Seismic and gravitational studies of melting in the mantle's thermal boundary layers

Ark, Van; Emily, M

doi:10.1575/1912/1730

Cited by 1 publication

(2 citation statements)

References 185 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is simple to apply to phases characterized by energy concentrated in a narrow range of horizontal slowness, p, but impractical to include across the entire time length of a seismogram, which may consist of many phases having different slownesses. When this spreading correction is applied to individual phases synthesized by the numerical method and compared to the individual phases synthesized by the asymptotically approximate method, the waveforms can be overlain without mismatch to within the accuracy of trace line widths[ Van Ark , 2007]. …”

Section: Forward Modelingmentioning

confidence: 99%

“…Global seismic wave propagation through 1‐D and 2‐D ULVZs is modeled using a cylindrical pseudospectral algorithm [ Cormier , 2000; Van Ark , 2007]. The pseudospectral method is distinguished by its use of Fourier transforms to estimate the spatial derivatives in the elastic equations and the equations of motion as the wavefield is stepped forward through time.…”

Section: Forward Modelingmentioning

confidence: 99%

See 1 more Smart Citation

SKS and SPdKS sensitivity to two‐dimensional ultralow‐velocity zones

Rondenay¹,

Cormier²,

Ark³

2010

J. Geophys. Res.

View full text Add to dashboard Cite

[1] Seismic wave propagation through two-dimensional core-mantle boundary (CMB) ultralow-velocity zones (ULVZs) is modeled using a global pseudospectral algorithm. Seismograms are synthesized for several types of ULVZ models to investigate the effect of these structures on SKS and SPdKS phases. One-dimensional models and two-dimensional models with different, quasi-1-D velocity structures on the source and receiver sides of the CMB provide a baseline for comparison with other 2-D models. Models with finite length ULVZs are used to test the sensitivity of the SPdKS travel time and waveform to different portions of the P diffracted wave path. This test shows that SPdKS waves are only sensitive to ULVZs with lengths >100 km. Our results give three tools for identifying and characterizing 2-D ULVZ structures. First, dual SPdKS pulses indicate exposure to at least two separate CMB velocity structures, either different source and receiver-side CMB velocities or different adjacent velocity regions for which P diff inception occurs outside of and propagates into a ULVZ. Second, high-amplitude SKS precursors indicate a very "strong" (i.e., thick and/or large velocity perturbations) ULVZ. Hence, the absence of SKS precursors in most previous ULVZ studies indicates that very strong, sharp ULVZs are not common. Third, mean SPdKS delays relative to PREM constrain the minimum ULVZ strength and length combinations required to produce a given travel time delay.Citation: Rondenay, S., V. F. Cormier, and E. M. Van Ark (2010), SKS and SPdKS sensitivity to two-dimensional ultralowvelocity zones,

show abstract

Section: Forward Modelingmentioning

confidence: 99%

Section: Forward Modelingmentioning

confidence: 99%