Emergence of broadband Rayleigh waves from correlations of the ambient seismic noise.
TLDR
In this paper, the authors demonstrate that coherent information about the Earth structure can be extracted from the ambient seismic noise using a cross-correlations of vertical component records of several days of seismic noise at different pairs of stations separated by distances from about one hundred to more than two thousand kilometers.Abstract:
[1] We demonstrate that the coherent information about the Earth structure can be extracted from the ambient seismic noise We compute cross-correlations of vertical component records of several days of seismic noise at different pairs of stations separated by distances from about one hundred to more than two thousand kilometers Coherent broadband dispersive wavetrains clearly emerge with group velocities similar to those predicted from the global Rayleigh-wave tomographic maps that have been constrained using ballistic surface waves Those results show that coherent Rayleigh waves can be extracted from the ambient seismic noise and that their dispersion characteristics can be measured in a broad range of periods This provides a source for new types of surface-wave measurements that can be obtained for numerous paths that could not be sampled with the ballistic waves and, therefore, can significantly improve the resolution of seismic imagesread more
Citations
More filters
Journal ArticleDOI
High-resolution surface-wave tomography from ambient seismic noise.
TL;DR: Cross-correlation of 1 month of ambient seismic noise recorded at USArray stations in California yields hundreds of short-period surface-wave group-speed measurements on interstation paths that are used to construct tomographic images of the principal geological units of California.
Journal ArticleDOI
Processing seismic ambient noise data to obtain reliable broad-band surface wave dispersion measurements
G. D. Bensen,Michael H. Ritzwoller,M. P. Barmin,Anatoli L. Levshin,Fan-Chi Lin,Morgan P. Moschetti,Nikolai M. Shapiro,Yingjie Yang +7 more
TL;DR: Proxy curves relating observed signal-to-noise ratios to average measurement uncertainties show promise to provide useful expected measurement error estimates in the absence of the long time-series needed for temporal subsetting.
Journal ArticleDOI
Surface-wave array tomography in SE Tibet from ambient seismic noise and two-station analysis: I - Phase velocity maps
TL;DR: In this paper, the authors used empirical Green's functions between pairs of seismographs to estimate velocity dispersion at relatively short periods, which can be used to resolve structures in the crust and uppermost mantle better than with traditional surface-wave tomography.
Journal ArticleDOI
Green's function representations for seismic interferometry
Kees Wapenaar,Jacob T. Fokkema +1 more
TL;DR: In this article, it was shown that the acoustic Green's function between any two points in the medium can be represented by an integral of crosscorrelations of wavefield observations at those two points.
Journal ArticleDOI
Towards forecasting volcanic eruptions using seismic noise
Florent Brenguier,Nikolai M. Shapiro,Michel Campillo,Valérie Ferrazzini,Zacharie Duputel,Olivier Coutant,Alexandre Nercessian +6 more
TL;DR: In this paper, the authors used the properties of ambient seismic noise recorded over an 18-month interval to show that changes in the interior of the Piton de la Fournaise volcano can be monitored continuously by measuring very small relative seismicvelocity perturbations, of the order of 0.05%.
References
More filters
Journal ArticleDOI
Origin of coda waves: Source, attenuation, and scattering effects
Keiiti Aki,Bernard Chouet +1 more
TL;DR: In this paper, the scaling law of earthquake source spectra between central California and western Japan was investigated and two extreme models of the wave medium that account for the observations on the coda were proposed.
Journal ArticleDOI
Long-range correlations in the diffuse seismic coda.
Michel Campillo,Anne Paul +1 more
TL;DR: This seismological example shows that diffuse waves produced by distant sources are sufficient to retrieve direct waves between two perfectly located points of observation and has potential applications in other fields.
Journal ArticleDOI
On the emergence of the Green's function in the correlations of a diffuse field
Oleg I. Lobkis,Richard L. Weaver +1 more
TL;DR: It is shown that a diffuse field is not devoid of phase information, but has a correlation function equal to the Green's function, and the cross-correlation between diffuse signals in two transducers is very nearly equal to an impulse applied to the other.
Journal ArticleDOI
Time–distance helioseismology
TL;DR: In this paper, it is shown that it is possible to extract time-distance information from temporal cross-correlations of the intensity fluctuation on the solar surface, which opens the way for seismic studies of local solar phenomena such subsurface inhomogeneities near sunspots and should help to refine global models of the internal velocity stratification.
Journal ArticleDOI
Monte-Carlo inversion for a global shear-velocity model of the crust and upper mantle
TL;DR: In this article, the authors describe a method to invert surface wave dispersion data for a model of shear velocities with uncertainties in the crust and uppermost mantle.