Bulletins of seismic events recorded by the Czech Regional Seismological Network


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Explanatory notes
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).
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.
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.
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.
The bulletin was prepared at the Geophysical Institute AS CR, Prague.
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.

Reference
[1] Bulletin of the Czechoslovak Seismological Stations Prùhonice, Praha and Ka¹perské Hory 1988, Geophys.Inst.Czechosl.Acad.Sci., Praha, 1992.
[2] H.Jeffreys, K.E.Bullen, Seismological tables, London 1967.
[3] B.Gutenberg, C.F.Richter, Publ. Bur. Centr. Seism. Int., Travaux Scientifiques, A 15, 1937, 3.
[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.
[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.
[6] B.Gutenberg, C.F.Richter, Earthquake Magnitude, Intensity, Energy, and Acceleration. Bull. Seism. Soc. Am., 46, 1956, 105.
[7] V.Kárník, Seismicity of the European Area. Part I., Academia, Prague, 1968.
[8] K.Klíma, L.Ruprechtová, Computer Treatment of Seismological Network Data. Travaux Inst. Geophys. Acad. Tchecosl. Sci. No.537 (1980),Academia, Praha 1982, 15.
[9] Bulletin of International Seismological Centre 1989, Newbury 1991.
[10] E.A.Flinn, E.R.Engdahl, A Proposed Basis for Geographical and Seismic Regionalization. Rev. Geophys. 3, 1965, 123.
[11] K.Klíma, M.Musil, Program LOKACE, Geophys.Inst., Prague 1987

List of symbols
(Standard symbols generally used are not included)
mb - body wave magnitude
MS - surface wave magnitude
Mw - moment magnitude
ML - local magnitude
PKP - core wave, not exactly identified
PKIKP - core wave travelling through the Earth's inner core
PKHKP - core wave refracted on a discontinuity between the outer and inner core boundaries, preceding PKIKP at distances smaller than about 142 deg.
PKP1, PKP2 - core waves penetrating only into the outer core
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
TW, AW, MW - the same measured in the interval of 20s after the first onset
TZ, AZ, MZ - period, maximum amplitude and corresponding magnitude measured in the medium-period vertical record
TN, AN, MN - the same measured in the individual record of medium-period horizontal component NS
TE, AE, ME - the same measured in the individual record of medium-period horizontal component EW
TH, AH, MH - period, maximum amplitude and corresponding magnitude for the total horizontal component
Di - epicentral distance determined by the record analysis
Dc - epicentral distance calculated for the final earthquake parameters