Did the Younger Dryas to Holocene climate transition favour high seismicity rates in the north‐western Alps?

Banjan, Mathilde; Crouzet, Christian; Sabatier, Pierre; Jomard, Hervé; Bajard, Manon; Demory, François; Develle, Anne‐Lise; Jenny, Jean‐Philippe; Fanget, Bernard; Malet, Emmanuel; Findling, Nathaniel; Alain, Philippe; Didier, Julien; Bichet, Vincent; Clapot, Sylvain; Messager, Erwan

doi:10.1111/sed.13050

Cited by 4 publications

(23 citation statements)

References 129 publications

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“…Overall, we do not obtain a significant runup distance because the steep slope confines the inundation process and the limited energy of the tsunami associated with the small volume of the slide also contributes to the rapid attenuation of the wave, further reducing the runup distance. Regarding future tsunami hazard, it is worth noting that this large subaqueous mass‐movement event was associated with higher seismic activity at the Younger Dryas‐Holocene climate transition, in relation to glacial rebound (Banjan et al., 2022). However, no other significant events have been identified over the Holocene, suggesting a low risk of tsunami hazard in Lake Aiguebelette.…”

Section: Discussionmentioning

confidence: 99%

“…The white circle on the lake's western shore shows the sliding mass position. We can observe the littoral carbonate platform on the western coast in light blue, except for the area of sliding mass in the white circle (modified from Banjan et al (2022)).…”

Section: Study Site and Lake Sedimentary Sequencesmentioning

confidence: 99%

“…The geology of the catchment area is presented in Figure 1a (further detailed in Banjan et al. (2022)), while Figure 1b shows an aerial view of the lake.…”

Section: Study Site and Lake Sedimentary Sequencesmentioning

confidence: 99%

“…115 cm thick event layer in the AIG7III sedimentary sequences can be shown in a(iv). (b) Shows the map of channelized mass transport deposits and slope angles which includes overlays of the shape and thickness of the initial sliding mass and the interpolated thickness derived from seismic profiles (modified from Banjan et al (2022)).…”

Section: Study Site and Lake Sedimentary Sequencesmentioning

confidence: 99%

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Numerical Reconstruction of Landslide Paleotsunami Using Geological Records in Alpine Lake Aiguebelette

Zafar,

Dutykh,

Sabatier

et al. 2024

JGR Solid Earth

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Mass movements and delta collapses are significant sources of tsunamis in lacustrine environments, impacting human societies enormously. Paleotsunamis studies play an essential role in understanding historical events and their consequences, along with their return periods. This study investigates a paleotsunami induced by a subaqueous mass movement during the Younger Dryas to Early Holocene transition, ca. 11,700 years ago in Lake Aiguebelette (NW Alps, France). Utilizing high‐resolution seismic and bathymetric surveys associated with sedimentological, geochemical, and magnetic analyses, we uncovered a paleotsunami triggered by a seismically induced mass transport deposit. Numerical simulations of mass movement have been conducted using a visco‐plastic Herschel‐Bulkley rheological model and corresponding tsunami wave modeled with dispersive and nondispersive models. Our findings reveal for the first time that dispersive effects may be negligible for subaqueous landslides in a relatively small lake. This research reconstructs a previously unreported paleotsunami event and enhances our understanding of tsunami dynamics in lacustrine environments.

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Section: Discussionmentioning

confidence: 99%

Section: Study Site and Lake Sedimentary Sequencesmentioning

confidence: 99%

“…The geology of the catchment area is presented in Figure 1a (further detailed in Banjan et al. (2022)), while Figure 1b shows an aerial view of the lake.…”

Section: Study Site and Lake Sedimentary Sequencesmentioning

confidence: 99%

Section: Study Site and Lake Sedimentary Sequencesmentioning

confidence: 99%

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Numerical Reconstruction of Landslide Paleotsunami Using Geological Records in Alpine Lake Aiguebelette

Zafar,

Dutykh,

Sabatier

et al. 2024

JGR Solid Earth

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“…These sediment archives can span from historical times to longer periods. In the french Alps where this study focuses, few sedimentary archives cover the entire Holocene time span are available (only Annecy - Beck et al, 1996; La Thuile and Aiguebelette (Banjan et al, 2023) lakes record the entire Holocene). At the scale of the entire alpine belt, the construction of long-term seismic chronicles is still challenging (see for example Beck et al, 1996;Wilhelm et al, 2016;Strasser et al, 2013;Rapuc et al, 2018;Bellwald et al, 2024Banjan et al, 2023.…”

Section: Introductionmentioning

confidence: 99%

A Holocene alpine seismic chronicle from Lake Aiguebelette (NW French Alps)

Banjan,

Crouzet,

Jomard

et al. 2024

Preprint

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Abstract. Lake sediments are valuable archives and can help construct a chronology of event deposits induced by seismic events. Such a chronology can be used to better understand the recurrence times between seismic events over longer periods than those covered by historical seismicity catalogs. However, only a few studies in lake palaeoseismology have focused on areas with moderate seismicity. This study aims to improve the catalog of paleoseismological archives in the front of the Western Alps. In this part, new multi-proxy data from the sedimentary archives of Lake Aiguebelette (France) allow the identification of 32 homogenites (thickness ≥ 0.5 cm) interpreted as of coseismic origin over the Holocene. An age model based on short-lived radionuclides, paleomagnetic data and radiocarbon ages constrains the chronology of sedimentary deposits in the deep basin of Lake Aiguebelette. Among these homogenites, several were deposited at time intervals compatible with historical seismic events. To correlate the historical seismic events likely to have generated the event deposits identified in the sedimentary sequences of the deep basin of Lake Aiguebelette, the Earthquake Sensitivity Threshold Index (ESTI) method is used. Historical seismicity catalogs with uncertainties about intensities and epicenter coordinates for earthquakes make correlations to event deposits difficult. To better understand which seismic events may have been archived, a relative comparison was conducted between the pseudospectral acceleration (PSA) values calculated for each event in the FCAT-17 seismic catalog and for two distinct frequencies. Based on this PSA approach, for higher frequencies (5 Hz), the contribution of nearby and moderate events is significantly stronger than that of strong and distant events in the lake sequence of Aiguebelette. Thus, the chronicle established based on the event deposits archived in Lake Aiguebelette sediment is interpreted as representative of local events (epicentral distance to the lake < 50 km). Recurrence intervals between the deposition of event layers do not follow a specific distribution (log-normal, Weibull, gamma or exponential) but might be a combination of several distributions. This suggests possible coexistence of several processes over the Holocene, impacting the evolution of the seismicity in this area.

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Evolution of the alpine Critical Zone since the Last Glacial Period using Li isotopes from lake sediments

Zhang,

Bajard,

Bouchez

et al. 2023

Earth and Planetary Science Letters

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Did the Younger Dryas to Holocene climate transition favour high seismicity rates in the north‐western Alps?

Abstract: †IRSN -Bureau d' evaluation des risques sismiques pour la sûret e des installations,

Cited by 4 publications

References 129 publications

Numerical Reconstruction of Landslide Paleotsunami Using Geological Records in Alpine Lake Aiguebelette

Numerical Reconstruction of Landslide Paleotsunami Using Geological Records in Alpine Lake Aiguebelette

A Holocene alpine seismic chronicle from Lake Aiguebelette (NW French Alps)

Evolution of the alpine Critical Zone since the Last Glacial Period using Li isotopes from lake sediments

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