SKSandSPdKSsensitivity to two-dimensional ultralow-velocity zones
نویسندگان
چکیده
منابع مشابه
A compositional origin to ultralow-velocity zones
We analyzed vertical component short-period ScP waveforms for 26 earthquakes occurring in the Tonga-Fiji trench recorded at the Alice Springs Array in central Australia. These waveforms show strong precursory and postcursory seismic arrivals consistent with ultralow-velocity zone (ULVZ) layering beneath the Coral Sea. We used the Viterbi sparse spike detection method to measure differential tra...
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[1] We collected a new data set of 1354 broadband SPdKS waveforms sampling the western Pacific Ocean region. These data indicate that multiple ultralow-velocity zones (ULVZs) exist in this region. We compared these data to 2.5-D synthetic seismograms computed with the PSVaxi method for a suite of 517 ULVZ models. The region beneath the North and South Philippine Sea shows no evidence for ULVZ p...
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$KS waveforms recorded at distances of about 110 ø are extremely useful to constrain seismic velocity structure at the base of the mantle. $KS waves near this distance develop a complicated interference pattern with the phases SPaKS and $KP,& We report anomalous behavior of this interference in a number of recordings of deep earthquakes beneath South America from stations in Europe and Africa. ...
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We introduce a novel 2-D sonoelastographic technique for estimating local shear velocities from propagating shear wave interference patterns (termed crawling waves) in this paper. A relationship between the local crawling wave spatial phase derivatives and local shear wave velocity is derived, with phase derivatives estimated using a 2-D autocorrelation technique. Comparisons were made between ...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research
سال: 2010
ISSN: 0148-0227
DOI: 10.1029/2009jb006733