Bulletins of seismic events recorded by the Czech Regional Seismological Network
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| Explanatory notes |
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Annual seismological bulletins contain the final analysis of seismic events recorded by Czech seismological
observatories Prùhonice (PRU), Ka¹perské Hory (KHC), Dobru¹ka/Polom (DPC), Nový Kostel (NKC), Panská Ves (PVCC), Tøe¹» (TREC),
Praha (PRA), Ostrava/Krásne Pole (OKC), Vranov (VRAC), Moravský Beroun (MORC), Moravský Krumlov (KRUC), and Velká Javorina
(JAVC).
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Stations Prùhonice, Ka¹perské Hory, Dobru¹ka/Polom, Nový Kostel, Panská Ves and Tøe¹» are maintained by the
Geophysical Institute of the Academy of Sciences of the Czech Republic. Station Prague is operated by the Institute of
Geophysics, Charles University, Prague. Station Ostrava/Krásne Poleis operated by Technical University Ostrava/Institute of
Geonics of the Academy of Sciences of the Czech Republic, Ostrava. Stations Vranov, Moravský Beroun, Moravský Krumlov and
Velká Javorina are operated by the Institute of Physics of the Earth, Masaryk University, Brno.
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The seismogram analysis was made by standard methods described e.g. in [1]. Distant earthquakes were analyzed
according to Jeffreys-Bullen travel time tables [2]; Gutenberg-Richter tables [3] were used for the preliminary analysis of
deep shocks. Special local tables [4] were used for the analysis of near shocks. The magnitudes of distant earthquakes were
determined on the basis of the standard calibrating curves [5,6]; near shocks were classified by means of special curves [7].
The subsequent data processing was performed by the system described in [8]. The processed data were combined with the focal
parameters determined by the I.S.C. [9]. The names of geographic regions are supplemented by the code corresponding to the
division introduced by Flinn and Engdahl [10]. Local shocks probably due to industrial explosions are denoted by a code number
997. Near shocks of unknown epicentres are denoted by 999.
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Unidentified distant events without determined parameters have a code number 998. The parameters of weak near shocks
which could not be located by the international centres, but were also recorded by some other Central European observatories
were calculated by program LOKACE [11]. The resulting parameters are given in the header the located shock. The depth of
regional shocks is not determined. Phase readings of local shocks (mainly due to industrial explosions) with epicentral
distances less than about 1.5 deg. are not includedinto the bulletins.
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The bulletin was prepared at the Geophysical Institute AS CR, Prague. |
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Older printed bulletins (station Cheb 1908-1954, station Praha 1928-1954) were scanned in the frame of the European
project EuroSeismos and are available on the web pages of the INGV, Rome. Be careful, pdf files are rather large (up to 750
MB) and it takes quite long to open them. We recommend to save a requested bulletin to a local disk first.
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| Reference |
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[1] Bulletin of the Czechoslovak Seismological Stations Prùhonice, Praha and Ka¹perské Hory 1988,
Geophys.Inst.Czechosl.Acad.Sci., Praha, 1992.
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[2] H.Jeffreys, K.E.Bullen, Seismological tables, London 1967. |
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[3] B.Gutenberg, C.F.Richter, Publ. Bur. Centr. Seism. Int., Travaux Scientifiques, A 15, 1937, 3. |
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[4] V.Kárník, Zemìtøesení v Novohradských horách (Nograd) 20.11.1951 (In Czech). Travaux Inst. Geophys. Acad.
Tchecosl. Sci. No.2 (1953), Academia, Praha 1954, 17.
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[5] V.Kárník, N.V.Kondorskaya, J.V.Riznichenko, S.L.Solovyev, N.V.Shebalin, J.Vanìk, A.Zátopek, Standardization of
the Earthquake Magnitude Scale. Studia geoph. et geod. 6, 1962, 41.
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[6] B.Gutenberg, C.F.Richter, Earthquake Magnitude, Intensity, Energy, and Acceleration. Bull. Seism. Soc. Am., 46,
1956, 105.
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[7] V.Kárník, Seismicity of the European Area. Part I., Academia, Prague, 1968. |
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[8] K.Klíma, L.Ruprechtová, Computer Treatment of Seismological Network Data. Travaux Inst. Geophys. Acad. Tchecosl.
Sci. No.537 (1980),Academia, Praha 1982, 15.
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[9] Bulletin of International Seismological Centre 1989, Newbury 1991. |
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[10] E.A.Flinn, E.R.Engdahl, A Proposed Basis for Geographical and Seismic Regionalization. Rev. Geophys. 3, 1965,
123.
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[11] K.Klíma, M.Musil, Program LOKACE, Geophys.Inst., Prague 1987 |
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| List of symbols |
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(Standard symbols generally used are not included) |
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mb - body wave magnitude |
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MS - surface wave magnitude |
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Mw - moment magnitude |
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ML - local magnitude |
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PKP - core wave, not exactly identified |
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PKIKP - core wave travelling through the Earth's inner core |
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PKHKP - core wave refracted on a discontinuity between the outer and inner core boundaries, preceding PKIKP at
distances
smaller than about 142 deg.
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PKP1, PKP2 - core waves penetrating only into the outer core |
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TV, AV, MV - period, maximum amplitude and body wave magnitude measured in the short-period vertical record in the
interval of 5s after the first onset
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TW, AW, MW - the same measured in the interval of 20s after the first onset |
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TZ, AZ, MZ - period, maximum amplitude and corresponding magnitude measured in the medium-period vertical record
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TN, AN, MN - the same measured in the individual record of medium-period horizontal component NS |
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TE, AE, ME - the same measured in the individual record of medium-period horizontal component EW |
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TH, AH, MH - period, maximum amplitude and corresponding magnitude for the total horizontal component |
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Di - epicentral distance determined by the record analysis |
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Dc - epicentral distance calculated for the final earthquake parameters |
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