Download or read book Submarine Geomorphology of the Cascadia Accretionary Prism written by Brian Garland McAdoo and published by . This book was released on 1999 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Submarine Geomorphology of Eastern Ross Sea and Sulzberger Bay Antarctica written by Larry K. Lepley and published by . This book was released on 1966 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cascadia Subduction Zone written by LaVerne D. Kulm and published by . This book was released on 1994 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cascadia Subduction Zone written by LaVerne D. Kulm and published by . This book was released on 1990 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Submarine Slope Systems written by David Mark Hodgson and published by Geological Society of London. This book was released on 2005 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Submarine slopes provide the critical link between shallow-water and deep-water sedimentary environments. They accumulate a sensitive record of sediment supply, accommodation creation/destruction, and tectonic processes during basin filling. There is a complex stratigraphic response to the interplay between parameters that control the evolution of submarine slope systems, e.g. slope gradient, topographic complexity, sediment flux and calibre, base-level change, tectonic setting, and post-depositional sediment remobilization processes. The increased understanding of submarine slope systems has been driven partly by the discovery of large hydrocarbon fields in morphologically complex slope settings, such as the Gulf of Mexico and offshore West Africa, and has led to detailed case studies and improved generic models for their evolution. This volume brings together research papers from modern, outcrop and subsurface settings to highlight these recent advances in understanding of the stratigraphic evolution of submarine slope systems.
Download or read book Investigating Plate Boundaries Through New High Resolution Bathymetry and Seismic Data 2 Case Studies from the Cascadia Subduction Zone and San Andreas Fault written by Jeffrey Watson Beeson and published by . This book was released on 2016 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contiential margins on plate boundaries are complex systems with morphologies and characteristics dictated by the interplay of sediment deposition and erosion, tectonic faulting, folding, and strong ground motion generating mass wasting events. With ever increasing advances in high-resolution remote sensing techniques these systems are increasingly becoming illuminated. A ~120 km offshore portion of the northern San Andreas Fault (SAF) between Point Arena and Point Delgada was mapped using closely spaced seismic-reflection profiles, high-resolution multibeam bathymetry and marine magnetics data. This new dataset documents SAF location and continuity, associated tectonic geomorphology, shallow stratigraphy and deformation. Variable deformation patterns in the generally narrow (~1-km-wide) fault zone are largely associated with fault trend, and with transtensional and transpressional fault bends. We divide this unique transtensional portion of the offshore SAF into six sections along and adjacent to the SAF based on fault trend, deformation styles, seismic stratigraphy, and seafloor bathymetry. This southern region of the SAF includes a 10-km-long zone characterized by two active, parallel fault strands in which the SAF is evolving into a straighter orientation via migrating fault releasing and restraining bends. The SAF in the northern region of the survey area passes through two acute fault bends (~9° (right), and ~8° (left)), resulting in both an asymmetric “Lazy Z” sedimentary basin (“Noyo Basin”) and an uplifted rocky shoal (“Tolo Bank”). Noyo Basin subsidence and tilt rates, as well as SAF lateral slip rates, were determined based on seismic-stratigraphic sequences and unconformities correlated with the previous 4 major Quaternary sea-level lowstands. Progressively steeper erosional surfaces record basin tilting of ~0.6° per 100,000 years. Migration of the basin depocenter indicates a lateral slip rate on the San Andreas Fault of 10 to 19 mm/yr for the past 350,000 years. Data collected west of the SAF on the south flank of Cape Mendocino rule out the previously postulated presence of an offshore fault strand that connects the SAF with the Mendocino Triple Junction. Instead, the SAF passes on land at Point Delgada, where the SAF plate boundary transitions to the Kings Range thrust. Utilizing new high resolution multibeam bathymetric data, chirp sub-bottom and multichannel seismic reflection profiles, we identify and describe submarine channels, submarine landslides, and three “new” erosional features on the toe of the Cascadia accretionary wedge near Willapa Canyon, offshore Washington, USA. Bathymetric data was compiled from the Cascadia Open-Access Seismic Transects (COAST) cruise and from the site survey cruise for the Cascadia Initiative. This new high-resolution dataset has illuminated geomorphic features that suggest this section of the margin underwent radical erosion in the latest-Pleistocene. Three “new” and peculiar features were imaged that superficially resemble slope failures of the frontal thrust, but are distinguished from such failures by 1) incision of the crest of the frontal thrust and anticlinal ridge, and piggyback basin; 2) they have floors below the level of the abyssal plain, and have excavated deeply into the frontal anticline 3) The features are connected to the main Willapa Channel by inactive paleo channels. The features were likely formed during the latest Pleistocene based on post event deposition, cross-cutting by the modern Juan de Fuca and Willapa Channel levees, and post- event slip on the frontal thrust of the Cascadia accretionary prism. Based on morphology, dissimilarity with other submarine features on the Cascadia and other margins, and available age constraints, we infer that these features were most likely formed by massive turbidity currents associated with the glacial lake outpourings in the Pacific Northwest known as the Missoula floods.
Download or read book Submarine Geology written by Francis Parker Shepard and published by HarperCollins Publishers. This book was released on 1973 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Thermal and Fluid Environment of the Cascadia Subduction Zone Southern Washington State written by Marie Suzanne Salmi and published by . This book was released on 2018 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Subduction zones are areas of tectonic plate collision that produce associated earthquakes and destructive tsunamis and, in addition, provide a link between the atmosphere and ocean. Mapping the thermal and fluid circulation of an active subduction zone can advance our understanding of subduction zone dynamics and fluid budgets, important in understanding global chemical fluxes and the carbon cycle. By exploring the intertwined nature of both the thermal and fluid environment, a more complete picture of the governing processes can be established. The overarching goal of this thesis is to map the thermal and fluid environment within the Cascadia Subduction zone offshore Southern Washington State. Eleven recently collected multi-channel seismic (MCS) profiles from the 2012 Cascadia Open-Access Seismic Transect (COAST) experiment offshore Washington State were used to characterize the distribution of bottom simulating reflectors (BSRs) from seaward of the deformation front onto the continental shelf of the Cascadia Subduction Zone. From these MCS profiles, we generated a 3-D view of the Cascadia margin thermal structure by interpreting 40,232 individual BSR data points in terms of temperature and heat flow. Localized differences between BSR heat flow and numerical models reflect an estimated regional mean upward fluid flow of 0.53 cm yr−1 for the survey area, with localized fluid flow approaching a maximum of 3.8 cm yr−1. At the deformation front, the incoming oceanic sediment/crust interface temperatures vary between 164°C to 179°C, indicating the up-dip limit of the Cascadia seismogenic zone. Seafloor heat flow data provides valuable insight into seafloor and subseafloor fluid and geological processes. Thus, understanding the uncertainties associated with heat flow instruments is essential to the interpretation of acquired data. While there have been studies of various instruments’ ability to accurately capture the necessary elements of a heat flow measurement, a need remains to examine how well individual sensors perform in-situ and to make quantitative comparisons between different instruments and their corresponding methodologies. Four different heat flow instruments were compared: the Violin-bow Probe, Alvin Probe, Thermal Blanket, and a modified Multi-core system, in terms of individual instrument uncertainty and the accuracy of each instrument in estimating the local heat flow. On an east-west profile of the Cascadia accretionary prism, a total of 251 heat flow measurements over water depths from 550 to 2600 meters captured a wide range of seafloor thermal environments. The deployment chronology illuminated large differences in measured temperature profiles due to variable near bottom water temperatures that propagated into the sediment column. While near seafloor water temperature variability generally decreases with water depth, bathymetry and localized oceanic currents are also important because even sites at similar depth may be exposed to vastly different seafloor thermal environments that impact all instrument types. The collected seafloor heat flow measurements were co-located with the COAST MCS profiles that run perpendicular to the megathrust fault strike, providing additional contextual data in the form of BSR heat flow and internal geological structure. Additional context comes from in-situ thermal conductivity measurements, multibeam derived backscatter, acoustic imaged bubble streams, and ROV video of carbonate deposits and pockmarks. Fluid emission sites differ across-strike from the actively deforming and faulted accretionary toe, with highly variable and shallow sourced fluid, to long-lived point sources of methane gas from deeper within the accretionary wedge. These surface heat flow measurements throughout the survey proved useful for detecting fluid emissions from the seafloor sediment, especially in the absence of methane gas and carbonate.
Download or read book Neotectonics of the Accretionary Wedge and Adjacent Abyssal Plain Off Oregon and Washington written by LaVerne D. Kulm and published by . This book was released on 1990* with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ONR STRATAFORM Proposal written by D. Orange and published by . This book was released on 1996 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Submarine Geomorphology and Geology of the Mississippi River Delta Front written by Peter K. Trabant and published by . This book was released on 1978 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Submarine Geomorphology written by Aaron Micallef and published by Springer. This book was released on 2017-07-18 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book on the current state of knowledge of submarine geomorphology aims to achieve the goals of the Submarine Geomorphology working group, set up in 2013, by establishing submarine geomorphology as a field of research, disseminating its concepts and techniques among earth scientists and professionals, and encouraging students to develop their skills and knowledge in this field. Editors have invited 30 experts from around the world to contribute chapters to this book, which is divided into 4 sections – (i) Introduction & history, (ii) Data & methods, (ii) Submarine landforms & processes and (iv) Conclusions & future directions. Each chapter provides a review of a topic, establishes the state-of-the-art, identifies the key research questions that need to be addressed, and delineates a strategy on how to achieve this. Submarine geomorphology is a priority for many research institutions, government authorities and industries globally. The book is useful for undergraduate and graduate students, and professionals with limited training in this field.
Download or read book Subaqueous Mass Movements and Their Consequences written by D.G. Lintern and published by Geological Society of London. This book was released on 2019-09-25 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: The challenges facing submarine mass movement researchers and engineers are plentiful and exciting. This book follows several high-profile submarine landslide disasters that have reached the world’s attention over the past few years. For decades, researchers have been mapping the world’s mass movements. Their significant impacts on the Earth by distributing sediment on phenomenal scales is undeniable. Their importance in the origins of buried resources has long been understood. Their hazard potential ranges from damaging to apocalyptic, frequently damaging local infrastructure and sometimes devastating whole coastlines. Moving beyond mapping advances, the subaqueous mass movement scientists and practitioners are now also focussed on assessing the consequences of mass movements, and the measurement and modelling of events, hazard analysis and mitigation. Many state-of-the-art examples are provided in this book, which is produced under the auspices of the United Nations Educational, Scientific and Cultural Organisation Program S4SLIDE (Significance of Modern and Ancient Submarine Slope LandSLIDEs).
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1999 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1999 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Gas Hydrate in Oceanic and Permafrost Environments written by M.D. Max and published by Springer Science & Business Media. This book was released on 2003-05-31 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book published on the emerging research field of naturally occurring gas hydrates (focusing on methane hydrate) that is not primarily a physical chemistry textbook. This book is designed as a broad introduction to the field of hydrate science, demonstrating the significance of the hydrate cycle to energy resource potential, seafloor stability, and global climate and climate change, along with other issues. The best known hydrate localities are described, as are research and laboratory methods and results. The book consists of chapters grouped in related themes that present up-to-date information on methane hydrate. Each of the contributing authors is expert in hydrate science and most have been carrying out research in hydrate for a considerable time. Audience: This book will be an important source of information for marine geologists, geophysicists, geochemists, and petroleum geologists and regulators. It is also intended as a graduate-level textbook.
Download or read book New Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1995 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
