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In the News (Sun 18 Aug 19)

  
 Dahlen, F.A. and Tromp, J.: Theoretical Global Seismology.
In this book, F. Dahlen and Jeroen Tromp present an advanced theoretical treatment of global seismology, describing the normal-mode, body-wave, and surface-wave methods employed in the determination of the Earth's three-dimensional internal structure and the source mechanisms of earthquakes.
These free oscillations of the Earth and the related propagating body and surface waves are routinely detected at broad-band seismographic stations around the world.
As a long-needed unification of theories in global seismology, the book will be important to graduate students and to professional seismologists, geodynamicists, and geomagnetists, as well as to astronomers who study the free oscillations of the Sun and other stars.
pup.princeton.edu /titles/6361.html   (481 words)

  
 Glossary of Geophysical Terms
A P Wave is one of two types of body waves.
Seismology is the study of earthquakes and waves generated by earthquakes and explosions.
An S Wave is one of two types of body waves.
www.geo.lsa.umich.edu /~MichSeis/QUAKEVIEW/Tutorials/glossary.html   (481 words)

  
 Seismic wave - Wikipedia, the free encyclopedia
Body waves are divided into two types: primary ( P-waves) and secondary ( S-waves }.
Because of their low frequency, they are more likely than body waves to stimulate resonance in buildings, and are therefore the most destructive type of seismic wave.
An excellent audience demonstration for seismic waves is shown in slinky seismology.
en.wikipedia.org /wiki/Seismic_wave   (481 words)

  
 What Is Seismology and What Are Seismic Waves?
The second type of body wave is the S wave or secondary wave, which is the second wave you feel in an earthquake.
The two main types of waves are body waves and surface waves.
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion.
www.geo.mtu.edu /UPSeis/waves.html   (492 words)

  
 What Is Seismology and What Are Seismic Waves?
Seismology is the study of earthquakes and seismic waves that move through and around the earth.
The second type of body wave is the S wave or secondary wave, which is the second wave you feel in an earthquake.
The two main types of waves are body waves and surface waves.
www.geo.mtu.edu /UPSeis/waves.html   (492 words)

  
 Free-ResearchPapers.com - Earth Quake Reference Files
The study of earthquakes and the waves they create is called seismology.
Waves that travel in the rocks below the surface of the earth are called body waves, and there are two types of body waves: primary, or P, waves, and secondary, or S, waves.
P waves are compression waves because the rocky material in their path moves back and forth in the same direction as the wave travels alternately compressing and expanding the rock.
www.free-researchpapers.com /dbs/b8/sff323.shtml   (492 words)

  
 What Is Seismology and What Are Seismic Waves?
The second type of body wave is the S wave or secondary wave, which is the second wave you feel in an earthquake.
The two main types of waves are body waves and surface waves.
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion.
www.geo.mtu.edu /UPSeis/waves.html   (492 words)

  
 EOSC 353 - EOS
Hooke's law for isotropic continua, elastic wave equation, reflection and refraction methods for imaging the Earth's internal structure, plane waves in an infinite medium and interaction with boundaries, body wave seismology, inversion of travel-time curves, generalized ray theory, crustal seismology, surface waves and earthquake source studies.
Reflection seismology: applications to exploration and environmental problems.
Ray theory : amplitudes, reflection / transmission coefficients
www.eos.ubc.ca /courses/eosc353/eosc353.htm   (75 words)

  
 What Is Seismology and What Are Seismic Waves?
The second type of body wave is the S wave or secondary wave, which is the second wave you feel in an earthquake.
The two main types of waves are body waves and surface waves.
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion.
www.geo.mtu.edu /UPSeis/waves.html   (492 words)

  
 Seismic wave - Wikipedia, the free encyclopedia
Seismic waves are studied by seismologists, and measured by a seismograph or seismometer.
An excellent audience demonstration for seismic waves is shown in slinky seismology.
Because of their low frequency, they are more likely than body waves to stimulate resonance in buildings, and are therefore the most destructive type of seismic wave.
en.wikipedia.org /wiki/Seismic_wave   (1829 words)

  
 Search Encyclopedia.com
wave wave, in oceanography, an oscillating movement up and down, of a body of water caused by the frictional drag of the wind, or on a larger scale, by submarine earthquakes, volcanoes, and landslides.
In seismology, waves moving though the earth are caused by the propagation of a disturbance generated by an earthquake or...
modulation modulation, in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information-bearing signal wave (the modulating wave); demodulation is the process by which the original signal is recovered from the wave produced by modulation.
www.encyclopedia.com /search.asp?target=Kamehameha+Wave&rc=10&fh=14&fr=21   (467 words)

  
 Earthquakes
Modern seismology uses P wave's first motions and the amplitudes of direct P and S waves, surface waves and waves reflected many times from the surface of the earth to understand the earthquake source (Yeats 67).
Earthquake prediction, based on the time interval between body and surface waves, is still primitive, yet is promising.
Wave motion is the way in which energy is transmitted from the earthquake source to the Earth's surface.
www.umich.edu /%7Egs265/society/earthquakes.htm   (4913 words)

  
 K3DN Feedback November 1999
No, it's not the study of "sizes." Seismology is the study of earthquake waves as they move through the Earth's interior (body waves) and along Earth's outer layer (surface waves).
Compressing and pulling on the slinky results in back-and-forth vibration in the same direction as the wave.
In view of the recent earthquake in Turkey (as well as the dozens of seismic events which occur daily), I thought his would be an appropriate topic for this month's Earth and Space Science column.
www.k3dn.org /novFB99.htm   (4913 words)

  
 Latest Updates
2005-06-13 Full Text Title: Applications of the Kirchhoff-Helmholtz integral to problems in body wave seismology
Part II: Extension of Guderley's solution for converging shock waves
2005-06-13 Full Text Title: Lagrangian averaging, nonlinear waves, and shock capturing
eprints.bo.cnr.it /indexes/updates_month.html   (4913 words)

  
 Earthquake Hazards Program: An Interview with Charles F. Richter
For deep-focus earthquakes, it has been shown that Gutenberg's results were distorted by the comparatively large loss of energy in body waves from shallow earthquakes when they pass out of and back into the crust.
Yes, without any significant contribution from me, he later worked out a version of the magnitude scale that used the measured amplitudes and periods of body waves, that is P (primary), S (secondary), and PP (P waves that are reflected at the Earth's outer surface and then continue on as P waves).
I had doubts at the time, and I still feel that the body-wave scale is not satisfactory for general use because it gives results comparable with Gutenberg's only if his procedure is closely followed.
wwwneic.cr.usgs.gov /neis/seismology/people/int_richter.html   (1855 words)

  
 iceland-lit.bib
G.}, YEAR = {1980}, TITLE = {Seismic structure of the {Icelandic crust} above layer three and the relation between body wave velocity and the alteration of the basaltic crust}, JOURNAL = {J.Geophys.}, VOLUME = {47}, PAGES = {211--220}, ANNOTE = {petrology, seismics; Flovenz} } @ARTICLE{Flov:etal85, AUTHOR = {Fl{\'o}venz, {\'O}.
and Hreinsdóttir, S. and Gudmundsson, G.}, TITLE = {{Crustal deformation measured by GPS in the South Iceland Seismic Zone due to two large earthquakes in June 2000}}, JOURNAL = {Geophys.Res.Lett.}, YEAR = {2001}, VOLUME = {28}, NUMBER = {21}, PAGES = {4031--4034}, ANNOTE = {Arnadottir, Hreinsdottir; crust, geodesy, seismology} } @ARTICLE{Arna:etal98, AUTHOR = {{\'A}rnad{\'o}ttir, {\TH}.
Seismology and helium isotopes}}, JOURNAL = {Geophys.J.Int.}, YEAR = {2001}, VOLUME = {145}, NUMBER = {3}, PAGES = {F1--F5}, ANNOTE = {seismology, geochemistry, isotopes} } @ARTICLE{FoTo89, AUTHOR = {Foulger, G. and Toomey, D. TITLE = {Structure and evolution of the {Hengill-Grensdalur} volcanic complex, {Iceland: Geology}, geophysics and seismic tomography}, JOURNAL = {J. Geophys.
www.geophysik.uni-frankfurt.de /geodyn/island/iceland-lit-bib.html   (1855 words)

  
 Ground rotational motions of the 1999 Chi-Chi, Taiwan earthquake as inferred from dense array observations
Index Terms: 7212 Seismology: Earthquake ground motions and engineering; 7209 Seismology: Earthquake dynamics and mechanics; 7203 Seismology: Body wave propagation.
Large rotational motions excited by the 1999 Chi-Chi, Taiwan earthquake are inferred from a dense acceleration array near the northern end of the rupture fault where large surface slips along the fault are observed.
It is found that in the footwall region the observed strong rotational ground motions were most probably excited by the slip of the northern rupture ending segment of the Chi-Chi earthquake fault and that its thrust slips induced a major rock motion in the radial component.
www.agu.org /pubs/crossref/2003/2002GL015157.shtml   (236 words)

  
 Configuration of subducting Philippine Sea plate and crustal structure in the central Japan region
Index Terms: 7205 Seismology: Continental crust (1242); 7203 Seismology: Body wave propagation; 7218 Seismology: Lithosphere and upper mantle; 8150 Tectonophysics: Plate boundary—general (3040).
Configuration of subducting Philippine Sea plate and crustal structure in the central Japan region
Citation: Iidaka, T. Iwasaki, T. Takeda, T. Moriya, I. Kumakawa, E. Kurashimo, T. Kawamura, F. Yamazaki, K. Koike, and G. Aoki (2003), Configuration of subducting Philippine Sea plate and crustal structure in the central Japan region, Geophys.
www.agu.org /pubs/crossref/2003/2002GL016517.shtml   (302 words)

  
 Strong ground motion and damage in the Taipei basin from the Moho reflected seismic waves during the March 31, 2002, Hualien, Taiwan earthquake
Index Terms: 7203 Seismology: Body wave propagation; 7212 Seismology: Earthquake ground motions and engineering; 7223 Seismology: Seismic hazard assessment and prediction.
Strong ground motion and damage in the Taipei basin from the Moho reflected seismic waves during the March 31, 2002, Hualien, Taiwan earthquake
Citation: Chen, K. Strong ground motion and damage in the Taipei basin from the Moho reflected seismic waves during the March 31, 2002, Hualien, Taiwan earthquake, Geophys.
www.agu.org /pubs/crossref/2003/2003GL017193.shtml   (302 words)

  
 Encyclopedia: Seismic wave
A P-wave or primary wave is one of the two types of elastic body waves (named because they travel through the body of the Earth) that are produced by earthquakes and recorded by seismometers.
Because of their low frequency, they are more likely than body waves to stimulate resonance in buildings, and are therefore the most destructive type of seismic wave.
An excellent audience demonstration for seismic waves is shown in slinky seismology.
www.nationmaster.com /encyclopedia/Seismic-wave   (1146 words)

  
 Helioseismology
The primary physics in both seismology and helioseismology are wave motions that are excited in the body's (Earth or Sun) interior and that propagate through a medium.
The science studying wave oscillations in the Sun is called helioseismology.
To identify the oscillation modes, many helioseismology experiments start with a velocity picture of the Sun, where each pixel tracks the velocity of a small area on the solar surface by fixing on the Doppler shift of a spectrum line.
soi.stanford.edu /results/heliowhat.html   (1489 words)

  
 USGS National Earthquake Information Center (NEIC): Earthquake Notification Services
Subscribers to MTALL can receive a message that contains the estimate of the seismic moment tensor for earthquakes with either a body-wave magnitude (mb) or surface-wave magnitude (MS) of 5.5 or greater.
Description: The USGS National Earthquake Information Center World Data Center for Seismology contains information, data, and links related to earthquakes and seismic activities.
Subscribers to BIGQUAKE can receive a message whenever an earthquake is reviewed by the duty geophysicist that has a magnitude of 5.5 or greater anywhere in the world or a magnitude of 4.5 or greater within the 50 US states,excluding the Aleutian Islands of Alaska.
gcmd.gsfc.nasa.gov /records/NEIC-Subscrip-00.html   (1489 words)

  
 GSO Faculty
Wolfe, C. Shen, S. Solomon, and P. Silver, Initial results from the PELENET experiment along the Hawaiian Islands: Body wave delay times and P-to-s conversions at the 410- and 660-km discontinuities, Eos Trans.
He also teaches graduate courses on geophysical data analysis and earthquake seismology.
Shen, Y., and the ICEMELT and HOTSPOT teams, Seismic evidence for a tilted mantle plume and large-scale, north-south mantle flow beneath Iceland, Eos Trans., AGU, F1241, 2000.
www.gso.uri.edu /faculty/shen.html   (514 words)

  
 Macintosh Software for Seismology
This is a really old application that draws "stick diagrams" for teleseismic body-wave phases (P,pP,sP, sS) for a given set of fault and propagation parameters.
Seismologists use similar types of calculations to estimate the depth and faulting geometry of earthquakes.
This is a utility for adding and subtracting times, computing moment tensors (Aki and Richard's (1980) convention), and computing distances and azimuths on a sphere.
eqseis.geosc.psu.edu /~cammon/HTML/MacSoftware/mac_software.html   (826 words)

  
 Beno Gutenberg, June 4, 1889—January 25, 1960 By Leon Knopoff Biographical Memoirs
On the global stage, Gutenberg and Richter wrote four monumental papers, On Seismic Waves (1934, 1935, 1936, 1939), covering the problems of travel-times for the many body waves in the Earth, amplitudes, surface waves, and deep-focus earthquakes.
Gutenberg calculated "the travel-times of waves to be reflected and refracted at the surface of the core, outside as well as inside"; the waves refracted at the core-mantle boundary are the P´ or PKP phases, and the reflected waves are the PcP phases.
Gutenberg confirmed and made precise the observations of Tams, Angenheister, and Macelwane in 1921-22, in which the velocities of propagation of surface waves were faster across the oceanic than across the continental portions of the Earth's surface (1924).
www.nap.edu /readingroom/books/biomems/bgutenberg.html   (8083 words)

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