Three-dimensional finite element forward modeling of transient electromagnetic response for grounded-wire source

Jun ZHOU, Shuai RUAN, Ke HE, Chu JIAN

Prog Geophy ›› 2026, Vol. 41 ›› Issue (1) : 174-181.

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Prog Geophy ›› 2026, Vol. 41 ›› Issue (1) : 174-181. DOI: 10.6038/pg2026JJ0054

Three-dimensional finite element forward modeling of transient electromagnetic response for grounded-wire source

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Abstract

To address the three-dimensional (3D) forward modeling problem of transient electromagnetic fields for grounded-wire source, this paper explores a finite element forward modeling method that employs a frequency-time transformation and background-scattered field separation strategy. It utilizes the vector finite element theory, and the 3D model is discretized using structured hexahedral mesh. Subsequently, the frequency-domain numerical response is computed using the MUMPS solver. Ultimately, the time-domain transient electromagnetic response is derived via cosine transformation. On this basis, the reliability of the forward algorithm is validated using both a one-dimensional layered model and an open three-dimensional model, and its computational accuracy is assessed. Theoretical examples show that the calculation results of the 3D transient electromagnetic forward modeling proposed in this paper are accurate and can meet the calculation requirements of 3D inversion research.

Key words

Grounded-wire source / Transient electromagnetic / Three-dimensional forward modeling / Vector finite element method

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Jun ZHOU , Shuai RUAN , Ke HE , et al. Three-dimensional finite element forward modeling of transient electromagnetic response for grounded-wire source[J]. Progress in Geophysics. 2026, 41(1): 174-181 https://doi.org/10.6038/pg2026JJ0054

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