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Slip Rate of the Western Garlock Fault, at Clark Wash, Near Lone Tree Canyon, Mojave Desert, California
Slip rate of the western Garlock fault, at Clark Wash, near Lone Tree Canyon, Mojave Desert, California Sally F. McGill1†, Stephen G. Wells2, Sarah K. Fortner3*, Heidi Anderson Kuzma1**, John D. McGill4 1Department of Geological Sciences, California State University, San Bernardino, 5500 University Parkway, San Bernardino, California 92407-2397, USA 2Desert Research Institute, PO Box 60220, Reno, Nevada 89506-0220, USA 3Department of Geology and Geophysics, University of Wisconsin-Madison, 1215 W Dayton St., Madison, Wisconsin 53706, USA 4Department of Physics, California State University, San Bernardino, 5500 University Parkway, San Bernardino, California 92407-2397, USA *Now at School of Earth Sciences, The Ohio State University, 275 Mendenhall Laboratory, 125 S. Oval Mall, Columbus, Ohio 43210, USA **Now at Department of Civil and Environmental Engineering, 760 Davis Hall, University of California, Berkeley, California, 94720-1710, USA ABSTRACT than rates inferred from geodetic data. The ously published slip-rate estimates from a simi- high rate of motion on the western Garlock lar time period along the central section of the The precise tectonic role of the left-lateral fault is most consistent with a model in which fault (Clark and Lajoie, 1974; McGill and Sieh, Garlock fault in southern California has the western Garlock fault acts as a conju- 1993). This allows us to assess how the slip rate been controversial. Three proposed tectonic gate shear to the San Andreas fault. Other changes as a function of distance along strike. models yield signifi cantly different predic- mechanisms, involving extension north of the Our results also fi ll an important temporal niche tions for the slip rate, history, orientation, Garlock fault and block rotation at the east- between slip rates estimated at geodetic time and total bedrock offset as a function of dis- ern end of the fault may be relevant to the scales (past decade or two) and fault motions tance along strike. -
Kinematics of the Northern Walker Lane: an Incipient Transform Fault Along the Pacific–North American Plate Boundary
Kinematics of the northern Walker Lane: An incipient transform fault along the Paci®c±North American plate boundary James E. Faulds Christopher D. Henry Nevada Bureau of Mines and Geology, MS 178, University of Nevada, Reno, Nevada 89557, USA Nicholas H. Hinz ABSTRACT GEOLOGIC SETTING In the western Great Basin of North America, a system of dextral faults accommodates As western North America has evolved 15%±25% of the Paci®c±North American plate motion. The northern Walker Lane in from a convergent to a transform margin in northwest Nevada and northeast California occupies the northern terminus of this system. the past 30 m.y., the northern Walker Lane has This young evolving part of the plate boundary offers insight into how strike-slip fault undergone widespread volcanism and tecto- systems develop and may re¯ect the birth of a transform fault. A belt of overlapping, left- nism. Tertiary volcanic strata include 31±23 stepping dextral faults dominates the northern Walker Lane. Offset segments of a W- Ma ash-¯ow tuffs associated with the south- trending Oligocene paleovalley suggest ;20±30 km of cumulative dextral slip beginning ward-migrating ``ignimbrite ¯are up,'' 22±5 ca. 9±3 Ma. The inferred long-term slip rate of ;2±10 mm/yr is compatible with global Ma calc-alkaline intermediate-composition positioning system observations of the current strain ®eld. We interpret the left-stepping rocks related to the ancestral Cascade arc, and faults as macroscopic Riedel shears developing above a nascent lithospheric-scale trans- 13 Ma to present bimodal rocks linked to Ba- form fault. -
Regional Tectonic Systems of the Pacific Northwest Delineated from ERTS-1 Imagery
University of Montana ScholarWorks at University of Montana Graduate Student Theses, Dissertations, & Professional Papers Graduate School 1975 Regional tectonic systems of the Pacific Northwest delineated from ERTS-1 imagery Linda Kay Wackwitz The University of Montana Follow this and additional works at: https://scholarworks.umt.edu/etd Let us know how access to this document benefits ou.y Recommended Citation Wackwitz, Linda Kay, "Regional tectonic systems of the Pacific Northwest delineated from ERTS-1 imagery" (1975). Graduate Student Theses, Dissertations, & Professional Papers. 7103. https://scholarworks.umt.edu/etd/7103 This Thesis is brought to you for free and open access by the Graduate School at ScholarWorks at University of Montana. It has been accepted for inclusion in Graduate Student Theses, Dissertations, & Professional Papers by an authorized administrator of ScholarWorks at University of Montana. For more information, please contact [email protected]. APR 1 6 1984 (iETo;,pr<i a 1384 ' r' r: ^ REGIONAL TECTONIC SYSTEMS OF THE PACIFIC NORTHWEST DELINEATED FROM ERTS-1 IMAGERY by Linda K. Wackwitz B.A. Colby College, 1972 Presented in partial fulfillment of the requirements for the degree of Master of Arts UNIVERSITY OF MONTANA 1975 Approved by Chairman, Board of Examiners / ^ f - / - - -- Dean, Graduate School I ,y. Date UMI Number: EP37904 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. -
KENYA Public Disclosure Authorized
RESTRICTED Report No. AF-26a FILE COPY This report was prepared for use within the Bank and its affiliated organizations. Public Disclosure Authorized They do not accept responsibility for its accuracy or completeness. The report may not be published nor may it be quoted as representing their views. INTERNATIONAL BANK FOR RECONSTRUCTION AND DEVELOPMENT INTERNATIONAL DEVELOPMENT ASSOCIATION Public Disclosure Authorized THE ECONOMY OF KENYA Public Disclosure Authorized July 10, 1964 Public Disclosure Authorized Department of Operations Africa CURRENCY EQUIVALENTS 100 EA cents = 1 EA shilling = U.S. $0. 14 20 EA shillings = L 1 sterling = U. S. $2. 80 6 1 million sterling = U. S. $2. 8 million U.S. $1 = 7. 15 EA shillings U.S. $1 million = L 357, 143 TABLE OF CONTENTS Page IIaps Charts Basic Data Suanary I. BACKGROUND . .. a 1 Country and People . .. .. .. .. .... 1 Constitutional and Political Developments . 2 II. THE EC ONOMY . a o. o. * 5 Structure and Growth . Agriculture . .. 6 Forestry . Q . .. .o . 11 Tourism and Wildlife . .. 12 YMining and Manufacturing . 12 Construction . 13 Electricity and Water ....... 13 Transportation . 13 Government Services . .. ..... 14 Foreign Trade and Payments *. .* . * .. 15 Capital Formation 0 . 0 . 17 Employment, Earnings and Prices . ... ... , . 18 Money and Credit a . C . 0 a a. - 19 Public Finances . ., a . 21 III. THE DEVELOPMEN4T PLAN . 23 IV. PROSPECTS AND CONCLUSIONS . ........ 26 STATISTICAL APPENDIX Li /- c a i: rr i4- æ r> KENYA AGRICULTURAL AREAS AND TRANSPORT C 5 ------. 4 E T H 1 O P l A.... .: S O M A L l A HoR T H E TE R H u G Au D A o" EA 5 T E R N To, ir O A s T a avar-....r...øso e. -
The Tectonic Evolution of the Madrean Archipelago and Its Impact on the Geoecology of the Sky Islands
The Tectonic Evolution of the Madrean Archipelago and Its Impact on the Geoecology of the Sky Islands David Coblentz Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM Abstract—While the unique geographic location of the Sky Islands is well recognized as a primary factor for the elevated biodiversity of the region, its unique tectonic history is often overlooked. The mixing of tectonic environments is an important supplement to the mixing of flora and faunal regimes in contributing to the biodiversity of the Madrean Archipelago. The Sky Islands region is located near the actively deforming plate margin of the Western United States that has seen active and diverse tectonics spanning more than 300 million years, many aspects of which are preserved in the present-day geology. This tectonic history has played a fundamental role in the development and nature of the topography, bedrock geology, and soil distribution through the region that in turn are important factors for understanding the biodiversity. Consideration of the geologic and tectonic history of the Sky Islands also provides important insights into the “deep time” factors contributing to present-day biodiversity that fall outside the normal realm of human perception. in the North American Cordillera between the Sierra Madre Introduction Occidental and the Colorado Plateau – Southern Rocky The “Sky Island” region of the Madrean Archipelago (lo- Mountains (figure 1). This part of the Cordillera has been cre- cated between the northern Sierra Madre Occidental in Mexico ated by the interactions between the Pacific, North American, and the Colorado Plateau/Rocky Mountains in the Southwest- Farallon (now entirely subducted under North America) and ern United States) is an area of exceptional biodiversity and has Juan de Fuca plates and is rich in geology features, including become an important study area for geoecology, biology, and major plateaus (The Colorado Plateau), large elevated areas conservation management. -
Garlock Fault: an Intracontinental Transform Structure, Southern California
GREGORY A. DAVIS Department of Geological Sciences, University of Southern California, Los Angeles, California 90007 B. C. BURCHFIEL Department of Geology, Rice University, Houston, Texas 77001 Garlock Fault: An Intracontinental Transform Structure, Southern California ABSTRACT Sierra Nevada. Westward shifting of the north- ern block of the Garlock has probably contrib- The northeast- to east-striking Garlock fault uted to the westward bending or deflection of of southern California is a major strike-slip the San Andreas fault where the two faults fault with a left-lateral displacement of at least meet. 48 to 64 km. It is also an important physio- Many earlier workers have considered that graphic boundary since it separates along its the left-lateral Garlock fault is conjugate to length the Tehachapi-Sierra Nevada and Basin the right-lateral San Andreas fault in a regional and Range provinces of pronounced topogra- strain pattern of north-south shortening and phy to the north from the Mojave Desert east-west extension, the latter expressed in part block of more subdued topography to the as an eastward displacement of the Mojave south. Previous authors have considered the block away from the junction of the San 260-km-long fault to be terminated at its Andreas and Garlock faults. In contrast, we western and eastern ends by the northwest- regard the origin of the Garlock fault as being striking San Andreas and Death Valley fault directly related to the extensional origin of the zones, respectively. Basin and Range province in areas north of the We interpret the Garlock fault as an intra- Garlock. -
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. -
Yellowstone Plume Trigger for Basin and Range Extension, and Coeval Emplacement of the Nevada–Columbia Basin Magmatic Belt
Geosphere, published online on 17 February 2015 as doi:10.1130/GES01051.1 Cenozoic Tectonics, Magmatism, and Stratigraphy of the Snake River Plain–Yellowstone Region and AdjacentYellowstone Areas plume themed trigger issuefor Basin and Range extension Yellowstone plume trigger for Basin and Range extension, and coeval emplacement of the Nevada–Columbia Basin magmatic belt Victor E. Camp1, Kenneth L. Pierce2, and Lisa A. Morgan3 1Department of Geological Sciences, San Diego State University, San Diego, California 92182, USA 2U.S. Geological Survey, Northern Rocky Mountain Science Center, 2327 University Way, Box 2, Bozeman, Montana 59715, USA 3U.S. Geological Survey, 973 Federal Center, Box 25046, Denver, Colorado 80225-0046, USA ABSTRACT and Range. It was not the sole cause of Basin Juan de Fuca–Farallon plates, tractional forces and Range extension, but rather the catalyst applied to the base of the lithosphere, buoyancy Widespread extension began across the for extension of the Nevadaplano, which was forces associated with lithospheric density varia- northern and central Basin and Range already on the verge of regional collapse. tions, and basal normal forces associated with Province at 17–16 Ma, contemporaneous mantle upwelling and/or gravitational insta- with magmatism along the Nevada–Colum- INTRODUCTION bilities. They concluded that boundary forces bia Basin magmatic belt, a linear zone of associated with plate interaction would produce dikes and volcanic centers that extends for The Basin and Range Province is one of the neither the magnitude nor the rates of extension >1000 km, from southern Nevada to the best exposed extensional areas in the world for observed in the northern and central Basin and Columbia Basin of eastern Washington. -
Oman, Zanzibar, Their Relationship – and Our Trip
Oman, Zanzibar, Their Relationship – and Our Trip http://realhistoryww.com/world_history/ancient/Misc/True_Negros/Assorted/Oman_Zanzibar_Sultanate.htm Oman and Zanzibar are separated by 2,400 of the Indian Ocean. Oman is in the Middle East (in Asia); Zanzibar part of Africa. So why is the University of Arizona Center for Middle Eastern Studies’ 2016 Fulbright-Hays Group Project Abroad combining these two regions? Historically, the two areas have been in close contact with each other and provide an interesting case study of cross-regional relations. The curriculum-development program will explore these political, linguistic, and religious ties and will develop ways to integrate the information into elementary and secondary classes. From the 1st century CE, traders from the Arabian peninsula – as well as Persia and India – were in regular contact with Zanzibar and the East African coast; such cultural and trade relations increased by the 11th century. Political ties date from the early 1500s when both Oman and Zanzibar came under Portuguese colonial rule. Nearly 200 years later, Omanis overthrew Portuguese control and took charge of both Oman and Zanzibar. The latter became a center of Arab trade in slaves, spices (particularly cloves), and ivory. Many Arabs moved to the island, bringing with them Ibadi Islam, a very small school of Islamic thought which is the main faith of Oman and an important force in Zanzibar. By the 19th century, Zanzibar had become a center of Islamic scholarship: a contact zone between Ibadi Islam and other variants of the Muslim faith. The height of Arab association with Zanzibar occurred in 1840 when Omani ruler Sayyid Said bin Sultan al-Busaid moved his capital from Muscat, Oman, to Stone Town, Zanzibar. -
Landsliding and the Evolution of Normal Fault-Bounded Mountains
Landsliding and the Evolution of Normal Fault-Bounded Mountains Alexander L. Densmore Department of Geology Trinity College, Dublin 2 Ireland [email protected] Michael A. Ellis Center for Earthquake Research and Information University of Memphis, Memphis TN 38125 USA Robert S. Anderson Institute of Tectonics and Department of Earth Sciences University of California, Santa Cruz CA 95064 USA 1 Abstract Much of the tectonic and climatic history in high-relief regions, such as the mountains of the Basin and Range province, western U.S.A., is contained in the morphology of hillslopes, drainage networks, and other landforms that range in scale from 10-1 to 101 km. To understand how these landforms evolve, we have developed a numerical landscape evolution model that combines a detailed tectonic displacement field with a set of physically-based geomorphic rules. Bedrock landsliding, long recognized as a significant geomorphic process in mountainous topography, is for the first time explicitly included in the ruleset. In a series of numerical experiments, we generate synthetic landscapes that closely resemble mountainous topography observed in the Basin and Range. The production of realistic landscapes depends critically on the presence of bedrock landslides, and landsliding yields rates of long-term erosion that are comparable in magnitude to those of fluvial erosion. The erosive efficiency of bedrock landsliding implies that hillslopes may respond very quickly to changes in local baselevel, and that fluvial erosion is the rate-limiting process in steady state experimental landscapes. Our experiments generate power-law distributions of landslide sizes, somewhat similar to both field and laboratory observations. Thus, even a simple model of bedrock landsliding is capable of quantitatively reproducing mountainous topography and landslide distributions, and represents a significant step forward in our understanding of the evolution of normal fault-bounded ranges. -
Country Coding Units
INSTITUTE Country Coding Units v11.1 - March 2021 Copyright © University of Gothenburg, V-Dem Institute All rights reserved Suggested citation: Coppedge, Michael, John Gerring, Carl Henrik Knutsen, Staffan I. Lindberg, Jan Teorell, and Lisa Gastaldi. 2021. ”V-Dem Country Coding Units v11.1” Varieties of Democracy (V-Dem) Project. Funders: We are very grateful for our funders’ support over the years, which has made this ven- ture possible. To learn more about our funders, please visit: https://www.v-dem.net/en/about/ funders/ For questions: [email protected] 1 Contents Suggested citation: . .1 1 Notes 7 1.1 ”Country” . .7 2 Africa 9 2.1 Central Africa . .9 2.1.1 Cameroon (108) . .9 2.1.2 Central African Republic (71) . .9 2.1.3 Chad (109) . .9 2.1.4 Democratic Republic of the Congo (111) . .9 2.1.5 Equatorial Guinea (160) . .9 2.1.6 Gabon (116) . .9 2.1.7 Republic of the Congo (112) . 10 2.1.8 Sao Tome and Principe (196) . 10 2.2 East/Horn of Africa . 10 2.2.1 Burundi (69) . 10 2.2.2 Comoros (153) . 10 2.2.3 Djibouti (113) . 10 2.2.4 Eritrea (115) . 10 2.2.5 Ethiopia (38) . 10 2.2.6 Kenya (40) . 11 2.2.7 Malawi (87) . 11 2.2.8 Mauritius (180) . 11 2.2.9 Rwanda (129) . 11 2.2.10 Seychelles (199) . 11 2.2.11 Somalia (130) . 11 2.2.12 Somaliland (139) . 11 2.2.13 South Sudan (32) . 11 2.2.14 Sudan (33) . -
International and Civil War Data, 1816-1992 (Wages of War)
UK Data Archive Study Number 3441 Correlates of War Project: International and Civil War Data, 1816-1992 (Wages of War) 1 CORRELATES OF WAR PROJECT: INTERNATIONAL AND CIVIL WAR DATA, 1816-1992 (ICPSR 9905) Principal Investigators J. David Singer University of Michigan Melvin Small Wayne State University First ICPSR Release April 1994 Inter-university Consortium for Political and Social Research P.O. Box 1248 Ann Arbor, Michigan 48106 1 1 BIBLIOGRAPHIC CITATION Publications based on ICPSR data collections should acknowledge those sources by means of bibliographic citations. To ensure that such source attributions are captured for social science bibliographic utilities, citations must appear in footnotes or in the reference section of publications. The bibliographic citation for this data collection is: Singer, J. David, and Melvin Small. CORRELATES OF WAR PROJECT: INTERNATIONAL AND CIVIL WAR DATA, 1816-1992 [Computer file]. Ann Arbor, MI: J. David Singer and Melvin Small [producers], 1993. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1994. REQUEST FOR INFORMATION ON USE OF ICPSR RESOURCES To provide funding agencies with essential information about use of archival resources and to facilitate the exchange of information about ICPSR participants' research activities, users of ICPSR data are requested to send to ICPSR bibliographic citations for each completed manuscript or thesis abstract. Please indicate in a cover letter which data were used. DATA DISCLAIMER The original collector of the data, ICPSR, and the relevant funding agency bear no responsibility for uses of this collection or for interpretations or inferences based upon such uses. 1 1 DATA COLLECTION DESCRIPTION J.