Refraction seismic soundings on three crag and tail ridges in Central Finland
In this study we describe the materials and thicknesses of tills in three crag and tail ridges located in Central Finland. According to the refraction seismic soundings the tills above the groundwater table are loose and sandy and their average seismic velocities are from 900 to 1200 m/s. The tills...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Geological Society of Finland
1992-06-01
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| Series: | Bulletin of the Geological Society of Finland |
| Subjects: | |
| Online Access: | http://www.geologinenseura.fi/bulletin/Volume64/sgs_bt_064_1_pages_023_033.pdf |
| Summary: | In this study we describe the materials and thicknesses of tills in three crag and tail ridges located in Central Finland. According to the refraction seismic soundings the tills above the groundwater table are loose and sandy and their average seismic velocities are from 900 to 1200 m/s. The tills below the groundwater table are compact and sandy and their average seismic velocities are from 2000 to 2200 m/s. Below the highest shoreline of the Baltic Sea the tills are overlain by from 1 to 3 m thick shore deposits (washed tills). Their seismic velocities are from 330 to 870 m/s. The depth of the groundwater table in the ridge tails varies from 1 to 24 m. The tills are 55 m at their thickest. They may be even thicker than that, perhaps 85 m. |
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| ISSN: | 0367-5211 1799-4632 |