Journal Pure and Applied Geophysics - Papers

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Journal Pure and Applied Geophysics - Requested papers

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The Selection of Field Acquisition Parameters
for Dispersion Images from Multichannel Surface Wave Data

Size: 0.7 MB | Format: PDF | Quality: Original preprint |
Journal: Pure and Applied Geophysics, Volume 161, Number 1, | Year: 2004 | pages: 17p. (185-201)

Abstract
The accuracy and resolution of surface wave dispersion results depend on the parameters used for acquiring data in the field. The optimized field parameters for acquiring multichannel analysis of surface wave (MASW) dispersion images can be determined if preliminary information on the phase velocity range and interface depth is available. In a case study on a fill slope in Hong Kong, the optimal acquisition parameters were first determined from a preliminary seismic survey prior to a MASW survey. Field tests using different sets of receiver distances and array lengths showed that the most consistent and useful dispersion images were obtained from the optimal acquisition parameters predicted. The inverted S-wave velocities from the dispersion curve obtained at the optimal offset distance range also agreed with those obtained by using direct refraction survey.

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Caveats in Multi-modal Inversion of Seismic Surface Wavefields

Author: A. L. Levshin, G. F. Panza | Size: 0.6 MB | Format: PDF | Quality: Original preprint | Publisher: Pure and Applied Geophysics, Volume 163, Number 7 | Year: 2006 | pages: 1215-1233 | ISSN: 1420-9136

We consider several examples demonstrating that the formal modal representation of surface wavefields often does not describe adequately observable wave parameters, such as the phase and group velocity dispersion of higher modes. The main reason for this is the existence in the medium of several waveguides or weakly coupled wavefields in the same waveguide. In such cases the separation of neighboring higher modes may be impossible, and observed dispersion curves may significantly differ from the ones predicted by the theory. From the example related to the studies of the crustal and upper mantle structure we found that the difficulty in the separation of first and second crustal higher modes can be overcome by applying a special inversion procedure. This procedure ignores the existence of a low velocity layer in the upper mantle when fitting the observable higher-mode dispersion curve to the one predicted by the model.

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Long Period Ground Motion at Bedrock Level in Delhi City from Himalayan Earthquake Scenarios

Author: Imtiyaz A. Parvez, Fabio Romanelli, Giuliano F. Panza | Size: 3.8 MB | Format: PDF | Quality: Original preprint | Publisher: Pure and Applied Geophysics, Volume 168, Issue 3-4 | Year: March 2011, | pages: 409-477

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