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Size-Frequency Relationship of Submarine Landslides at Convergent Plate Margins: Implications for Hazard and Risk Assessment

Size-Frequency Relationship of Submarine Landslides at Convergent Plate Margins: Implications for Hazard and Risk Assessment
Size-Frequency Relationship of Submarine Landslides at Convergent Plate Margins: Implications for Hazard and Risk Assessment
We use complete inventories of submarine landslides from the Middle America (MA) and the Central Chile (CC) trench and forearc systems to analyze the size-frequency relationship of such structures on active continental slopes. The MA forearc is characterized by subduction erosion, and the CC forearc has had an accretionary tectonic history since the Late Neogene. Both are end-member types of convergent margins around the world. Both margin segments have been mapped by high-resolution swath bathymetry at strike lengths of about 1,300 km (MA) and 1,000 km (CC). The Middle America forearc has 143 discernible slides with sizes ranging from 0.38 to 1,426 km2. Offshore Central Chile, the 62 mapped slides are 0.9–1,285 km2 in size. Slide localization is markedly different at both margin types. While they also vary strongly along strike of the individual margin, depending on forearc slope gradient, kinematic coupling between plates, or topographic structure of the downgoing plate, the size-frequency relationships are remarkably similar. This allows quantification of the incidence of a submarine slide of given size per margin segment. The relationships hold for slide sizes from 10 to 1,000 km2, with the cut-off defined by slide size (smaller slides) and sample size (larger slides). As slide traces of 100–300 km2 size are obliterated by tectonic deformation after about 200,000 years, recurrence rates for slides of a given size can be estimated. This offers a chance to assess hazard and risk resulting from such events. It is suggested that it takes 20 to 200 plate boundary earthquakes to set off a medium-sized (>10 km2) or larger slump or slide.
978-3-319-00971-1
1878-9897
165-175
Springer International Publishing
Behrmann, Jan H.
7061b9f7-3ff3-438d-9fa8-19fa5163ec0d
Völker, David
f2b8a74f-9346-407a-8129-a90140ee5d3a
Geersen, Jacob
abcf5f76-3608-4322-ab54-7bfb8dfcaf2d
Harders, Rieka
e9b2e9a3-c3d9-4c95-bd59-5624fc124705
Weinrebe, Wilhelm
a3e00ec0-efa5-41c7-b3e8-ed22c627bac8
Krastel, Sebastian
Behrmann, Jan-Hinrich
Volker, David
Stipp, Michael
Berndt, Christian
Urgeles, Roger
Chaytor, Jason
Huhn, Katrin
Strasser, Michael
Harbitz, Carl Bonnevie
Behrmann, Jan H.
7061b9f7-3ff3-438d-9fa8-19fa5163ec0d
Völker, David
f2b8a74f-9346-407a-8129-a90140ee5d3a
Geersen, Jacob
abcf5f76-3608-4322-ab54-7bfb8dfcaf2d
Harders, Rieka
e9b2e9a3-c3d9-4c95-bd59-5624fc124705
Weinrebe, Wilhelm
a3e00ec0-efa5-41c7-b3e8-ed22c627bac8
Krastel, Sebastian
Behrmann, Jan-Hinrich
Volker, David
Stipp, Michael
Berndt, Christian
Urgeles, Roger
Chaytor, Jason
Huhn, Katrin
Strasser, Michael
Harbitz, Carl Bonnevie

Behrmann, Jan H., Völker, David, Geersen, Jacob, Harders, Rieka and Weinrebe, Wilhelm (2014) Size-Frequency Relationship of Submarine Landslides at Convergent Plate Margins: Implications for Hazard and Risk Assessment. Krastel, Sebastian, Behrmann, Jan-Hinrich, Volker, David, Stipp, Michael, Berndt, Christian, Urgeles, Roger, Chaytor, Jason, Huhn, Katrin, Strasser, Michael and Harbitz, Carl Bonnevie (eds.) In Submarine Mass Movements and Their Consequences: 6th International Symposium. vol. 37, Springer International Publishing. pp. 165-175 . (doi:10.1007/978-3-319-00972-8_15).

Record type: Conference or Workshop Item (Paper)

Abstract

We use complete inventories of submarine landslides from the Middle America (MA) and the Central Chile (CC) trench and forearc systems to analyze the size-frequency relationship of such structures on active continental slopes. The MA forearc is characterized by subduction erosion, and the CC forearc has had an accretionary tectonic history since the Late Neogene. Both are end-member types of convergent margins around the world. Both margin segments have been mapped by high-resolution swath bathymetry at strike lengths of about 1,300 km (MA) and 1,000 km (CC). The Middle America forearc has 143 discernible slides with sizes ranging from 0.38 to 1,426 km2. Offshore Central Chile, the 62 mapped slides are 0.9–1,285 km2 in size. Slide localization is markedly different at both margin types. While they also vary strongly along strike of the individual margin, depending on forearc slope gradient, kinematic coupling between plates, or topographic structure of the downgoing plate, the size-frequency relationships are remarkably similar. This allows quantification of the incidence of a submarine slide of given size per margin segment. The relationships hold for slide sizes from 10 to 1,000 km2, with the cut-off defined by slide size (smaller slides) and sample size (larger slides). As slide traces of 100–300 km2 size are obliterated by tectonic deformation after about 200,000 years, recurrence rates for slides of a given size can be estimated. This offers a chance to assess hazard and risk resulting from such events. It is suggested that it takes 20 to 200 plate boundary earthquakes to set off a medium-sized (>10 km2) or larger slump or slide.

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More information

Published date: 2014
Venue - Dates: 6th International Symposium on Submarine Mass Movements and Their Consequences, Kiel, Germany, 2013-09-22 - 2013-09-24
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 358072
URI: http://eprints.soton.ac.uk/id/eprint/358072
ISBN: 978-3-319-00971-1
ISSN: 1878-9897
PURE UUID: 9da36e82-d7f2-4ca7-924b-73defaf6f659

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Date deposited: 30 Sep 2013 16:46
Last modified: 08 Jan 2022 15:07

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Contributors

Author: Jan H. Behrmann
Author: David Völker
Author: Jacob Geersen
Author: Rieka Harders
Author: Wilhelm Weinrebe
Editor: Sebastian Krastel
Editor: Jan-Hinrich Behrmann
Editor: David Volker
Editor: Michael Stipp
Editor: Christian Berndt
Editor: Roger Urgeles
Editor: Jason Chaytor
Editor: Katrin Huhn
Editor: Michael Strasser
Editor: Carl Bonnevie Harbitz

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