97 citations · 359 across the 13 of their papers we have counts for
14 papers
Minuscule corrections to near-surface solar internal rotation using mode-coupling
Srijan Bharati Das, Samarth G. Kashyap, Deniz Oktay +2
The observed solar oscillation spectrum is influenced by internal perturbations such as flows and structural asphericities. These features induce splitting of characteristic freque…
Full-waveform tomography reveals iron spin crossover in Earth lower mantle
Laura Cobden, Jingyi Zhuang, Wenjie Lei +3
Joint interpretation of bulk and shear wave speeds constrains the chemistry of the deep mantle. At all depths, the diversity of wave speeds cannot be explained by an isochemical ma…
Ab initio calculations of third-order elastic coefficients
Chenxing Luo, Jeroen Tromp, Renata M. Wentzcovitch
Third-order elasticity (TOE) theory is predictive of strain-induced changes in second-order elastic coefficients (SOECs) and can model elastic wave propagation in stressed media. A…
Inferring solar differential rotation through normal-mode coupling using Bayesian statistics
Samarth G. Kashyap, Srijan Bharati Das, Shravan M. Hanasoge +2
Normal-mode helioseismic data analysis uses observed solar oscillation spectra to infer perturbations in the solar interior due to global and local-scale flows and structural asphe…
Preconditioned BFGS-based Uncertainty Quantification in elastic Full Waveform Inversion
Qiancheng Liu, Stephen Beller, Wenjie Lei +2
Full Waveform Inversion (FWI) plays a vital role in reconstructing geophysical structures. The Uncertainty Quantification regarding the inversion results is equally important but h…
Sensitivity kernels for inferring Lorentz stresses from normal-mode frequency splittings in the Sun
Srijan Bharati Das, Tuneer Chakraborty, Shravan M. Hanasoge +1
Departures from standard spherically symmetric solar models, in the form of perturbations such as global and local-scale flows and structural asphericities, result in the splitting…
Harnessing the Power of Many: Extensible Toolkit for Scalable Ensemble Applications
Vivek Balasubramanian, Matteo Turilli, Weiming Hu +5
Many scientific problems require multiple distinct computational tasks to be executed in order to achieve a desired solution. We introduce the Ensemble Toolkit (EnTK) to address th…
A spectral-infinite-element solution of Poisson's equation: an application to self gravity
Hom Nath Gharti, Jeroen Tromp
We solve Poisson's equation by combining a spectral-element method with a mapped infinite-element method. We focus on problems in geostatics and geodynamics, where Earth's gravitat…
Double-difference adjoint seismic tomography
Yanhua O. Yuan, Frederik J. Simons, Jeroen Tromp
We introduce a `double-difference' method for the inversion for seismic wavespeed structure based on adjoint tomography. Differences between seismic observations and model predicti…
Anelastic sensitivity kernels with parsimonious storage for adjoint tomography and full waveform inversion
Dimitri Komatitsch, Zhinan Xie, Ebru Bozdag +4
We introduce a technique to compute exact anelastic sensitivity kernels in the time domain using parsimonious disk storage. The method is based on a reordering of the time loop of…
Full Waveform Inversion for Time-Distance Helioseismology
Shravan Hanasoge, Jeroen Tromp
Inferring interior properties of the Sun from photospheric measurements of the seismic wavefield constitutes the helioseismic inverse problem. Deviations in seismic measurements (s…
Seismic probes of solar interior magnetic structure
Shravan Hanasoge, Aaron Birch, Laurent Gizon +1
Sunspots are prominent manifestations of solar magnetoconvection and imaging their subsurface structure is an outstanding problem of wide physical importance. Travel times of seism…
Detectable seismic consequences of the interaction of a primordial black hole with Earth
Yang Luo, Shravan Hanasoge, Jeroen Tromp +1
Galaxies observed today are likely to have evolved from density perturbations in the early universe. Perturbations that exceeded some critical threshold are conjectured to have und…
The Adjoint Method Applied to Time-Distance Helioseismology
Shravan Hanasoge, Aaron Birch, Laurent Gizon +1
For a given {\it misfit function}, a specified optimality measure of a model, its gradient describes the manner in which one may alter properties of the system to march towards a s…