Joint Inversion of Multimode Love Wave Dispersion Curves for Accurately Appraising of Shear Wave Velocity Reversal Profile

Hamimu, La; Nordin, Mohd Nawawi Mohd; Safani, Jamhir; Yahya, A. K.; Alam, Shah

doi:10.1063/1.3469648

Cited by 1 publication

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“…In general, the discourse surrounding anisotropy primarily focuses on scenarios involving the propagation of waves, particularly in cases where the anisotropy present within the rock is weak. The seismic velocity of P-wave for weak anisotropy is formulated as [16] V P (θ)=α 0 (1+δ sin 2 θ cos 2 θ +ε sin 4 θ ) (8) where δ, ε, and γ are the anisotropy parameters (Thomsen parameters),  is the phase angle (0 0 is measured from the vertical direction). The 0 indicates the P-wave velocity at =0.…”

Section: Seismic Anisotropic Equationmentioning

confidence: 99%

“…Over the past few decades, the author has prioritized the implementation of MATLAB programming in conducting geophysical computations. We have been focused and committed to using the MATLAB programming language for modelling vertical electrical sounding (VES) [7] and calculating the multimode Love wave dispersion curves [8]. In this paper, our efforts focus to image the near-surface velocity structure based on the seismic refraction delay time tomography.…”

Section: Introductionmentioning

confidence: 99%

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Computation and Modelling of Seismic Refraction Tomography for Anisotropic Medium Based on Pseudo Bending Method

Hamimu,

Haraty,

Rubaiyn

et al. 2024

J. Phys.: Conf. Ser.

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Seismic refraction tomography is one of the imaging techniques in geophysical methods used to remodel the near-surface velocity layer structure of the Earth. In this study, we carried out a new computational approach and modelling of seismic refraction tomography using the pseudo-bending method. The true model of the near-surface is designed to be anisotropic medium which is having a low velocity anomaly distribution. This anomaly is constructed in such a way as to be similar to a model of liquid waste away spreading, which exhibits seismic velocities ranging from 1600 m/s to 1800 m/s. Based on our computations and numerical modelling results, it was found that the ray tracing path using pseudo-bending method displays an asymmetrical trajectory when the positions of the source and geophone are exchanged. Altering the shooting configuration from direct shoot (DS) to reversed shoot (RS) also reveals a significant difference in travel time values. The results of delay time tomography inversion, which represents the difference between travel times in the true model and the initial model using the SIRT method, indicate the presence of a low velocity anomaly that can be interpreted as the distribution of liquid waste.

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Section: Seismic Anisotropic Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%