Advances In Ocean Bottom Seismology PDF Download
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Author | : Francisco Javier Nuñez-Cornu |
Publisher | : Frontiers Media SA |
Total Pages | : 199 |
Release | : 2023-03-27 |
Genre | : Science |
ISBN | : 2889749436 |
Download Advances in ocean bottom seismology Book in PDF, ePub and Kindle
Author | : LeRoy M. Dorman |
Publisher | : |
Total Pages | : 158 |
Release | : 1980 |
Genre | : Microseisms |
ISBN | : |
Download Seismic Detection and Discrimination Using Ocean-bottom Seismographs Book in PDF, ePub and Kindle
Research progress on seismic detection and discrimination using ocean-bottom seismographs (OBS's) is outlined. During this first year of DARPA contract work, our investigations have been focused primarily on using existing OBS data to address the problem of sea-floor seismic noise and to constrain models of the near-bottom seismic environment. We have completed noise studies at six of our previously occupied OBS sites. The noise levels of typical amplitude spectra roll off rapidly out to 2-4 Hz and much less rapidly beyond 4 Hz. At frequencies above 4 Hz, the noise levels are low, typically a few nanometers/Hz1/2 or less and comparable to good land-based stations. Several correlations between noise levels and other parameters, such as sediment thickness, distance from the continental margin and sea state, are discussed and used to constrain possible noise mechanisms. We hypothesize that the dominant mechanism of high-frequency (>2 Hz) noise generation at most of the sites examined thus far is of local oceanographic origin, exciting acoustic modes in the water column which couple to Stoneley modes at the sediment-water interface and waveguide modes within the sediment column. This hypothesis is supported by the analysis of noise data from two OBS arrays, which shows that the noise coherence is very low for pairs of sensors separated by as little as 200 m. We also outline some of the conclusions relevant to the seismic noise problem deduced by us from the data collected during the Lopez Island intercalibration experiment.
Author | : Michael Beer |
Publisher | : Springer |
Total Pages | : 3953 |
Release | : 2016-01-30 |
Genre | : Technology & Engineering |
ISBN | : 9783642353437 |
Download Encyclopedia of Earthquake Engineering Book in PDF, ePub and Kindle
The Encyclopedia of Earthquake Engineering is designed to be the authoritative and comprehensive reference covering all major aspects of the science of earthquake engineering, specifically focusing on the interaction between earthquakes and infrastructure. The encyclopedia comprises approximately 300 contributions. Since earthquake engineering deals with the interaction between earthquake disturbances and the built infrastructure, the emphasis is on basic design processes important to both non-specialists and engineers so that readers become suitably well informed without needing to deal with the details of specialist understanding. The encyclopedia’s content provides technically-inclined and informed readers about the ways in which earthquakes can affect our infrastructure and how engineers would go about designing against, mitigating and remediating these effects. The coverage ranges from buildings, foundations, underground construction, lifelines and bridges, roads, embankments and slopes. The encyclopedia also aims to provide cross-disciplinary and cross-domain information to domain-experts. This is the first single reference encyclopedia of this breadth and scope that brings together the science, engineering and technological aspects of earthquakes and structures.
Author | : Junzo Kasahara |
Publisher | : |
Total Pages | : 108 |
Release | : 1976 |
Genre | : Marine geophysics |
ISBN | : |
Download Ocean Bottom Seismometer Study of the Kuril Trench Area Book in PDF, ePub and Kindle
An ocean bottom seismograph was deployed on the seaward side of the Kuril Trench off Hokkaido, Japan, in 5460 m of water, in August 1975 during the joint Soviet-American Tsunami Expedition. During the seven-day record, S-P times were distributed in three groups: 19-24 sec, corresponding to aftershocks of the 10 June and 13 June 1975 earthquakes southeast of Nemuro, Japan and to earthquakes east of Sanriku, Japan; approximately 30 sec, from south of Erimo Peninsula, Hokkaido; and approximately 100 sec, from the Izu-Bonin Islands. Seven earthquakes, with hypocenters well determined by the land seismic net, are studied in detail. A shallow focus earthquake yields typical oceanic mantle velocities shallower than 50 km in the slab which dips under the Japanese archipelago. However, deeper focus earthquakes reveal anomalously high velocities averaged over the upper 230 km, in agreement with the models of Utsu and Oliver and Isacks. Two deep earthquakes, whose paths lie in the Pacific Ocean asthenosphere, suggest a velocity 3% lower than that predicted by Jeffreys-Bullen, in agreement with the above models. Spectral analysis of S arrivals suggests Q sub s values of 1000-1500 for nearby earthquakes and 4000-6000 for longer-distance earthquakes, implying an unusual attenuation mechanism for long travel paths, which enhances the high frequencies.
Author | : J. D. Duschenes |
Publisher | : |
Total Pages | : |
Release | : 1983 |
Genre | : |
ISBN | : |
Download Aspects of Ocean Bottom Seismology Book in PDF, ePub and Kindle
Author | : G. M. Purdy |
Publisher | : |
Total Pages | : |
Release | : 1991 |
Genre | : Mid-ocean ridges |
ISBN | : |
Download Ocean Bottom Seismology Book in PDF, ePub and Kindle
Author | : Hamish Wilson |
Publisher | : Cambridge University Press |
Total Pages | : 357 |
Release | : 2021-12-16 |
Genre | : Business & Economics |
ISBN | : 1108842887 |
Download Integration of Geophysical Technologies in the Petroleum Industry Book in PDF, ePub and Kindle
A review of geophysical technologies, how they should be deployed and integrated for improved petroleum exploration and production.
Author | : Jack Ertle Oliver |
Publisher | : |
Total Pages | : 26 |
Release | : 1963 |
Genre | : |
ISBN | : |
Download Ocean-bottom Seismology Book in PDF, ePub and Kindle
Author | : Ray Abma |
Publisher | : SEG Books |
Total Pages | : 220 |
Release | : 2020-12-31 |
Genre | : Science |
ISBN | : 1560803789 |
Download Simultaneous Source Seismic Acquisition Book in PDF, ePub and Kindle
This book introduces simultaneous source technology and helps those who practice it succeed. Although the book does not include all developments, which would have entailed a much longer treatise, this work is written through the lens of decades of experiences and allows readers to understand the development of independent simultaneous sourcing. The relationships between data acquisition and data processing are discussed because never before have they been so intertwined as in this area. In addition to describing the underlying technologies, this book also is a user-guide which discusses survey design and acquisition and decribes the sensitivities of the processing algorithms which can allow simultaneous source technology to succeed. The audience for this book includes acquisition and processing geophysicists who will work with these data as well as those who require only an overview of the state of the art; and, even though they may not need the full technical details, they may want to know the limitations and advantages of using simultaneous sources.
Author | : Tatsuhiko Saito |
Publisher | : Springer |
Total Pages | : 265 |
Release | : 2019-01-23 |
Genre | : Science |
ISBN | : 4431568506 |
Download Tsunami Generation and Propagation Book in PDF, ePub and Kindle
This book introduces a framework of tsunami modelling from generation to propagation, aimed at application to the new observation started in Japan after the devastating tsunami of the 2011 Tohoku-Oki earthquake. About 150 seismic and tsunami sensors were deployed in a wide region off the Pacific coast of eastern Japan in order to catch tsunami generation inside the focal area, which makes a clear departure from conventional observations that detect tsunamis far from the source region. In order to exploit the full potential of this new observation system, it is not enough to model tsunami generation simply by static sea-bottom deformation caused by an earthquake. This book explains dynamic tsunami generation and sea-bottom deformation by kinematic earthquake faulting, in which seismic and acoustic waves are also included in addition to static sea-bottom deformation. It then systematically derives basic tsunami equations from the fundamental equations of motions. The author also illustrates the details of numerical schemes and their applications to tsunami records, making sound linkages among these topics to naturally understand how a tsunami is physically or mathematically described. This book will be a comprehensive guide for graduate students and young researchers to start their research activities smoothly.