Fault slip may involve slow aseismic creep and fast seismic rupture, radiating seismic waves manifested as earthquakes. These two complementary behaviors accommodate the long-term plate convergence of major subduction zones and are attributed to fault frictional properties. It is conventionally assumed that zones capable of seismic rupture on the subduction megathrust are confined to between about 10 to 50 km depth; however, the actual spatiotemporal distribution of fault mechanical parameters remains elusive for most subduction zones. The 2011 Tohoku M-w 9.0 earthquake ruptured with >50 m slip up to the trench, thus challenging this conventional assumption, and provides a unique opportunity to probe the mechanical properties of the Japan subduction zone. Drawing on the inferred distribution of coseismic and postseismic slip, it has recently been suggested that portions of the megathrust are capable of switching between seismic and aseismic behavior. Kinematic models of the coseismic rupture and 15-month postseismic afterslip of this event suggest that the coseismic rupture triggered widespread frictional afterslip with equivalent moment magnitude of 8.17-8.53, in addition to viscoelastic relaxation in the underlying mantle. The identified linear relation between modeled afterslip, slip inferred from repeating earthquakes on the plate interface, and the cumulative number of aftershocks within 15 km distance of the subduction thrust suggests that most aftershocks are a direct result of afterslip. We constrain heterogeneous rate-state friction parameters of the subduction thrust from the computed coseismic stress changes and afterslip response. Our results indicate a variable pattern along dip and strike, characterizing areas down-dip and south of the main rupture zone as having velocity-strengthening properties. In agreement with seismic tomographic models of plate boundary elastic properties and geologic evidence for previous M > 8.5 megathrust earthquakes on this section of the plate boundary, we suggest that the obtained pattern of the frictional properties is characteristic of subducted material and thus persistent in time and space. (C) 2014 Elsevier B.V. All rights reserved.
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Instituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima
IRD, Université de Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, 250 rue A. Einstein, ValbonneInstituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima
Villegas-Lanza J.C.
Nocquet J.-M.
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IRD, Université de Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, 250 rue A. Einstein, ValbonneInstituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima
Nocquet J.-M.
Rolandone F.
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Sorbonne Universités, Institut des Sciences de la Terre de Paris, 4 Place Jussieu, ParisInstituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima
Rolandone F.
Vallee M.
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Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris-CedexInstituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima
Vallee M.
Tavera H.
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Instituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-LimaInstituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima
Tavera H.
Bondoux F.
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Geósciences Environnement Toulouse, Université Paul Sabatier, CNRS, ToulouseInstituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima
Bondoux F.
Tran T.
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IRD, Université de Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, 250 rue A. Einstein, Valbonne
National University of Civil Engineering, 55 Giai Phong Road, Hai Ba Trung District, HanoiInstituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima
Tran T.
Martin X.
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IRD, Université de Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, 250 rue A. Einstein, ValbonneInstituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima
Martin X.
Chlieh M.
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IRD, Université de Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, 250 rue A. Einstein, ValbonneInstituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima
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Inst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, Peru
Univ Nice Sophia Antipolis, Geoazur, IRD, Observ Cote Azur,CNRS, 250 Rue A Einstein, F-06560 Valbonne, FranceInst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, Peru
Villegas-Lanza, J. C.
Nocquet, J. -M.
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Univ Nice Sophia Antipolis, Geoazur, IRD, Observ Cote Azur,CNRS, 250 Rue A Einstein, F-06560 Valbonne, FranceInst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, Peru
Nocquet, J. -M.
Rolandone, F.
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Univ Paris 06, Sorbonne Univ, CNRS, Inst Sci Terre Paris ISTeP, 4 Pl Jussieu, F-75005 Paris, FranceInst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, Peru
Rolandone, F.
Vallee, M.
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Univ Paris Diderot, Sorbonne Paris Cite, Inst Phys Globe Paris, CNRS,UMR 7154, F-75238 Paris 05, FranceInst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, Peru
Vallee, M.
Tavera, H.
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Inst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, PeruInst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, Peru
Tavera, H.
Bondoux, F.
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Univ Toulouse 3, IRD, Geosci Environm Toulouse, Observ Midipyrenees,CNRS, F-31400 Toulouse, FranceInst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, Peru
Bondoux, F.
Tran, T.
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Univ Nice Sophia Antipolis, Geoazur, IRD, Observ Cote Azur,CNRS, 250 Rue A Einstein, F-06560 Valbonne, France
Natl Univ Civil Engn, 55 Giai Phong Rd, Hanoi, VietnamInst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, Peru
Tran, T.
Martin, X.
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Univ Nice Sophia Antipolis, Geoazur, IRD, Observ Cote Azur,CNRS, 250 Rue A Einstein, F-06560 Valbonne, FranceInst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, Peru
Martin, X.
Chlieh, M.
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Univ Nice Sophia Antipolis, Geoazur, IRD, Observ Cote Azur,CNRS, 250 Rue A Einstein, F-06560 Valbonne, FranceInst Geofis Peru, Urbanizac Mayorazgo Etapa 4, Calle Badajoz 169, Lima 15012 03, Peru