Measuring finite-frequency body-wave amplitudes and traveltimes
نویسندگان
چکیده
منابع مشابه
An adaptive finite-difference method for traveltimes and amplitudes
The point-source traveltime field has an upwind singularity at the source point. Consequently, all formally high-order, finite-difference eikonal solvers exhibit firstorder convergence and relatively large errors. Adaptive upwind finite-difference methods based on high-order Weighted Essentially NonOscillatory (WENO) RungeKutta difference schemes for the paraxial eikonal equation overcome this ...
متن کاملAn Adaptive Finite-Di erence Method for Traveltimes and Amplitudes
The point source traveltime eld has an upwind singularity at the source point. Consequently, all formally high-order nite-diierence eikonal solvers exhibit rst-order convergence and relatively large errors. Adaptive upwind nite-diierence methods based on high-order Weighted Essentially NonOscillatory (WENO) Runge-Kutta diierence schemes for the paraxial eikonal equation overcome this diiculty. ...
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One difficulty in full waveform inversion is the requirement for an accurate initial model, which if not satisfied, can result in cycle skipping and convergence to local minima. Similarly, in least-squares migration, errors in the background model can lead to an incoherent, defocused image. These difficulties can be attributed in part to the fact that the data residual, the difference between s...
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High frequency asymptotic approximation of the acoustic Green's function leads to eecient modeling and migration methods for primaries only reeection seismograms. A volume (as opposed to interface) oriented description of reeectivity allows symmetry between modeling and migration. With proper selection of amplitudes and dis-cretization, the migration and modeling operations are mathematically a...
متن کاملFrequency-dependent effects on global S-wave traveltimes: wavefront-healing, scattering and attenuation
S U M M A R Y We present a globally distributed data set of ∼400 000 frequency-dependent SH-wave traveltimes. An automated technique is used to measure teleseismic S, ScS and SS traveltimes at several periods ranging from 10 to 51 s. The targeted seismic phases are first extracted from the observed and synthetic seismograms using an automated time window algorithm. Traveltimes are then measured...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 2006
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.2006.03116.x