Banana-doughnut kernels and mantle tomography
نویسندگان
چکیده
منابع مشابه
Seismic tomography, adjoint methods, time reversal, and banana-doughnut kernels
S U M M A R Y We draw connections between seismic tomography, adjoint methods popular in climate and ocean dynamics, time-reversal imaging and finite-frequency ‘banana-doughnut’ kernels. We demonstrate that Fréchet derivatives for tomographic and (finite) source inversions may be obtained based upon just two numerical simulations for each earthquake: one calculation for the current model and a ...
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We review the resolution currently available with seismic tomography, in particular the ability of seismic waves to image mantle plumes, and discuss frequently asked questions about artifacts, interpretation and possible systematic errors. These aspects are discussed in more detail for two case histories offering different problems in the tomographic interpretation: Iceland and Hawaii. Regional...
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Estimating an accurate velocity function is one of the most critical steps in building an accurate seismic depth image of the subsurface. In areas with significant structural complexity, one-dimensional updating schemes become unstable, and more robust algorithms are needed. Reflection tomography both in the premigrated (Bishop et al., 1985) and postmigrated domains (Stork, 1992; Kosloff et al....
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[1] A lower mantle S wave triplication (Scd) has been recognized for many years and appears to be explained by the recently discovered perovskite (PV) to postperovskite (PPV) phase change. Seismic observations of Scd display (1) rapid changes in strength and timing relative to S and ScS and (2) early arrivals beneath fast lower mantle regions. While the latter feature can be explained by a Clap...
متن کاملConstruction of finite-frequency kernels using adjoint methods
This chapter contains excerpts from “Seismic tomography, adjoint methods, time reversal, and banana-doughnut kernels,” by Jeroen Tromp, Carl Tape, and Qinya Liu. My primary contribution to this study was to adapt a 2D SEM wave propagation code to construct finitefrequency kernels. In a series of numerical experiements, I illustrated the formation of finitefrequency sensitivity kernels via the i...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 2005
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.2005.02817.x