Network of Seismic Stations

The role of the Finnish seismic network is to record seismic waves from earthquakes, explosions and other seismic events in order to identify, locate and determine the magnitudes of the events. A comprehensive national seismic network is essential for seismological research, observational activities, and government regulations for seismic hazard mitigation and the nuclear test-ban treaty verification. Research is focused on topics such as lithospheric structure and intraplate seismicity. At present, the network is comprised of 31 permanent stations located throughout Finland and the database is maintained in the Institute of Seismology, situated in Helsinki. The Finnish seismic network is part of the Global Seismographic Network and the recordings and observational data are forwarded to several international seismic data centers (ORFEUS, ISC, EMSC, IRIS, GEOFON).

FINES is a small aperture array station comprised of 16 substations and is one of 50 primary monitoring stations of the Comprehensive Nuclear-Test-Ban-Treaty Organization (CTBTO). The objective of this seismic monitoring is to detect and locate underground nuclear explosions. The seismic data are used to distinguish between an underground nuclear explosion and the numerous natural and man-made seismic events that occur every day, such as earthquakes and mining explosions.

Mobile seismic stations are used to study: the structure of the lithosphere, spatial and temporal seismicity in intraplate settings especially in postglacial faults, the reasons behind periodic swarms of earthquakes, mineral deposit systems and their location and genesis in relation to crustal and lithospheric structures, induced seismicity generated in hydraulic stimulation experiments in deep bedrock, and how to estimate and mitigate seismic risk in environments with shock sensitive high technology installations.

Since 2003, a network of 3-6 stations has been in operation in the seismically active area of Kuusamo. The aim of the project is to gather a comprehensive database for studies focused on understanding earthquake source mechanisms, as well as determining the crustal velocity model, stress field and active faults in the area.

Data from the Pyhäjoki network are used to study: intraplate seismicity, crustal structure, nuclear safety monitoring and the development of new monitoring methods. The network is included in the Institute's seismic network and this improves seismic analysis results, especially in the Bothnian Bay area. The Pyhäjoki network is also used to study and map faults in the area.

The seismic broadband station ABOA has been in operation since 2007. The station is situated at the Finnish Antarctic research station Aboa in Queen Maud Land, Antarctica. Data collected from this station are used in cryoseismology and studies of the local seismicity. Cryoseismic research involves quantitative studies of ice processes that are known or are suspected to show sensitivity to climate change. The data are also used for studies of structure of the crust and upper mantle.