1 / 9

Advancements in 3D Reconstructive Techniques for Imaging Subsurface Velocities

Explore the latest methodological improvements for 3D reconstructions, including noise correlation techniques, dispersion curve estimation, and comparisons between SPAC/FK methods. Learn about the performance and limits of these techniques and their applications for subsurface shear-wave velocity imaging.

cassandra-wooten
Télécharger la présentation

Advancements in 3D Reconstructive Techniques for Imaging Subsurface Velocities

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. WP-1-1: Methodological improvements for 3D reconstructions Contributors: Pierre Gouédard, Philippe Roux, Seiji Tsuno, Marc Wathelet

  2. What has been done/initiated ? • ESG2006 noise blind test • Estimation of dispersion curves is OK • Interpretation of mode branches and inversion of Vs profiles are critical issues • Comparison between SPAC/FK et noise correlation techniques • => performance and limits of these “competing” approaches • => what kind of “correlation technique and array layout” to use • for imaging subsurface shear-wave velocity • MASW measurements for getting information on the shallow layers (Vs, Qs) • high frequency technique (10-80 Hz) • complementary to noise array technique

  3. Comparison between SPAC/FK and noise correlation

  4. resolution limit D ~ max aliasing limit 2d ~ min

  5. reliable resolution limit D ~ max Mapping resolution and aliasing limits into f-c domain aliasing limit 2d ~ min

  6. Isotropic noise directional noise

  7. HRFK CORR

  8. Comparison SPAC/FK and noise correlation • Similar performance at low frequency (controlled by array aperture) • Better performance of noise correlation at high frequency (although a • similar array layout, effective spatial aliasing is different) • Noise correlation allows estimating both Rayleigh and Love waves • dispersion curves (also for SPAC3C but not so straightforwardly for FK • techniques) • Future studies on performance of correlation techniques • application of correlation to 2D structures (array aperture  frequency • range  2D site)

More Related