S51G:
Subduction Zone Structure and Interplate Slip Along the Pacific Margin of South America I

Submit an Abstract to this Session



Session ID#: 32852

Session Description:
Many subduction-related parameters, such as incoming plate age, roughness, and sediment thickness, thought to control earthquake generation and slip behavior are found along the ~6500-km long Nazca/South America plate boundary, making this margin a natural laboratory for comparative studies. Furthermore, there is a rich historic record of earthquake activity extending back to ~1500 AD, with 9 earthquakes of Mw≥7.6 since 2000 that have been well recorded by modern seismological and geodetic instrumentation. This enables detailed studies of the relationship between Earth structure, seismic and aseismic slip, and earthquake nucleation, propagation and segmentation. We invite contributions from the broad range of disciplines that contribute to understanding earthquake processes along the Pacific margin of South America, including studies related to the Mw7.8 2016 Ecuador earthquake, recent controlled-source experiments along the Chilean margin, and advances in geodetic monitoring of the subduction zone.
Primary Convener:  Anne M Trehu, Oregon State University, CEOAS, Corvallis, United States; Oregon State Univ, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States
Conveners:  Heidrun Kopp, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, Diana Comte, Universidad de Chile, AMTC FCFM, Santiago, Chile and Hans Agurto-Detzel, Géoazur - Université Nice Sophia Antipolis, Valbonne, France
Chairs:  Hans Agurto-Detzel, Géoazur - Université Nice Sophia Antipolis, Université Côte d'Azur, IRD, CNRS, OCA, Valbonne, France and Anne M Trehu, Oregon State Univ, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States
OSPA Liaison:  Anne M Trehu, Oregon State Univ, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States

Cross-Listed:
  • G - Geodesy
  • NH - Natural Hazards
  • T - Tectonophysics
Index Terms:

1209 Tectonic deformation [GEODESY AND GRAVITY]
4302 Geological [NATURAL HAZARDS]
7215 Earthquake source observations [SEISMOLOGY]
8123 Dynamics: seismotectonics [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Frictional contrast controls timing and great earthquakes in southern Chile (Invited) (268565)
Marcos Moreno1, Shaoyang Li1, Daniel Melnick2, Jonathan R. Bedford1, Juan Carlos CARLOS Baez Sr3, Mahdi Motagh1, Sabrina Metzger1, Sanaz Vajedian1, Christian Sippl1, Eduardo Contreras-Reyes4, Benjamin D. Gutknecht5 and Onno Oncken1, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (2)Universidad Austral de Chile, Valdivia, Chile, (3)University of Chile, Geophysics, Santiago, Chile, (4)University of Chile, Santiago, Chile, (5)Dresden University of Technology, Dresden, Germany
Extensive Sediment Subduction along the South-Central Chile Margin and its Role in the Maule and Valdivia Megathrust Earthquakes (Invited) (276069)
Nathan L Bangs, University of Texas Institute for Geophysics, Austin, United States, Adrien F Arnulf, Institute for Geophysics, Austin, United States, Anne M Trehu, Oregon State Univ, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States, Eduardo Contreras-Reyes, University of Chile, Santiago, Chile and CEVICHE Science Party
Continuous forearc extension following the 2010 Maule megathrust earthquake: InSAR and seismic observations and modelling (231797)
Lidong Bie, University of Liverpool, Liverpool, L69, United Kingdom, Andreas Rietbrock, Karlsruhe Institute of Technology, Geophysical Institute, Karlsruhe, Germany and Hans Agurto-Detzel, Géoazur - Université Nice Sophia Antipolis, Université Côte d'Azur, IRD, CNRS, OCA, Valbonne, France
The rigid Andean sliver hypothesis challenged : impact on interseismic coupling on the Chilean subduction zone (217343)
Marianne Metois, LGLTPE Laboratoire de Géologie de Lyon : Terre, Planètes et Environnement, Villeurbanne Cedex, France
Aftershock Distribution of the Mw=7.8 April 16, 2016 Pedernales Ecuador Subduction Earthquake: Constraints from 3D Earthquake Locations (256691)
Yvonne Font1, Hans Agurto-Detzel2, Alexandra Alvarado3, Marc M Regnier4, Frederique Rolandone5, Philippe Charvis6, Patricia A Mothes7, Jean Mathieu Nocquet8, Paul Jarrin9, David Ambrois1, Christophe Maron2, Anne Deschamps2, Jerome Cheze1, Fabrice Peix Sr1, Mario Calixto Ruiz9, Gabriela Ponce10, Wilson Acero10, Juan Carlos Singaucho11, Cristian Viracucha3, Freddy Vasconez3, Louis De Barros2, Diego Mercerat12, Francoise Courboulex13, Audrey Galve14, Maxime Godano2, Tony Monfret1, Cristina Ramos3, Xavier Martin2, Andreas Rietbrock15, Susan L Beck16 and Anne Metlzer17, (1)Université Côte d’Azur, IRD, CNRS, Observatoire de la Côte d’Azur, Géoazur, Valbonne, France, (2)Géoazur - Université Nice Sophia Antipolis, Université Côte d'Azur, IRD, CNRS, OCA, Valbonne, France, (3)Instituto Geofísico de la Escuela Politécnica Nacional, Quito, Ecuador, (4)Géoazur - Université Côte d'Azur - IRD - CNRS - Observatoire de la côte d'Azur, Valbonne, France, (5)ISTeP Institut des Sciences de la Terre de Paris, Paris Cedex 05, France, (6)Géoazur - Université Côte d'Azur, IRD, CNRS, OCA, Valbonne, France, (7)Instituto Geofisico, Quito, Ecuador, (8)Institut de Recherche pour le Développement - IRD, Valbonne, France, (9)Instituto Geofísico, Escuela Politécnica Nacional, Quito, Ecuador, (10)Instituto Geofisico EPN - Ecuador, Quito, Ecuador, (11)Sioux Falls, SD, United States, (12)CEREMA, Laboratoire de Nice, Nice, France, (13)GeoAzur, Valbonne, France, (14)Université Côte d'Azur, OCA, CNRS, UPMC, IRD, Géoazur, Valbonne, France, (15)Karlsruhe Institute of Technology, Geophysical Institute, Karlsruhe, Germany, (16)University of Arizona, Department of Geosciences, Tucson, AZ, United States, (17)Lehigh University, Bethlehem, United States
An Overview of Seismic Observations Along the Pacific Margin of South America: Opportunities for the SZ4D Initiative (261958)
Robert Woodward, Incorporated Research Institutions for Seismology, Washington, DC, United States, Andrew Frassetto, Incorporated Research Institutions for Seismology, Seattle, United States and Anne Meltzer, Lehigh University, Earth and Environmental Sciences, Bethlehem, PA, United States

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