Research

Seismological observation

Northern Finland Seismological Network

The network of permanent seismic stations in Finland consists of 15 broadband (BB) and short-period (SP) stations. The Institute of Seismology of Helsinki University operates 12 stations located primary on the territory of southern Finland. Sodankylä Geophysical Observatory of Oulu University operates three permanent broadband seismic stations located in the northern part of Finland. The stations form the real-time Northern Finland Seismological Network (FN). The main target is recording, analysis and archiving of seismological data for earthquake research. The network was established in 2005, after Sodankylä Geophysical Observatory modernized its own short-period seismic stations.

At the moment stations are equipped with Streckeisen STS-2 VBB (very broadband) seismometers, Earth Data PS-2400 24-bit digitizers and Linux PC with SeisComP (Seismological Communication Processor) software developed at the GeoForschungsZentrum Potsdam (Germany). The stations are connected to the data center at Oulu via Internet. Data acquisition, recording, archiving, control and transfer of the data from stations to the data server at Oulu is made using SeedLink protocol. Since 2006 the Northern Finland Seismological Network is a part of GEOFON Extended Virtual Network.

Seismic stations of the Northern Finland Seismological Network

Station	Code	Lat. N (deg)	Long. E (deg)	Elevation(m)	Sensor	Data aquisition	Data transfer	Data format	Start of operation
Oulu, Huttukylä	OUL	65.085	25.896	60	Streckeisen STS-2	EarthData+SeisComP	InternetASDL	mSEED	10.08.2005
Kuusamo, Maaselkä	MSF	65.911	29.040	365	Streckeisen STS-2	EarthData+SeisComP	Internet WLAN	mSEED	17.10.2005
Sodankylä	SGF	67.442	26.526	180	Streckeisen STS-2	EarthData+SeisComP	Internet WLAN	mSEED	04.01.2006
Rovaniemi	RNF	66.612	26.010	198.1	Streckeisen STS-2	EarthData+SeisComP	Internet WLAN	mSEED	06.11.2007

Map of the stations
SeedLink network in FN (Northern Finland Seismological Network) stations

Data

All the stations are registering three-component (Z, N, E) continuous data at sampling rate of 100 sps.
From this data the following continous datastreams are stored in miniSEED format:

HH* 100 sps
BH* 20 sps
LH* 1 sps
VH* 0.1 sps

All seismograms (dailyplots)
Realtime seismograms
Links