Mapping of large-scale diapir structures at the paleo-ice tongue bed in western Latvia from geophysical investigations and borehole data

Lamsters, Kristaps; Karušs, Jānis; Stūrmane, A.; Ješkins, Jurijs; Džeriņš, Pēteris

doi:10.1016/j.quaint.2020.12.003

Cited by 8 publications

(2 citation statements)

References 30 publications

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“…Moreover, the resistivity of 34–218 Ω·m, similar to the second resistivity class, was measured below 125 m a.s.l. (Lamsters et al, 2022; Reynolds, 1997). The third type of resistivity class between 100 and 400 Ω·m (3 in Figure 5a) was recorded at 118–130 m a.s.l.…”

Section: Resultsmentioning

confidence: 99%

Origin and post‐glacial evolution of surface cracks: A case study from the area of the Last Glaciation, north‐eastern Poland

Karasiewicz,

Hrynowiecka,

Weckwerth

et al. 2023

Earth Surf Processes Landf

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The analysis of LiDAR‐based digital elevation models revealed the existence of groups of longitudinal fractures in the ground in northern Poland at the limit of the ice sheet's extent during its last maximum. Our research on the closed elongated depressions (CEDs) of the Jedwabno test field (Szuć site, north‐east Poland) focuses on explaining their origins and their post‐glacial history. This region was covered by an ice sheet and glacitectonically active during the Vistulian, and at least some surface fractures are possible witnesses to this activity. Using geomorphological mapping, sedimentological and geophysical research, we assumed it was related that the origin of these features here is associated with groundwater migration at the end of the Vistulian glaciation or later when groundwater flow intensified due to a rapid climate warming that caused permafrost to melt. The thawing of permafrost caused to transition from continuous permafrost to discontinuous, which in turn created groundwater flow that was probably responsible for the development of the surface cracks (fractures). Radiocarbon, palaeobiological (pollen, Cladocera) and geochemical studies allowed for an estimation of the formation time of these unique surface cracks in the Older Dryas. Prevailing conditions were also reconstructed for the later dynamic changes of the end of the Late Vistulian glaciation and in the Late Holocene until the Subatlantic Period (Megalayan stage). The surface cracks with steep slopes, despite their small area, are extraordinary sedimentation traps that have, in a special way, retained an almost complete record of the environmental and climate changes of the Late Glacial. There are sedimentological gaps in the Holocene, especially after the Preboreal (old part of the Greenlandian Stage), caused by changes in water levels, aeolian processes and human activity.

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Section: Resultsmentioning

confidence: 99%

Origin and post‐glacial evolution of surface cracks: A case study from the area of the Last Glaciation, north‐eastern Poland

Karasiewicz,

Hrynowiecka,

Weckwerth

et al. 2023

Earth Surf Processes Landf

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“…Altogether, an over 880mlong profile with 5 m spacing and a 176mlong profile with 2 m spacing (Fig. 1) were recorded using a rollalong technique (Geotomo Software 2017; Lamsters et al 2022). The overlap of the individual profiles was chosen to obtain continuous data coverage down to the depths of approximately 25 m for 2 m electrode spacing (36 electrodes -72 m overlap) and 50 m for 5 m electrode spacing (36 electrodes -180 m overlap).…”

Section: Electrical Resistivity Tomography Surveymentioning

confidence: 99%

Limitations in detectability of air-filled gypsum karst cavity by electrical resistivity tomography: a case study from the Baltic Devonian sedimentary basin

Karušs,

Džeriņš,

Lamsters

et al. 2023

EJES

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Karst terrain is widely distributed globally, posing one of the most significant issues for civil engineering and public safety. Electrical resistivity tomography (ERT) is regarded as the most suitable method for exploring subsurface karst features. Nevertheless, ambiguities in the ERT inversion process can arise due to specific geological conditions. In this study, we used measurements obtained in the area next to a recently developed gypsum karst sinkhole in Latvia and 3D geophysical modelling to specifically analyse the limitations in identifying near-surface air-filled karst voids by ERT. Our results emphasise that due to the 3D effect, even the recent sinkhole may be undetectable in ERT data, despite the placement of ERT profiles directly above the overhanging part of the 7-m-deep sinkhole. The 2D synthetic modelling results suggest that a karst sinkhole of similar size to the one surveyed in the field should be easily recognised. In contrast, the results obtained with 3D synthetic modelling reveal almost no indication of a sinkhole in the modelled profiles. We conclude that 2D synthetic modelling cannot always be used to assess the possibilities of identifying subsurface cavities with the ERT method. Reliable assessment can only be achieved using 3D synthetic modelling techniques. Our results demonstrate that problems with detecting air-filled karst sinkholes can arise not only in areas where surrounding rocks have a high electrical resistivity but also where surrounding rocks have a low resistivity.

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Geophysical Investigation of Recently Formed Collapse in Latvia

Džeriņš,

Karušs,

Ješkins

2023

Advances in Science, Technology &Amp; Innovation

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Mapping of large-scale diapir structures at the paleo-ice tongue bed in western Latvia from geophysical investigations and borehole data

Cited by 8 publications

References 30 publications

Origin and post‐glacial evolution of surface cracks: A case study from the area of the Last Glaciation, north‐eastern Poland

Origin and post‐glacial evolution of surface cracks: A case study from the area of the Last Glaciation, north‐eastern Poland

Limitations in detectability of air-filled gypsum karst cavity by electrical resistivity tomography: a case study from the Baltic Devonian sedimentary basin

Geophysical Investigation of Recently Formed Collapse in Latvia

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