6600 years of earthquake record in the Julian Alps (Lake Bohinj, Slovenia). Issue 5 (25th March 2018)
- Record Type:
- Journal Article
- Title:
- 6600 years of earthquake record in the Julian Alps (Lake Bohinj, Slovenia). Issue 5 (25th March 2018)
- Main Title:
- 6600 years of earthquake record in the Julian Alps (Lake Bohinj, Slovenia)
- Authors:
- Rapuc, William
Sabatier, Pierre
Andrič, Maja
Crouzet, Christian
Arnaud, Fabien
Chapron, Emmanuel
Šmuc, Andrej
Develle, Anne‐Lise
Wilhelm, Bruno
Demory, François
Reyss, Jean‐Louis
Régnier, Edouard
Daut, Gerhard
Von Grafenstein, Ulrich - Editors:
- Manville, Vern
- Abstract:
- Abstract: 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. 1348 ad, 1511 ad and 1690 ad ) 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 6600 years in this area with a total of 29 events recorded. The early Holocene sedimentary record is disturbed by a seismic event (6617 ± 94 cal yr bp ) that reworked previously deposited sediment and led to a thick sediment deposit identified in the seismic survey. The period between 3500 cal yr bp and 2000 cal yr bp 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 theAbstract: 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. 1348 ad, 1511 ad and 1690 ad ) 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 6600 years in this area with a total of 29 events recorded. The early Holocene sedimentary record is disturbed by a seismic event (6617 ± 94 cal yr bp ) that reworked previously deposited sediment and led to a thick sediment deposit identified in the seismic survey. The period between 3500 cal yr bp and 2000 cal yr bp 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. … (more)
- Is Part Of:
- Sedimentology. Volume 65:Issue 5(2018)
- Journal:
- Sedimentology
- Issue:
- Volume 65:Issue 5(2018)
- Issue Display:
- Volume 65, Issue 5 (2018)
- Year:
- 2018
- Volume:
- 65
- Issue:
- 5
- Issue Sort Value:
- 2018-0065-0005-0000
- Page Start:
- 1777
- Page End:
- 1799
- Publication Date:
- 2018-03-25
- Subjects:
- Earthquake chronicle -- Holocene -- Julian Alps -- lake sediment -- lake sensitivity
Sedimentology -- Periodicals
552.5 - Journal URLs:
- http://www.blackwell-synergy.com ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-3091 ↗
http://onlinelibrary.wiley.com/ ↗ - DOI:
- 10.1111/sed.12446 ↗
- Languages:
- English
- ISSNs:
- 0037-0746
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 8217.400000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 14159.xml