T22C:
Role of Preexisting Structures on Plate Deformation in Continental Rifting and Subduction Zones

Submit an Abstract to this Session



Session ID#: 31687

Session Description:
This session seeks to discuss the current state of knowledge of plate deformation in continental rifting and subduction zones as affected by the presence of pre-existing structures. Studies have shown how strain is accommodated along pre-existing structures, and how geological hazards are localized where the older structures are present. Other studies have shown how pre-existing structures are not important in the formation of new faults. Understanding the effects of these older structures are important to comprehend seismic hazards, plate kinematics, initiation and evolution of continental rifting, subduction initiation, and strain partitioning in subduction zones. We seek contributions that use geophysical (seismic, geodetic, remote sensing, potential fields), numerical and/or analog modeling, and geological techniques to understand strain accommodation, geologic hazards, subduction processes, deformation history, and plate kinematics, as affected by pre-existing structures. This session also encourages contributions on future research directions on strain accommodation on continental rifting and subduction zones.
Primary Convener:  Daniel A Laó-Dávila, Oklahoma State University Main Campus, Stillwater, OK, United States
Conveners:  Estella A Atekwana, Oklahoma State University Main Campus, Stillwater, OK, United States and Mohamed Abdelsalam, Oklahoma State University Main Campus, Boone Pickens School of Geology, Stillwater, OK, United States
Chairs:  Daniel A Laó-Dávila, Oklahoma State University Main Campus, Stillwater, OK, United States, Estella A Atekwana, Oklahoma State University, Boone Pickens School of Geology, Stillwater, OK, United States and Mohamed Abdelsalam, Oklahoma State University Main Campus, Boone Pickens School of Geology, Stillwater, OK, United States
OSPA Liaison:  Daniel A Laó-Dávila, Oklahoma State University Main Campus, Stillwater, OK, United States

Cross-Listed:
  • G - Geodesy
  • NH - Natural Hazards
  • NS - Near Surface Geophysics
  • S - Seismology
Index Terms:

8109 Continental tectonics: extensional [TECTONOPHYSICS]
8158 Plate motions: present and recent [TECTONOPHYSICS]
8159 Rheology: crust and lithosphere [TECTONOPHYSICS]
8170 Subduction zone processes [TECTONOPHYSICS]

Abstracts Submitted to this Session:

The influence of inherited structures on magmatic and amagmatic processes in the East African Rift. (Invited) (210225)
Juliet Biggs, University of Bristol, COMET, School of Earth Sciences, Bristol, BS8, United Kingdom, Ryan Lloyd, COMET, Bristol, United Kingdom, Michael Hodge, Cardiff University, School of Earth and Ocean Sciences, Cardiff, CF24, United Kingdom, Elspeth Robertson, University of Bristol, Bristol, United Kingdom, Matthew Wilks, University of Bristol, York, United Kingdom, Ake Fagereng, Cardiff University, Cardiff, CF24, United Kingdom, J Michael Kendall, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, Hassan S. Mdala, Geological Survey of Malawi, Zomba, Malawi, Elias Lewi, Addis Ababa University, IGSSA, Addis Ababa, Ethiopia and Atalay Ayele Wondem, Addis Ababa University, Institute of Geophysics, Space Science, and Astronomy, Addis Ababa, Ethiopia
Fault-scale controls on rift geometry: the Bilila-Mtakataka Fault, Malawi (231065)
Michael Hodge, Cardiff University, School of Earth and Ocean Sciences, Cardiff, CF24, United Kingdom, Ake Fagereng, Cardiff University, Cardiff, CF24, United Kingdom, Juliet Biggs, University of Bristol, COMET, School of Earth Sciences, Bristol, United Kingdom and Hassan S. Mdala, Geological Survey of Malawi, Zomba, Malawi
The Relationships of Subparallel Synthetic Faults and Pre-existing Structures in the Central Malawi Rift (280477)
Steven Johnson1, Kimberly Mendez2, Stephen Caleb Mark Beresh1, William Garland Mynatt1, Emily Anne Elifritz3, Daniel A Laó-Dávila4, Estella A Atekwana5, Mohamed Abdelsalam1, Patrick Rafiki N Chindandali6, Chikondi Chisenga7, Steven Gondwe7, Mathew Mkumbura8, Dickson Kalaguluka8, Leonard Kalindekafe9 and Jalf Salima10, (1)Oklahoma State University, Stillwater, OK, United States, (2)University of Puerto Rico, Mayaguez, United States, (3)Oklahoma State University Main Campus, Boone Pickens School of Geology, Stillwater, OK, United States, (4)Oklahoma State University, Boone Pickens School of Geology, Stillwater, OK, United States, (5)University of California Davis, Department of Earth & Planetary Sciences, Davis, CA, United States, (6)Northern Arizona University, School of Earth and Sustainability, Flagstaff, AZ, United States, (7)Malawi University of Science and Technology, Geology, Limbe, Malawi, (8)Malawi University of Science and Technology, Limbe, Malawi, (9)Munich, Germany, (10)Geological Survey of Malawi, Zomba, Malawi
Deep crustal structures in the northern North Sea rift: observations from new 3-D seismic reflection data (239210)
Thilo Wrona1, Haakon Fossen2, Robert Gawthorpe1, Jan Inge Faleide3 and Marit Stokke Bauck4, (1)University of Bergen, Department of Earth Science, Bergen, Norway, (2)Univ Bergen, Bergen, Norway, (3)Center for Earth Evolution and Dynamics (CEED), Oslo, Norway, (4)University of Oslo, Oslo, Norway
Influence of pre-existing rift faults during the development of an overlying fault network, northern Browse Basin, NW Australia (288717)
Casey W Nixon, Eirik Wiese and Robert Gawthorpe, University of Bergen, Department of Earth Science, Bergen, Norway
Lithospheric Controls on the Distribution of Volcanoes in Mariana Arc (252557)
Harisma Andikagumi1, Colin Macpherson2 and Kenneth J W McCaffrey2, (1)University of Durham, Durham, United Kingdom, (2)University of Durham, Department of Earth Sciences, Durham, United Kingdom
Three-dimensional structure and seismicity beneath the Central Vanuatu subduction zone (228711)
Oceane Foix, Institut de Physique du Globe de Paris, Paris, France, Wayne C Crawford, Institut de Physique du Globe de Paris (IPGP), CNRS & Université Paris Cité, Paris, France, Ivan Koulakov, A.A. Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia, Marc M Regnier, Géoazur - Université Côte d'Azur - IRD - CNRS - Observatoire de la côte d'Azur, Valbonne, France, Bernard Pelletier, IRD, Nouméa, New Caledonia and Esline Garaebiti, Vanuatu Meteorology and Geohazards Department, Port Vila, Vanuatu

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