Dating early Holocene palaeoseismic event(s) in the Gulf of Bothnia, Baltic Sea

Hutri, Kaisa-Leena; Heinsalu, Atko; Kotilainen, Aarno; Ojala, Antti E. K.

doi:10.1111/j.1502-3885.2007.tb01180.x

Cited by 10 publications

(3 citation statements)

References 25 publications

(29 reference statements)

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“…Gravity‐flow deposits are found at the same stratigraphic level, but they were formed during a time interval at some point between 10 650 and 10 200 cal. bp (Hutri et al. , 2007), which is probably 100 to 450 years later than in the study area (11 100 to 10 300 cal.…”

Section: Discussionmentioning

confidence: 74%

“…1), where Kotilainen & Hutri (2004) have described similar disturbance structures, was deglaciated 500 clay‐varve years later than the study area (Sauramo, 1923; Strömberg, 2005). In Olkiluoto, the disturbance structures are probably 100 to 450 years younger (Hutri et al. , 2007), which corresponds to the delay in deglaciation; this suggests that the normal faulting, slumping and debris‐flow deposition are time‐transgressive in the direction of the ice‐margin retreat (Fig.…”

Section: Discussionmentioning

confidence: 99%

“… A comparison of stratigraphic successions and depositional conditions in the AS2‐PC4 and Olkiluoto sites at 10 650 cal. bp , when the sediment disturbance began in Olkiluoto according to Hutri et al. (2007).…”

Section: Discussionmentioning

confidence: 99%

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Late‐glacial and post‐glacial deposition in a large, low relief, epicontinental basin: the northern Baltic Sea

Virtasalo¹,

Kotilainen

Räsänen³

et al. 2007

Sedimentology

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This paper presents a model of late‐glacial and post‐glacial deposition for the late‐Neogene sedimentary succession of the Archipelago Sea in the northern Baltic Sea. Four genetically related facies associations are described: (i) an ice‐proximal, acoustically stratified draped unit of glaciolacustrine rhythmites; (ii) an onlapping basin‐fill unit of rotated rhythmite clasts in an acoustically transparent to chaotic matrix interpreted as debris‐flow deposits; (iii) an ice‐distal, acoustically stratified to transparent, draped unit of post‐glacial lacustrine, weakly laminated to homogeneous deposits; and (iv) an acoustically stratified to transparent unit of brackish‐water, organic‐rich sediment drifts. The debris‐flow deposits of the unit 2 pass laterally into slide scars that truncate the unit 1; they are interpreted to result from a time interval of intense seismic activity due to bedrock stress release shortly after deglaciation of the area. Ice‐berg scouring and gravitational failure of oversteepened depositional slopes may also have contributed to the debris‐flow deposition. Comparisons to other late‐Neogene glaciated basins, such as the Hudson Bay or glacial lakes formed along the Laurentide ice sheet, suggest that the Archipelago Sea succession may record development typical for the deglaciation phase of large, low relief, epicontinental basins. The Carboniferous–Permian glacigenic Dwyka Formation in South Africa may provide an ancient analogue for the studied succession. Chronological control for the studied sediments is provided by the independent palaeomagnetic and AMS‐14C dating methods. In order to facilitate dating of the organic‐poor early post‐glacial deposits of the northern Baltic Sea, the 10 000 year long Lake Nautajärvi palaeomagnetic reference chronology (Ojala & Saarinen, 2002) is extended by 1200 years.

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Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

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Late‐glacial and post‐glacial deposition in a large, low relief, epicontinental basin: the northern Baltic Sea

Virtasalo¹,

Kotilainen

Räsänen³

et al. 2007

Sedimentology

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Dating of paleolandslides in western Finnish Lapland

Ojala

Markovaara‐Koivisto

Middleton

et al. 2018

Earth Surf Processes Landf

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The dating of landslide‐buried organic materials potentially indicates non‐stationary seismicity in northern Finland attributable to the release of lithospheric stresses during and after retreat of the Scandinavian Ice Sheet. The landslide age data reveals three episodes of increased slope instability and formation of landslides, from 9000 to 11 000 cal BP, from 5000 to 6000 cal BP, and from 1000 to 3000 cal BP. While a seismogenic origin cannot be unequivocally established, we interpret that at least the early Holocene episode reflects increased seismic activity in northern Finland in association with late‐glacial and postglacial faulting. The foci of slope instabilities changes through time, implying that different segments of the postglacial fault systems were active at different times during the Holocene. We also show that the correlation of landslide ages with the surface roughness and backwall slope is complicated. The morphology of landslide scarps is significantly affected by thickness of glacial sediments, liquefaction during landslide formation, and accumulation of peat upon landslide scars and deposits, and thus, the time‐dependent erosional smoothing of the surfaces should be considered as descriptive and non‐qualitative. Copyright © 2018 John Wiley & Sons, Ltd.

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The conundrums of the postglacial tectonic response of the Fennoscandian and Canadian Shields

Bungum¹,

Eldholm²

2022

Earth-Science Reviews

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Dating early Holocene palaeoseismic event(s) in the Gulf of Bothnia, Baltic Sea

Cited by 10 publications

References 25 publications

Late‐glacial and post‐glacial deposition in a large, low relief, epicontinental basin: the northern Baltic Sea

Late‐glacial and post‐glacial deposition in a large, low relief, epicontinental basin: the northern Baltic Sea

Dating of paleolandslides in western Finnish Lapland

The conundrums of the postglacial tectonic response of the Fennoscandian and Canadian Shields

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