Q of the Earth: Global, Regional, and Laboratory StudiesBrian J. Mitchell, Barbara Romanowicz Variations in seismic Q are sensitive to a much greater extent than are seismic velocity variations on factors such as temperature, fluid content, and the movement of solid state defects in the earth. For that reason an understanding of Q and its variation with position in the earth and with time should provide information in earth's tectonic evolution, as well as on aspects of its internal structure. Progress in understanding Q has suffered from difficulty in obtaining reliable amplitude data at global and temporary stations. Moreover, laboratory determinations of Q, until recently, were most often made at frequencies much higher than those measured by seismologists for waves propagating through the earth. Recent advances in seismic station distribution and quality, as well as in methodology at both high and low fequencies, have greatly improved the quality of observational data available to seismologists from global stations. Concurrent advances have been made in measuring Q using laboratory samples at frequencies that pertain to the earth and in theoretical understanding of seismic wave attenuation. Papers of this volume present new information on Q in the earth from several perspectives: methodology, results from global and regional observations of both body and surface waves, laboratory measurements, and theoretical understanding. The editors believe that we have reached a new threshold in Q studies and that advances in data quality and methodology will spur increased interest in this difficult, but interesting field. |
Contents
II | 239 |
V | 257 |
VIII | 273 |
X | 311 |
XI | 345 |
XII | 377 |
XVI | 399 |
XVIII | 419 |
XXVI | 539 |
XXVII | 563 |
XXX | 587 |
XXXIII | 613 |
XXXIV | 639 |
XXXVII | 655 |
XXXVIII | 665 |
XLI | 685 |
Other editions - View all
Q of the Earth: Global, Regional, and Laboratory Studies Barbara Romanowicz,Brian J. Mitchell Limited preview - 2012 |
Q of the Earth: Global, Regional, and Laboratory Studies Barbara Romanowicz,Brian J Mitchell No preview available - 1999 |
Common terms and phrases
amplitude anelastic aplite Arabian Peninsula attenuation attenuation structure Basin beneath BOCO body waves broadband Bull Cajon Pass Cape Sorell Cape Sorell quartzite coda waves computed confining pressure crack crust crustal Delegate aplite Earth Planet earthquakes effect elastic energy errors estimates frequency band frequency dependence function Geophys high frequency hypocentral increase inversion Iranian Plateaus kinks km depth km/s Kopet Dagh lapse time window lateral variations layer Lg coda Q lithosphere long-period low Q LPAZ measurements melting zones method MITCHELL observed obtained parameters partial melt paths peridotite phase Plateau plotted propagation Q model Q values Quartz quartzite range recorded region rocks ROMANOWICZ S-wave scattering sediments seismic wave seismograms Seismol shear modulus short-period spectral ratio stations subduction surface waves technique tectonically active teleseismic temperature thermal tomographic upper mantle velocity model volcanic wave velocities waveforms