Splay fault activity revealed by aftershocks of the 2010 Mw 8.8 Maule earthquake, central Chile

Lieser, Kathrin, Grevemeyer, Ingo, Lange, Dietrich, Flueh, Ernst, Tilmann, Frederik and Contreras-Reyes, Eduardo (2014) Splay fault activity revealed by aftershocks of the 2010 Mw 8.8 Maule earthquake, central Chile Geology, 42 (9). pp. 823-826. DOI 10.1130/G35848.1.

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Splay faults, large thrust faults emerging from the plate boundary to the seafloor in subduction zones, are considered to enhance tsunami generation by transferring slip from the very shallow dip of the megathrust onto steeper faults, thus increasing vertical displacement of the seafloor. These structures are predominantly found offshore, and are therefore difficult to detect in seismicity studies, as most seismometer stations are located onshore. The Mw (moment magnitude) 8.8 Maule earthquake on 27 February 2010 affected ∼500 km of the central Chilean margin. In response to this event, a network of 30 ocean-bottom seismometers was deployed for a 3 month period north of the main shock where the highest coseismic slip rates were detected, and combined with land station data providing onshore as well as offshore coverage of the northern part of the rupture area. The aftershock seismicity in the northern part of the survey area reveals, for the first time, a well-resolved seismically active splay fault in the submarine forearc. Application of critical taper theory analysis suggests that in the northernmost part of the rupture zone, coseismic slip likely propagated along the splay fault and not the subduction thrust fault, while in the southern part it propagated along the subduction thrust fault and not the splay fault. The possibility of splay faults being activated in some segments of the rupture zone but not others should be considered when modeling slip distributions.

Document Type: Article
Additional Information: WOS:000345362100022
Keywords: splay fault, subduction zone, seismicity, cental Chile, Maule, RV SONNE
Research affiliation: GFZ
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1130/G35848.1
ISSN: 0091-7613
Projects: MARISCOS
Date Deposited: 28 Aug 2014 12:45
Last Modified: 17 May 2017 08:39
URI: http://eprints.uni-kiel.de/id/eprint/25486

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