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Microseismic P-Wave Travel Time Computation and 3D Localization Based on a 3D High-Order Fast Marching Method
Yijia Li1, Jing Wang1, Zhengfang Wang1
1School of Control Science and Engineering, Shandong University, Jinan 250061, China.
Sensors (Basel, Switzerland)
|September 10, 2021
Summary
This study introduces a 3D high-order fast marching method (3D_H_FMM) to accurately calculate P-wave travel times. This improved method enhances the precision of 3D microseismic source localization.
Area of Science:
- Geophysics
- Seismology
- Computational Science
Background:
- Inaccurate travel time computations in 3D space hinder precise microseismic source localization.
- Existing methods struggle with diagonal wave propagation, impacting accuracy.
Purpose of the Study:
- To develop an accurate method for calculating P-wave travel times in 3D space.
- To improve the accuracy of 3D microseismic source localization.
Main Methods:
- Developed a 3D high-order fast marching method (3D_H_FMM) using a high-order finite-difference operator.
- Validated the 3D_H_FMM with homogeneous and inhomogeneous velocity models.
- Applied the 3D_H_FMM in conjunction with particle swarm optimization for source localization.
Main Results:
- 3D_H_FMM reduced mean absolute error by 88.335% and 90.593% in homogeneous models compared to traditional 3D_FMM.
- Achieved a mean localization error of 1.901 m in small-scale inhomogeneous models.
- Demonstrated superior localization accuracy over traditional 3D_FMM.
Conclusions:
- The 3D_H_FMM significantly enhances P-wave travel time calculation accuracy in 3D.
- This method provides a substantial improvement in 3D microseismic source localization accuracy.
- The developed approach is effective for both homogeneous and inhomogeneous media.
