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Tyrens |
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Tyréns, located in Sweden, has a rich history of innovation in the civil engineering industry. Following this inventive tradition, they have developed a 24-channel land streamer with a simple and elegant design. The main application for the streamer is to collect and interpret seismic surface waves. These data are processed and interpreted using the popular MASW technique, utilizing software written by the Kansas Geological Survey. Standard 4.5 Hz OYO/Geospace geophones are mounted on metal plates (approx 4 kg) with a spacing of 1 m, connected to a synthetic fibre band. A Geometrics Geode seismograph and a laptop are used for data collection. For the actual test a sledgehammer is used as the seismic source, with an offset of 5 m. |
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A simple metal plate provides good coupling for Tyrens surface wave surveys |
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Initial tests of the system, presented here, were performed in an urban area in Malmö, Sweden. Ground correlation is provided using soil sampling and comparison to vertical seismic profiling surveys The resulting shear wave velocity profile shown below correlates well with the general stratigraphy interpreted from other data in the area - 5 m of clay till, 5 m transition zone with highly fractured limestone and more competent limestone below. The interpreted shear wave velocities are also well in accordance with shear wave velocities determined by VSP tests in the area. For more information, contact Mats Svensson at mats.svensson@tyrens.se |
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Tyréns land streamer undergoing initial testing |
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