Arrays and Array Methods in Global Seismology

Audience: This book will be of interest to scientists and researchers in seismology and geophysics. Reprinted from Surveys in Geophysics 30:4-5 (2009)

Arrays and Array Methods in Global Seismology

Author: Yu Jeffrey Gu

Publisher: Springer

ISBN: 9789400799387

Page: 273

View: 778

In recent years, the increased availability and fidelity of broadband seismic instruments have effectively narrowed the gap between exploration and global seismic applications. Global seismologists are now able to take advantage of high-resolution, often exploration-based, tools to examine rock properties tens to hundreds of kilometers below surface. This book reviews the key assumptions, algorithms and prospects of several important array-based methods in today’s global and regional seismic surveys. A short list of topics includes data migration, PP and SS precursors, Radon transform, mantle triplication, P-to-S and S-to-P converted waves, shear-wave splitting, high-resolution seismic tomography, and ambient-noise interferometry. Each approach is presented in a ‘cookbook’ fashion for easy comparison, implementation and critique by the general readership.

Foundations of Modern Global Seismology

We use array stations to track the direction and speed with which a wave sweeps
across the array. ... Directional information from arrays is generally quite good
and the apparent wave speed, which is the slope of the wave's travel-time curve,
can identify a wave type (P ... For a more complete review of seismic array
methods, see Rost (2002). circles for an earthquake near the coast of southern
California.

Foundations of Modern Global Seismology

Author: Charles J. Ammon

Publisher: Academic Press

ISBN: 0128165170

Page: 604

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Modern Global Seismology, Second Edition, is a complete, self-contained primer on seismology, featuring extensive coverage of all related aspects—from observational data through prediction—and emphasizing the fundamental theories and physics governing seismic waves, both natural and anthropogenic. Based on thoroughly class-tested material, the text provides a unique perspective on Earth’s large-scale internal structure and dynamic processes, particularly earthquake sources, and the application of theory to the dynamic processes of the earth’s upper layer. This insightful new edition is designed for accessibility and comprehension for graduate students entering the field. Exploration seismologists will also find it an invaluable resource on topics such as elastic-wave propagation, seismic instrumentation, and seismogram analysis. Includes more than 400 illustrations, from both recent and traditional research articles, to help readers visualize mathematical relationships, as well as boxed features to explain advanced topics Offers incisive treatments of seismic waves, waveform evaluation and modeling, and seismotectonics, as well as quantitative treatments of earthquake source mechanics and numerous examples of modern broadband seismic recordings Covers current seismic instruments and networks and demonstrates modern waveform inversion methods Includes extensive, updated references for further reading new to this edition Features reorganized chapters split into two sections, beginning with introductory content such as tectonics and seismogram analysis, and moving on to more advanced topics, including seismic wave excitation and propagation, multivariable and vector calculus, and tensor approaches Completely updated references and figures to bring the text up to date Includes all-new sections on recent advancements and to enhance examples and understanding Split into shorter chapters to allow more flexibility for instructors and easier access for researchers, and includes exercises

U S Geological Survey Circular

Many specialized arrays such as LASA and NORSAR have been deployed with
regular ... 7 ) are a way to indicate earthquake location capabilities of each array
relative to a global network of stations ( Powell , 1976 ) . ... The data for such
analysis are a direct by - product of the seismic monitoring function of networks .

U S  Geological Survey Circular

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Seismological Research Letters

We applied an agglomerative , dendrogram - based clustering algorithm , using
the maximum of the correlation function as the ... Also , if clusters were recorded
at an array , a back azimuth was estimated for each corresponding waveform
template . ... above noise levels at the more distant Borovoye ( BVAR / BRVK )
and Zalesovo ( ZALV / ZAL ) arrays ( see figure 1 ) . ... Wegrouped by the MK31
clusters for events also recorded at the Global Seismic Network ( GSN )
broadband station ...

Seismological Research Letters

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NASA Conference Publication

The functioning operating period of a global seismic network should be at least
ten years . the near and far sides and at sites ... Each regional seismic array must
consist of at least four seismometers in order to determine the four unknown ... To
obtain an adequate global data set , a minimum of four regional arrays whose
centers are located equidistant from one ... measurements of microwave radiance
may provide a means of determining lateral variations in heat flow as a function
of ...

NASA Conference Publication

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Congressional Serial Set

The original plan for a series of external seismic research arrays ringing the
Western periphery of the Soviet Union ... noise , high - frequency seismic arrays
in the Soviet Union take priority over further expenditures for an array located in
central Europe . ... sponsoring an international seismic data exchange system for
monitoring current and future international obligations to ... 1.5 million for
advanced test - site characterization techniques and enhancement of yield
estimation methods .

Congressional Serial Set

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Annali di geofisica

are role , which in the global seismic monitoring system has been currently
developed in the GSE . It may be also noted that regional seismic arrays are an
effective means of monitoring the interior of plates where seismic activity is very
low , especially in ... Statement of problem and method Nowadays the method
traditionally used for processing array data is based on the use of recordings
from vertical ...

Annali di geofisica

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Scientific and Technical Aerospace Reports

... from ancient and modern depositional environments 17 P2921 N92-26478
Using seafloor arrays to measure sediment seismoacoustic ... Aided Structural
Engineering ( CASE ) project : Application of finite element , grid generation , and
scientific visualization techniques to 2 ... for a Global Seismic Network on Mars (
NASA - CA - 188806 ) Research activities of various Norwegian seismic array
stations ...

Scientific and Technical Aerospace Reports

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Government Reports Announcements

users relative to the global satellite positioning system orbits in real - time and
near - real - time modes is made using simulated data . ... The study was initiated
to explore the latest techniques in platform self - alignment and to develop new
and novel ... Descriptors : * Seismic detection , * Seismological stations , * Data
processing , Seismic arrays , Seismometers , Rayleigh ... Identifiers : Vela
Uniform , Large aperture seismic array , Alaskan long period array , Norwegian
seismic array .

Government Reports Announcements

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Transactions Doklady of the Russian Academy of Sciences

3 A New Method for Automated Analysis of Three - Component Data from
Regional Seismic Arrays ? ... The first such array ( NORESS ) ... In view of the
results obtained in the Second Technical Experiment , arrays are accorded on
important role in the design of a global seismic monitoring system for the
enforcement of the ...

Transactions  Doklady  of the Russian Academy of Sciences

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AGSO

P - SV finite - element method enables crustal variations to be modelled and
synthetic seismograms to be produced . ... mislocation vector between array and
NEIC epicentres for a large group of events , it is possible to develop an empirical
calibration of the arrays . ... to locate smaller earthquakes , which are often
recorded by the sensitive seismic arrays , but not by other stations of the global
network .

AGSO

Author: Australian Geological Survey Organisation

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Detection Location and Identification of Seismic Events Using the Norwegian Seismic Array

The latter problem prevails even for the large aperture seismic arrays which are
characterized by a new seismic observation ... It is concluded that array
processing techniques could be adapted to ordinary station networks , requiring
coordination and ... In this way data quality and accessibility could be improved ,
but at the same time reducing the costs involved in running the global seismic
network .

Detection  Location and Identification of Seismic Events Using the Norwegian Seismic Array

Author: Hilmar Bungum

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Page: 203

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Chronique de l U G G I

I.U.G.G. chronicle International Union of Geodesy and Geophysics ... analyze an
arbitrary network of arrays and individual stations , and produce global seismic
bulletin in near - real time . ... aperture 5 - station array by applying a waveform
correlation method in different frequency bands and automatic phase identiin a
an ...

Chronique de l U G G I

Author: International Union of Geodesy and Geophysics

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Physics Briefs

International Symposium on Regional Seismic Arrays and Nuclear Test Ban Oslo
( Norway ) . ... This paper presents the basic method and mation capabilities of
the NORESS seismic array as a function of element spacing , frequency
algorithm ...

Physics Briefs

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Earth and Mineral Sciences

Global digital data will allow us to improve existing maps of lithospheric thickness
, velocity , attenuation , anisotropy , and stress ... The unifying power of this large
array lies in its power to apply a diverse variety of seismological tools to the area
being studied ... The justification for a new generation of portable seismic
instruments deployed in large arrays is very simple : the variety of seismic
methods ...

Earth and Mineral Sciences

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Earthquake Notes

APPLICATION OF SEISMIC ARRAYS FOR DETECTION, LOCATION AND
IDENTIFICATION OF SEISMIC EVENTS ... and medium sized arrays, and on the
other hand opening up for applying array processing techniques to a global
network of ...

Earthquake Notes

Author: Seismological Society of America. Eastern Section

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No. 1/2 of each vol., 1930- form the Proceedings or abstracts of proceedings of the section's annual meetings, some of which were held jointly with the Section of Seismology of the American Geophysical Union. No. for 1953-62 include Minutes of the Eastern Section meetings 25th-34th.

Individual Studies by Participants to the International Institute of Seismology and Earthquake Engineering

International Institute of Seismology and Earthquake Engineering. generation
and ... For the j - th individual , misfit function dj is defined as the average of root
mean squares of the difference between calculated C , and Co observed phase
velocities . Els C. ( T ) ... Microtremor Array Measurement The investigated area is
in Shizuoka prefecture near the coastal city of Hamaoka ( Fig 1 ) . ... 30 minutes
recording and 1 hour recording were carried out in small and large arrays
respectively .

Individual Studies by Participants to the International Institute of Seismology and Earthquake Engineering

Author: International Institute of Seismology and Earthquake Engineering

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