Unknown
In:
Geophys. Res. Lett., Luxembourg, Deutsche Geophys. Gesellschaft, vol. 31, no. 7,
pp. 1-5, pp. L07614, (ISSN: 1340-4202)
Publication Date:
2004
Description:
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 images.
Keywords:
Rayleigh waves
;
Seismology
;
Broad-band
;
NOISE
;
Micro-tremor (seismic noise)
;
7255
;
Seismology:
;
Surface
;
waves
;
and
;
free
;
oscillations
;
7260
;
Theory
;
and
;
modeling
;
7294
;
Instruments
;
and
;
techniques
;
8180
;
Tectonophysics:
;
Tomography
;
GLR
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