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Bedrock Fracturing Survey

GTK provides high-quality research data on bedrock fracturing and the location and characteristics of fractures and fault systems. Data on bedrock fracturing is particularly important in rock and tunnel engineering, bedrock storage solutions, and disposal site studies involving geothermal energy and nuclear energy.

Two geologists studying bedrock fractures on the seashore, view from above.

Key benefits

Construction is more affordable on intact bedrock

Intact bedrock blocks offer a safer, easier, and more affordable basis for construction activities. In particular, intact bedrock blocks require less bedrock drilling, which creates financial savings.

Choosing a safe location

In all rock construction – and especially in underground work – it is essential to select a safe, sustainable, and suitable location.

Finland’s most comprehensive research service

GTK uses the most comprehensive mapping data, measurement services and methods in all of Finland. The service includes a comprehensive study of the bedrock, including a survey of the occurring rock types and other regional geological structures such as shear zones, fault zones and other brittle features such as fracture systems.

Data on bedrock fracturing enables underground disposal

The purpose of bedrock fracturing surveys is to avoid building in challenging locations where work would be prolonged, costs would go up, and the risks associated with the construction work would increase. Moreover, the service is designed to prevent work carried out at bedrock sites, affecting the groundwater in the area. At the same time, the aim is to mitigate the risk of process waters migrating in the bedrock as a result of rock construction or disposal site studies.

A bedrock fracturing survey may be conducted in the context of, for example, underground storage of hydrogen or energy storage, construction of a subway tunnel, geothermal energy production, nuclear waste disposal, or site selection for a nuclear power plant.

The service includes different sections that are implemented according to each customer’s individual needs.

As a rule, a preliminary study is conducted to locate potential fracture or fault zones, which often appear on maps as linear structures. In addition, intact bedrock areas are located on the basis of existing data. The data may consist of GTK’s research data as well as the customer’s own reports, such as results from bedrock drilling.

Based on the preliminary study, targeted field studies and geophysical measurements are carried out, as necessary. Consequently, the most suitable drilling sites are selected for further investigations.

Once all the studies have been completed, an assessment is made to determine the impacts of the bedrock structures on the planned rock construction activities or the suitability of the disposal site. Moreover, survey data on bedrock fractioning may also be collected for the purposes of environmental impact assessments (EIA) and other permit reports.

GTK’s service produces regional survey data

At GTK, larger regional scale surveys are also carried out to define shear zones, fault zones and fracture systems.. The survey can be used to identify larger intact areas, which may be useful in the planning of land use for regional projects. However, the service is not suitable for site-specific examinations in construction projects.

Researcher placing a measuring instrument on a bedrock, a sunny summer day and a city in the background.

Åland is home to Finland's largest bedrock outcrops which makes the area an excellent place to study bedrock fracturing.
ARTICLE

Future Energy and Infrastructure Solutions Are Based on Bedrock Fracturing Data

Bedrock and tunnel construction is an integral part of the societal infrastructure. Because of the green transition, projects aiming for more diverse use of geothermal energy are increasing. In these plans, data about bedrock fracturing, the location and characterisation of fractures and fault systems, and related groundwater in bedrock, play a crucial role.

Research on the topic

Explore the topic in depth through scientific publications, articles, research reports, and research projects.

Hydrogen UnderGround (HUG)

Bedrock Fracturing (KARIKKO Project)

SEISMIC RISK – Mitigation of Induced Seismic Risk in Urban Environments

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Senior Specialist
+358295032624

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