K¨ovesligethy Rad´oSeismological Observatory HUNGARIAN NATIONAL SEISMOLOGICAL BULLETIN 2011 MTA CSFK GGI - BUDAPEST - HUNGARY Hungarian National Seismological Bulletin 2011 Authors: Zolt´anGr´aczer Tibor Czifra M´artaKiszely P´eterM´onus Tibor Zs´ıros MTA CSFK GGI K¨ovesligethy Rad´oSeismological Observatory Budapest, Hungary 2012 Reference: Gr´aczer,Z., Czifra, T., Kiszely, M., M´onus, P., Zs´ıros,T., 2012. Hungarian National Seismological Bulletin 2011, K¨ovesligethy Rad´oSeismological Observatory, MTA CSFK GGI, Budapest, 357pp. Publisher: Dr. J´ozsefZ´avoti ISSN 2063-8558 This work is licensed under a Creative Commons License. cbed http://creativecommons.org/licenses/by-nc-nd/3.0/ Contents 1 Local earthquakes 9 2 Focal mechanisms 129 3 Macroseismic data 131 4 Regional and teleseismic earthquakes 143 5 References 355 5 Foreword This publication reports the results of the seismological routine work performed at the K¨ovesligethy Rad´oSeismological Observatory. The Observatory belongs to the Geodetical and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, Hungar- ian Academy of Sciences (MTA CSFK GGI). Until the beginning of the year 2012 the Observatory was part of the Geodetical and Geophysical Research Institute of Hungarian Academy of Sciences (MTA GGKI), but because of the structural reform at the Hungarian Academy of Sciences the Institute joined to the new research center, MTA CSFK and has changed its name to MTA CSFK GGI. The Institute will be referred as GGI throughout the Bulletin. The main objectives of the Observatory are operating the Hungarian National Seismo- logical Network and conducting seismological research for the better understanding of the seismicity and structure of the Pannonian basin. It has been running a SeisComp3 (http://www.seiscomp3.org) based automatic hypocentre location service whose results are published on the web (http://www.seismology.hu) and simultaneously email alerts are sent to the Hungarian National Directorate General for Disaster Management. The predecessor of the GGI has published microseimic bulletins for the territory of Hun- gary up to the year 1978. After a long hiatus, seismological bulletins have been newly published by the cooperation of the GGI and the Georisk Ltd. starting from 2002. From this year onward the GGI will release the seismological bulletin independently under its own name in a renewed form with extended data content. Focal parameters and phase readings of the local earthquakes are listed in Chapter 1. The origin of the events (earthquake or explosion) were determined based on the characteristics of the recordings. In Chapter 2 the focal mechanisms of those earthquakes are shown where there were sufficient polarity data to obtain reliable results. In Chapter 3 the macroseismic data of the Hungarian earthquakes reported by the public are displayed. In Chapter 4 the phase and polarity data of the regional and teleseismic earthquakes recorded at the Hungarian seismological stations are reported. The focal parameters shown there come from the real time seismicity data of the European{Mediterranean Seismological Centre (http://www.emsc-csem.org). 7 1. Local earthquakes Data sources During the year 2011 the Hungarian National Seismological Network operated by the Observatory consisted of 6 broadband stations (BEHE, BUD, MORH, PSZ, SOP, TRPA) and one short period station (CSKK). In the first four months of the year { based on an agreement between GGI and the Georisk Ltd. { the Observatory could access the data of further 7 seismological stations equipped with short period seismometers (PKS2, PKS6, PKS7, PKS9, PKSG, PKSN, PKST) and one with broadband seismometer (PKSM). After the Oroszl´any earthquake of 2011.01.29 the E¨otv¨osLor´andGeophysical Institute installed two short period stations (BOKD, VSOM) near the epicentral zone which had been operated for 1.5 months and their data was shared with the GGI. Besides, the Observatory deployed a temporary station (SUKH) in the Velence Hills which has worked until the middle of March. The data coming from these stations have been collected and stored in the Observatory using the SeisComp3 software package (www.seiscomp3.org). Table 1.1 contains the parameters of permanent and temporary Hungarian seismological stations operated by various organizations whose data have been used during the location of the detected earthquakes. The position of the stations are shown in Fig. 1.1. The description of the stations whose data were used in the computations but are situated in the neighbour- ing countries can be found in the publications of the respective operating institutions (Zentralanstalt f¨ur Meteorologie und Geodynamik, Austria; Geofyzik´alni´ustav Akademie vˇed Cesk´erebubliky,ˇ Czech Republic; Urad za seizmologijo in geologijo - Agencija Republike Slovenije za okolje, Slovenia; Geofyzik´alny ´ustav - Slovensk´aakad´emiavied, Slovakia; Institutul National pentru Fizica Pamantului, Romania). Earthquake location In the case of the Hungarian seismological stations, the wave phases have been picked at the Observatory, while in the case of foreign stations the monthly phase data reports of the partner organizations have been used. In the year 2011, 393 earthquakes and explosions have been located by the Observatory in the area confined by the latitudes 45.5-49.0◦N and longitudes 16.0-23.0◦E (Table 1.2 and Fig. 1.2). The phase picking and magnitude determination was carried out using the Seismic Handler software package (Stammler, 1993). The hypocenter location was performed using the HYPO71PC computer program (Lee and Lahr, 1975). The location was based on the three-layered velocity model of M´onus (1995): Depth range (km) P-wave velocity (km/s) S-wave velocity (km/s) 0-20 5.60 3.15 20-31 6.57 3.69 31- 8.02 4.51 9 CHAPTER 1. LOCAL EARTHQUAKES The focal parameters and the phase readings of the located earthquakes are given in a form which is based on the Seisan (Havskov and Ottemoller, 1999) bulletin format. The abbreviations used in the listings are: Hour: Origin time in UTC (hr. min. and sec.) Lat: Latitude of epicenter Lon: Longitude of epicenter Depth: Focal depth in kilometer (trailing F indicates fixed depth) Magnitude: the local magnitude value is given Rms: Root mean square value of travel time residuals Gap: Largest azimuthal separation in degrees between stations. Erh: Standard error of the epicenter. If Erh={, it means that Erh could not be computed because of insufficient data. Erz: Standard error of the focal depth. If Erz={, it means that Erz could not be computed because the focal depth is fixed or because of insufficient data. STAT: Station code CO: Component, S: short period, L: long period, B: broadband, DIST: Epicenter distance (km) AZI: Azimuth from source to station PHASE: Phase; The first letter characterizes onset E(mergent) or I(mpulsive) P: Polarity (C for compression, D for dilatation ) HR: Hour MN: Minute SECON: Seconds TRES: Residual (seconds) CODA: Signal duration in seconds AMPL: Ground Amplitude (0.5*(peak to peak)), (nm) at period PERI PERI: Period where amplitude is measured BAZ: Back azimuth (station to event) ARES: Back azimuth residual VELO: Apparent phase velocity (km/sec) WT: Weight of phase in the location 10 CHAPTER 1. LOCAL EARTHQUAKES Table 1.1: Parameters of the Hungarian seismological stations Station Lat (◦N) Lon (◦E) Height (m) Sensora Acquisitionb Org.c Periodd BEHE PS-6-24 46.4706 16.7757 289 STS-2 GGI 01.01-12.31 Becsehely SeisComp PC BUD PS-6-24 47.4836 19.0239 169 STS-2 GGI 01.01-12.31 Budapest SeisComp PC BOKD 47.4889 18.2517 150 L4 REFTEK ELGI 02.01-04.13 Bokod CSKK K2 47.3631 18.2605 319 SS-1 GGI 01.01-12.31 Cs´okak}o SeisComp PC MORH PS-6-24 46.2149 18.6435 135 STS-2 GGI 09.09-12.31 M´or´agy SeisComp PC PKS2 46.4920 19.2131 106 LE-3D MARS-88OC GR 01.01-04.31 Kecel PKS6 46.5998 19.5645 120 LE-3D MARS-88OC GR 01.01-04.31 B´ocsa PKS7 47.0473 19.1609 95 LE-3D MARS-88OC GR 01.01-04.31 Kunszentmikl´os PKS9 46.5870 18.2789 240 LE-3D MARS-88OC GR 01.01-04.31 Tam´asi PKSG MARS-880MC 47.3918 18.3907 200 LE-3D GR 01.01-04.31 G´ant SeisComp PC PKSM PS-6-24 GGI 46.2119 18.6413 170 STS-2 01.01-04.31 M´or´agy SeisComp PC GR PKSN 46.8970 19.8667 110 LE-3D MARS-88OC GR 01.01-04.31 Ny´arl}orinc PKST MARS-88MC 47.2590 18.0343 437 LE-3D GR 01.01-04.31 T´es SeisComp PC PSZ PS-6-24 GEOFON 47.9184 19.8944 940 STS-2 01.01-12.31 Piszk´estet}o SeisComp PC GGI SOP PS-6-24 47.6833 16.5583 260 STS-2 GGI 01.01-12.31 Sopron SeisComp PC SUKH PS-6-24 47.2424 18.6165 100 SS-1 GGI 01.01-03.16 Sukor´o SeisComp PC TRPA PS-6-24 48.1304 22.5391 113 STS-2 GGI 01.01-12.31 Tarpa SeisComp PC VSOM 47.5066 18.3757 150 L4 REFTEK ELGI 02.01-04.13 V´ertessoml´o a L4 { Mark Products L-4 seismometer LE-3D { Lennartz 1Hz seismometer SS-1 { Kinemetrics SS-1 short period seismometer STS-2 { Streckeisen broadband seismometer b Data acquisition units (at all stations the recording is digital and continuous): K2 { Kinemetrics K2 data acquisition system MARS-88 { Lennartz data acquisition system PS-6-24 { Earth Data digitizer REFTEK - REFTEK digitizer and data acquisition system SeisComp - Geofon Seismological Communication Processor c Operating organization: ELGI - E¨otv¨osL´or´andGeophysical Institute, Hungary GEOFON - GEOFON Global Seismic Network, GFZ, Germany GGI { Geodetic and Geophysical Institute, MTA CSFK, Hungary GR { GeoRisk Earthquake Engineering Ltd., Hungary d Availability period in 2011 11 CHAPTER 1.