DOI: 10.1016/j.tecto.2020.228352
论文题名: Unraveling the complex deformation pattern at Yellowstone plateau through seismicity and fracture analysis
作者: Russo E. ; Tibaldi A. ; Waite G.P. ; Bonali F.L. ; Massin F. ; Farrell J.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 778 语种: 英语
中文关键词: Earthquakes
; Fault
; Fractures
; Seismicity
; Stress
; Yellowstone
英文关键词: Deformation
; Earthquakes
; Faulting
; Flow of fluids
; Fracture
; Kinematics
; Stresses
; Strike-slip faults
; Structural geology
; Complex deformation
; Earthquake catalogs
; Earthquake swarms
; Fluid overpressure
; Seismicity
; Strike slip faulting
; Strike-slip motion
; Yellowstones
; Fault slips
; deformation
; earthquake
; earthquake catalogue
; earthquake swarm
; fault plane
; focal mechanism
; fracture
; normal fault
; seismicity
; stress
; strike-slip fault
; Montana
; United States
; Yellowstone County
英文摘要: The intense unrest of the Yellowstone volcanic plateau is manifested through diffuse seismic activity, earthquake swarms, and episodes of complex surficial deformation that have been related to magmatic fluid transfer in the upper crust over the past several decades. While past studies have focused on modeling contemporary geophysical data, there has not been a fully-integrated evaluation of seismicity, fault kinematics, and stress field. Here we analyze a catalog of 10,201 relocated earthquakes recorded between 2010 and 2016 and determine 224 well-constrained double-couple focal mechanisms. The majority of the focal mechanisms (65%) are associated with the 2010 Madison Plateau seismic swarm. The focal mechanisms are predominantly strike-slip with subordinate normal faulting mechanisms. Possible causes of this predominance and of the concurrence of both kinematics are here discussed, in order to unravel the influence of magmatic processes such as past sill intrusions. The earthquake catalog has been analyzed in terms of location, time, and kinematics according to the phases of surficial deformation documented by GPS data in order to identify systematic patterns of deformation and has been compared to the 1988–2009 seismicity. The continuous downwarping of the overburden from 2010 to 2016 was accomodated by structural adjustment of the shallow crust through strike-slip motions on a multitude of scattered small fault planes. Furthermore, the predominance of strike-slip faulting during seismic swarms occurs when the fluid overpressure induces horizontal propagation of vertical fractures with strike-slip motions, followed by horizontal fluid flow. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170701
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Environmental Sciences, University of Milan-Bicocca, Milan, Italy; CRUST- Interuniversity Center for 3D Seismotectonics with Territorial Applications, Italy; Department of Geological and Mining Engineering and Science, Michigan Technological University, Houghton, United States; ETH-Zurich, Swiss Seismological Service (SED), Zurich, CH-8092, Switzerland; Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States
Recommended Citation:
Russo E.,Tibaldi A.,Waite G.P.,et al. Unraveling the complex deformation pattern at Yellowstone plateau through seismicity and fracture analysis[J]. Tectonophysics,2020-01-01,778