Historical seismicity of the Mont Dore volcanic province (Auvergne, France) unraveled by a regional lacustrine investigation: New insights about lake sensitivity to earthquakes

“…According to former studies on lacustrine sediments sensitivities to instrumental earthquakes (Monecke et al 2004 ;Nomade et al 2005 ) both of these historical earthquakes could be recorded in nearby Lake Pavin. Another similar study combining radiocarbon dated sediment cores from nearby Lake Guéry (Chassiot et al 2016 ) also identifi ed a pluri-decimetric slump deposit along its delta that is contemporaneous with the AD 1863 Mont-Dore earthquake (Fig. 23.13 ).…”

Section: Impact Of Climate Human and Geological Hazards On Lake Pavimentioning

confidence: 86%

“…AD 1310 +/− 100 in Lake Guéry located in the Puy de Sancy area, ca. 7 km north from Pavin (Chassiot et al 2016 ). Ongoing radiocarbon dating will tell if a third regional MWD in Lake La Crégut (at ca.…”

Section: Impact Of Climate Human and Geological Hazards On Lake Pavimentioning

confidence: 98%

Lake Pavin Paleolimnology and Event Stratigraphy

et al. 2016

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International audienceIn this chapter we present an up-to-date database of sedimentary sequences retrieved from Lake Pavin during the last 50 years in both oxic and anoxic waters. The detailed history of this mid Holocene crater lake can be reconstructed from the correlation of radiocarbon dated sedimentary sequences retrieved from the deep central basin, a subaquatic plateau and littoral environments. High-resolution measurements of sediment composition (diffuse spectral refl ectance, XRF core scanning) combined with the analysis of organic matter composition and preliminary pollen and diatom assemblages investigations on selected sediment cores are used to reconstruct (i) the evolution since ca. 7000 cal BP of Lake Pavin limnology together with its radiocarbon reservoir effect and (ii) the impact of a wide range of subaquatic slope failure events. Such a multidisciplinary approach of Lake Pavin basin fi ll revealed contrasted sedimentation patterns just after the volcanic eruption and following the development of a dense vegetation cover along the slopes of the crater. Pavin sedimenta-tion is rapidly and largely dominated by organic rich and fi nely laminated diatomite formation , but several short periods of enhanced mineral inputs might refl ect the infl uence of wetter periods, such as the Little Ice Age. Over the last millennium two large subaquatic mass wasting events are also identifi ed and may have signifi cantly impacted its limnology

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“…A palaeoearthquake interpretation is especially strong when a multi‐MTD signature is correlated between lake basins, and thus represents a regionally synchronous occurrence that is difficult to explain by any aseismic mechanism (e.g. Monecke et al ., ; Maloney et al ., ; Strasser et al ., ; Chassiot et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Deglacial record of palaeoearthquakes interpreted from mass transport deposits at three lakes near Rouyn‐Noranda, north‐western Quebec, Canada

Brooks

2018

Sedimentology

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As part of an investigation of deglacial palaeoseismology within an intracratonic region of north-eastern North America, the compilation of sub-bottom acoustic profile surveys from study areas at Duparquet and Dufresnoy lakes, north-western Quebec, Canada, produced thirteen and eight event horizon maps, respectively, depicting subaqueous mass transport deposits that are interbedded within Lake Ojibway glaciolacustrine varve deposits. Analysis of rhythmic couplets recovered in cores from both locations yielded varve ages with annual resolution for the event horizons relative to the regional Timiskaming varve series. These results are integrated with the published event horizon stratigraphy and varve chronology from nearby Lac Dasserat. The combined event horizon records for the three lakes overlap between varve years 1175 to 1625 (9395 to 8945 AE 200 cal year BP) and consist of 26 event horizons. Fifteen event horizons are inferred to be evidence of 11 palaeoearthquakes at qualitative levels of interpretative confidence varying from high to low. The palaeoearthquake interpretations and assessments of interpretative confidence are made from weightings of the event horizon signatures and, where possible, evidence supporting a stratigraphic footprint extending beyond a given study area. Occurring over a 450 varve year period when rapid crustal uplift was still underway, 11 interpreted palaeoearthquakes happened at an average rate of every ca 40 years. Relative to a published minimum threshold magnitude for generating a recognizable geomorphic signature, this average rate of occurrence exceeds the modern return period by two orders of magnitude. The palaeoearthquakes probably occurred within a period of elevated seismicity associated with rapid crustal unloading during deglaciation.

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Historical seismicity of the Mont Dore volcanic province (Auvergne, France) unraveled by a regional lacustrine investigation: New insights about lake sensitivity to earthquakes

Cited by 10 publications

References 58 publications

A 7000-year environmental history and soil erosion record inferred from the deep sediments of Lake Pavin (Massif Central, France)

A 7000-year environmental history and soil erosion record inferred from the deep sediments of Lake Pavin (Massif Central, France)

Lake Pavin Paleolimnology and Event Stratigraphy

Deglacial record of palaeoearthquakes interpreted from mass transport deposits at three lakes near Rouyn‐Noranda, north‐western Quebec, Canada

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