T54C:
Subduction Zone Earthquakes and the Role of Asperities in Rupture Propagation and Aftershock Sequences: Insights from the 16 April 2016 Pedernales, Ecuador Earthquake II

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Session ID#: 16025

Session Description:
On April 16, 2016 the subduction zone offshore Ecuador ruptured in a Mw 7.8 earthquake just north of the intersection of the Carnegie Ridge with the trench, a region of increased interseismic coupling as measured by GPS. The event is the largest earthquake in Ecuador since a similar portion of the subduction zone ruptured in 1942. The subduction zone adjacent to and north of the Carnegie Ridge has ruptured on decadal time scales in Mw 7.7-7.8 events, and a Mw 8.8 event in 1906. Increases in observational capabilities provide new opportunities to study the role of asperities in focusing stress, promoting and/or inhibiting rupture propagation, and the role of slow slip events in the earthquake cycle. We invite submissions from a range of disciplines on the Pedernales earthquake, seismicity and deformation along the subduction system in Ecuador and adjacent regions, and the role of asperities in subduction zone earthquakes.
Primary Convener:  Anne Meltzer, Lehigh University, Earth and Environmental Sciences, Bethlehem, PA, United States
Conveners:  Hugo A Yepes, Instituto Geofísico de la Escuela Politécnica Nacional, Quito, Ecuador, Jean Mathieu Nocquet, Institut de Recherche pour le Développement - IRD, Valbonne, France and Hiroyuki Kumagai, Nagoya University, Nagoya, Japan
Chairs:  Anne Meltzer, Lehigh University, Earth and Environmental Sciences, Bethlehem, PA, United States, Yvonne Font, Université Côte d’Azur, IRD, Observatoire de la Côte d'Azur, CNRS, Géoazur, Valbonne, France and Robert Porritt, University of Arizona, Tucson, AZ, United States
OSPA Liaison:  Anne Meltzer, Lehigh University, Earth and Environmental Sciences, Bethlehem, PA, United States

Cross-Listed:
  • G - Geodesy
  • NH - Natural Hazards
  • S - Seismology
Index Terms:

8104 Continental margins: convergent [TECTONOPHYSICS]
8118 Dynamics and mechanics of faulting [TECTONOPHYSICS]
8123 Dynamics: seismotectonics [TECTONOPHYSICS]
8170 Subduction zone processes [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Links Between Earthquake Characteristics and Subducting Plate Heterogeneity in the 2016 Pedernales Ecuador Earthquake Rupture Zone (Invited) (126773)
Susan L Bilek, New Mexico Institute of Mining and Technology, Earth and Environmental Science, Socorro, United States
Early Afterslip of the 2015 Mw8.2 Illapel, Chile Megathrust Earthquake: Overlapping Slip Regions Challenge the Fixed Asperity Model (122764)
William D Barnhart1, Jessica R Murray2, Richard W Briggs3, Francisco G Gomez4, Charles Miles5, Jerry L Svarc6, Sebastian Riquelme7 and Bryan Stressler1, (1)University of Iowa, Iowa City, IA, United States, (2)USGS Western Regional Offices Menlo Park, Menlo Park, United States, (3)USGS Central Region Offices Denver, Denver, CO, United States, (4)Organization Not Listed, Washington, DC, United States, (5)University of Missouri Columbia, Columbia, MO, United States, (6)California Geological Survey Menlo Park, Menlo Park, CA, United States, (7)University of Chile, National Seismological Center, Santiago, Chile
2016 Ecuador earthquake and rupture mode along the Ecuador-Colombia subduction zone (143347)
Hiroyuki Kumagai1, Masahiro Yoshimoto2, Wilson Acero3, Gabriela Ponce3, Freddy Vasconez4, Santiago Arrais3, Mario Calixto Ruiz5, Alexandra Alvarado5, Patricia Pedraza6, Viviana Dionicio7, Orland Chamorro6, Yuta Maeda8 and Masaru Nakano9, (1)Nagoya University, Nagoya, Japan, (2)Nagoya University, Furo-Cho,Chikusa-Ku,, Japan, (3)Instituto Geofisico EPN - Ecuador, Quito, Ecuador, (4)Instituto Geofísico de la Escuela Politécnica Nacional, Quito, Ecuador, (5)Instituto Geofísico, Escuela Politécnica Nacional, Quito, Ecuador, (6)Servicio Geológico Colombiano, Bogotá, Red Sismológica Nacional de Colombia, Bogotá D.C., Colombia, (7)Servicio Geológico Colombiano, Red Sismológica Nacional de Colombia, Bogotá, Colombia, (8)Nagoya University, Graduate School of Environmental Studies, Nagoya, Japan, (9)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan
Abnormal high seismic moment release rate along the Ecuador-Colombia subduction zone (164119)
Jean Mathieu Nocquet1,2, Martin Vallée3, Hugo A Yepes2, Anthony Sladen4, Paul Jarrin5 and Frederique Rolandone1,6, (1)Institut de Recherche pour le Développement - IRD, Valbonne, France, (2)Instituto Geofísico de la Escuela Politécnica Nacional, Quito, Ecuador, (3)Université de Paris, Institut de physique du globe de Paris, Paris, France, (4)GeoAzur, Valbonne, France, (5)Instituto Geofísico, Escuela Politécnica Nacional, Quito, Ecuador, (6)Sorbonne Universités, UPMC Université Paris 06, CNRS, ISTeP, Paris, France
Multi-data analysis of the rupture process of the 2016 Pedernales earthquake (173223)
Martin Vallée1, Paul Jarrin2, Jean Mathieu Nocquet3, Patricia A Mothes4, Raphael Grandin5, Frederique Rolandone6, Bertrand Delouis7, Hugo A Yepes3, Gabriela Ponce8, Yvonne Font9, Dario Fuentes2, Marc M Regnier10, Aurore Laurendeau11, David Cisneros12, Stephen Hernandez13, Anthony Sladen14, Juan Carlos Singaucho3, Héctor Mora-Páez15, Juan Gomez12, Luis Montes12, Alexandra Alvarado16, Mario Calixto Ruiz2 and Philippe Charvis17, (1)Université de Paris, Institut de physique du globe de Paris, Paris, France, (2)Instituto Geofísico, Escuela Politécnica Nacional, Quito, Ecuador, (3)Instituto Geofísico de la Escuela Politécnica Nacional, Quito, Ecuador, (4)National Polytecnical School, Instituto Geofisico, Quito, Ecuador, (5)Université de Paris Cité, Institut de Physique du Globe de Paris, CNRS, Paris, France, (6)Sorbonne Universités, UPMC Université Paris 06, CNRS, ISTeP, Paris, France, (7)Université Côte d’Azur, IRD, CNRS, Observatoire de la Côte d’Azur, Géoazur, 250 rue Albert Einstein, 06560 Valbonne, France, Valbonne, France, (8)Instituto Geofisico EPN - Ecuador, Quito, Ecuador, (9)Université Côte d’Azur, IRD, CNRS, Observatoire de la Côte d’Azur, Géoazur, Valbonne, France, (10)Géoazur - Université Côte d'Azur - IRD - CNRS - Observatoire de la côte d'Azur, Valbonne, France, (11)IRSN Institut de Radioprotection et de Sûreté Nucléaire, Fontenay Aux Roses Cedex, France, (12)Instituto Geográfico Militar, Quito, Ecuador, (13)Escuela Politécnica Nacional, Instituto Geofísico, Quito, Ecuador, (14)Géoazur - CNRS, Sophia-Antipolis, France, (15)Servicio Geológico Colombiano, Bogota, Colombia, (16)Organization Not Listed, Washington, DC, United States, (17)Géoazur - Université Côte d'Azur, IRD, CNRS, OCA, Valbonne, France
Resolving Seismic Locations and Ground Deformation from Coseismic and Large Aftershock InSAR Images of the 2016 Pedernales Ecuador Earthquake Sequence (149083)
Kevin B Kwong1, Jin Woo Kim2, Zhong Lu2 and Heather DeShon3, (1)Southern Methodist University, Dallas, United States, (2)Southern Methodist University, Roy M. Huffington Department of Earth Sciences, Dallas, TX, United States, (3)Southern Methodist University, Roy Huffington Department of Earth Sciences, Dallas, TX, United States
Identification of the ground deformation associated with the earthquake of April 16 Pedernales – Ecuador (Invited) (166790)
Alexandra Alvarado1, Laurence Audin2, Marianne Saillard3, Pedro Espín4, Jean-Luc Le Pennec5, Hernandez Maria Jose6, James Hollingsworth7, Johann Champenois8 and Jorge Aguilar4, (1)Instituto Geofísico, Escuela Politécnica Nacional, Quito, Ecuador, (2)IRD, CNRS, Université Grenoble Alpes, ISTerre, Grenoble, France, (3)Université Côte d’Azur, IRD, CNRS, Observatoire de la Côte d’Azur, Géoazur, Valbonne, France, (4)Instituto Geofísico, Escuela Politécnica Nacional, Volcanología, Quito, Ecuador, (5)University Blaise Pascal Clermont-Ferrand II, Clermont-Ferrand, France, (6)Escuela Politécnica Nacional, Departamento de Geologia, Quito, Ecuador, (7)Institut des Sciences de la Terre, Université Grenoble Alpes, Grenoble, France, (8)Instituto Geofísico de la Escuela Politécnica Nacional, Quito, Ecuador
The 16 April 2016, Mw 7.8 Ecuador earthquake: a quasi-repeater of the 1942 Ms 7.5 earthquake and partial re-rupture of the 1906 Ms 8.6 Colombia-Ecuador earthquake (124091)
Thorne Lay1, Lingling Ye2, Hiroo Kanamori2, Jean-Philippe Avouac3, Linyan Li4 and Kwok Fai Cheung4, (1)University of California Santa Cruz, Santa Cruz, United States, (2)California Institute of Technology, Pasadena, CA, United States, (3)California Institute of Technology, Seismological Laboratory, Division of Geological and Planetary Sciences, Pasadena, CA, United States, (4)University of Hawaii at Manoa, Ocean and Resources Engineering, Honolulu, HI, United States

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