scholarly journals Frictional properties of fault zone gouges from the J-FAST drilling project (Mw 9.0 2011 Tohoku-Oki earthquake)

2015 ◽  
Vol 42 (8) ◽  
pp. 2691-2699 ◽  
Author(s):  
F. Remitti ◽  
S. A. F. Smith ◽  
S. Mittempergher ◽  
A. F. Gualtieri ◽  
G. Di Toro
Keyword(s):  
Fault Zone ◽  
Frictional Properties ◽  
Drilling Project

Fibrous clay mineral authigenesis induced by fluid-rock interaction in the Galera fault zone (Betic Cordillera, SE Spain) and its influence on fault gouge frictional properties

2016 ◽  
Vol 134 ◽  
pp. 275-288 ◽  
Author(s):  
Catalina Sánchez-Roa ◽  
Juan Jiménez-Millán ◽  
Isabel Abad ◽  
Daniel R. Faulkner ◽  
Fernando Nieto ◽  
...  
Keyword(s):  
Fault Zone ◽  
Clay Mineral ◽  
Fault Gouge ◽  
Betic Cordillera ◽  
Se Spain ◽  
Rock Interaction ◽  
Frictional Properties

scholarly journals Back-propagating super-shear rupture in the 2016 M7.1 Romanche transform fault earthquake

2020 ◽  
Author(s):  
Stephen Hicks ◽  
Ryo Okuwaki ◽  
Andreas Steinberg ◽  
Catherine Rychert ◽  
Nicholas Harmon ◽  
...  
Keyword(s):  
Fault Zone ◽  
Back Propagation ◽  
Plate Boundaries ◽  
Transform Fault ◽  
Equatorial Atlantic ◽  
Ground Shaking ◽  
Frictional Properties ◽  
Shear Rupture ◽  
Two Phases ◽  
Favourable Environment

<p>Rupture propagation of an earthquake strongly influences potentially destructive ground shaking. Variable rupture behaviour is often caused by complex fault geometries, masking information on fundamental frictional properties. Geometrically smoother ocean transform fault (OTF) plate boundaries offer a favourable environment to study fault zone dynamics because strain is accommodated along a single, wide zone (up to 20 km width) offsetting homogeneous geology comprising altered mafic or ultramafic rocks. However, fault friction during OTF ruptures is unknown: no large (M<sub>w</sub>>7.0) ruptures had been captured and imaged in detail. In 2016, we recorded an M<sub>w</sub> 7.1 earthquake on the Romanche OTF in the equatorial Atlantic on nearby seafloor seismometers. We show that this rupture had two phases: (1) up and eastwards propagation towards the weaker ridge-transform intersection (RTI), then (2) unusually, back-propagation westwards at super-shear speed toward the fault’s centre. Deep slip into weak fault segments facilitated larger moment release on shallow locked zones, highlighting that even ruptures along a single distinct fault zone can be highly dynamic. The possibility of reversing ruptures is absent in rupture simulations and unaccounted for in hazard assessments.</p>

scholarly journals Subsurface Structure, Fault Zone Characteristicsand Stress State in Scientific Drill Holes of Taiwan Chelungpu Fault Drilling Project

2007 ◽  
Vol SpecialIssue ◽  
pp. 55-58 ◽  
Author(s):  
J.-H. Hung ◽  
K.-F. Ma ◽  
C.-Y. Wang ◽  
S.-R. Song ◽  
H. Ito ◽  
...  
Keyword(s):  
Stress State ◽  
Fault Zone ◽  
Subsurface Structure ◽  
Chelungpu Fault ◽  
Drill Holes ◽  
Drilling Project

No abstract available. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.s01.27.2007" target="_blank">10.2204/iodp.sd.s01.27.2007</a>

scholarly journals Haiti-Drill: an amphibious drilling project workshop

2020 ◽  
Vol 28 ◽  
pp. 49-62
Author(s):  
Chastity Aiken ◽  
Richard Wessels ◽  
Marie-Hélène Cormier ◽  
Frauke Klingelhoefer ◽  
Anne Battani ◽  
...  
Keyword(s):  
Fault Zone ◽  
Fault Zones ◽  
Strike Slip ◽  
Slip Rates ◽  
Significant Research ◽  
Research Questions ◽  
East West ◽  
Existing Data ◽  
Focus Point ◽  
Drilling Project

Abstract. The Haiti region – bounded by two strike-slip faults expressed both onshore and offshore – offers a unique opportunity for an amphibious drilling project. The east–west (EW)-striking, left lateral strike-slip Oriente–Septentrional fault zone and Enriquillo–Plantain Garden fault zone bounding Haiti have similar slip rates and also define the northern and southern boundaries of the Gonâve Microplate. However, it remains unclear how these fault systems terminate at the eastern boundary of that microplate. From a plate tectonic perspective, the Enriquillo–Plantain Garden fault zone can be expected to act as an inactive fracture zone bounding the Cayman spreading system, but, surprisingly, this fault has been quite active during the last 500 years. Overall, little is understood in terms of past and present seismic and tsunami hazards along the Oriente–Septentrional fault zone and Enriquillo–Plantain Garden fault zone, their relative ages, maturity, lithology, and evolution – not even the origin of fluids escaping through the crust is known. Given these unknowns, the Haiti-Drill workshop was held in May 2019 to further develop an amphibious drilling project in the Haiti region on the basis of preproposals submitted in 2015 and their reviews. The workshop aimed to complete the following four tasks: (1) identify significant research questions; (2) discuss potential drilling scenarios and sites; (3) identify data, analyses, additional experts, and surveys needed; and (4) produce timelines for developing a full proposal. Two key scientific goals have been set, namely to understand the nature of young fault zones and the evolution of transpressional boundaries. Given these goals, drilling targets were then rationalized, creating a focus point for research and/or survey needs prior to drilling. Our most recent efforts are to find collaborators, analyze existing data, and to obtain sources of funding for the survey work that is needed.

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