| DOI: | 10.1002/grl.50142
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| 论文题名: | Intra-plate seismicity and flexural stresses in central Brazil |
| 作者: | Assumpção M.; Sacek V.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9340
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| EISSN: | 1944-9071
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| 出版年: | 2013
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| 卷: | 40, 期:3 | | 起始页码: | 487
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| 结束页码: | 491
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| 语种: | 英语
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| 英文关键词: | Brazil
; flexural stress
; intraplate seismicity
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| Scopus关键词: | Deformation
; Stress concentration
; Brazil
; Central brazils
; Extensional stress
; Flexural deformations
; Flexural stress
; Intraplate seismicity
; Major factors
; South America
; Seismology
; compressive strength
; correlation
; flexure
; gravity anomaly
; intraplate process
; seismic zone
; seismicity
; upper crust
; Brazil
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| 英文摘要: | Explaining intra-plate seismicity is a challenging task. Different models have been proposed combining weak zones and stress concentration mechanisms. Here we propose that flexural deformation is a major factor to explain seismicity in Central Brazil. A SW-NE-oriented seismic zone between the Amazon and the São Francisco cratons coincides with high gravity anomalies, possibly due to a SW-NE belt of thin crust. The load from the high-density, shallow mantle rocks causes upper crustal compressional stresses up to 100 MPa in the 200 km wide seismic zone. Away from the central zone of horizontal compression, extensional stresses in the peripheral bulge balance the regional compression explaining the aseismic areas. Three other seismic clusters in Brazil also correlate with high gravity anomalies, suggesting that flexural deformation contributes significantly to explain mid-plate seismicity in Brazil. Key Points Flexural stresses are a major factor to explain the Central Brazil Seismic zone Flexural stresses may be important all over mid-plate South America Our work may motivate search for similar correlation in other intra-plate areas ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878177541&doi=10.1002%2fgrl.50142&partnerID=40&md5=75395ff95359602cfd5cb4367ded2824
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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/6604
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, São Paulo 05508-090, Brazil
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| Recommended Citation: | |
Assumpção M.,Sacek V.. Intra-plate seismicity and flexural stresses in central Brazil[J]. Geophysical Research Letters,2013-01-01,40(3).
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