AlpArray in Hungary: temporary and permanent seismological networks in the transition zone between the Eastern Alps and the Pannonian basin

Abstract

In the last few decades dense large-scale seismic networks showed their importance in studying the structure of the lithosphere and the upper mantle. The better understanding of the Apennines-Alps-Carpathian-Dinarides system is the main target of the AlpArray European international initiative in which more than 50 institutes are involved. The core of AlpArray is the AlpArray Seismic Network (AASN). With its $ 600 broadband seismic stations ( $ 280 of which are temporary) the AASN is, so far, the largest passive seismic experiment in Europe. The MTA CSFK Geodetic and Geophysical Institute, as a Core Member of the AlpArray project, contributes to the AlpArray Seismic Network with its entire permanent network as well as with 11 temporary broadband seismic stations deployed in Western Hungary. Three additional station equipment were provided by the Swiss-AlpArray SINERGIA program. The average station distance together with the permanent stations is around 40 km in the area of interest. The temporary network has been installed between December 2015 and July 2016 and the planned operation period is 3 years. In this paper we describe the characteristics of the 29 permanent and temporary stations, introducing not only the equipment, but the location, housing and geological setting, as well. We present median power spectral density curves in order to characterise the noise conditions at each station.

Long term measurements from the Mátra Gravitational and Geophysical Laboratory

“…According to the historical collected data on average one earthquake with magnitude M ≥ 5.0 can be observed in the Carpatho-Pannonian region annualy. Also the seismic activity from neighbouring open pit mines can be identified by the ET1H seismological station deployed in the MGGL with the help of the stations of the Hungarian National Seismological Network [14]. The level of seismic activity in the Mátra Mountains is quite low.…”

Hierarchical cluster analysis and multiple event relocation of seismic event clusters in Hungary between 2000 and 2016

“…org/networks/detail/HU/, doi:https://doi.org/10.14470 /UH028726) operated by the Research Centre for Astronomy and Earth Sciences, Geodetic and Geophysical Institute, Kövesligethy Radó Seismological Observatory of the Hungarian Academy of Sciences (KRSZO), had various permanent stations at this time interval. We also used waveforms recorded by the temporary AlpArray Seismic Network (AASN, doi:https://doi.org/10.12686/alparray/z3_2015, Hetényi et al 2018;Gráczer et al 2018) that provides data from 1 January 2016, and by the Paks Microseismic Monitoring Network (PMMN, doi:https://doi. org/10.7914/SN/HM) operated by Georisk Ltd., as well as further permanent stations in neighboring countries.…”

Preliminary Moho depth determination from receiver function analysis using AlpArray stations in Hungary

“…The AlpArray seismic network provides uniform coverage of the greater Alpine area with seismometers deployed at unprecedented density. This presents 220 permanent and 350 temporary AlpArray seismological broadband stations (Hetényi et. al.…”

“…Integrated Data Archive). The Hungarian component of this network consists of 14 broadband stations in addition to the 9 permanent stations of the Hungarian National Seismological Network (HNSN)(Gráczer et al 2018). The experiment has officially started on January 1, 2016.…”