Definition of the death of seismic events by using digital channel data of the Main center of special control and foreign seismic stations
DOI:
https://doi.org/10.24028/gzh.0203-3100.v40i4.2018.140619Keywords:
seismic station, earthquake, depth, focus, hodograph, seismic wave, macroseismic observationAbstract
Among the main parameters of the source of the seismic event, the depth of the hypocentre is of greatest interest, which, as a rule, is determined with the least accuracy. The knowledge of the exact spatial position of the earthquake foci makes it possible to reveal their connection with the features of the structure of the earth’s crust, primarily with active faults. The solution of these problems is primarily ensured by the use of observational data obtained with the help of local, regional or global networks of digital seismic stations, as well as by improving computer technologies and methods of processing digital seismic data. To determine the parameters of low-energy seismic events, the epicenters of which are located within the platform part of the territory of Ukraine, it is expedient to use the data of instrumental observations obtained with the help of the regional network of digital seismic stations of the Main Center for Special Control (MCSK) of the State Space Agency of Ukraine. To increase the accuracy of localization of seismic events, it is necessary, on the one hand, to significantly expand the network of seismic observations, and on the other, to improve the methods for determining the basic parameters of earthquakes. The article analyzes the basic methods for determining the depths of the hypocenters of seismic events. The program-mathematical support allowing to make the depths of the earthquake foci by records of reflected waves and from the data of macroseismic observations is considered. To estimate the depth of seismic sources from the data of digital seismic channels of the MCSK and foreign seismic stations, the amplitude-frequency characteristics of which are available in the «Geotool», a specialized program «Assessment of depth» has been developed. A number of foreign and domestic seismic stations, most suitable for clarifying the depths of hypocenters of earthquakes from the area of the Vranch Mountains, has been determined. A method for determining the depth of an earthquake source from the area of the Vranch Mountains using data from digital seismic stations located at distances of 20—40 km from the center of a seismically active zone is proposed.
References
Instruction on the order of production and supervision of seismic stations of the USSR’s seismic survey system. Moscow: Publ. house. Institute of Earth Physics, USSR Academy of Sciences (in Russian).
Kanasevich, E. R., (1985). Analysis of time sequences in geophysics. Moscow: Nedra (in Russian).
Kedrov, O. K., (2005). Seismic control methods for nuclear testing (pp. 112, 161—172). Moscow, Saransk: Ed. Institute of Physics of the Earth RAS (in Russian).
Kondorskaya, N. V., & Shebalin, N. V. (Eds.). (1977). New catalog of strong earthquakes on the territory of the USSR (pp. 20, 24, 32, 33). Moscow: Nauka (in Russian).
Arora, S. K., & Manekar, A. M., (1969). Precise determination of epicenters of surface focus seismic events. Bulletin of the Seismological Society of America, 59(2), 777—788.
Arora, S. K. Basu, T. K., & Krishnan, C. A., (1983). Source depth as a useful parameter in the discrimination of earthquakes and undergroubd explosions. Tectonophysics, 91(1-2), 29 — 52.
Сohen, T. J., (1970). Source-depth determination using spectral, pseudo-auto correlation and cepstral analysis. Geophysical journal of the Royal Astronomical Society, 20, 223—231.
Kulhanek, O., (1971). P-wave amplitude spectra of Nevada underground nuclear explosions. Pure and Applied Geophysics, 88(1), 121—136.
Ulrych, T. J., (1971). Application of homomorphic deconvolution to seismology. Geophysics, 36(4), 650—660. https://doi.org/10.1190/1.1440202.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2020 Geofizicheskiy Zhurnal
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).