DOI: 10.1016/j.tecto.2020.228561
论文题名: Probing the relationship between electrical conductivity and creep through upper crustal fluids along the western part of the North Anatolian Fault with three-dimensional magnetotellurics
作者: Karaş M. ; Tank S.B. ; Ogawa Y. ; Oshiman N. ; Matsushima M. ; Honkura Y.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 791 语种: 英语
中文关键词: Armutlu Peninsula
; Creep
; Electrical resistivity
; Fluids
; Magnetotellurics
; North Anatolian Fault
英文关键词: Electric conductivity
; Faulting
; Magnetotellurics
; Aftershock distributions
; Earthquake activity
; Electrical conductivity
; Geophysical methods
; Mechanical attributes
; North Anatolian Fault
; Stress accumulation
; Vertical extension
; Earthquakes
; aftershock
; creep
; earthquake epicenter
; electrical conductivity
; electrical resistivity
; magnetotelluric method
; North Anatolian Fault
; seismicity
; upper crust
; Armutlu Peninsula
; Turkey
英文摘要: Seismic characteristics of any fault system are affected by the relationship between the relevant stress regime and the fluid content of a region. Under persistent stress accumulation, fluids can facilitate earthquake generation due to their effect on frictional forces. In this study, Armutlu Peninsula serves as a suitable example to investigate the role of fluid-rich environments in seismicity distribution. In the context of electrical resistivity characteristics provided by a fluid-sensitive geophysical method, namely magnetotellurics, seismogenic properties of the western part of the North Anatolian Fault are examined from its mechanical attributes to fault – fluid relationship. Near the epicenter of the catastrophic 1999 İzmit Earthquake, Hersek region appears as a fluid-rich environment between shallow creeping and aseismic strain releasing portions that bound highly resistive Armutlu Peninsula. Conductor related to fluid-rich environment extends until depth of approx. 10 km and precludes earthquake activity along the fault zone. High amount of fluids concentrated on particular conductive regions, may restrain earthquake distribution with the absence of mechanically strong structures around the fault zone. As a potential asymmetric damage zone appears around the NAF, both aftershock distributions of the 1999 İzmit Earthquake in the following three months and long-term earthquake data show a clear tendency for concentration on resistive parts of the study area. Fluid-rich regions possibly indicate the endpoints of the segments in the NAF. The final electrical resistivity model produced in this study reveals that interpreting tectonic, seismic or geological aspects of any fault system can plausibly be dependent on counting spatial extensions of fluid-rich environments. In order to correctly assemble interdisciplinary findings, it may be essential to consider more features than vertical extensions of conductive zones which, mostly indicate fluid-bearing regions. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170620
Appears in Collections: 气候变化与战略
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作者单位: Boğaziçi University, Kandilli Obs. & E.R.I., Çengelköy, İstanbul, Turkey; İstanbul Technical University, Faculty of Mines, Dept. of Geophysics, Maslak, İstanbul, Turkey; Tokyo Institute of Technology, Volcanic Fluid Research Center, Ookayama, Tokyo, Japan; Kyoto University, Disaster Prevention Research Center, Uji, Japan; Tokyo Institute of Technology, Dept. of Earth and Planetary Sci., Ookayama, Tokyo, Japan
Recommended Citation:
Karaş M.,Tank S.B.,Ogawa Y.,et al. Probing the relationship between electrical conductivity and creep through upper crustal fluids along the western part of the North Anatolian Fault with three-dimensional magnetotellurics[J]. Tectonophysics,2020-01-01,791