An acoustic view into Holocene palaeoseismicity offshore southwestern Finland, Baltic Sea

Hutri, Kaisa-Leena; Kotilainen, Aarno

doi:10.1016/j.margeo.2006.12.006

Cited by 13 publications

(10 citation statements)

References 18 publications

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“…Similar debrites at the same stratigraphical level are documented in the nearby Archipelago Sea (Virtasalo et al . ), the southwestern Archipelago Sea and the northernmost Baltic Sea proper (Hutri & Kotilainen ) and the Gulf of Finland (Hyttinen et al . ).…”

Section: Results and Interpretationmentioning

confidence: 99%

Toward a standard stratigraphical classification practice for the Baltic Sea sediments: the CUAL approach

Virtasalo

Hämäläinen

Kotilainen

2014

Boreas

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The Late Pleistocene and Holocene glacial and postglacial sediments of the Baltic Sea basin are conventionally classified into units according to the so‐called Baltic Sea stages: Baltic Ice Lake, Yoldia Sea, Ancylus Lake and Litorina Sea. The Baltic Sea stages have been identified in offshore sediment cores by fundamentally different criteria, precluding detailed comparisons of the sediment units amongst different sea areas and studies. Here, long sediment cores and reflection seismic and pinger sub‐bottom profiles were studied from an offshore area in the Gulf of Finland, northern Baltic Sea. The strata are divided on the basis of sedimentological criteria into three allostratigraphical formations with subordinate allostratigraphical members and lithostratigraphical formations, following the combined allostratigraphical and lithostratigraphical (CUAL) approach. Sedimentological features are recommended as the primary stratigraphical classification criteria because they do not require the palaeoenvironmental inferences of salinity and water level that are inherent in the conventional classification practice. The presented stratigraphical division is proposed as a flexible template for future stratigraphical work on the Baltic Sea basin, whereby lower‐rank allounits and lithounits can be included and removed locally, while the alloformations will remain at the highest hierarchical level and guarantee regional correlatability. The stratigraphical division is compatible with international guidelines, facilitating communication to the wider scientific community and comparison with other similar basins.

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Section: Results and Interpretationmentioning

confidence: 99%

Toward a standard stratigraphical classification practice for the Baltic Sea sediments: the CUAL approach

Virtasalo

Hämäläinen

Kotilainen

2014

Boreas

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“…bp , Table 2). Hutri & Kotilainen (2007) report that the gravity‐flow deposits are restricted to areas where modern water depths exceed 30 m.…”

Section: Discussionmentioning

confidence: 99%

“…(2003) associate the disturbance structures with gravitational collapse due to the melt of buried ice, but they also recommend investigating the possibility of earthquakes. In addition to palaeoseismicity, a massive meltwater surge from the ice sheet, as well as an extremely rapid water‐level fall, have recently been discussed as potential triggers for the post‐glacial, debris‐flow dominated deposition in the northern BSB (Hutri & Kotilainen, 2007). However, a massive meltwater surge is an unlikely cause for the debris flows because a high‐energy discharge would incorporate coarse glaciclastic material into the debris flow, but the grain sizes in FA2 are not markedly increased compared to FA1.…”

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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“…In surveys of marine soil stratigraphy, some useful techniques such as core sampling (e.g., Hori et al, 2001;Hasiotis et al, 2005;Heivaert and Baeteman, 2007), seismic reflection (e.g., Terrinha et al, 2003;Hasiotis et al, 2005;Mienis et al, 2006;Schlüter and UenzelmannNeben, 2007), acoustic reflection (e.g., Mienis et al, 2006;Hutri and Kotilainen, 2007), and ground-penetrating radar (e.g., Neal et al, 2002) have been applied. Some of these techniques require a sea vehicle (e.g., survey ship, sidescan sonar) and are applicable to the investigation of the submerged sediment stratigraphy with a sufficient water depth.…”

Section: Introductionmentioning

confidence: 99%

Application of MASW technology to identification of tidal flat stratigraphy and its geoenvironmental interpretation

Watabe

Sassa

2008

Marine Geology

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An acoustic view into Holocene palaeoseismicity offshore southwestern Finland, Baltic Sea

Cited by 13 publications

References 18 publications

Toward a standard stratigraphical classification practice for the Baltic Sea sediments: the CUAL approach

Toward a standard stratigraphical classification practice for the Baltic Sea sediments: the CUAL approach

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

Application of MASW technology to identification of tidal flat stratigraphy and its geoenvironmental interpretation

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