SEISMIC STATIONS SITE-EFFECT FOR THE NATIONAL OPERATIVE TELEMETRIC SYSTEM FOR SEISMOLOGICAL INFORMATION (NOTSSI) NETWORK CALCULATED ON THE BASIS OF MICROSEISMIC NOISE

Proceeding of 1st International Conference on Environmental Protection and Disaster RISKs, 2020, DOI: https://doi.org/10.48365/ENVR-2020.1.31
Emil Oynakov, Dimcho Solakov, Irena Aleksandrova

Abstract:
The present study investigates the characteristics of seismic sites of some of the NOTSSI monitoring network stations, based on microseismic noise. Nakamura’s method of the spectral ratio of the horizontal to the vertical components of the seismic noise (H / V), directly related to the S-wave velocity of distribution (Vs) at the observed site was used for calculating the station repairs. The spectral H / V ratio of the seismic noise for 11 seismic stations is calculated, combined with geological data bellow each station. The values of A0 – site-effect, f0 – resonance frequency and h – depth of reference at the most contrasting resonance boundary were obtained. Attention is paid to seismic instruments and sensors.

Keywords:
earthquake; site-effect; microseismic noise

Acknowledgements:
This work has been carried out in the framework of the National ScienceProgram “Environmental Protection and Reduction of Risks of AdverseEvents and Natural Disasters”, approved by the Resolution of the Councilof Ministers No 577/17.08.2018 and supported by the Ministry of Educationand Science (MES) of Bulgaria(AgreementNo Д01-322/18.12.2019).

Author information:
Author: Emil Oynakov
E-mail: emil.ilievmg@gmail.com
Affiliation: National Institute of Geophysics, Geodesy and Geography – BAS, str. Acad. G. Bonchev, bl. 3, Sofia 1113, Bulgaria

Author: Dimcho Solakov
http://orcid.org/0000-0003-4148-0525
E-mail: dsolakov@geophys.bas.bg
Affiliation: National Institute of Geophysics, Geodesy and Geography – BAS, str. Acad. G. Bonchev, bl. 3, Sofia 1113, Bulgaria

Author: Irena Aleksandrova
E-mail: i.alex@abv.bg
Affiliation: National Institute of Geophysics, Geodesy and Geography – BAS, str. Acad. G. Bonchev, bl. 3, Sofia 1113, Bulgaria

How to cite:
Oynakov, E., Solakov, D., & Aleksandrova, I. (2020). Seismic Stations Site-Effect for the National Operative Telemetric System for Seismological Information (NOTSSI) Network Calculated on the Basis of Microseismic Noise. Proceeding of 1st International Conference on Environmental Protection and Disaster RISKs, 2020, p. 342-352. https://doi.org/10.48365/ENVR-2020.1.31