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Analysis of submarine landsliding in the rupture area of the 27 February 2010 Maule earthquake, Central Chile

Analysis of submarine landsliding in the rupture area of the 27 February 2010 Maule earthquake, Central Chile
Analysis of submarine landsliding in the rupture area of the 27 February 2010 Maule earthquake, Central Chile
The comparison of bathymetric datasets compiled before and after the Mw = 8.8 Maule Earthquake of the 27 February 2010 offshore Central Chile proves that no new submarine landslides on a size scale detectable with hull-mounted bathymetric echosounders (features of a horizontal size of > 1 km) formed as a direct consequence of the ground shaking. Gravity coring around a pre-existing slide feature offshore Concepción (BioBio Slide), however, documents that (1) a number of events occurred as retrogressive failures of the BioBio Slide wall, the youngest of which is 700–1000 years old, and that (2) a very recent small scale slide structure resulted from non-destructive imbricate stacking of a thin sediment layer. Pore water geochemical data show that this event post-dates the Maule Earthquake, suggesting that it was triggered by one of the numerous aftershocks. The absence of larger failures and the presence of a small slide let us propose that in contrast to apparent logic, frequent violent earthquakes at convergent margins do not necessarily pose a particular tsunami risk by landslides. The frequent shaking might even limit the slide volume and therefore their tsunami hazard, as instead of rare and large slides, frequent smaller slides are induced.
submarine landslide, seismically triggered mass wasting, Maule Earthquake, slope stability, swath bathymetry, pore water, geochemistry, transport modelling
0025-3227
79-89
Völker, David
f2b8a74f-9346-407a-8129-a90140ee5d3a
Scholz, Florian
c5ace09b-e7fd-409c-a1a1-80f0dc4ac449
Geersen, Jacob
abcf5f76-3608-4322-ab54-7bfb8dfcaf2d
Völker, David
f2b8a74f-9346-407a-8129-a90140ee5d3a
Scholz, Florian
c5ace09b-e7fd-409c-a1a1-80f0dc4ac449
Geersen, Jacob
abcf5f76-3608-4322-ab54-7bfb8dfcaf2d

Völker, David, Scholz, Florian and Geersen, Jacob (2011) Analysis of submarine landsliding in the rupture area of the 27 February 2010 Maule earthquake, Central Chile. Marine Geology, 288 (1-4), 79-89. (doi:10.1016/j.margeo.2011.08.003).

Record type: Article

Abstract

The comparison of bathymetric datasets compiled before and after the Mw = 8.8 Maule Earthquake of the 27 February 2010 offshore Central Chile proves that no new submarine landslides on a size scale detectable with hull-mounted bathymetric echosounders (features of a horizontal size of > 1 km) formed as a direct consequence of the ground shaking. Gravity coring around a pre-existing slide feature offshore Concepción (BioBio Slide), however, documents that (1) a number of events occurred as retrogressive failures of the BioBio Slide wall, the youngest of which is 700–1000 years old, and that (2) a very recent small scale slide structure resulted from non-destructive imbricate stacking of a thin sediment layer. Pore water geochemical data show that this event post-dates the Maule Earthquake, suggesting that it was triggered by one of the numerous aftershocks. The absence of larger failures and the presence of a small slide let us propose that in contrast to apparent logic, frequent violent earthquakes at convergent margins do not necessarily pose a particular tsunami risk by landslides. The frequent shaking might even limit the slide volume and therefore their tsunami hazard, as instead of rare and large slides, frequent smaller slides are induced.

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More information

Published date: October 2011
Keywords: submarine landslide, seismically triggered mass wasting, Maule Earthquake, slope stability, swath bathymetry, pore water, geochemistry, transport modelling
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 338898
URI: http://eprints.soton.ac.uk/id/eprint/338898
ISSN: 0025-3227
PURE UUID: abc08342-0ac3-48ed-8032-60c1c658fd57

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Date deposited: 17 May 2012 13:27
Last modified: 14 Mar 2024 11:06

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Contributors

Author: David Völker
Author: Florian Scholz
Author: Jacob Geersen

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