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Sycamore Knoll: A wave-planed pop-up structure in a sinistral-oblique thrust system, Southern California Continental Borderland

Williams, Ethan F. and Castillo, Chris M. and Klemperer, Simon L. and Raineault, Nicole A. and Gee, Lindsay (2018) Sycamore Knoll: A wave-planed pop-up structure in a sinistral-oblique thrust system, Southern California Continental Borderland. Deep Sea Research Part II: Topical Studies in Oceanography, 150 . pp. 132-145. ISSN 0967-0645. https://resolver.caltech.edu/CaltechAUTHORS:20180726-112019021

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Abstract

At the boundary between the Western Transverse Ranges province and Inner Continental Borderland of Southern California, strain is partitioned across the sinistral-oblique Anacapa-Dume Fault system. Sycamore Knoll, a pop-up structure 20 km west of Point Dume in the hanging wall of the north-dipping Anacapa-Dume Fault, stands out as an anomalous bathymetric high along the Southern California coast. We synthesize new and existing geophysical datasets, including multibeam bathymetry/backscatter and single/multichannel seismic, to understand the morphology and tectonic implications of Sycamore Knoll. We identify a complete eustatic low-stand submerged marine-terrace package encircling Sycamore Knoll platform that corresponds to the Last Glacial Maximum (LGM). The marine-terrace deposits and wave-planed surface of Sycamore Knoll require a late Quaternary uplift rate of 0.55 (+0.5/−0.3) mm/yr relative to sea-level. By combining our uplift rate with previous estimates of basin subsidence and a revised structural model of the Anacapa-Dume Fault, we determine a maximum slip rate in latest Quaternary time of 1.50 (+0.5/−0.3) mm/yr and hence a post-LGM rate of convergence across the Anacapa-Dume Fault of 0.60 (+0.2/−0.1) mm/yr.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.dsr2.2018.03.002DOIArticle
Additional Information:© 2018 Elsevier Ltd. Received 9 May 2017, Revised 8 January 2018, Accepted 9 March 2018, Available online 27 March 2018.
Group:Seismological Laboratory
Subject Keywords:E/V Nautilus Cruise ID NA072; Transverse Ranges; California Continental Borderland; Anacapa-Dume Fault; Fault-propagation fold; Fault-bend fold; Quaternary sea-level; Last Glacial Maximum; Remotely operated vehicle; Telepresence
Record Number:CaltechAUTHORS:20180726-112019021
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180726-112019021
Official Citation:Ethan F. Williams, Chris M. Castillo, Simon L. Klemperer, Nicole A. Raineault, Lindsay Gee, Sycamore Knoll: A wave-planed pop-up structure in a sinistral-oblique thrust system, Southern California Continental Borderland, Deep Sea Research Part II: Topical Studies in Oceanography, Volume 150, 2018, Pages 132-145, ISSN 0967-0645, https://doi.org/10.1016/j.dsr2.2018.03.002. (http://www.sciencedirect.com/science/article/pii/S0967064517301856)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88300
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Jul 2018 18:31
Last Modified:03 Oct 2019 20:05

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