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DOI | 10.1029/2021GL096292 |
Frictional Characteristics of Oceanic Transform Faults: Progressive Deformation and Alteration Controls Seismic Style | |
Sophie Cox; Matt J. Ikari; Christopher J. MacLeod; Å; ke Fagereng | |
2021-12-09 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | Oceanic transform faults are inferred to be weak relative to surrounding oceanic crust and primarily slip aseismically. Neither their weakness nor tendency to creep are well-explained. We test the effects of fault-rock evolution on oceanic transform fault frictional strength and stability using direct-shear experiments (at room temperature, 10 MPa normal stress and fluid-saturated conditions) on dolerite from the East Pacific Rise and natural fault rocks from the exhumed Southern Troodos transform, Cyprus. Dolerites and cemented breccias are frictionally strong (µ = 0.52-0.85) and velocity-weakening (strength decreases with increasing slip velocity, characteristic of earthquakes). In contrast, matrix-rich chlorite-bearing fault breccias and gouges are frictionally weak (µ = 0.25-0.48) and velocity-strengthening (characteristic of stable creep). This transition implies that seismic behavior is controlled by degree of damage and alteration, such that earthquakes can nucleate within relatively intact oceanic crust, whereas fault segments of increased damage and chlorite content tend to slip aseismically. |
领域 | 气候变化 |
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/343001 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Sophie Cox,Matt J. Ikari,Christopher J. MacLeod,et al. Frictional Characteristics of Oceanic Transform Faults: Progressive Deformation and Alteration Controls Seismic Style[J]. Geophysical Research Letters,2021. |
APA | Sophie Cox,Matt J. Ikari,Christopher J. MacLeod,Å,&ke Fagereng.(2021).Frictional Characteristics of Oceanic Transform Faults: Progressive Deformation and Alteration Controls Seismic Style.Geophysical Research Letters. |
MLA | Sophie Cox,et al."Frictional Characteristics of Oceanic Transform Faults: Progressive Deformation and Alteration Controls Seismic Style".Geophysical Research Letters (2021). |
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