Retrieval of Moho-reflected shear wave arrivals from ambient seismic noise
نویسندگان
چکیده
S U M M A R Y Theoretical studies on ambient seismic noise (ASN) predict that complete Green’s function between seismic stations can be retrieved from cross correlation. However, only fundamental mode surface waves emerge in most studies involving real data. Here we show that Mohoreflected body wave (SmS) and its multiples can be identified with ASN for station pairs near their critical distances in the short period band (1–5 s). We also show that an uneven distribution of noise sources, such as mining activity and wind–topography interaction, can cause surface wave precursors, which mask weaker body wave phases.
منابع مشابه
Sensitivity of seismic wide-angle wave-field and first arrival times to fine scale crustal structure and Moho topography
A sensitivity study of stochastic crustal and Moho models on Moho refracted first arrivals is presented. The crustal model is a self-affine velocity structure superposed on a linear velocity gradient. The Moho is represented by a first-order discontinuity with a topography which is also self-affine. The sensitivity of both travel-time and wave-field is considered. We found that the full wave-fi...
متن کاملEvent-driven Seismic Interferometry with Ambient Seismic Noise
SUMMARY By cross-correlating recordings of ambient seismic noise, one can retrieve the subsurface reflection response. The quality of the retrieved reflections would depend on the qualities of the ambient noise. In a previous study, we cross-correlated ambient-noise data recorded in a desert area in North Africa and showed that we retrieved reflections. This was done assuming that body-wave noi...
متن کاملThree dimensional shear wave velocity structure of the crust and upper mantle beneath China from ambient noise surface wave tomography∗
We determine the three-dimensional shear wave velocity structure of the crust and upper mantle in China using Green’s functions obtained from seismic ambient noise cross-correlation. The data we use are from the China National Seismic Network, global and regional networks and PASSCAL stations in the region. We first acquire cross-correlation seismograms between all possible station pairs. We t...
متن کاملValidation of recent shear-wave velocity models in the United States with full-wave simulation
This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the [1] Interpretations of dynamic processes and the thermal and chemical structure of the Earth depend on the accuracy of Earth models. With the growing number of velocity ...
متن کاملCase Studies of Seismic Tomography and Earthquake Location in a Regional Context
We present three case studies of traveltime tomography applied to regional imaging of the earth's crust and upper mantle. The first case study investigates the imaging of Poisson's ratio using measurements of compressional and shear wave traveltimes. Inversions schemes that jointly fit both types of traveltime data and that selectively damp the compressional to shear wave velocity ratio are sho...
متن کامل