| DOI: | 10.1016/j.epsl.2017.10.053
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| Scopus记录号: | 2-s2.0-85033560612
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| 论文题名: | Seismic behaviour of mountain belts controlled by plate convergence rate |
| 作者: | Dal Zilio L.; van Dinther Y.; Gerya T.V.; Pranger C.C.
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| 刊名: | Earth and Planetary Science Letters
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| ISSN: | 0012821X
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| 出版年: | 2018
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| 卷: | 482 | | 起始页码: | 81
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| 结束页码: | 92
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| 语种: | 英语
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| 英文关键词: | convergence rate
; Gutenberg–Richter law
; mountain belts
; numerical modelling
; seismicity
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| Scopus关键词: | Geophysics
; Hazards
; Landforms
; Numerical models
; Plates (structural components)
; Seismic response
; Seismology
; Strain rate
; Tectonics
; Continental collisions
; Convergence rates
; Earthquake magnitudes
; Magnitude distribution
; Mountain belts
; Relative contribution
; Rheological profiles
; seismicity
; Earthquakes
; continental collision
; deformation
; earthquake magnitude
; mountain region
; numerical model
; plate convergence
; seismic hazard
; seismic response
; seismicity
; Alps
; Apennines
; Himalayas
; Italy
; Zagros
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| 英文摘要: | The relative contribution of tectonic and kinematic processes to seismic behaviour of mountain belts is still controversial. To understand the partitioning between these processes we developed a model that simulates both tectonic and seismic processes in a continental collision setting. These 2D seismo-thermo-mechanical (STM) models obtain a Gutenberg–Richter frequency–magnitude distribution due to spontaneous events occurring throughout the orogen. Our simulations suggest that both the corresponding slope (b value) and maximum earthquake magnitude (MWmax) correlate linearly with plate convergence rate. By analyzing 1D rheological profiles and isotherm depths we demonstrate that plate convergence rate controls the brittle strength through a rheological feedback with temperature and strain rate. Faster convergence leads to cooler temperatures and also results in more larger seismogenic domains, thereby increasing both MWmax and the relative number of large earthquakes (decreasing b value). This mechanism also predicts a more seismogenic lower crust, which is confirmed by a transition from uni- to bi-modal hypocentre depth distributions in our models. This transition and a linear relation between convergence rate and b value and MWmax is supported by our comparison of earthquakes recorded across the Alps, Apennines, Zagros and Himalaya. These results imply that deformation in the Alps occurs in a more ductile manner compared to the Himalayas, thereby reducing its seismic hazard. Furthermore, a second set of experiments with higher temperature and different orogenic architecture shows the same linear relation with convergence rate, suggesting that large-scale tectonic structure plays a subordinate role. We thus propose that plate convergence rate, which also controls the average differential stress of the orogen and its linear relation to the b value, is the first-order parameter controlling seismic hazard of mountain belts. © 2017 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/110130
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| Appears in Collections: | 影响、适应和脆弱性
气候变化事实与影响
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作者单位: | Geophysical Fluid Dynamics, ETH Zürich, Sonneggstrasse 5, Zürich, 8092, Switzerland; Computational Seismology, ETH Zürich, Sonneggstrasse 5, Zürich, 8092, Switzerland
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| Recommended Citation: | |
Dal Zilio L.,van Dinther Y.,Gerya T.V.,et al. Seismic behaviour of mountain belts controlled by plate convergence rate[J]. Earth and Planetary Science Letters,2018-01-01,482
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