Seismo-hydro-mechanical modelling of the seismic cycle: Methodology and implications for subduction zone seismicity

2020 ◽  
Vol 791 ◽  
pp. 228504 ◽  
Author(s):  
Claudio Petrini ◽  
Taras Gerya ◽  
Viktoriya Yarushina ◽  
Ylona van Dinther ◽  
James Connolly ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Seismic Cycle ◽  
Mechanical Modelling

Relationships between deformation and morphology of forearc wedges and earthquake ruptures

2021 ◽  
Author(s):  
Nadaya Cubas
Keyword(s):  
Subduction Zones ◽  
Permanent Deformation ◽  
Seismic Cycle ◽  
Earthquake Rupture ◽  
Earthquake Ruptures ◽  
Mechanical Modelling ◽  
Seismic Behaviors ◽  
Deformation Patterns ◽  
Rupture Properties ◽  
Effective Friction

<p>Over the last decade, we have accumulated evidence that, along subduction zones, a significant part of the seismic cycle deformation is permanently acquired by the medium and reflects the variation of rupture properties along the megathrust. Assuming a persistence of the megathrust segmentation over several hundred thousand years, this permanent deformation and the forearc topography could thus reveal the mechanics of the megathrust. Numerous recent studies have also shown that the megathrust effective friction appears to differ significantly between aseismic or seismic areas. From mechanical modelling, I will first discuss how such differences in effective friction are significant enough to induce wedge segments with varying morphologies and deformation patterns. I will present examples from different subduction zones characterized by either erosive or accretionary wedges, and by different seismic behaviors. Secondly, I will present how this long-lived deformation can in turn control earthquake ruptures. I will show, that along the Chilean subduction zone, all recent mega-earthquakes are surrounded by basal erosion and underplating. Therefore, the deformation and morphology of forearcs would both be partly linked to the megathrust rupture properties and should be used in a more systematic manner to improve earthquake rupture prediction.</p>

Deep crustal fracture zones control fluid escape and the seismic cycle in the Cascadia subduction zone

2017 ◽  
Vol 460 ◽  
pp. 1-11 ◽  
Author(s):  
Benoît Tauzin ◽  
Bruno Reynard ◽  
Jean-Philippe Perrillat ◽  
Eric Debayle ◽  
Thomas Bodin
Keyword(s):  
Subduction Zone ◽  
Cascadia Subduction Zone ◽  
Seismic Cycle ◽  
Fracture Zones ◽  
Control Fluid

scholarly journals Crustal deformation and fault slip during the seismic cycle in the North Chile subduction zone, from GPS and InSAR observations

2004 ◽  
Vol 158 (2) ◽  
pp. 695-711 ◽  
Author(s):  
M. Chlieh ◽  
J. B. de Chabalier ◽  
J. C. Ruegg ◽  
R. Armijo ◽  
R. Dmowska ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Crustal Deformation ◽  
Fault Slip ◽  
Seismic Cycle ◽  
The North

scholarly journals Seismic hazard of the western Makran subduction zone: Insight from mechanical modelling and inferred frictional properties

2021 ◽  
Vol 562 ◽  
pp. 116789
Author(s):  
Sepideh Pajang ◽  
Nadaya Cubas ◽  
Jean Letouzey ◽  
Laëtitia Le Pourhiet ◽  
Seyedmohsen Seyedali ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Subduction Zone ◽  
Makran Subduction Zone ◽  
Frictional Properties ◽  
Mechanical Modelling

scholarly journals D�j� Vu: Understanding Subduction Zones’ Cycle of Seismicity

Eos ◽  
2019 ◽  
Vol 100 ◽  
Author(s):  
Terri Cook
Keyword(s):  
Subduction Zone ◽  
Subduction Zones ◽  
Surface Deformation ◽  
Geodetic Data ◽  
Seismic Cycle ◽  
Data Set ◽  
Nankai Subduction Zone

A unique geodetic data set from Japan’s Nankai subduction zone offers an unparalleled opportunity to study surface deformation spanning almost an entire seismic cycle.

Influence of Regional Tectonic and Rheological Structure on the Seismic Cycle for Northeast Japan

2021 ◽  
Author(s):  
Irina Vladimirova ◽  
Yurii Gabsatarov ◽  
Grigory Steblov ◽  
Leopold Lobkovsky
Keyword(s):  
Subduction Zone ◽  
Tohoku Earthquake ◽  
Source Zone ◽  
Viscoelastic Relaxation ◽  
Seismic Cycle ◽  
Regional Tectonic ◽  
Japan Subduction Zone ◽  
Gnss Data ◽  
The Impact

<p>The subduction zone is a natural laboratory for studying the seismic cycle. On March 11, 2011, in the central part of the Japan subduction zone, the strongest Mw=9.0 Tohoku earthquake occurred, terminating a seismic cycle that lasted about 1200 years. We analyzed two decades of GNSS observations at 1400 GEONET stations to reveal the peculiarities of the tectonic and rheological structure of the Japan subduction zone which driven such a long-term seismic cycle. We consider GNSS data within the framework of a generalized approach, including the assessment of the coupling of the interplate interface before the earthquake, the construction of a model of the distributed displacement in the source zone, and the study of postseismic processes characterizing the relaxation of elastic stresses in the vicinity of the source.</p><p>As a result, we found that in the last year before the earthquake, there was an increase in the rates of elastic deformation of the continental margin and a corresponding increase in the interplate coupling. To study the process of the release of elastic energy during the Tohoku earthquake, we built a model of the distributed slip in the source. We used different earth models during inversion of GNSS data to study the impact of the regional tectonic and rheological structure and confirm the resilience of our inversion technique. We used GNSS data to build a model of pure afterslip in the first six months after the Tohoku earthquake and a model of afterslip combined with the short-term viscoelastic relaxation to estimate the relative contributions of these postseismic processes to the observed displacement field. Long-term postseismic time series of GNSS displacements were used to build the model of viscoelastic relaxation in the asthenosphere following the Tohoku earthquake. To estimate the transition time of the subduction zone to the steady-state of elastic stress accumulation we constructed a forecast of attenuation of viscoelastic stresses in the asthenosphere on the basis of our viscoelastic relaxation model.</p><p>We also studied the possible block structure of the Japanese Islands and its impact on the seismic cycle performing cluster analysis of GNSS displacement data at different stages of the seismic cycle.</p><p>This study was supported by the Russian Science Foundation (project 20–17-00140).</p>

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