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  Crustal Shortening and Rheological Behavior Across the Longmen Shan Fault, Eastern Margin of the Tibetan Plateau

Zhu, Y., Diao, F., Wang, R., Hao, M., Shao, Z., Xiong, X. (2022): Crustal Shortening and Rheological Behavior Across the Longmen Shan Fault, Eastern Margin of the Tibetan Plateau. - Geophysical Research Letters, 49, 11, e2022GL098814.
https://doi.org/10.1029/2022GL098814

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Zhu, Yage1, Author
Diao, Faqi1, Author
Wang, R.2, Author              
Hao, Ming1, Author
Shao, Zhigang1, Author
Xiong, Xiong1, Author
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1External Organizations, ou_persistent22              
22.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146029              

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 Abstract: Knowledge of lithospheric rheology can provide fundamental insights into crustal deformation near the Longmen Shan fault (LMSF). Based on viscoelastic deformation models constrained by interseismic geodetic observations, we obtain an optimal crustal shortening rate of 4.8 ± 0.4 mm/a across the LMSF and an upper mantle viscosity of 5.0 × 1020−21 Pa · s beneath eastern Tibet. More importantly, we find a high-viscosity zone (>1021 Pa · s) in the lower crust beneath the LMSF, where the steady-state viscosity is significantly higher than the transient viscosity derived from postseismic deformation. Further investigations with a power-law rheology suggest that, due to the stress loading of the Wenchuan earthquake and the relaxation afterwards, the effective lower crustal viscosity decreases to ∼1018 Pa · s immediately after the earthquake and finally recovers to interseismic level (∼1021 Pa · s). Our results highlight the stress-dependent behavior and the viscoelastic effect of rheological structure beneath the LMSF during the earthquake cycle.

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 Dates: 2022-05-272022
 Publication Status: Finally published
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 Identifiers: DOI: 10.1029/2022GL098814
GFZPOF: p4 T3 Restless Earth
OATYPE: Green Open Access
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Title: Geophysical Research Letters
Source Genre: Journal, SCI, Scopus, ab 2023 oa
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Pages: - Volume / Issue: 49 (11) Sequence Number: e2022GL098814 Start / End Page: - Identifier: ISSN: 1944-8007
ISSN: 0094-8276
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals182
Publisher: American Geophysical Union (AGU)