6600 years of earthquake record in the Julian Alps (Lake Bohinj, Slovenia)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A90072%2F18%3A00344180" target="_blank" >RIV/68407700:90072/18:00344180 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1111/sed.12446" target="_blank" >https://doi.org/10.1111/sed.12446</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/sed.12446" target="_blank" >10.1111/sed.12446</a>

Result language

angličtina

Original language name

6600 years of earthquake record in the Julian Alps (Lake Bohinj, Slovenia)

Original language description

Sequences of lake sediments often form long and continuous records that may be sensitive recorders of seismic shaking. A multi-proxy analysis of Lake Bohinj sediments associated with a well-constrained chronology was conducted to reconstruct Holocene seismic activity in the Julian Alps (Slovenia). A seismic reflection survey and sedimentological analyses identified 29 homogenite-type deposits related to mass-wasting deposits. The most recent homogenites can be linked to historical regional earthquakes (i.e. 1348ad, 1511ad and 1690ad) with strong epicentral intensity [greater than damaging' (VIII) on the Medvedev-Sponheuer-Karnik scale]. The correlation between the historical earthquake data set and the homogenites identified in a core isolated from local stream inputs, allows interpretation of all similar deposits as earthquake related. This work extends the earthquake chronicle of the last 6600years in this area with a total of 29 events recorded. The early Holocene sedimentary record is disturbed by a seismic event (6617 +/- 94calyrbp) that reworked previously deposited sediment and led to a thick sediment deposit identified in the seismic survey. The period between 3500calyrbp and 2000calyrbp is characterized by a major destabilization in the watershed by human activities that led to increases in erosion and sedimentation rates. This change increased the lake's sensitivity to recording an earthquake (earthquake-sensitivity threshold index) with the occurrence of 72 turbidite-type deposits over this period. The high turbidite frequency identified could be the consequence of this change in lake earthquake sensitivity and thus these turbidites could be triggered by earthquake shaking, as other origins are discarded. This study illustrates why it is not acceptable to propose a return period for seismic activity recorded in lake sediment if the sedimentation rate varies significantly.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10700 - Other natural sciences

Project

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Continuities

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Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

SEDIMENTOLOGY

ISSN

0037-0746

e-ISSN

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Volume of the periodical

65

Issue of the periodical within the volume

5

Country of publishing house

DE - GERMANY

Number of pages

23

Pages from-to

1777-1799

UT code for WoS article

000438732400014

EID of the result in the Scopus database

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