DOI: 10.1038/ngeo2775
论文题名: Precursory changes in seismic velocity for the spectrum of earthquake failure modes
作者: Scuderi M.M. ; Marone C. ; Tinti E. ; Di Stefano G. ; Collettini C.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 9 起始页码: 695
结束页码: 700
语种: 英语
Scopus关键词: earthquake damage
; elasticity
; failure mechanism
; fault slip
; laboratory method
; seismic velocity
; tectonic setting
英文摘要: Temporal changes in seismic velocity during the earthquake cycle have the potential to illuminate physical processes associated with fault weakening and connections between the range of fault slip behaviours including slow earthquakes, tremor and low-frequency earthquakes. Laboratory and theoretical studies predict changes in seismic velocity before earthquake failure; however, tectonic faults fail in a spectrum of modes and little is known about precursors for those modes. Here we show that precursory changes of wave speed occur in laboratory faults for the complete spectrum of failure modes observed for tectonic faults. We systematically altered the stiffness of the loading system to reproduce the transition from slow to fast stick-slip and monitored ultrasonic wave speed during frictional sliding. We find systematic variations of elastic properties during the seismic cycle for both slow and fast earthquakes indicating similar physical mechanisms during rupture nucleation. Our data show that accelerated fault creep causes reduction of seismic velocity and elastic moduli during the preparatory phase preceding failure, which suggests that real-Time monitoring of active faults may be a means to detect earthquake precursors. © 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105927
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Dipartimento di Scienze della Terra, La Sapienza Università di Roma, Piaz. Aldo Moro 5, Rome, Italy; Istituto Nazionale di Geofisica e Vulcanologia (INGV), Via di Vigna Murata 605, Rome, Italy; Department of Geoscience, Pennsylvania State University, University Park, Pennsylvania, United States
Recommended Citation:
Scuderi M.M.,Marone C.,Tinti E.,et al. Precursory changes in seismic velocity for the spectrum of earthquake failure modes[J]. Nature Geoscience,2016-01-01,9(9)