3D seismic investigations in Nördlich Lägern – Informing the affected landowners beginsAfter the measurement campaigns last winter in the regions Zürich Nordost and Jura Ost, Nagra will carry out 3D seismic investigations in the Nördlich Lägern region from autumn of this year.
The measurements will characterise the underground environment in more detail as part of the ongoing investigations in the context of the Sectoral Plan for Deep Geological Repositories. The affected landowners and tenants will provided with information about the planned work from next Monday. The Cantons, local communities, the regional conference and the responsible authorities have already been informed.
The 3D seismic investigations in the Nördlich Lägern region are being carried out on behalf of Nagra (National Cooperative for the Disposal of Radioactive Waste) and will cover an area of around 91 square kilometres. The area to be measured lies between Bülach and Neerach in the south and extends to Hüntwangen and Kaiserstuhl in the north. Measurements will also be performed in the neighbouring German area of Hohentengen. In the coming months, information about the campaign will be provided to landowners on whose land measurement lines or cables will be laid. An experienced team led by geologist Hanspeter Weber will be responsible for visiting the affected landowners in person. The team members are mostly active or retired Nagra employees supported by several long-standing Nagra contractors. Hansruedi Fisch, also a Nagra employee, is responsible for the overall coordination of the campaign. He can be contacted via the free hotline 0800 437 333 or by mail via firstname.lastname@example.org.
The seismic measuring principle is similar to echo sounding on ships: vibrator vehicles generate weak seismic waves at the surface. These propagate underground and are reflected back at the boundaries between the different rock layers. The reflected components of the waves are registered at the surface using highly sensitive sensors (geophones). 3D seismic surveys provide a spatial image of the underground to a depth of more than a kilometre. The results are important for clarifying safety-related questions in the context of site selection for deep geological repositories.
In preparation for the measurements, surveyors will be underway in the field from the middle of September to decide on the exact layout of the measurement lines and cables. The actual measurements will start at the end of October and will last for around 3-4 months.
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|The Permitter-Team (from left to right): Andreas Ebert, Kurt Jäggi, Petra Blaser, Christian Härig, Willibald Zirngast, Peter Steffen, Livia Manser, Andreas Milchrahm, Hansruedi Fisch, Hanspeter Weber.
Source: Schläfli Foto und Digitalstudio Kleindöttingen
|HIGH RESOLUTION PHOTO|
According to Swiss nuclear energy legislation, the producers of radioactive waste are responsible for its safe management and disposal. In 1972, the nuclear power plant operators and the Federal Government set up the National Cooperative for the Disposal of Radioactive Waste (Nagra) to perform this task. Nagra, which has its headquarters in Wettingen (AG), is the national technical competence centre in the field of deep geological disposal of radioactive waste.
Out of a strong sense of responsibility for the long-term protection of man and the environment, 110 employees are involved daily in performing this important work. The high level of competence is secured by targeted research programmes in two Swiss underground rock laboratories and intensive international collaboration.Back