Full-waveform inversion (FWI) of shallow-seismic surface waves is able to reconstruct lateral variations of subsurface elastic properties. Line-source simulation for point-source data is required when applying algorithms of 2-D adjoint FWI to recorded shallow-seismic field data. The equivalent line-source response for point-source data can be obtained by convolving the waveforms with sqrt(1/t) (t: traveltime), which produces a phase shift of π/4. Subsequently an amplitude correction must be applied. In this work we recommend to scale the seismograms with sqrt(2*r*v_ph) at small receiver offsets r, where v_ph is the phase velocity, and gradually shift to applying a sqrt(1/t) time-domain taper and scaling the waveforms with r*sqrt(2) for larger receiver offsets r. We call this the hybrid transformation which is adapted for direct body and Rayleigh waves and demonstrate its outstanding performance on a 2-D heterogeneous structure. The fit of the phases as well as the amplitudes for all shot locations and components (vertical and radial) is excellent with respect to the reference line-source data. An approach for 1-D media based on Fourier–Bessel integral transformation generates strong artefacts for waves produced by 2-D structures. ... mehr

Zugehörige Institution(en) am KIT |
Geophysikalisches Institut (GPI) |

Publikationstyp |
Zeitschriftenaufsatz |

Jahr |
2014 |

Sprache |
Englisch |

Identifikator |
ISSN: 0956-540X KITopen-ID: 1000042250 |

Erschienen in |
Geophysical Journal International |

Band |
198 |

Heft |
3 |

Seiten |
1405-1418 |

Nachgewiesen in |
Web of Science Scopus |

KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft

KITopen Landing Page