1. When will you be finished?
We are working as quickly as we can while striving to cause as little inconvenience to residents as possible. We have divided the 500 km2 area into two halves, south and north. In January, we finished the southern half and expect to complete the northern half by the end of February.
This means that, according to plan, we will have completed the entire survey by 1 March. While the cold weather makes it easier to drive vibration trucks on and around the fields, the frost makes it difficult for us in other ways – for example, when we need to place geophones in the ground. The weather may challenge the schedule, but we will provide as much information as possible on our website, in our newsletter and in the media.
You can follow the vibration trucks’ routes on this map, where you can also enter your address and see when we will be in your area.
2. What are geophones and what are they used for?
Geophones are small receiving devices that pick up and record signals from underground layers at depths of up to 3,000 metres. The signals come from sound waves that a vibration truck sends into the ground.
We use two different types of geophones. In cities, these are small square boxes attached to lampposts or placed in hedges. They have a small note with our contact details and a request that they be left in place. Outside cities, we use small orange devices that are 13 cm high and approximately 5 cm in diameter.
The geophones are placed approximately 20 metres apart in north-south lines with 160 metres between them. They are laid out on foot and collected again after a couple of weeks.
3. Why are there bamboo sticks with reflectors along the roads?
Before the geophones are laid out, each location will be marked with a bamboo stick. The sticks do not mark where the vibration truck will stop and vibrate, but only where a geophone will be placed.
4. What are the blue bands that have been put up in urban areas?
Like the bamboo sticks, the blue tape marks where we will place geophones. They have been placed in urban areas, for example in hedges, around lampposts or other visible locations. The blue tape is biodegradable and will disappear on its own after a few weeks. We hope that the blue ribbons, sticks and other markings will be left in place, as this will be a great help to us and contribute to us completing the survey more quickly.
5. What is the purpose of the survey?
The purpose of the seismic survey is to obtain a detailed picture of the underground structures down to a depth of 3,000 metres. What do the different layers consist of? How thick are they? The data collected will be processed and analysed and will play an important role in deciding whether the area is suitable for geological storage of CO2.
If you have any questions about the survey, please send an email to seismik@greenstore.dk or call 60 36 25 40.
