Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/s41467-020-15150-x |
Earthquake nucleation in the lower crust by local stress amplification | |
L. R. Campbell; L. Menegon; Å; . Fagereng; G. Pennacchioni | |
2020-03-12 | |
发表期刊 | Nature
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出版年 | 2020 |
英文摘要 | Deep intracontinental earthquakes are poorly understood, despite their potential to cause significant destruction. Although lower crustal strength is currently a topic of debate, dry lower continental crust may be strong under high-grade conditions. Such strength could enable earthquake slip at high differential stress within a predominantly viscous regime, but requires further documentation in nature. Here, we analyse geological observations of seismic structures in exhumed lower crustal rocks. A granulite facies shear zone network dissects an anorthosite intrusion in Lofoten, northern Norway, and separates relatively undeformed, microcracked blocks of anorthosite. In these blocks, pristine pseudotachylytes decorate fault sets that link adjacent or intersecting shear zones. These fossil seismogenic faults are rarely >15鈥塵 in length, yet record single-event displacements of tens of centimetres, a slip/length ratio that implies >1鈥塆Pa stress drops. These pseudotachylytes represent direct identification of earthquake nucleation as a transient consequence of ongoing, localised aseismic creep. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249694 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | L. R. Campbell,L. Menegon,Å,et al. Earthquake nucleation in the lower crust by local stress amplification[J]. Nature,2020. |
APA | L. R. Campbell,L. Menegon,Å,. Fagereng,&G. Pennacchioni.(2020).Earthquake nucleation in the lower crust by local stress amplification.Nature. |
MLA | L. R. Campbell,et al."Earthquake nucleation in the lower crust by local stress amplification".Nature (2020). |
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