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Seismic Energy Partition Applied to Dispersion Diagrams of Surface Waves

Description: 

Ambient seismic noise (ASN) has been used in various studies to obtain Rayleigh wave dispersion curves. The main objective of these studies is to obtain shear-wave velocity profiles and assess site effects for a given location. Different geophysical methods allow obtaining dispersion diagrams using ASN, highlighting the Spatial Autocorrelationmethod (SPAC); Frequency-Wavenumber Analysis (FK), among others. However, the high-energy bands in the dispersión diagrams are usually interpreted as the “true” phase/group velocities of modal dispersion. Misidentifying the multiple modes of Rayleigh/Love waves in layered media can reproduce an effective phase velocity dispersion curve. Several studies have attempted to mitigate the problem of identifying modes in dispersion curves that exhibit multiple modes and kissing effects in surface wave dispersion. This work applies the seismic energy partition concept in the dispersion curves, generating theoretical dispersion diagrams from the energy distribution corresponding to each mode. On the one hand, this procedure would allow an understanding of the nature of the propagation of surface waves and will support, in the dispersion diagrams, the manifestation of multimodal and kissing effects that limit the identification of the fundamental mode. On the other hand, it will make it possible to obtain an explicit relationship between the dispersion diagrams and the H/V spectral ratio with the seismic energy partition, which will facilitate obtaining complementary information for passive seismic prospecting techniques.

Session: Single-station Passive Exploration Methods: Status and Perspectives [Poster]

Type: Poster

Date: 4/18/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: José Piña-Flores

Student Presenter: No

Invited Presentation: 

Authors