Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
2D Magnetotelluric Occam Inversion with Topography Constrained by Seismic Reflection Interfaces and cross-gradient Structure Coupling: A Case Study of the Longmen Shan Fault Zone. |
| Συγγραφείς: |
Liu, Hao1,2 (AUTHOR), Peng, Miao1 (AUTHOR) pengm@cugb.edu.cn, Tan, Han-Dong1 (AUTHOR), Peng, Fei3 (AUTHOR), Zhang, Jin-Song1 (AUTHOR) |
| Πηγή: |
Applied Geophysics: Bulletin of Chinese Geophysical Society. Sep2026, p1-15. 15p. |
| Θεματικοί όροι: |
*Inversion (Geophysics), *Seismic reflection method, *Topography, *Electrical resistivity, *Imaging systems in geophysics, *Fault zones |
| Περίληψη: |
Occam inversion inherently produces smooth models, making it challenging to accurately resolve the geometries and sharp boundaries of complex structures such as faults, with topographic variations further distorting the inverted electrical images. Post-stack seismic reflection profiles provide precise identification of stratigraphic and fault interfaces, while independent seismic surveys yield prior information on subsurface S-wave velocity structures. To leverage these complementary datasets, we propose a two-dimensional magnetotelluric (MT) inversion method that accounts for topographic effects and is jointly constrained by seismic reflection interfaces and cross-gradient structural coupling. Within the Occam inversion framework, seismic reflection envelopes are first extracted from migrated profiles via the Hilbert transform. Combined with topographic conditions, the terrain-adaptive seismic constraint matrix is calculated from the envelope data, and this matrix is incorporated into the model regularization term. Furthermore, a topography-incorporated cross-gradient term is introduced to enforce structural similarity between the resistivity model and a prior seismic Vs model. Synthetic tests demonstrate that this dual-constrained inversion yields more accurate delineation of anomalous bodies and sharper structural boundaries, particularly for low-resistivity features, compared to conventional smoothness-constrained or single-constraint inversions. Application to field data from the Longmen Shan fault zone reveals improved data fit and electrical structures that are more consistent with interpreted seismic reflection interfaces. Notably, the approach improves the resolution of fault zone geometries and delineates stratigraphic contacts with greater precision within the study area. [ABSTRACT FROM AUTHOR] |
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