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inferring fault strength from earthquake rupture

inferring fault strength from earthquake rupture

6.1 Earthquake Geometry and Process - Geosciences

At 20 seconds,the rupture has progressed along the entire length of the fault.The fault has reached its maximum displacement,and the earthquake stops.In general,backtracking seismic energy allows us to see its source on the fault.We can also get total slip this way.Figure \(\PageIndex{11}\) Rupture with TimeAuthor Valère Lambert,Nadia Lapusta,Stephen PerryPublish Year 2021Inferring fault rupture dynamics from strong motion data An inversion method is presented that combines a spontaneous rupture code and a linear programming algorithm to image earthquake rupture dynamics consistent with ground motion data.The spontaneous rupture code is converted into an inversion algorithm by imposing the slip required by the data as a boundary condition to the solution of the elastodynamics equation.CiteSeerX Inferring Segment Strength Contrasts and CiteSeerX - Document Details (Isaac Councill,Lee Giles,Pradeep Teregowda) Abstract Rupture segmentation arises from changes in fault geometry and strength.We use boundary element models of frictionless strike-slip fault segments to quantify how fault geometry and strength change earthquake surface offset distri-butions.Using these relationships between fault geometry,strength,and

Cited by 14Publish Year 2018Author Alex CopleyEarthquake fracture energy inferred from kinematic rupture

Jul 03,2008·Breakdown work density and its integral over the fault,breakdown energy,scale with seismic moment according to a power law (with exponent 0.59 and 1.18,respectively).Our estimates of breakdown work range between 4 × 10 5 and 2 × 10 7 J/m 2 for earthquakes having moment magnitudes between 5.6 and 7.2.Cited by 14Publish Year 2018Author Alex CopleyFault roughness and strength heterogeneity control Jan 13,2017·Using a stress drop of 6 MPa on geometrically rough rupture surfaces,along with the spatial heterogeneity of fault strength,explains the observational data in the 110 MPa,planarreference range.Stress drop is not required to vary as much as previously suggested if fault geometry and strength heterogeneity are accounted for.Cited by 151Publish Year 2005Author E.Tinti,P.Spudich,M.CoccoFault-Zone Properties arid Earthquake Rupture Dynamics2.4.Effects of Damage on Earthquake Rupture in a Poroelastic Medium 196 2.5.Rheology of Damage Zone ,197 3.Fault Growth on a Bimaterial Interface 199 3.1.Field Observation of Faults 199 3.2.Quasi-Static Features of In-Plane Tensile Crack 199 3.3.Theoretical and Numerical Studies of Dynamic Fault Slip 199 3.4.Regularization of an Ill

Cited by 20Publish Year 2014Author Thomas K.Rockwell,Daniel E.Ragona,Andrew J.Meigs,Lewis A.Owen,Carlos H.Costa,Emilio A.AhuEarthquake Ruptures with Strongly Rate-Weakening

Earthquake Ruptures with Strongly Rate-Weakening Friction and Off-Fault Plasticity,Part 2 Nonplanar Faults by Eric M.Dunham,David Belanger,Lin Cong,and Jeremy E.Kozdon Abstract Observations demonstrate that faults are fractal surfaces with deviations from planarity at all scales.We study dynamic rupture propagation on self-similarCited by 2Publish Year 2001Author Mariagiovanna GuatteriInferring Segment Strength Contrasts and Boundaries along We use boundary element models of frictionless strike-slip fault segments to quantify how fault geometry and strength change earthquake surface offset distributions.Using these relationships between fault geometry,strength,and surface offsets,we can infer fault strength from the surface offsets in cases where the fault geometry can be independently constrained.Cited by 33Publish Year 2017Author Olaf Zielke,Martin Galis,Paul Martin MaiEarthquake rupture propagation inferred from the spatial Jun 15,2014·Earthquake rupture propagation inferred from the spatial distribution of fault rock frictional properties Sets of smaller-scale secondary R fractures and P shears within these fault zones allow to infer the movement sense size of the contacts and nature of the contact) as well as the strength of the contacts can potentially lead to

Cited by 4Publish Year 2019Author Shunya Kaneki,Shunya Kaneki,Tetsuro HironoStress and pore fluid pressure control of seismicity rate

Jan 07,2021·where s is the fault strength, n is the normal (positive in compression) stress,P f is the pore fluid pressure,and µ is the friction coefficient of the fault.The Coulomb failure stress (CFS) is defined by the difference between shear stress and fault strength of a receiver fault.The CFS is its change caused by a preceding event:Cited by 66Publish Year 2014Author André R.Niemeijer,Reinoud L.M.VissersSimilarity of fast and slow earthquakes illuminated by strophic failure.For both slow and fast earthquakes,we find a map-ping between fault strength and statistical attributes of the elastic radiation emitted throughout the seismic cycle.These data provide a method for reading the internal state of a fault zone,which can be used to predict earthquake-like failure for a spectrum of slip modes.Cited by 6Publish Year 2002Author Stephen A.Miller(PDF) Inferring fault strength from earthquake rupture A recently proposed hypothesis for quantifying the strength at which faults fail uses earthquake scaling arguments to show that earthquakes fail over a range of strengths in the upper 1520 km

Diagenetic and shear-induced transitions of frictional

May 27,2019·Subduction-related diagenetic reactions affect fault strength and are thus important for understanding earthquake rupture dynamics in subduction zones.Carbonaceous material (CM) isDynamic ruptures in recent models of earthquake faultswhich earthquake ruptures consist of narrow propagating slip pulses with little gener-ation of frictional heat.Scholz and Hanks (2000) noted that the data used to infer on fault strength are highly noisy and suggested that fault strength during slip is indeed governed by Byerlee values of friction.They criticized various proposed mechanismsEarthquake Recurrence and Rupture Dynamics of Himalayan Dec 14,2001·The Black Mango fault is a structural discontinuity that transforms motion between two segments of the active Himalayan Frontal Thrust (HFT) in northwestern India.The Black Mango fault displays evidence of two large surface rupture earthquakes during the past 650 years,subsequent to 1294 A.D.and 1423 A.D.,and possibly another rupture at about 260 A.D.Displacement during the

Earthquake rupture dependence on hypocentral location

Aug 15,2019·Fault strength s is assumed to be spatially uniform and is set to be slightly larger than the maximum initial stress (Yang et al.,2019).Because the locking models are regularized by smoothing parameters,generally that minimize the second-order derivative of slip (first-order derivative of strain or stress),and a selective choice is made that will control the resultant fault stress field,the fieldsEarthquakes Within Earthquakes Patterns in RuptureEarthquakes Within Earthquakes Patterns in Rupture Complexity Philippe Danré1,2,Jiuxun Yin 1,Bradley P.Lipovsky ,and Marine A.Denolle 1Department of Earth and Planetary Sciences,Harvard University,Cambridge,MA,USA,2Département de Géosciences,École Normale Supérieure,PSL Research University,Paris,FranceGEOPHYSICS Copyright © 2020 Repeating earthquakesThe recurrence interval and rupture characteristics of these megathrust events are strongly influenced by fault strength (resist­ ance to shear stress before slip) and frictional properties of the

Inferences from the Field - Effects of Geometry on

Inferences from the Field - Effects of Geometry on Earthquake Ruptures Glenn Biasi,U.S.Geological Survey rupture,fault just ends.Paired normal ruptures,strange rupture path.Giant paired rupture offsets. mechanical strength of step.Event numbersInferring a ThrustRelated Earthquake History from Dec 17,2013·Trenches excavated across the surface rupture of the 15 January 1944 M w 7 San Juan,Argentina,earthquake show evidence for repeated rupture of La Laja fault in the late Pleistocene and Holocene.The 1944 rupture extended for about 7 km striking N35°E,and dipping 42° E parallel to Neogene bedding,with a maximum eastsideup vertical displacement of 30 cm.Inferring earthquake physics and chemistry using an After an earthquake,faults can recover strength through fault healing,but the mechanisms responsible are not well understood.

Inferring fault strength from earthquake rupture

·Indirect inferences based upon a range of geophysical and geological observations suggest that faults fail in earthquakes at shear stresses of less than c.50 MPa,equivalent to effective coefficients of friction of less than 0.3,and possibly as low as 0.05.Inferring fault strength from earthquake rupture Jun 26,2014·The strength of seismogenic faults is fundamental to earthquake mechanics and plate tectonics,affecting many subsidiary processes in the solid earth.The key to understanding fault strength is determining the pore pressures and hydraulic properties within the faults and surrounding crust.The debate has lasted over decades,with evidence provided for both strong fault and weak faultProgressive failure on the North Anatolian fault since fault.We find that all but one earthquake increased the stress towards failure at the site of the subsequent shocks,and inhibited failure on most fault segments that did not rupture.We argue that the calculated several-bar stress increases raised the earthquake probability three-fold during the ensuing

Propagation of large earthquakes as self-healing pulses or

Mar 10,2021·The initial stress on the majority of the fault is far below the quasi-static strength,except for the region in which the rupture nucleates,which is small compared to the total rupture area.Reassessment of the Maximum Fault Rupture Length ofFault Rupture Length of Strike-Slip Earthquakes and Inference on M max in the Anatolian Peninsula,Turkey.Seismol.Res.Lett.,86 (3),890-900,doi 10.1785/0220140252 Reassessment of the Maximum Fault Rupture Length of Strike-Slip Earthquakes and Inference onRelated searches for inferring fault strength from earthquaearthquake rupturefault rupture12345Next

Repeating earthquakes record fault weakening and healing

Repeating earthquakes (REs) rupture the same fault patches at different times allowing temporal variations in the mechanical behavior of specific areas of the fault to be interrogated over the earthquake cycle.We study REs that reveal fault weakening after a large megathrust earthquake in Costa Rica,followed by fault recovery.We find shorter RE recurrence intervals and larger slip areas Rupture-dependent breakdown energy in fault modelsRupture-dependent breakdown energy in fault models with thermo-hydro-mechanical processes Valère Lambert 1 and Nadia Lapusta 1,2 1 Seismological Laboratory,California Institute of Technology,Pasadena,CA 91125,USA 2 Department of Mechanical and Civil Engineering,California Institute of Technology,Pasadena,CA 91125,USA Correspondence Valère Lambert ([email protected])The motion- and scale-dependence of rupture prestress and Using numerical simulations of earthquake sequences on rate-and-state faults with enhanced dynamic weakening due to thermal pressurization of pore fluids,we demonstrate that the average shear stress that a fault can sustain before rupture - a measure of fault strength - decreases as the total rupture size increases,becoming much smaller than the local shear stress required for nucleation.

The strength of earthquake-generating faults Journal of

The use of the dips of dip-slip earthquake fault planes to estimate fault strength is controversial.The optimal dip angle at which a fault is formed,or reactivated,depends upon the coefficient of friction of the rocks,and is unaffected by the pore fluid pressure (although this will affect the absolute magnitude of the stress at which