First direct observation of coseismic slip and seafloor rupture along a submarine normal fault and implications for fault slip history

Javier Escartín; Frédérique Leclerc; Jean-Arthur Olive; Catherine Mevel; Mathilde Cannat; Sven Petersen; Nico Augustin; Nathalie Feuillet; Christine Deplus; Antoine Bezos; Diane Bonnemains; Valérie Chavagnac; Yujin Choi; Marguerite Godard; Kristian Haaga; Cédric Hamelin; Benoit Ildefonse; John Jamieson; Barbara John; Thomas Leleu; Christopher Macleod; Miquel Campos; Paraskevi Nomikou; Marine Paquet; Céline Rommevaux-Jestin; Marcel Rothenbeck; Anja Steinführer; Masako Tominaga; Lars Triebe; Ricard Campos; Nuno Gracias; Rafael Garcia; Muriel Andreani; Géraud Vilaseca

doi:10.1016/j.epsl.2016.06.024

First direct observation of coseismic slip and seafloor rupture along a submarine normal fault and implications for fault slip history

Javier Escartín ¹ Frédérique Leclerc ² Jean-Arthur Olive ³ Catherine Mevel ¹ Mathilde Cannat ¹ Sven Petersen ⁴ Nico Augustin ⁴ Nathalie Feuillet ¹ Christine Deplus ¹ Antoine Bezos ⁵ Diane Bonnemains ¹ Valérie Chavagnac ⁶ Yujin Choi ¹ Marguerite Godard ⁷ Kristian Haaga ⁸ Cédric Hamelin ⁸ Benoit Ildefonse ⁷ John Jamieson ⁴ Barbara John ⁹ Thomas Leleu ⁶ Christopher Macleod ¹⁰ Miquel Campos ¹¹ Paraskevi Nomikou ¹² Marine Paquet ¹ Céline Rommevaux-Jestin ¹ Marcel Rothenbeck ⁴ Anja Steinführer ⁴ Masako Tominaga ¹³ Lars Triebe ² Ricard Campos ¹⁴ Nuno Gracias ¹⁴ Rafael Garcia ¹⁴ Muriel Andreani ¹⁵ Géraud Vilaseca ¹

1 IPGP - Institut de Physique du Globe de Paris

2 Earth Observatory of Singapore

3 LDEO - Lamont-Doherty Earth Observatory

4 GEOMAR - GEOMAR - Helmholtz Centre for Ocean Research [Kiel]

5 LPGN - Laboratoire de Planétologie et Géodynamique de Nantes

6 GET - Géosciences Environnement Toulouse

7 Géosciences Montpellier

8 Department of Earth Science [Bergen]

9 UW - University of Wyoming

10 Cardiff University

11 Universitat des Illes Balears

12 National and Kapodistrian University of Athens

13 Texas A&M University [College Station]

14 UdG - Universitat de Girona

15 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon]

Abstract : Properly assessing the extent and magnitude of fault ruptures associated with large earthquakes is critical for understanding fault behavior and associated hazard. Submarine faults can trigger tsunamis, whose characteristics are defined by the geometry of seafloor displacement, studied primarily through indirect observations (e.g., seismic event parameters, seismic profiles, shipboard bathymetry, coring) rather than direct ones. Using deep-sea vehicles, we identify for the first time a marker of coseismic slip on a submarine fault plane along the Roseau Fault (Lesser Antilles), and measure its vertical displacement of ∼0.9 m in situ. We also map recent fissuring and faulting of sediments on the hangingwall, along ∼3 km of rupture in close proximity to the fault's base, and document the reactivation of erosion and sedimentation within and downslope of the scarp. These deformation structures were caused by the 2004 M w 6.3 Les Saintes earthquake, which triggered a subsequent tsunami. Their characterization informs estimates of earthquake recurrence on this fault and provides new constraints on the geometry of fault rupture, which is both shorter and displays locally larger coseismic displacements than available model predictions that lack field constraints. This methodology of detailed field observations coupled with near-bottom geophysical surveying can be readily applied to numerous submarine fault systems, and should prove useful in evaluating seismic and tsunamigenic hazard in all geodynamic contexts.

Type de document :

Article dans une revue

Earth and Planetary Science Letters, Elsevier, 2016, 450, pp.96-107. 〈10.1016/j.epsl.2016.06.024〉

Domaine :

Planète et Univers [physics] / Sciences de la Terre / Tectonique

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