Show simple item record

dc.contributor.authorAvsar, Ulas
dc.contributor.authorJonsson, Sigurjon
dc.contributor.authorAvşar, Özgür
dc.contributor.authorSchmidt, Sabine
dc.date.accessioned2016-06-16T09:32:32Z
dc.date.available2016-06-16T09:32:32Z
dc.date.issued2016-06-28
dc.identifier.citationEarthquake-induced soft-sediment deformations and seismically amplified erosion rates recorded in varved sediments of Köyceğiz Lake (SW Turkey) 2016 Journal of Geophysical Research: Solid Earth
dc.identifier.issn21699313
dc.identifier.doi10.1002/2016JB012820
dc.identifier.urihttp://hdl.handle.net/10754/613301
dc.description.abstractEarthquake-triggered landslides amplify erosion rates in catchments, i.e. catchment response to seismic shocks (CR). In addition to historical eyewitness accounts of muddy rivers implying CRs after large earthquakes, several studies have quantitatively reported increased sediment concentrations in rivers after earthquakes. However, only a few paleolimnological studies could detect CRs within lacustrine sedimentary sequences as siliciclastic-enriched intercalations within background sedimentation. Since siliciclastic-enriched intercalations can easily be of non-seismic origin, their temporal correlation with nearby earthquakes is crucial to assign a seismic triggering mechanism. In most cases, either uncertainties in dating methods or the lack of recent seismic activity has prevented reliable temporal correlations, making the seismic origin of observed sedimentary events questionable. Here, we attempt to remove this question mark by presenting sedimentary traces of CRs in the 370-year-long varved sequence of Köyceğiz Lake (SW Turkey) that we compare with estimated peak ground acceleration (PGA) values of several nearby earthquakes. We find that earthquakes exceeding estimated PGA values of ca. 20 cm/s2 can induce soft-sediment deformations (SSD), while CRs seem only to be triggered by PGA levels higher than 70 cm/s2. In Köyceğiz Lake, CRs produce Cr- and Ni-enriched sedimentation due to the seismically mobilized soils derived from ultramafic rocks in the catchment. Given the varve chronology, the residence time of the seismically mobilized material in the catchment is determined to be 5 to 10 years.
dc.description.sponsorshipThis research was funded by King Abdullah University of Science and Technology (KAUST). We are grateful to J. Harrington (KAUST) for his constructive comments, which helped us to improve the manuscript. For the varve counting, we acknowledge Ezgi Ünal İmer (Uni. of Queensland); Tolga Necati Yaylım and Çağdaş Sağır (Muğla Sıtkı Koçman University); Rishabh Dutta, Ayrat Abdullin, Renier Ladron De Guevara, Wenbin Xu, Hannes Vasyura-Bathke, and Joël Ruch (KAUST). We also would like to thank to Jasper Moernaut and an anonymous reviewer for their constructive comments. The data for this paper are available by contacting the corresponding author.
dc.language.isoen
dc.publisherAmerican Geophysical Union (AGU)
dc.relation.urlhttp://doi.wiley.com/10.1002/2016JB012820
dc.rightsThis is the peer reviewed version of the following article: Avşar, U., S. Jónsson, Ö. Avşar, and S. Schmidt (2016), Earthquake-induced soft-sediment deformations and seismically amplified erosion rates recorded in varved sediments of Köyceğiz Lake (SW Turkey), J. Geophys. Res. Solid Earth, 121, which has been published in final form at http://doi.wiley.com/10.1002/2016JB012820. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
dc.titleEarthquake-induced soft-sediment deformations and seismically amplified erosion rates recorded in varved sediments of Köyceğiz Lake (SW Turkey)
dc.typeArticle
dc.contributor.departmentCrustal Deformation and InSAR Group
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Geophysical Research: Solid Earth
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Geological Engineering; Muğla Sıtkı Koçman University; TR Muğla Turkey
dc.contributor.institutionUMR 5805 EPOC OASU; University of Bordeaux; Pessac France
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personAvsar, Ulas
kaust.personJonsson, Sigurjon
refterms.dateFOA2016-12-06T00:00:00Z
dc.date.published-online2016-06-28
dc.date.published-print2016-06


Files in this item

Thumbnail
Name:
Av-ar_et_al-2016-Journal_of_Geophysical_Research__Solid_Earth.pdf
Size:
1.498Mb
Format:
PDF
Description:
Accepted Manuscript
Thumbnail
Name:
0e346768cfff85748f40a3520f12cf9d3b74508d9884fce750a337cbb20c2c0a.sup-1.pdf
Size:
14.33Mb
Format:
PDF
Description:
Supplemental files

This item appears in the following Collection(s)

Show simple item record