Abstract
Phase Shift Plus Interpolation (PSPI) Migration is one of the most popular migration methods that is used not only in Seismic Data Processing but also in interpreting high frequency electromagnetic prospecting [Ground Penetrating Radar (GPR) data]. Based on the similarities between the principle of the propagation of electromagnetic wave and the mechanical wave, migration methods could be applied to interpreting GPR data as a particular step to calculate the medium’s velocity, estimate the depth, shape and size of buried objects. Noticeably, there are two kinds of velocities usually used in migration methods: root mean square (RMS) velocity, which is used in F – K, Finite Difference and Kirchhoff Migration, and interval velocity, which is used in PSPI Migration. RMS velocity is the average velocity taken into account by considering the influence of the upper layer’s instantaneous velocity; whereas the interval velocity only reflect the practical velocity of one layer. In this paper, the problem of how to apply PSPI Migration to interpret GPR data will be presented. Some results of model datum and real datum were also examined. Besides, we made a comparison of using RMS velocity and interval velocity, and then explain how these two types of velocity could be combined to receive the best result.
Highlights
IntroductionGround Penetrating Radar (GPR) is the geophysical method, which uses electromagnetic wave (typically in the frequency range of 10 to 2000 MHz) [1] to study the structure of the shallow subsurface
Ground Penetrating Radar (GPR) is the geophysical method, which uses electromagnetic wave [1] to study the structure of the shallow subsurface
Reflection Seismic Exploration is the geophysical methods, which bases on the propagation of the mechanical wave to image subsurface structures and to obtains rock and soil’s properties
Summary
Ground Penetrating Radar (GPR) is the geophysical method, which uses electromagnetic wave (typically in the frequency range of 10 to 2000 MHz) [1] to study the structure of the shallow subsurface. In recent years, based on the similarities between the principle of the propagation of electromagnetic wave and the mechanical wave (the operators and the variables of two wave equations), migration methods have been studied noticeably to apply to interpreting GPR data. Among those methods, the Phase Shift Plus Interpolation Migration (PSPI migration), which relates to the downward continuation method, being firstly published in 1984 in Geophysics by Jeno Gazdag and TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 19, SOÁ T1 - 2016
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