DOCSLIB.ORG

Summary of Workshops Concerning Regional Seismic Source Zones of Parts of the Conterminous United States, Convened by the U.S

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Summary of Workshops Concerning Regional Seismic Source Zones of Parts of the Conterminous United States, Convened by the U.S GEOLOGICAL SURVEY CIRCULAR 898 Summary of Workshops Concerning Regional Seismic Source Zones of Parts of the Conterminous United States, Convened by the U.S. Geological Survey 1979-1980, Golden, Colorado Summary of Workshops Concerning Regional Seismic Source Zones of Parts of the Conterminous United States Convened by the U.S. Geological Survey 1979-1980, Golden, Colorado Edited by Paul C. Thenhaus GEOLOGICAL SURVEY CIRCULAR 898 J983 United States Department of the Interior WILLIAM P. CLARK, Secretary Geological Survey Dallas L. Peck, Director Free on application to the Branch of Distribution, Eastern Region, U.S. Geological Survey, 604 South Pickett Street, Alexandria, VA 22034 CONTENTS Page Abstract ............................................ 1 Introduction, by P. C. Thenhaus and F. A. McKeown .................. 1 Acknowledgments ....................................... 4 Great Basin seismic source zones Summary of workshop convened October 10-11, 1979, by R. C. Bucknam and P. C. Thenhaus ........................ 4 Northern Rocky Mountains seismic source zones Summary of workshop convened December 6-7, 1979, by F. A. McKeown, D. C. Ross, and P. C. Thenhaus ... 9 Southern Rocky Mountains seismic source zones Summary of workshop convened January 23-24, 1980, by R. E. Anderson, W. P. Irwin, and P. C. Thenhaus ....... 14 Central Interior seismic source zones Summary of workshop convened June 10-11, 1980, by F. A. McKeown, D. P. Russ, and P. C. Thenhaus ............... 19 Northeastern United States seismic source zones Summary of workshop convened Sep­ tember 10-11, 1980, by W. H. Diment, F. A. McKeown, and P. C. Thenhaus . 24 Summary, by P. C. Thenhaus ................................ 31 References cited ........................................ 32 ILLUSTRATIONS FIGURES 1-11. Maps: 1. Five regions of the conterminous United States discussed at seismic source zone workshops . 2 2. Index of the Great Basin region ................................... 5 3. Seismic source zones of the Great Basin .............................. 7 4. Index of Northern Rocky Mountain region ............................. 10 5. Seismic source zones of the Northern Rocky Mountains ..................... 13 6. Index of the Southern Rocky Mountains region .......................... 16 7. Seismic source zones of the Southern Rocky Mountains ...................... 17 8. Index of the Central Interior .................................... 21 9. Seismic source zones of the Central Interior ............................ 22 10. Index of the Northeastern United States .............................. 26 11. Seismic source zones of the Northeastern United States ..................... 27 TABLES Page TABLE 1. Estimated maximum magnitudes and recurrence rates from geologic data for earthquakes M8>7 in the Great Basin seismic source zones .......................................... 8 2. Estimated maximum magnitudes (M8) and estimated relative recurrence of maximum magnitude events for the source zones of the Northern Rocky Mountains region ........................ 14 3. Estimated maximum magnitudes (Ms) and estimated relative recurrence of maximum magnitude events for the source zones of the Southern Rocky Mountains region ........................ 18 4. Estimated maximum magnitudes (Mb) and estimated recurrence rates for maximum magnitude events for the seismic source zones of the Central Interior region .......................... 23 5. Estimated maximum magnitudes for seismic source zones of the northeastern United States and adjacent Canada ...................................................... 28 III Summary of workshops concerning regional seismic source zones of parts of the conterminous United States, convened by the U.S. Geological Survey, 1979-1980, Golden, Colorado Edited by Paul C. Thenhaus ABSTRACT interval of earthquakes in each of the zones, and (3) calculation of cumulative probability distribu­ Workshops were convened by the U.S. Geological Survey to obtain the latest information and concepts relative to defin­ tions of expected acceleration exceedences for ing seismic source zones for five regions of the United States. points in the region. A major part of the first task The zones, with some modifications, have been used in prepara­ in the preparation of the new maps is to incorpo­ tion of new national probabilistic ground motion hazard maps rate the most recent information and ideas related by the U.S. Geological Survey. to the seismicity, geology, and geophysics of vari­ The five regions addressed are the Great Basin, the North­ ern Rocky Mountains, the Southern Rocky Mountains, the ous parts of the country. This report is primarily Central Interior, and the northeastern United States. Discus­ a description of the first task the delineation of sions at the workshops focussed on possible temporal and spa­ seismic source zones. tial variations of seismicity within the regions, latest ages of In an effort to utilize the most recent, pertinent surface-fault displacements, most recent uplift or subsidence, geologic structural provinces as they relate to seismicity, and information from a variety of disciplines and for speculation on earthquake causes. a variety of areas across the country, informal Within the Great Basin region, the zones conform to areas workshops were convened by the U.S. Geological characterized by a predominance of faults that have certain Survey in Golden, Colo., in late 1979 and early ages of latest surface displacements. In the Northern and 1980. The number of workshops convened was lim­ Southern Rocky Mountain regions, zones primarily conform to distinctive structural terrane. In the Central Interior, primary ited by budget considerations. A difficult decision, emphasis was placed on an interpretation of the areal distribu­ therefore, was to determine which regions of the tion of historic seismicity, although geophysical studies in the United States would benefit greatest from these Reelfoot rift area provided data for defining zones in the New workshops. Seismic source zoning of the east and Madrid earthquake area. An interpretation of the historic seis­ west coasts had been addressed in studies com­ micity also provided the basis for drawing the zones of the pleted just prior to the planning of the 1979-1980 New England region. Estimates of earthquake maximum magnitudes and of re­ seismic source zone workshops (Perkins and currence times for these earthquakes are given for most of others, 1979; Perkins and others, 1980; Thenhaus the zones and are based on either geologic data or opinion. and others, 1980). A predecessor to the 1979-1980 workshops was convened in September 1978 at the INTRODUCTION U.S. Geological Survey's office in Woods Hole, By P. C. Thenhaus and F. A. McKeown Mass., to gather recent information that might have a bearing on seismic source zones for the Under the Earthquake Hazards Reduction act eastern United States. Source zones defined as a of 1977 (Public Law 95-124, Executive Office of result of information acquired at that meeting are the President, 1978) the U.S. Geological Survey discussed by Perkins and others (1979). Because has been given the responsibility for producing source zones for the east and west coasts incorpo­ earthquake hazard and seismic risk maps on both rated the most recent information available as of a regional and national scale. The maps are in­ 1978-1979, they were excluded from consideration tended to aid in the mitigation of the short-term in planning the 1979^1980 workshops. Throughout earthquake hazard to buildings of standard con­ the remaining part of the United States, the gen­ struction. The preparation of these maps requires eral governing principle was to choose those re­ completion of three major tasks: (1) delineation of gions where geological, geophysical, and seis- seismic source zones, (2) analysis of the recurrence mological research of the past 5 years contributed -4.^ NORTHEAST I/ NORTHERN ^ UNITE NTAINS | / *U FIGURE 1. Five regions of the conterminous United States discussed at seismic source zone workshops convened by the U.S. Greological Survey, 1979-1980. Numbered zones are shown on figure indicated in parentheses. significantly to the understanding of the seis- length, continuity, mode of displacement, or in lo­ motectonics of the region. The regions chosen cation with respect to range fronts or within ba­ were the (1) Great Basin, (2) Northern Rocky sins, and so forth? If differences can be recog­ Mountains, (3) Southern Rocky Mountains, (4) nized, is there any relationship to seismicity pat­ Central Interior, and (5) northeastern United terns or size of earthquakes? States (fig. 1). 7. Is there strong evidence that various structural, The workshops provided a forum for (1) present­ tectonic, or geophysical features, including aver­ ing and discussing current research, some of which age elevation, heatflow, gravity or magnetic gra­ is in a formative stage, (2) speculating on the na­ dients, or volcanic centers, are correlative with ture of the earthquake-generating process operat­ seismicity and, therefore, indicate constraints on ing on a regional scale, (3) voicing concerns and the distribution of seismicity? recommendations for various seismic source zones, Zones resulting from these considerations are and (4) suggesting various treatments of these shown in figures 3, 5, 7, 9, and 11. The zones zones in application to probabilistic hazard maps. are numbered consecutively (1 through 75) in ac­ Prior to each workshop, participants were asked cord with the chronological
Load more

Recommended publications
  • Bilek Earth and Environmental Sciences Dept
    Susan L. Bilek Earth and Environmental Sciences Dept. New Mexico Institute of Mining and Technology, Socorro, NM 87801 Email: [email protected] Webpage: https://nmt.edu/academics/ees/faculty/sbilek.php Professional Preparation: B.S., with honors, Geosciences, minor in Economics, Penn State University, May 1996 M.S., Earth Sciences/Geophysics, University of California, Santa Cruz, June 1998 M.S. Thesis title: Lower mantle heterogeneity beneath Eurasia imaged by parametric migration of shear waves Ph.D. Earth Sciences/Geophysics, University of California, Santa Cruz, June 2001 Ph.D. Dissertation title: Multi-scale examination of seismogenic zone processes in circum- Pacific subduction zones Turner Postdoctoral Fellow, Dept. Geological Sciences, University of Michigan, 2001-2003 Appointments: Professor, Earth and Environmental Science Dept., New Mexico Tech, 2014 – present Associate Professor, Earth and Environmental Sciences Dept., New Mexico Tech, 2008 – 2014 Assistant Professor, Earth and Environmental Sciences Dept., New Mexico Tech, 2003 – 2008 Selected Recent Synergistic Activities: National/International: Board of Directors, Seismological Society of America, 2020-2022 Associate Editor, Geophysical Research Letters, 2020-present Editorial Board, Tectonophysics, 2016-present Associate Guest Editor, Subduction Top to Bottom 2, special issue of Geospheres, 2016-present PI of IRIS PASSCAL Instrument Center, Oct 2013-present IRIS Board of Directors, 2010-2012, Board secretary 2012 Reviewer: NSF, NNSA, Science, Science Advances, Nature,
    [Show full text]
  • Cambridge University Press 978-1-108-44568-9 — Active Faults of the World Robert Yeats Index More Information
    Cambridge University Press 978-1-108-44568-9 — Active Faults of the World Robert Yeats Index More Information Index Abancay Deflection, 201, 204–206, 223 Allmendinger, R. W., 206 Abant, Turkey, earthquake of 1957 Ms 7.0, 286 allochthonous terranes, 26 Abdrakhmatov, K. Y., 381, 383 Alpine fault, New Zealand, 482, 486, 489–490, 493 Abercrombie, R. E., 461, 464 Alps, 245, 249 Abers, G. A., 475–477 Alquist-Priolo Act, California, 75 Abidin, H. Z., 464 Altay Range, 384–387 Abiz, Iran, fault, 318 Alteriis, G., 251 Acambay graben, Mexico, 182 Altiplano Plateau, 190, 191, 200, 204, 205, 222 Acambay, Mexico, earthquake of 1912 Ms 6.7, 181 Altunel, E., 305, 322 Accra, Ghana, earthquake of 1939 M 6.4, 235 Altyn Tagh fault, 336, 355, 358, 360, 362, 364–366, accreted terrane, 3 378 Acocella, V., 234 Alvarado, P., 210, 214 active fault front, 408 Álvarez-Marrón, J. M., 219 Adamek, S., 170 Amaziahu, Dead Sea, fault, 297 Adams, J., 52, 66, 71–73, 87, 494 Ambraseys, N. N., 226, 229–231, 234, 259, 264, 275, Adria, 249, 250 277, 286, 288–290, 292, 296, 300, 301, 311, 321, Afar Triangle and triple junction, 226, 227, 231–233, 328, 334, 339, 341, 352, 353 237 Ammon, C. J., 464 Afghan (Helmand) block, 318 Amuri, New Zealand, earthquake of 1888 Mw 7–7.3, 486 Agadir, Morocco, earthquake of 1960 Ms 5.9, 243 Amurian Plate, 389, 399 Age of Enlightenment, 239 Anatolia Plate, 263, 268, 292, 293 Agua Blanca fault, Baja California, 107 Ancash, Peru, earthquake of 1946 M 6.3 to 6.9, 201 Aguilera, J., vii, 79, 138, 189 Ancón fault, Venezuela, 166 Airy, G.
    [Show full text]
  • Bedrock Geologic Map of the Monmouth Junction Quadrangle, Water Resources Management U.S
    DEPARTMENT OF ENVIRONMENTAL PROTECTION Prepared in cooperation with the BEDROCK GEOLOGIC MAP OF THE MONMOUTH JUNCTION QUADRANGLE, WATER RESOURCES MANAGEMENT U.S. GEOLOGICAL SURVEY SOMERSET, MIDDLESEX, AND MERCER COUNTIES, NEW JERSEY NEW JERSEY GEOLOGICAL AND WATER SURVEY NATIONAL GEOLOGIC MAPPING PROGRAM GEOLOGICAL MAP SERIES GMS 18-4 Cedar EXPLANATION OF MAP SYMBOLS cycle; lake level rises creating a stable deep lake environment followed by a fall in water level leading to complete Cardozo, N., and Allmendinger, R. W., 2013, Spherical projections with OSXStereonet: Computers & Geosciences, v. 51, p. 193 - 205, doi: 74°37'30" 35' Hill Cem 32'30" 74°30' 5 000m 5 5 desiccation of the lake. Within the Passaic Formation, organic-rick black and gray beds mark the deep lake 10.1016/j.cageo.2012.07.021. 32 E 33 34 535 536 537 538 539 540 541 490 000 FEET 542 40°30' 40°30' period, purple beds mark a shallower, slightly less organic-rich lake, and red beds mark a shallow oxygenated 6 Contacts 100 M Mettler lake in which most organic matter was oxidized. Olsen and others (1996) described the next longer cycle as the Christopher, R. A., 1979, Normapolles and triporate pollen assemblages from the Raritan and Magothy formations (Upper Cretaceous) of New 6 A 100 I 10 N Identity and existance certain, location accurate short modulating cycle, which is made up of five Van Houten cycles. The still longer in duration McLaughlin cycles Jersey: Palynology, v. 3, p. 73-121. S T 44 000m MWEL L RD 0 contain four short modulating cycles or 20 Van Houten cycles (figure 1).
    [Show full text]
  • Universite Du Quebec a Chicoutimi
    UNIVERSITE DU QUEBEC A CHICOUTIMI CHRONOSTRATIGRAPHÏE ET PETROGRAPHIE DU COMPLEXE GNEISSIQUE DE CHICOUTIMI EN BORDURE DU COMPLEXE ANORTHOSITIQUE DU LAC ST-JEAN par MICHEL HERVET Département des Sciences Appliquées MEMOIRE PRESENTE EN VUE DE L'OBTENTION DE LA MAITRISE EN SCIENCES APPLIQUEES EN GEOLOGIE SEPTEMBRE 1986 UIUQAC bibliothèque Paul-Emile-Bouletj Mise en garde/Advice Afin de rendre accessible au plus Motivated by a desire to make the grand nombre le résultat des results of its graduate students' travaux de recherche menés par ses research accessible to all, and in étudiants gradués et dans l'esprit des accordance with the rules règles qui régissent le dépôt et la governing the acceptation and diffusion des mémoires et thèses diffusion of dissertations and produits dans cette Institution, theses in this Institution, the l'Université du Québec à Université du Québec à Chicoutimi (UQAC) est fière de Chicoutimi (UQAC) is proud to rendre accessible une version make a complete version of this complète et gratuite de cette œuvre. work available at no cost to the reader. L'auteur conserve néanmoins la The author retains ownership of the propriété du droit d'auteur qui copyright of this dissertation or protège ce mémoire ou cette thèse. thesis. Neither the dissertation or Ni le mémoire ou la thèse ni des thesis, nor substantial extracts from extraits substantiels de ceux-ci ne it, may be printed or otherwise peuvent être imprimés ou autrement reproduced without the author's reproduits sans son autorisation. permission. RESUME Le Complexe
    [Show full text]
  • 2D Seismic Survey in Block AD- 10, Offshore Myanmar
    2D Seismic Survey in Block AD- 10, Offshore Myanmar Initial Environmental Examination 02 December 2015 Environmental Resources Management www.erm.com The world’s leading sustainability consultancy 2D Seismic Survey in Block AD-10, Environmental Resources Management Offshore Myanmar ERM-Hong Kong, Limited 16/F, Berkshire House 25 Westlands Road Initial Environmental Examination Quarry Bay Hong Kong Telephone: (852) 2271 3000 Facsimile: (852) 2723 5660 Document Code: 0267094_IEE_Cover_AD10_EN.docx http://www.erm.com Client: Project No: Statoil Myanmar Private Limited 0267094 Summary: Date: 02 December 2015 Approved by: This document presents the Initial Environmental Examination (IEE) for 2D Seismic Survey in Block AD-10, as required under current Draft Environmental Impact Assessment Procedures Craig A. Reid Partner 1 Addressing MOECAF Comments, Final for MOGE RS CAR CAR 02/12/2015 0 Draft Final RS JNG CAR 31/08/2015 Revision Description By Checked Approved Date Distribution Internal Public Confidential CONTENTS 1 EXECUTIVE SUMMARY 1-1 1.1 PURPOSE AND EXTENT OF THE IEE REPORT 1-1 1.2 SUMMARY OF THE ACTIVITIES UNDERTAKEN DURING THE IEE STUDY 1-2 1.3 PROJECT ALTERNATIVES 1-2 1.4 DESCRIPTION OF THE ENVIRONMENT TO BE AFFECTED BY THE PROJECT 1-4 1.5 SIGNIFICANT ENVIRONMENTAL IMPACTS 1-5 1.6 THE PUBLIC CONSULTATION AND PARTICIPATION PROCESS 1-6 1.7 SUMMARY OF THE EMP 1-7 1.8 CONCLUSIONS AND RECOMMENDATIONS OF THE IEE REPORT 1-8 2 INTRODUCTION 2-1 2.1 PROJECT OVERVIEW 2-1 2.2 PROJECT PROPONENT 2-1 2.3 THIS INITIAL ENVIRONMENTAL EVALUATION (IEE)
    [Show full text]
  • ADUA Azerbaijan 2D-3D Seismic Survey Environmental Impact
    Environmental Impact Assessment (EIA) for 2D-3D Doc. No. seismic survey in the Ashrafi-Dan Ulduzu-Aypara (ADUA) Exploration area, Azerbaijan Valid from Rev. no. 0 01.03.2019 Environmental Impact Assessment (EIA) for 2D-3D seismic survey in the Ashrafi-Dan Ulduzu-Aypara (ADUA) Exploration area, Azerbaijan March 2019 Environmental Impact Assessment (EIA) for 2D-3D seismic survey in the Ashrafi-Dan Ulduzu-Aypara (ADUA) Exploration area, Azerbaijan Valid from 01.03.2019 Rev. no. 0 Table of contents Acronyms ...................................................................................................................................................... 10 Executive Summary ...................................................................................................................................... 13 Regulatory Framework .................................................................................................................................... 14 Project Description .......................................................................................................................................... 17 Description of the Environmental and Social Baseline ................................................................................... 18 Impact Assessment and Mitigation ................................................................................................................. 22 Environmental Management Plan ..................................................................................................................
    [Show full text]
  • Cenozoic Thermal, Mechanical and Tectonic Evolution of the Rio Grande Rift
    JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 91, NO. B6, PAGES 6263-6276, MAY 10, 1986 Cenozoic Thermal, Mechanical and Tectonic Evolution of the Rio Grande Rift PAUL MORGAN1 Departmentof Geosciences,Purdue University,West Lafayette, Indiana WILLIAM R. SEAGER Departmentof Earth Sciences,New Mexico State University,Las Cruces MATTHEW P. GOLOMBEK Jet PropulsionLaboratory, CaliforniaInstitute of Technology,Pasadena Careful documentationof the Cenozoicgeologic history of the Rio Grande rift in New Mexico reveals a complexsequence of events.At least two phasesof extensionhave been identified.An early phase of extensionbegan in the mid-Oligocene(about 30 Ma) and may have continuedto the early Miocene (about 18 Ma). This phaseof extensionwas characterizedby local high-strainextension events (locally, 50-100%,regionally, 30-50%), low-anglefaulting, and the developmentof broad, relativelyshallow basins, all indicatingan approximatelyNE-SW •-25ø extensiondirection, consistent with the regionalstress field at that time.Extension events were not synchronousduring early phase extension and were often temporally and spatiallyassociated with major magmatism.A late phaseof extensionoccurred primarily in the late Miocene(10-5 Ma) with minor extensioncontinuing to the present.It was characterizedby apparently synchronous,high-angle faulting givinglarge verticalstrains with relativelyminor lateral strain (5-20%) whichproduced the moderuRio Granderift morphology.Extension direction was approximatelyE-W, consistentwith the contemporaryregional stress field. Late phasegraben or half-grabenbasins cut and often obscureearly phasebroad basins.Early phase extensionalstyle and basin formation indicate a ductilelithosphere, and this extensionoccurred during the climax of Paleogenemagmatic activity in this zone.Late phaseextensional style indicates a more brittle lithosphere,and this extensionfollowed a middle Miocenelull in volcanism.Regional uplift of about1 km appearsto haveaccompanied late phase extension, andrelatively minor volcanism has continued to thepresent.
    [Show full text]
  • Types of Seismic Energy Sources for Petroleum Exploration in Desert, Dry-Land, Swamp and Marine Environments in Nigeria and Other Sub- Saharan Africa
    International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index Copernicus Value (2015): 78.96 | Impact Factor (2015): 6.391 Types of Seismic Energy Sources for Petroleum Exploration in Desert, Dry-Land, Swamp and Marine Environments in Nigeria and Other Sub- Saharan Africa Madu Anthony Joseph Chinenyeze Department of Geology, College of Physical And Applied Sciences, Michael Okpara University of Agriculture Umudike, Abia State, Nigeria Abstract: The various seismic energy sources used for petroleum exploration in Nigeria (Niger Delta, Benue Trough, Chad Basin) and sub-Saharan Africa (Niger Republic, Sudan, Ethiopia inclusive) have been undergoing improvement over the years. Explosive source usually Dynamite, Airgun, Thumper/Weight Drop, and Vibrators are remarkable seismic energy sources today with frequencies for primary seismic production, bandwidth 10Hz – 75Hz. These sources contribute to higher S/N ratio and greater bandwidth. The spectral analysis of shot records from the afore-mentioned energy sources confirm their corresponding suitability, effectiveness, and adequacy for wave propagation into the ground, until it encountered an impedance in the subsurface. The latter condition results in reflections and refractions which are picked by the receivers or sensors (geophones or hydrophones). The spectral analyses from these selected sources reveal comparable range of signal frequencies. The Thumpers or vibrator shots at any given shot point location SP, is repeated severally for the purpose of enhancement and then summed or stacked. This is also called vibrator sweep, as it vibrates repeatedly according to specification of program issue. In the repetition of frequency sweep, amplitude increases are optimized to a specific level within the same duration.
    [Show full text]
  • Letter Regarding the Status of Open File Report Entitled, "Basin & Range-Age Reactivation of Rocky Mountain Structures
    # I 2 BUREAU OF ECONOiC GEOLOGY THE UNIVERSITY OF TEXAS AT AUSTIN W'M OCKET N0TROL lSt To78713-750-(512)471-1534or471-7721(jZE *87 JIN -9 A1O:26 June 1, 1987 WM RecorgFile WM Project / /WI Docket No. 13 Dr. Theodore J. Taylor Salt Repository Project Office )rLPDRt adI9 n _ __ ta_ . U. 3* Uepdriinent UT Energy Dii b.iO 110 North 25 Mile Avenue _ _______- Hereford, TX 79045 Reference: Contract No. DE-AC97-83WM466t M __ ______ Dear Dr. Taylor: Per a request from Susan Heston to Chris Lewis, the status of the open-file report entitled *Basin and Range-Age Reactiviation of Rocky Mountain Structures in the Texas Panhandle, (OF-WTWI-1986-3),m by R. Budnik, is as follows. Dr. Budnik left the Bureau in August, 1986. The manuscript was revised by Dr. Budnik to reflect comments from GSA reviewers and resubmitted to the Journal before DOE comments were received at the Bureau. The article was published in the February, 1987 issue of Geology. Please note the title of the article was changed, it is now entitled nLate Miocene Reactivation of Ancestral Rocky Mountain Structures in the Texas Panhandle: A Response to Basin and Range Extension." Three copies of the reprinted article are enclosed. Also, the above referenced article supersedes OF-WTWI-1986-3. If you have any questions, please do not hesitate to contact me. Sincerely, Asoc iat cto Associate Director DCR:CL:cl Enclosures cc: P. Archer (BPMD) S. Heston (SRPO) F. Brown C. Lewis T. Clareson (BPMD/GRC) J. Raney S.
    [Show full text]
  • Article (PDF, 237
    Workshop White Papers Sci. Dril., 18, 19–33, 2014 www.sci-dril.net/18/19/2014/ doi:10.5194/sd-18-19-2014 © Author(s) 2014. CC Attribution 3.0 License. Drilling to investigate processes in active tectonics and magmatism J. Shervais1, J. Evans1, V. Toy2, J. Kirkpatrick3, A. Clarke4, and J. Eichelberger5 1Utah State University, Logan, Utah 84322, USA 2University of Otago, P.O. Box 56, Dunedin 9054, New Zealand 3Colorado State University, Fort Collins, Colorado 80524, USA 4Arizona State University, Tempe, Arizona 85287, USA 5University of Alaska, Fairbanks, Fairbanks, Alaska 99775, USA Correspondence to: J. Shervais ([email protected]) Received: 7 January 2014 – Revised: 5 May 2014 – Accepted: 19 May 2014 – Published: 22 December 2014 Abstract. Coordinated drilling efforts are an important method to investigate active tectonics and magmatic processes related to faults and volcanoes. The US National Science Foundation (NSF) recently sponsored a series of workshops to define the nature of future continental drilling efforts. As part of this series, we convened a workshop to explore how continental scientific drilling can be used to better understand active tectonic and magmatic processes. The workshop, held in Park City, Utah, in May 2013, was attended by 41 investigators from seven countries. Participants were asked to define compelling scientific justifications for examining problems that can be addressed by coordinated programs of continental scientific drilling and related site investigations. They were also asked to evaluate a wide range of proposed drilling projects, based on white papers submitted prior to the workshop. Participants working on faults and fault zone processes highlighted two overarching topics with exciting po- tential for future scientific drilling research: (1) the seismic cycle and (2) the mechanics and architecture of fault zones.
    [Show full text]
  • UNITED STATES DEPARTMENT of the INTERIOR BUREAU of OCEAN ENERGY MANAGEMENT SITE-SPECIFIC ENVIRONMENTAL ASSESSMENT GEOLOGICAL &Am
    GEOPHYSICAL EXPLORATION FOR MINERAL RESOURCES SEA NO. L19-009 UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF OCEAN ENERGY MANAGEMENT GULF OF MEXICO OCS REGION NEW ORLEANS, LOUISIANA SITE-SPECIFIC ENVIRONMENTAL ASSESSMENT OF GEOLOGICAL & GEOPHYSICAL SURVEY APPLICATION NO. L19-009 FOR SHELL OFFSHORE INC. April 2, 2019 RELATED ENVIRONMENTAL DOCUMENTS GulfofMexico OCS Proposed Geological and Geophysical Activities Westem, Central, and Eastem Planning Areas Final Programmatic Environmental Impact Statement (OCS EIS/EA BOEM 2017-051) GulfofMexico OCS Oil and Gas Lease Sales: 2017-2022 GulfofMexico Lease Sales 249, 250, 251, 252, 253, 254, 256, 257, 259, and 261 Final Environmental Impact Statement (OCS EIS/EA BOEM 2017-009) Gulf ofMexico OCS Lease Sale Final Supplemental Environmental Impact Statement 2018 (OCS EIS/EA BOEM 2017-074) FINDING OF NO SIGNIFICANT IMPACT (FONSI) The Bureau of Ocean Energy Management (BOEM) has prepared a Site-Specific Environmental Assessment (SEA) (No. L19-009) complying with the National Environmental Policy Act (NEPA). NEPA regulations under the Council on Environmental Quality (CEQ) (40 CFR § 150 E3 and § 1508.9), die United States Department of the Interior (DOI) NEPA implementing regulations (43 CFR § 46), and BOEM policy require an evaluation of proposed major federal actions, which under BOEM jurisdiction includes approving a plan for oil and gas exploration or development activity on the Outer Continental Shelf (OCS). NEPA regulation 40 CFR § 1508.27(b) requires significance to be evaluated in terms of
    [Show full text]
  • Paper 4: Seismic Methods for Determining Earthquake Source
    Paper 4: Seismic methods for determining earthquake source parameters and lithospheric structure WALTER D. MOONEY U.S. Geological Survey, MS 977, 345 Middlefield Road, Menlo Park, California 94025 For referring to this paper: Mooney, W. D., 1989, Seismic methods for determining earthquake source parameters and lithospheric structure, in Pakiser, L. C., and Mooney, W. D., Geophysical framework of the continental United States: Boulder, Colorado, Geological Society of America Memoir 172. ABSTRACT The seismologic methods most commonly used in studies of earthquakes and the structure of the continental lithosphere are reviewed in three main sections: earthquake source parameter determinations, the determination of earth structure using natural sources, and controlled-source seismology. The emphasis in each section is on a description of data, the principles behind the analysis techniques, and the assumptions and uncertainties in interpretation. Rather than focusing on future directions in seismology, the goal here is to summarize past and current practice as a companion to the review papers in this volume. Reliable earthquake hypocenters and focal mechanisms require seismograph locations with a broad distribution in azimuth and distance from the earthquakes; a recording within one focal depth of the epicenter provides excellent hypocentral depth control. For earthquakes of magnitude greater than 4.5, waveform modeling methods may be used to determine source parameters. The seismic moment tensor provides the most complete and accurate measure of earthquake source parameters, and offers a dynamic picture of the faulting process. Methods for determining the Earth's structure from natural sources exist for local, regional, and teleseismic sources. One-dimensional models of structure are obtained from body and surface waves using both forward and inverse modeling.
    [Show full text]