T23C:
Geometry, Connectivity, and Dynamics of Fault Intersections and Stepovers II Posters


Session ID#: 7973

Session Description:
The recent occurrence of large (Mw >7) multifault earthquakes highlights the need to evaluate the potential for through-going ruptures at fault intersections and stepovers. Fault geometry and fault connectivity are important components of seismic hazard analysis because fault connectivity impacts the distribution of seismic sources, and because the three-dimensional geometry of faults affects the dynamics of fault rupture, slip, and ground motion. Details of 3D fault geometry at important intersections and stepovers is often lacking or poorly understood, limiting efforts to constrain the hazard in these areas. Our session intends to focus on geologic and geophysical studies of the 3D structure, mechanics, and dynamic modeling of fault intersections and stepovers with particular emphasis on seismic hazard implications. Special emphasis will be put on contributions that provide an integrated geologic and geophysical perspective along with a dynamic modeling component.
Primary Convener:  Janet Tilden Watt, USGS, Santa Cruz, CA, United States
Conveners:  Jeanne Hardebeck, U.S. Geological Survey, Earthquake Science Center, Moffett Field, United States, David Douglas Oglesby, University of California Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States and Michele L Cooke, University of Massachusetts Amherst, Earth, Geographic and Climate Sciences, Amherst, MA, United States
Chairs:  David Douglas Oglesby, University of California Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States and Janet Tilden Watt, USGS, Santa Cruz, CA, United States
OSPA Liaison:  Michele L Cooke, University of Massachusetts Amherst, Earth, Geographic and Climate Sciences, Amherst, MA, United States
Index Terms:

7230 Seismicity and tectonics [SEISMOLOGY]
8107 Continental neotectonics [TECTONOPHYSICS]
8118 Dynamics and mechanics of faulting [TECTONOPHYSICS]
8175 Tectonics and landscape evolution [TECTONOPHYSICS]

Abstracts Submitted to this Session:

Fault Growth and Interactions in a Multiphase Rift Fault Network: Horda Platform, Norwegian North Sea (82497)
Oliver B Duffy1, Rebecca E Bell2, Christopher Aiden-Lee Jackson3, Rob L Gawthorpe4, Casey Nixon4, David Jardin Sanderson5 and Paul S Whipp6, (1)University of Texas at Austin, Austin, TX, United States, (2)Imperial College London, Department of Earth Science and Engineering, London, United Kingdom, (3)Imperial College London, London, United Kingdom, (4)University of Bergen, Department of Earth Science, Bergen, Norway, (5)University of Southampton, Department of Ocean and Earth Sciences, Southampton, United Kingdom, (6)Statoil Norway Bergen, Bergen, Norway
Scaling Relations for the Thermal Structure of Segmented Oceanic Transform Faults (83625)
Monica Wolfson-Schwehr1, Margaret S Boettcher1 and Mark D Behn2, (1)University of New Hampshire Main Campus, Durham, NH, United States, (2)Woods Hole Oceanographic Institution, Geology and Geophysics, Woods Hole, MA, United States
An Exhumed Strike-Slip Duplex Formed at the Seismogenic Base of the Crust (68543)
Sean Matthew Hartman1, Scott R Paterson1 and Gregory J. Holk2, (1)University of Southern California, Los Angeles, CA, United States, (2)California State University Long Beach, Long Beach, CA, United States
Defining an Effective Damage Zone from the Topological Connectivity of Deformation Bands (86689)
Paul Edwards1, Sehyeon Gwon2, David Jardin Sanderson3 and Young-Seog Kim2, (1)Pukyong National University, Busan, Korea, Republic of (South), (2)Pukyong National University, Earth & Environmental Science, Busan, Korea, Republic of (South), (3)University of Southampton, Department of Ocean and Earth Sciences, Southampton, United Kingdom
Shoreline and Oceano Fault Zones’ Intersection Geometry, San Luis Obispo Bay, Offshore South Central Coastal California (75017)
Phillip J Hogan, Fugro Consultants, Inc., Ventura, CA, United States, Stuart P Nishenko, Pacific Gas and Electric Company, San Francisco, CA, United States, H. Gary Greene, Moss Landing Marine Laboratories, Geological Oceanography, Moss Landing, CA, United States, Bryan Bergkamp, Fugro GeoConsulting, Inc., Geosciences, Houston, TX, United States and Central Coastal California Seismic Imaging Project
3D insight into fault geometries, deformation, and fluid-migration within the Hosgri Fault Zone offshore central California: Results from high-resolution 3D seismic data (81370)
Jared Kluesner, U.S. Geological Survey, Santa Cruz, CA, United States, Daniel S Brothers, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, United States, Samuel Y Johnson, Pacific Science Center, Seattle, WA, United States and Janet Tilden Watt, USGS, Pacific Coastal and Marine Science Center, Santa Cruz, CA, United States
Moderately-dipping California Strike-slip Faults With Bends in map View and Cross-section (72777)
Christopher C Sorlien, University of California Santa Barbara, Earth Research Institute, Santa Barbara, CA, United States, Marie-Helene Cormier, University of Rhode Island, Graduate School of Oceanography, Narragansett, RI, United States, Craig Nicholson, University of California Santa Barbara, Santa Barbara, CA, United States, Mark Legg, Legg Geophysical, Huntington Beach, CA, United States, Richard J Behl, California State University Long Beach, Long Beach, CA, United States and Leonardo Seeber, Lamont-Doherty Earth Obs, Palisades, United States
Local Thrust Faulting Along the Southern Hayward Fault in Fremont, California (65559)
Philip L Johnson and Ted M. Sayre, Cotton, Shires and Associates, Los Gatos, CA, United States
Potential for Large Transpressional Earthquakes along the Santa Cruz-Catalina Ridge, California Continental Borderland (84927)
Mark Legg, Legg Geophysical, Huntington Beach, CA, United States, Monica D Kohler, California Institute of Technology, Pasadena, United States, Dayanthie S Weeraratne, California State University Northridge, Northridge, CA, United States and Chris M Castillo, Castillo Geophysical Ltd., Reno, NV, United States
Retrodeformation of a 3D Geologic Model of the Santa Cruz Mountains West of the San Andreas Fault (77276)
Curtis William Baden, Stanford Earth Sciences, Stanford, CA, United States, George E Hilley, Stanford University, Earth and Planetary Sciences, Stanford, United States and Jeremy K Hourigan, UC Santa Cruz, Santa Cruz, CA, United States
Investigation on the jump distance of the strike-slip step overs based on the 3D dynamic rupture simulations (69174)
Feng Hu, University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China, Xiaofei Chen, University of Science and Technology of China, Hefei, China and Zhenguo Zhang, Univ. of Sci. & Tech. of China, Hefei, China
Three Dimensional Analysis of Fault Interaction along a Simple Pull-Apart Basin (69106)
Amir Sagy and Yariv Hamiel, Geological Survey of Israel, Jerusalem, Israel
Predicting the evolution of the extensional step-over in the San Pablo bay area with work optimization (79274)
Michele L Cooke, University of Massachusetts Amherst, Earth, Geographic and Climate Sciences, Amherst, MA, United States, Jessica McBeck, University of Olso, Oslo, Norway and Elizabeth H Madden, University of Massachusetts Amherst, Amherst, United States
Detailed Geophysical Imaging in San Pablo Bay Reveals a New Strand of the Hayward-Rodgers Creek Fault Zone (67674)
Janet Tilden Watt1, David A Ponce2, Patrick E Hart3, Kevin M Denton4, Tom Parsons4 and Russell Walter Graymer4, (1)U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, United States, (2)USGS California Water Science Center Menlo Park, Menlo Park, CA, United States, (3)Pacific Coastal and Marine Science Center Santa Cruz, Santa Cruz, CA, United States, (4)U.S. Geological Survey, Menlo Park, CA, United States
Finite Element Stress Model of a Strike-Slip Duplex: A Case Study from Southern Chile (83831)
Pablo Cristián Iturrieta1, Daniel Hurtado1, Jose M Cembrano1, Cristobal Valderrama1 and Ashley Stanton-Yonge2, (1)Pontifical Catholic University of Chile, Santiago, Chile, (2)University College London, Earth Sciences, London, United Kingdom
Modeling Releasing Steps of Strike-Slip Fault Systems: Implications for Conflicting Estimates of Long-Term Slip Rates (70729)
Phillip G Resor, Wesleyan University, Middletown, CT, United States, Michele L Cooke, University of Massachusetts Amherst, Earth, Geographic and Climate Sciences, Amherst, MA, United States, Elizabeth H Madden, University of Massachusetts Amherst, Amherst, United States and Scott T Marshall, Appalachian State University, Department of Geological and Environmental Sciences, Boone, NC, United States
Interaction between compressional and transcurrent structures: insights from the Sicilian Channel and SW Sicily (74609)
Jakub Fedorik, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia, Giovanni Toscani, University of Pavia, Dipartimento di Scienze della Terra e dell’Ambiente, Pavia, Italy, Emanuele Lodolo, National Institute of Oceanography and Applied Geophysics OGS, Trieste, Italy, Lorenzo Bonini, University of Trieste, Trieste, Italy and Silvio Seno, University of Pavia, Department of Earth and Environmental Sciences, Pavia, Italy
How Fault Geometry Affects Dynamic Rupture Models of Earthquakes in San Gorgonio Pass, CA (81353)
Jennifer M Tarnowski, University of California Riverside, Riverside, United States, David Douglas Oglesby, University of California Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States, Michele L Cooke, University of Massachusetts Amherst, Earth, Geographic and Climate Sciences, Amherst, MA, United States and Christodoulos Kyriakopoulos, University of California, Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States
Segmentation Along the Newport-Inglewood Rose Canyon Fault Zone: Implications for Rupture Propagation (80921)
Valerie J Sahakian1, Jayne M Bormann2, Neal W Driscoll3, Alistair J Harding1, Graham M Kent4 and Steven G Wesnousky4, (1)University of California San Diego, La Jolla, CA, United States, (2)California State University Long Beach, Department of Geological Sciences, Long Beach, CA, United States, (3)Scripps Institution of Oceanog, La Jolla, CA, United States, (4)University of Nevada Reno, Nevada Seismological Laboratory, Reno, United States
Evidence of sub Kilometer-scale Variability in Stress Directions near Active Faults: An Example from the Newport-Inglewood Fault, Southern California (74268)
Patricia Persaud, University of Arizona, Department of Geosciences, Tucson, AZ, United States, Joann M Stock, California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States and Deborah Smith, US Geological Survey, Menlo Park, CA, United States
Stress-transfer efficiency in presence of sub-patch fault roughness (72131)
Olaf Zielke, King Abdullah University of Science and Technology, Earth Science and Engineering, Thuwal, Saudi Arabia and Paul Martin Mai, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
Development and evolution of folds, faults and fractures within a thrust sheet in fold-thrust belt, Guoshing, central Taiwan (72994)
Chia-Hung Yeh1, Chia-Yu Lu1 and Jian-Cheng Lee2, (1)Department of Geoscience, National Taiwan University, Taipei, Taiwan, (2)Academia Sinica, Institute of Earth Sciences, Taipei, Taiwan
Feature Detection in SAR Interferograms With Missing Data Displays Fault Slip Near El Mayor-Cucapah and South Napa Earthquakes (81069)
Jay W Parker1, Andrea Donnellan2, Margaret T Glasscoe3 and Timothy Stough1, (1)NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, (2)Jet Propulsion Laboratory, California Institute of Technology, Instrument Systems Section, Pasadena, United States, (3)University of Alabama in Huntsville, Huntsville, United States
Scaling of Maximum Observed Magnitudes with Geometrical and Stress Properties of Strike-Slip Faults (77553)
Patricia Martínez-Garzón1, Marco Bohnhoff1, Yehuda Ben-Zion2 and Georg Dresen1, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany, (2)University of Southern California, Los Angeles, CA, United States
Correlating Rayleigh-wave Breakout Phases with Source Parameters from 2-D Dip-slip Fault Geometries Under Equivalent Prestress Conditions (81962)
Kenny J Ryan, University of California Riverside, Riverside, United States, David Douglas Oglesby, University of California Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States, Eric L Geist, USGS, Menlo Park, CA, United States and Hong Kie Thio, AECOM California, Los Angeles, CA, United States
Correlation between calculated stress distribution and recorded seismicity in Northern Israel and its surrounding (65902)
Nadav Wetzler1, Ittai Kurzon2, Michal Rosenthal2, Amit Segev2, Michael Rybakov2, Zvi Ben-Avraham3 and Vladimir Lyakhovsky4, (1)University of California Santa Cruz, Santa Cruz, United States, (2)Geological Survey Isreal, Jerusalem, Israel, (3)University of Haifa, Haifa, Israel, (4)Geological Survey of Isreal, Jerusalem, Israel

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