Download or read book Earthquake Relocations Along the Blanco Tranform Fault Zone written by Herbert E. Larsen (III.) and published by . This book was released on 1997 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismotectonics of the Explorer Region and of the Blanco Transform Fault Zone written by Jochen Braunmiller and published by . This book was released on 1998 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we present the first detailed, long-term seismotectonic studies of oceanic ridge-transform systems. The proximity of the Juan de Fuca plate to a network of broadband seismic stations in western North America provides a unique synergy of interesting tectonic targets, high seismicity, and recording capabilities. Our main tools are earthquake source parameters, determined by robust waveform modeling techniques, and precise earthquake locations, determined by joint epicenter relocation. Regional broadband data are used to invert for the source moment tensors of the frequent, moderate-sized (M ≥ 4) earthquakes; this analysis began 1994. We include Harvard centroid moment-tensors available since 1976 for larger (M ≥ 5) earthquakes. Two studies comprise the main part of this thesis. In the first, we determine the current tectonics of Explorer region offshore western Canada. Earthquake slip vector azimuths along the Pacific-Explorer boundary require an independent Explorer plate. We determine its rotation pole and provide a tectonic model for the plate's history over the last 2 Ma. Plate motion changes caused distributed deformation in the plate's southeast corner and caused a small piece in the southwest corner to transfer to the Pacific plate. Capture of the plate fragment indicates that preserved fragments not necessary represent entire microplates. In the second study, we investigate seismicity and source parameters along the Blanco Transform Fault Zone (BTFZ). The deformation style-- strike slip and normal faulting-- correlates well with observed changes in BTFZ's morphology. We infer that Blanco Ridge probably consists of two fault segments, that several parallel faults are active along BTFZ's west part, and that Cascadia Depression possibly is a short spreading center. The slip distribution along the BTFZ is highly variable, although seismicity could account for the full plate motion rate along the entire BTFZ. The final part is a short study where we locate an earthquake in the tectonically active Mendocino triple junction region offshore northern California using land and offshore data. The precise location may be useful as a master event for relocating other earthquakes.
Download or read book Precise Relative Locations for Earthquakes in the Northeast Pacific Region written by and published by . This book was released on 2015 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report that double-difference methods applied to cross-correlation measured Rayleigh wave time shifts are an effective tool to improve epicentroid locations and relative origin time shifts in remote regions. We apply these methods to seismicity offshore of southwestern Canada and the U.S. Pacific Northwest, occurring along the boundaries of the Pacific and Juan de Fuca (including the Explorer Plate and Gorda Block) Plates. The Blanco, Mendocino, Revere-Dellwood, Nootka, and Sovanco fracture zones host the majority of this seismicity, largely consisting of strike-slip earthquakes. The Explorer, Juan de Fuca, and Gorda spreading ridges join these fracture zones and host normal faulting earthquakes. Our results show that at least the moderate-magnitude activity clusters along fault strike, supporting suggestions of large variations in seismic coupling along oceanic transform faults. Our improved relative locations corroborate earlier interpretations of the internal deformation in the Explorer and Gorda Plates. North of the Explorer Plate, improved locations support models that propose northern extension of the Revere-Dellwood fault. Relocations also support interpretations that favor multiple parallel active faults along the Blanco Transform Fault Zone. Seismicity of the western half of the Blanco appears more scattered and less collinear than the eastern half, possibly related to fault maturity. We use azimuthal variations in the Rayleigh wave cross-correlation amplitude to detect and model rupture directivity for a moderate size earthquake along the eastern Blanco Fault. Lastly, the observations constrain the seismogenic zone geometry and suggest a relatively narrow seismogenic zone width of 2 to 4 km.
Download or read book Transform Plate Boundaries and Fracture Zones written by Joao C. Duarte and published by Elsevier. This book was released on 2018-09-25 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transform Plate Boundaries and Fracture Zones bridges the gap between the classic plate tectonic theory and new emerging ideas, offering an assessment of the state-of-the-art, pending questions, and future directions in the study of transform plate boundaries and fracture zones. The book includes a number of case studies and reviews on both oceanic and continental tectonic settings. Transform Plate Boundaries and Fracture Zones is a timely reference for a variety of researchers, including geophysicists, seismologists, structural geologists and tectonicists, as well as specialists in exploration geophysics and natural hazards. This book can also be used as an up-to-date reference at universities in both undergraduate and postgraduate levels. Reviews ideas and concepts about transform plate boundaries and fracture zones Includes a variety of case studies on both oceanic and continental settings Addresses innovative and provocative ideas about the activity of fracture zones and transform faults and their impacts to the human society
Download or read book Oceans 2003 written by and published by . This book was released on 2003 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanics Structure and Evolution of Fault Zones written by Yehuda Ben-Zion and published by Springer Science & Business Media. This book was released on 2009-12-30 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considerable progress has been made recently in quantifying geometrical and physical properties of fault surfaces and adjacent fractured and granulated damage zones in active faulting environments. There has also been significant progress in developing rheologies and computational frameworks that can model the dynamics of fault zone processes. This volume provides state-of-the-art theoretical and observational results on the mechanics, structure and evolution of fault zones. Subjects discussed include damage rheologies, development of instabilities, fracture and friction, dynamic rupture experiments, and analyses of earthquake and fault zone data.
Download or read book The New Madrid Fault Finders Guide written by Ray Knox and published by Care Publications. This book was released on 1995 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geologic Evidence for Triggered Slip on the Calaveras Fault During the Magnitude 7 1 Loma Prieta Earthquake of October 17 1989 written by Patrick H. McClellan and published by . This book was released on 1989 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Borrego Mountain Earthquake of April 9 1968 written by and published by . This book was released on 1972 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additional title page description: Contributions from: California Institute of Technology, Lamont-Doherty Geological Observatory of Columbia University [and] Seismological Field Survey, National Oceanic and Atmospheric Administration.
Download or read book I Seismotectonics of the San Jacinto Fault Zone and the Anza Seismic Gap II Imaging the Shallow Crust in Volcanic Areas with Earthquake Shear Waves written by Christopher O'Neill Sanders and published by . This book was released on 1989 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fault Zone Structure Determined Through the Analysis of Earthquake Arrival Times written by Alberto Michelini and published by . This book was released on 1991 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Symposium on the New Madrid Seismic Zone written by Geological Survey (U.S.) and published by . This book was released on 1984 with total page 950 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relocation of M 5 0 Northern Baja California Earthquakes Using S P Times written by Alena Lynn Leeds and published by . This book was released on 1979 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seismological Research Letters written by and published by . This book was released on 2004 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The New Madrid Earthquake written by Myron L. Fuller and published by Care Publications. This book was released on 1993-07 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an unabridged reprint of the first book and first thorough scientific work ever published on the great New Madrid earthquakes of 1811-12. The winter of 1811-12 experienced the greatest burst of seismic energy in the history of the original 48 states. Geologist, Myron Fuller, spent several years in the field between 1900-1905 scouting the New Madrid fault zone on foot and on horseback, mapping the consequences of these giant cataclysms that had so permanently and so profoundly changed the landscape of this region 90 years before. Originally published by the U.S. Geological Survey, this book is the starting point for all serious researchers on these world-class temblors. Foreword to this 1995 printing is by seismologist, David Stewart, Ph.D.
Download or read book Patterns of Slip Distribution at Depth and Stress Transfer Associated with Three Sequential Earthquakes Along the Calaveras Fault California written by Atilla Aydin and published by . This book was released on 1992 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Travel time Anomalies and Distribution of Earthquakes Along the Calaveras Fault Zone California written by Dieter Mayer-Rosa and published by . This book was released on 1973 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
