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:10.1080/03009480600827314

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…According to Sutinen et al (2014a), the Palojärvi, Paatsikkajoki and Kultima fault ruptures in the Palojärvi PGF complex were probably formed subglacially and soon after the deglaciation some 10 000 cal BP. In southern Finland, Hutri et al (2007) revealed disturbed sedimentary structures in a marine sequence in the Gulf of Bothnia off the (Ojala et al, 2017a). The study sites were sorted from the lowest to highest terrain roughness and from the gentlest to steepest slope, and calibrated 14C dates of landslide-buried organic matter from drilled sites are indicated with arrows ( Figure 1, Tables I and II).…”

Section: Ages Of Landslides In Relation To Fault Instability In Fennomentioning

confidence: 99%

“…According to Sutinen et al (2014a), the Palojärvi, Paatsikkajoki and Kultima fault ruptures in the Palojärvi PGF complex were probably formed subglacially and soon after the deglaciation some 10 000 cal BP. In southern Finland, Hutri et al (2007) revealed disturbed sedimentary structures in a marine sequence in the Gulf of Bothnia off the Figure 6. An array of landslide scarp roughness (A) (mean standard deviation of 5×5 m grid) and backwall slope values (B) for the debris slide type of landslides in northern Finland (Ojala et al, 2017a).…”

Section: Ages Of Landslides In Relation To Fault Instability In Fennomentioning

confidence: 99%

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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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Section: Ages Of Landslides In Relation To Fault Instability In Fennomentioning

confidence: 99%

“…According to Sutinen et al (2014a), the Palojärvi, Paatsikkajoki and Kultima fault ruptures in the Palojärvi PGF complex were probably formed subglacially and soon after the deglaciation some 10 000 cal BP. In southern Finland, Hutri et al (2007) revealed disturbed sedimentary structures in a marine sequence in the Gulf of Bothnia off the Figure 6. An array of landslide scarp roughness (A) (mean standard deviation of 5×5 m grid) and backwall slope values (B) for the debris slide type of landslides in northern Finland (Ojala et al, 2017a).…”

Section: Ages Of Landslides In Relation To Fault Instability In Fennomentioning

confidence: 99%

Dating of paleolandslides in western Finnish Lapland

Ojala

Markovaara‐Koivisto

Middleton

et al. 2018

Earth Surf Processes Landf

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

Cited by 2 publications

References 21 publications

Dating of paleolandslides in western Finnish Lapland

Dating of paleolandslides in western Finnish Lapland

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

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