Progressive strain localization in a major strike‐slip fault exhumed from midseismogenic depths: Structural observations from the Salzach‐Ennstal‐Mariazell‐Puchberg fault system, Austria

2009 ◽  
Vol 114 (B4) ◽  
Author(s):  
Erik Frost ◽  
James Dolan ◽  
Charles Sammis ◽  
Brad Hacker ◽  
Joshua Cole ◽  
...  
Keyword(s):  
Strain Localization ◽  
Strike Slip ◽  
Strike Slip Fault ◽  
Fault System ◽  
Major Strike ◽  
Progressive Strain

scholarly journals Fast Holocene slip and localized strain along the Liquiñe-Ofqui strike-slip fault system, Chile

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Luis Astudillo-Sotomayor ◽  
Julius Jara-Muñoz ◽  
Daniel Melnick ◽  
Joaquín Cortés-Aranda ◽  
Andrés Tassara ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Strain Localization ◽  
Slip Rate ◽  
Strike Slip ◽  
Strike Slip Fault ◽  
Fault System ◽  
Plate Convergence ◽  
Active Tectonic ◽  
Millennial Time Scale ◽  
Hazard Assessments

AbstractIn active tectonic settings dominated by strike-slip kinematics, slip partitioning across subparallel faults is a common feature; therefore, assessing the degree of partitioning and strain localization is paramount for seismic hazard assessments. Here, we estimate a slip rate of 18.8 ± 2.0 mm/year over the past 9.0 ± 0.1 ka for a single strand of the Liquiñe-Ofqui Fault System, which straddles the Main Cordillera in Southern Chile. This Holocene rate accounts for ~ 82% of the trench-parallel component of oblique plate convergence and is similar to million-year estimates integrated over the entire fault system. Our results imply that strain localizes on a single fault at millennial time scale but over longer time scales strain localization is not sustained. The fast millennial slip rate in the absence of historical Mw > 6.5 earthquakes along the Liquiñe-Ofqui Fault System implies either a component of aseismic slip or Mw ~ 7 earthquakes involving multi-trace ruptures and > 150-year repeat times. Our results have implications for the understanding of strike-slip fault system dynamics within volcanic arcs and seismic hazard assessments.

Flower structures in sandstones of the Paleozoic Inkisi Group (Brazzaville, Republic of Congo): evidence for two major strike-slip fault systems and geodynamic implications

2020 ◽  
Vol 123 (4) ◽  
pp. 531-550
Author(s):  
H.M.D-V. Nkodia ◽  
T. Miyouna ◽  
D. Delvaux ◽  
F. Boudzoumou
Keyword(s):  
Strike Slip ◽  
Strike Slip Fault ◽  
Fault System ◽  
Republic Of Congo ◽  
Fault Systems ◽  
Major Fault ◽  
Major Strike ◽  
Flower Structures ◽  
Dextral Strike Slip ◽  
East West

Abstract Few studies have reported field descriptions of flower structures associated with strike-slip faults. This study describes and illustrates flower structures near Brazzaville (Republic of Congo) and explains their implication for the tectonic history of the Paleozoic Inkisi Group. Field observations show that the Inkisi Group is affected by two major strike-slip fault systems. The oldest system is dominated by north-northwest–south-southeast striking sinistral strike-slip faults and minor east–west striking dextral strike-slip faults. The youngest system consists of dominant northeast–southwest striking dextral strike-slip faults and minor northwest–southeast striking sinistral strike-slip faults. Flower structures within these major strike slip faults show four types of arrangements that likely depend on fault growth, propagation and damage zones: (i) flower structures associated with wall damage zones; (ii) flower structures associated with linking damage zones; (iii) flower structures associated with tip damage zones; and (iv) “hourglass” flower structures. Paleostress analysis reveals that both major fault systems originated from two differently oriented pure strike-slip regime stress stages. The first stage, which engendered the first major fault system, developed under northwest–southeast compression (i.e, σ1 = 322°). This phase probably coincided with north–south collision in the southern part of Gondwana in the Permo-Triassic and the Late Cretaceous compression times. The second stress stage, creating the second major fault system, developed under east–west (i.e, σ1 = 078°) compression. This phase is correlated with compression from the east–west opening of the Atlantic Ocean in the Miocene times.

Travertine occurrences along major strike-slip fault zones: structural, depositional and geochemical constraints from the Eastern Anatolian Fault System (EAFS), Turkey

2015 ◽  
Vol 27 (2-3) ◽  
pp. 155-174 ◽  
Author(s):  
Serap Çolak Erol ◽  
Mehmet Özkul ◽  
Ercan Aksoy ◽  
Sándor Kele ◽  
Bassam Ghaleb
Keyword(s):  
Fault Zones ◽  
Strike Slip ◽  
Strike Slip Fault ◽  
Fault System ◽  
Major Strike ◽  
Geochemical Constraints
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