analysis, earthquake hazard mapping, and models of earthquake rupture, seismic wave propagation, and ground shaking. -
Structural Superposition in Fault Systems Bounding Santa Clara Valley, California
A New Three-Dimensional Look at the Geology, Geophysics, and Hydrology of the Santa Clara (“Silicon”) Valley themed issue Structural superposition bounding Santa Clara Valley Structural superposition in fault systems bounding Santa Clara Valley, California R.W. Graymer, R.G. Stanley, D.A. Ponce, R.C. Jachens, R.W. Simpson, and C.M. Wentworth U.S. Geological Survey, 345 Middlefi eld Road, MS 973, Menlo Park, California 94025, USA ABSTRACT We use the term “structural superposition” to and/or reverse-oblique faults, including the emphasize that younger structural features are Silver Creek Thrust1 (Fig. 3). The reverse and/or Santa Clara Valley is bounded on the on top of older structural features as a result of reverse-oblique faults are generated by a com- southwest and northeast by active strike-slip later tectonic deformation, such that they now bination of regional fault-normal compression and reverse-oblique faults of the San Andreas conceal or obscure the older features. We use the (Page, 1982; Page and Engebretson, 1984) fault system. On both sides of the valley, these term in contrast to structural reactivation, where combined with the restraining left-step transfer faults are superposed on older normal and/or pre existing structures accommodate additional of slip between the central Calaveras fault and right-lateral normal oblique faults. The older deformation, commonly in a different sense the southern Hayward fault (Aydin and Page, faults comprised early components of the San from the original deformation (e.g., a normal 1984; Andrews et al., 1993; Kelson et al., 1993). Andreas fault system as it formed in the wake fault reactivated as a reverse fault), and in con- Approximately two-thirds of present-day right- of the northward passage of the Mendocino trast to structural overprinting, where preexisting lateral slip on the southern part of the Calaveras Triple Junction. -
Terminology of Geological Time: Establishment of a Community Standard
Terminology of geological time: Establishment of a community standard Marie-Pierre Aubry1, John A. Van Couvering2, Nicholas Christie-Blick3, Ed Landing4, Brian R. Pratt5, Donald E. Owen6 and Ismael Ferrusquía-Villafranca7 1Department of Earth and Planetary Sciences, Rutgers University, Piscataway NJ 08854, USA; email: [email protected] 2Micropaleontology Press, New York, NY 10001, USA email: [email protected] 3Department of Earth and Environmental Sciences and Lamont-Doherty Earth Observatory of Columbia University, Palisades NY 10964, USA email: [email protected] 4New York State Museum, Madison Avenue, Albany NY 12230, USA email: [email protected] 5Department of Geological Sciences, University of Saskatchewan, Saskatoon SK7N 5E2, Canada; email: [email protected] 6Department of Earth and Space Sciences, Lamar University, Beaumont TX 77710 USA email: [email protected] 7Universidad Nacional Autónomo de México, Instituto de Geologia, México DF email: [email protected] ABSTRACT: It has been recommended that geological time be described in a single set of terms and according to metric or SI (“Système International d’Unités”) standards, to ensure “worldwide unification of measurement”. While any effort to improve communication in sci- entific research and writing is to be encouraged, we are also concerned that fundamental differences between date and duration, in the way that our profession expresses geological time, would be lost in such an oversimplified terminology. In addition, no precise value for ‘year’ in the SI base unit of second has been accepted by the international bodies. Under any circumstances, however, it remains the fact that geologi- cal dates – as points in time – are not relevant to the SI. -
Pdf/13/2/269/1000918/269.Pdf 269 by Guest on 24 September 2021 Research Paper
Research Paper THEMED ISSUE: A New Three-Dimensional Look at the Geology, Geophysics, and Hydrology of the Santa Clara (“Silicon”) Valley GEOSPHERE The Evergreen basin and the role of the Silver Creek fault in the San Andreas fault system, San Francisco Bay region, California GEOSPHERE; v. 13, no. 2 R.C. Jachens1, C.M. Wentworth1, R.W. Graymer1, R.A. Williams2, D.A. Ponce1, E.A. Mankinen1, W.J. Stephenson2, and V.E. Langenheim1 doi:10.1130/GES01385.1 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA 2U.S. Geological Survey, 1711 Illinois St., Golden, Colorado 80401, USA 9 figures CORRESPONDENCE: zulanger@ usgs .gov ABSTRACT Silver Creek fault has had minor ongoing slip over the past few hundred thou- sand years. Two earthquakes with ~M6 occurred in A.D. 1903 in the vicinity of CITATION: Jachens, R.C., Wentworth, C.M., Gray- The Evergreen basin is a 40-km-long, 8-km-wide Cenozoic sedimentary the Silver Creek fault, but the available information is not sufficient to reliably mer, R.W., Williams, R.A., Ponce, D.A., Mankinen, E.A., Stephenson, W.J., and Langenheim, V.E., 2017, basin that lies mostly concealed beneath the northeastern margin of the identify them as Silver Creek fault events. The Evergreen basin and the role of the Silver Creek Santa Clara Valley near the south end of San Francisco Bay (California, USA). fault in the San Andreas fault system, San Francisco The basin is bounded on the northeast by the strike-slip Hayward fault and Bay region, California: Geosphere, v.