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1

Diurnal seismic ambient noise and seismic station performance characterization in the Bengal Basin, Bangladesh

Zannat Naharin, Farazi Atikul Haque, Kamal A. S. M. Maksud, Rahman Md. Zillur, Hossain Md. Shakhawat

Geology, Geophysics and Environment

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2023

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Vol. 49, no. 3

209--224

EN

Seismic ambient noise (SAN) energy can potentially blur regional and teleseismic arrivals as well as various microearthquakes at specific frequencies. Therefore, quantification of the SAN energy level in a region is required to optimize seismic station distribution for seismological investigations. Moreover, evaluation of station performance and noise source is possible from observation of SAN energy levels. The SAN energy distribution from seismic stations in the Bengal Basin (BB), Bangladesh has not yet been estimated. At the same time, this tec-tonically active and complex region is less studied using seismic methods. This study aims to quantify SAN energy and characterize its diurnal variation along with evaluating station performance at 11 seismic stations, which were temporarily installed in the deeper portion of the BB. Herein, the daily SAN energy level was determined within the period range of 0.02–30 s by estimating the power spectral density (PSD) of seismic data for 7 continuous days. SAN energy and its variation over time were observed using the probability density functions (PDFs) of PSDs and spectrograms, respectively. The sources of SAN energies at different period bands were also investigated by comparing the PSDs with daily variations in human activities, nearby noise sources, local meteorological factors (i.e., air temperature and precipitation), and sea level height. The insights from this study could be useful for the future deployment of seismic networks as well as seismological studies in the BB.

2

Tram type influence on the frequency spectrum character of the subsoil dynamic response

Stolarik M., Pinka M., Nedoma J., Fajkus M., Martinek R.

Przegląd Elektrotechniczny

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2018

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R. 94, nr 11

96--100

EN

This article deals with the results of the experimental seismic measurement using a standard seismic in situ station on a rock mass where the influence of the type of the trams passing on the frequency spectrum characteristics, the bandwidth and the maximum peaks was monitored. The goal of presented experimental measurement was to verify whether it is possible to find common patterns for individual types of tram cars in the frequency spectra using standard equipment for seismic measurements. The results show that in the spectrums certain characteristics can be traced, which are common to both a particular type of tram and a common group of tram types historically or structurally derived from each other.

PL

W artykule przedstawiono badania sejsmiczne związane z przejazdem różnych typów tramwajów. Przedstawiono charakterystyki widmowe oraz monitorowano pasmo częstotliwości. Ekspeyment wykazał że każdy z pojazdów jak również każdy typ pojazdu ma typową dla siebie charakterystykę sejsmiczną.

3

Temporary seismic station Czajcze (CZA) in Poland, 1997-1999

Wiejacz P.

Acta Geophysica Polonica

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2000

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Vol. 48, nr 2

207-214

EN

Temporary seismic station "Czajcze" in northwestern Poland operated in the years 1997-1999. This paper is a summary of its activity and various issues encountered, and of the seismic events recorded in the period of its existence.