We are proposing a hypothesis that earthquake swarms in the West Bohemia/Vogtland seismoactive region are generated by magmatic activity currently transported to the upper crustal layers. We assume that the injection of magma and/or related fluids and gases causes hydraulic fracturing which is manifested as an earthquake swarm at the surface. Our statements are supported by three spheres of evidence coming from the western part of the Bohemian Massif: characteristic manifestations of recent geodynamic activity, the information from the neighbouring KTB deep drilling project and from the 9HR seismic reflection profile, and the detailed analysis of local seismological data. (1) Recent manifestations of geodynamic activity include Quaternary volcanism, rich CO 2 emissions, anomalies of mantle-derived 3 He, mineral springs, moffets, etc. (2) The fluid injection experiment in the neighbouring KTB deep borehole at a depth of 9 km induced hundreds of micro-earthquakes. This indicates that the Earth's crust is near frictional failure in the western part of the Bohemian Massif and an addition of a small amount of energy to the tectonic stress is enough to induce an earthquake. Some pronounced reflections in the closely passing 9HR seismic reflection profile are interpreted as being caused by recent magmatic sills in the crust. (3) The local broadband seismological network WEBNET provides high quality data that enable precise localization of seismic events. The events of the January 1997 earthquake swarm are confined to an extremely narrow volume at depths of about 9 km. Their seismograms display pronounced reflections of P- and S-waves in the upper crust. The analysis of the process of faulting has disclosed a considerable variability of the source mechanism during the swarm.
We conclude that the mechanism of intraplate earthquake swarms generated by magma intrusions is similar to that of induced seismicity. As the recent tectonic processes and manifestations of geodynamic activity are similar in European areas with repeated earthquake swarm occurrence (Bohemian Massif, French Massif Central, Rhine Graben), we assume that magma intrusions and related fluid and gas release at depths of about 10 km are the universal cause of intraplate earthquake swarm generation
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
Antonini M., 1988: Variations in the focal mechanisms during the 1985/86 Western Bohemia earthquake sequence — correlation with spatial distribution of foci and suggested geometry of faulting. in Induced seismicity and associated phenomena (ed. D. Procházková), Geophys. Inst. Praha, pp. 250–270.
Babuška V. and Plomerová J., 1987: Deep tectonics of the lithosphere in western part of the Bohemian Massif, in Earthquake Swarm 1985/86 in Western Bohemia, (ed. D. Procházková), Geophys. Inst. Praha, pp. 30–33.
Bonjer K.-P., 1997: Seismicity pattern and style of seismic faulting at the eastern borderfault of the southern Rhine Graben. Tectonophysics, 275, 41–69.
Bucha V. and Bllžkovský M. (editors), 1994: Crustal structure of the Bohemian Massif and the West Carpathians. Academia, Prague, pp. 1–355.
Cameli, G. M., Dini I. and Liotta D., 1993: Upper crustal structure of the Larderello geothermal field as a feature of post-collisional extensional tectonics (Southern Tuscany, Italy). Tectonophysics, 224, 413–423.
Cosgrove J.W., 1997: The influence of mechanical anisotropy on the behaviour of the lower crust. Tectonophysics, 280, 1–14.
Čermák V., Šafanda J., Krešl M. and Kučerová L., 1996: Heat flow studies in Central Europe with special emphasis on data from former Czechoslovakia. Global Tect. and Metallogeny, 5,3/4, 109–123.
Dahlheim H.-A., Gebrande H., Schmedes E. and Soffel H., 1997: Seismicity and stress field in the vicinity of the KTB location. J. Geophys. Res., 102,B8, 18.493–18.506.
Dorel J., Fourvel, D. and Donnadieu G., 1995: Etude de la seismicité de l'Auvergne et des régions limitrophes (Massif central francais). Bull. Soc. géol. France, 166,3, 271–284.
Fischer T. and Hampl F., 1995: Seisbase 4.6 — a database oriented program for routine multi-station seismograms analysis. In: Proceedings and Activity Report 1992–1994, XXIV General Assembly of the European Seismological Commission, Volume I, Athens, Greece, 1994, September 19–24, Univ. of Athens, 1995, 120–128.
Fuchs K., Bonjer K.-P., Gajewski D., Lüschen E., Prodehl C., Sandmeier K.-J., Wenzel F. and Wilhelm H., 1987: Crustal evolution of the Rhinegraben area, I. Exploring the lower crust in the Rhinegraben rift by unified geophysical experiments. Tectonophysics, 141, 261–275.
Gajewski D. and Pšenčik I., 1989: Ray synthetic seismograms in 3-D laterally inhomogeneous anisotropic structures — Program ANRAY89. Internal report, Centre for Computational Seismology, Lawrence Berkley Lab., Berkley.
Gianelli G., Manzella A. and Puxeddu M., 1997: Crustal models of the geothermal areas of southern Tuscany (Italy). Tectonophysics, 281, 221–239.
Granet, M., Wilson M. and Achauer U., 1995: Imaging a mantle plume beneath the Massif Central (France). Earth Planet Sci. Lett., 136, 281–296.
Griesshaber E., O'Nions R.K. and Oxburgh E. R., 1992: Helium and carbon isotope systematics in crustal fluids from the Eifel, the Rhine Graben and Black Forest, F.R.G. Chemical Geology, 99, 213–235.
Grünthal G., 1989: About the history of seismic activity in the focal region Vogtland/Western Bohemia. In Monitoring and analysis of the earthquake swarm 1985/86 in the region Vogtland/Western Bohemia (ed. P. Bormann), Potsdam, pp. 30–34.
Grünthal G., Schenk V., Zeman A. and Schenková Z., 1990: Seismotectonic model for the earthquake swarm of 1985–1986 in the Vogtland/West Bohemia focal region. Tectonophysics, 174, 369–383.
Hampl F., Fischer T., Horálek J., Boušková A., Jedlička P., Jíra T. and Brož M., 1995: Local West Bohemian seismological network WEBNET. Extended abstract. In: Proceedings and Activity Report 1992–1994, XXIV General Assembly of the European Seismological Commission, Volume II, Athens, Greece, 1994, September 19–24, Univ. of Athens, 1995, 789–794.
Heinicke J., Koch U. and Martinelli G., 1995: CO2 and Radon measurements in the Vogtland area (Germany) — a contribution to earthquake prediction research. Geophys. Res. Letters, 22,7, 771–774.
Herrman R. B., 1979: FASTHYPO — a hypocentre location program. Earthquake Notes, 50,No.2, 25–38.
Hill D.P., 1977: A model for earthquake swarms. J. Geophys. Res., 82,8, 1347–1352.
Hooker P.J., Bertrami R., Lombardi S., O'Nions R. K. and Oxburgh E. R., 1985: Helium-3 anomalies and crust-mantle interaction in Italy. Geochimica et Cosmochimica Acta, 49, 2505–2513.
Horálek J., Boušková A. and Hampl F., 1995: Local seismic observations at stations Nový Kostel and Skalná, and their interpretation: period 1986–93. Studia geoph. et geod., 39, 148–161.
Horálek J., Hampl F., Boušková. A. and Fischer T., 1996: Seismic regime of the West Bohemian earthquake swarm region: preliminary results. Studia geoph. et geod., 40, 398–412.
Horálek J., Málek J. and Janský J., 1998: A 1-D seismic model for the West-Bohemian earthquake swarm region with variable, azimuthally dependent P-wave velocities. Pure Appl. Geophys. (submitted).
Jost M. L., Büßelberg T., Jost Ö. and Harjes H.-P., 1998: Source parameters of injection-induced microearthquakes at 9 km depth at the KTB deep drilling site, Germany. Bull. Seism. Soc. Am., 88,3, 815–832.
Journal of Geological Sciences, 1997, vol. 47-special issue: Geological model of Western Bohemia related to the KTB borehole in Germany, eds. S. Vrána and V. Štědrá.
Kämpf H., Seifert W. and Dulski P., 1998: Mantle and crustal xenoliths from the Quaternary volcano Železná Hůrka, Western Eger Rift. In Magma and rift basin evolution — Excursion guide, Abstracts, Czech Rep., Liblice, Sept. 7–11, 1998. Czech Geol. Survey, Prague, p. 74.
Kárník V., Michal E. and Molnár A., 1957: Erdbebenkatalog der Tschechoslowakei bis zum Jahre 1956. Travaux géophysiques, No. 69, 411–598.
Kárník V., Procházková D. and Brouček I., 1981: Catalogue of earthquakes for the territory of Czechoslovakia for the period 1957–1980. Travaux géophysiques XXIX, No. 555, 155–186.
Klír S. and Zeman J., 1993: Prognosis study of potential sources of thermal waters in the Cheb basin. Internal report, Artezia Ltd., Prague (in Czech).
Kopecký L., 1966: Tertiary volcanics. In Regional Geology of Czechoslovakia, Part I — The Bohemian Massif (ed. J. Svoboda), Geol. Survey of Czechoslovakia, Prague, 554–580.
Kopecký L., 1978: Neoidic taphrogenic evolution and young alkaline volcanism of the Bohemian Massif. J. Geol. Sci., Prague, 31, 91–107.
Marty B., O'Nions R. K., Oxburgh E. R., Martel D. and Lombardi S., 1992: Helium isotopes in Alpine regions. Tectonophysics, 206, 71–78.
Matthews A., Fouillac C., Hill R., O'Nions R. K. and Oxburgh E. R., 1987: Mantle-derived volatiles in continental crust: the Massif Central of France. Earth Planet. Sci. Letters, 85, 117–128.
Mayer G., Mai P. M., Plenefisch T., Echtler H., Lüschen E., Wehrle V., Müller B., Bonjer K.-P., Prodehl C. and Fuchs K., 1997: The deep crust of the Southern Rhine Graben: reflectivity and seismicity as images of geodynamic processes. Tectonophysics, 275, 15–40.
Mogi K., 1963: Some discussions on aftershocks, foreshocks and earthquake swarms — the fracture of a semi-infinite body caused by an inner stress origin and its relation to the earthquake phenomena. Bull. Earthquake Res. Inst., 41, 615–658.
Neunhöfer H. and Gueth D., 1989: Detailed investigation of the great earthquake swarm in Western Bohemia by the local Vogtland nework. In Monitoring and analysis of the earthquake swarm 1985/86 in the region Vogtland/Western Bohemia (ed. P. Bormann), Potsdam, pp. 124–164.
Nicolas M., Santoire J. P. and Delpech P. Y., 1990: Intraplate seismicity: new seismotectonic data in Western Europe. Tectonophysics, 179, 27–53.
Novotný O., 1996: A preliminary seismic model for the region of the West Bohemian earthquake swarms. Studia geoph. et geod., 40, 353–366.
O'Nions R. K. and Oxburgh E. R., 1988: Helium, volatile fluxes and the development of continental crust. Earth Planet Sci. Letters, 90, 331–347.
O'Nions R. K., Griesshaber E. and Oxburgh E. R., 1989: Rocks that are too hot to handle. Nature, 341, p. 391.
Plenefisch T. and Bonjer K.-P., 1997: The stress field in the Rhine Graben area inferred from earthquake focal mechanism and estimation of frictional parameters. Tectonophysics, 275, 71–97.
Reichle M. and Reid I., 1977: Detailed study of earthquake swarms from the Gulf of California. Bull. Seismol. Soc. Am., 67, 159–171.
Rubin A. M. and Gillard D., 1998: Dike-induced earthquakes: Theoretical considerations. J. Geophys. Res., 103,B5, 10,017–10,030.
Scholz C. H., 1968: The frequency-magnitude relation of microfracturing in rock and its relation to earthquakes. Bull. Seismol. Soc. Am., 58, 399–415.
Skácelová Z., Nehybka V. and Sýkorová Z., 1995: Earthquake swarm Nový Kostel. Exploration Geoph., Remote Sensing and Envir., Brno, II,1, 10–14.
Sobolev S.V., Zeyen H., Granet M., Achauer U., Bauer Ch., Werling F., Altherr R. and Fuchs K., 1997: Upper mantle temperatures and lithosphere-asthenosphere system beneath the French Massif Central constrained by seismic, gravity, petrologic and thermal observations. Tectonophysics, 275, 143–164.
Šflený J. and Pšeněík I., 1995: Mechanisms of local earthquakes in 3-D inhomogeneous media determined by waveform inversion. Geophys. J. Int., 131, 767–769.
Špaček J, 1933: Les tremblements de terre dans la région frontiere Silésie-Moravie. Publications du Bureau Central Séismologique International, sér. B, no. 4, 74–90.
Špičák A., Mrlina J., Jindra D. and Mervart L., 1999: Monitoring of geodynamic activity in the West Bohemia seismoactive region between 1993–1996. J. Geodynamics, 27, 119–132.
Tomek Č., Dvořáková V. and Vrána S., 1997: Geological interpretation of the 9HR and 503M seismic profiles in Western Bohemia. In Geological model of Western Bohemia related to the KTB borehole in Germany, eds. S. Vrána and V. Štědrá, J. Geol. Sci., Prague, 47, 43–50.
Vavryčuk V., 1993: Crustal anisotropy from local observations of shear-wave splitting in West Bohemia, Czech Republic. Bull. Seism. Soc. Am., 83, 1420–1441.
Vavryčuk V., 1995: Reply to comments on „Crustal anisotropy from local observations of shear-wave splitting in West Bohemia, Czech Republic“ by G. H. R. Bokelmann and J. Kawahara: Can the Hudson crack model describe behaviour of real cracks? Bull. Seism. Soc. Am., 85, 661–664.
Wagner G. A., Gögen K., Jonckheere R., Kämpf H., Wagner I. and Woda C., 1998: The age of Quaternary volcanoes Železná Hůrka and Komorní Hůrka (Western Eger Rift), Czech Republic: alpha-recoil track, TL, ESR and fission track chronometry. In Magma and rift basin evolution — Excursion guide, Abstracts, Czech Rep., Liblice, Sept. 7–11, 1998. Czech Geol. Survey, Prague, pp. 95–96.
Weinlich F., Bräuer K., Kämpf H., Strauch G. and Weise, S., 1993: Mantel-Kruste Wechselwirkung im Bereich der Marienbader Störungszone. Teil 2: Gasgeochemische Untersuchungen an Mineralquellen entlang eines Profils über das Eger-Rift. Z. geol. Wiss., 21(1/2), 135–142.
Weinlich F., Tesař J., Weise, S. M., Bräuer K. and Kämpf H., 1998: Gas flux distribution in mineral springs and tectonic structure in the western Eger Rift. J. Czech Geol. Soc., 43,1–2, 91–110.
Wyss M., Shimazaki K. and Wiemer S., 1997: Mapping active magma chambers by b values beneath the off-Ito volcano, Japan. J. Geophys. Res., 102,B9, 20.413–20.422.
Zátopek A. 1956: Seismic characteristics of Czechoslovakia (in Czech). Sborník československé společnosti zeměpisné (Proc. Czech Geograph. Soc.), Prague, LXI,No. 2, 84–85.
Zoback M. D. and Harjes H.-P., 1997: Injection-induced earthquakes and crustal stress at 9 km depth at the KTB deep drilling site, Germany. J. Geophys. Res., 102,B8, 18.477–18.491.
Zollo A., De Matteis R., Capuano P., Ferulano F. and Iannaccone G., 1995: Constraints on the shallow crustal model of the Northern Apennines (Italy) from the analysis of microearthquake seismic records. Geophys. J. Int., 120, 646–662.
About this article
Cite this article
Špičák, A., Horálek, J., Boušková, A. et al. Magma Intrusions and Earthquake Swarm Occurrence in the Western Part of the Bohemian Massif. Studia Geophysica et Geodaetica 43, 87–106 (1999). https://doi.org/10.1023/A:1023366210017
- earthquake swarms
- magma intrusions
- Bohemian Massif
- induced seismicity