Verification of the shallow seismic crustal structure of the western Krušné Hory crystalline unit, Czech Republic
Tóm tắt
We analyze refraction measurements along a short profile in western Krušné hory crystalline unit. The profile passed close to the seismically active zone of Nový Kostel. The measurements were carried out to distances of about 15 km using quarry blasts near the village of Horní Rozmyšl, located at the eastern margin of the crystalline unit. Smoothed P-wave travel times were interpreted using the Wiechert-Herglotz method, which yielded a 1-D velocity model of the shallow crustal structure of the crystalline unit down to a depth of 1.7 km. The P-wave velocity of the model increases from about 4.0 km/s at the surface to 5.9 km/s at a depth of 1.7 km. The superficial velocities of our model are somewhat higher than the superficial velocities of the model that is routinely used for earthquake location in the region.
Tài liệu tham khảo
Bankwitz P., Schneider G., Kämpf H. and Bankwitz E., 2003. Structural characteristics of epicentral areas in central Europe: Study case Cheb Basin (Czech Republic). J. Geodyn., 35, 5–32.
DEKORP and Orogenic Processes Working Groups, 1999. Structure of the Saxonian Granulites: Geological and geophysical constrains on the exhumation of high-pressure/high-temperature rocks in the mid-European Variscan belt. Tectonics, 18, 756–773.
Enderle U., Schuster K., Prodehl C., Schultze A. and Briebach J., 1998. The refraction seismic experiment GRANU’95 in the Saxothuringian belt, southeastern Germany. Geophys. J. Inter., 133, 245–259.
Fischer T., Horálek J., Michálek J. and Boušková A., 2010. The 2008 West Bohemia earthqueke swarm in the light of the WEBNET network. J. Seismol., 14, 665–682, DOI: 10.1007/s10950-010-9189-4.
Grad M., 1985. A note on the application of the Wiechert-Herglotz method and modelling in studies of the Earth’s crust by deep seismic sounding. Acta Geophysica Polonica, 33, 259–268.
Grad M., Guterch A., Mazur S., Keller G.R., Špičák A., Hrubcová P., Geissler W.H. and SUDETES 2003 Working Group, 2008. Lithospheric structure of the Bohemian Massif and adjacent Variscan belt in central Europe based on Profile S01 from the SUDETES 2003 experiment. J. Geophys. Res., 113, B10304, DOI: 10.1029/2007JB005497.
Guterch A., Grad M., Keller G.R., Posgay K., Vozár J., Špičák A., Brückl E., Hajnal Z., Thybo H., Selvi O. and CELEBRATION 2000 Working Group, 2003. CELEBRATION 2000 seismic experiment. Stud. Geophys. Geod., 47, 659–669.
Hawman R.B., 2004. Using delay-fired quarry blasts to image the crust: A comparison of methods for deconvolving mixed-delay source wavelets. Bull. Seismol. Soc. Am., 94, 1476–1491, DOI: 10.1785/012003209.
Heuer B., Geissler W.H., Kind R. and Kämpf H., 2006. Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe. Geophys. Res. Lett., 33, L05311, DOI: 10.1029/2005GL025158.
Hrubcová P. and Geissler W.H., 2009. The crust-mantle transition and the Moho beneath the Vogtland/West Bohemian region in the light of different seismic methods. Stud. Geophys. Geod., 53, 275–294.
Janský J., Novotný O., Plicka V., Zahradník J. and Sokos E., 2012. Earthquake location from P-arrival times only: problems and some solutions. Stud. Geophys. Geod., 56, 553–566 DOI: 10.1007/s11200-011-9036-2.
Kolář P. and Boušková A., 2003. On some anomalies of vP/vS ratio of West Bohemian swarm 2000 — preliminary results. Acta Montana IRSM AS CR, Ser. A, No. 22(129), 51–57.
Kolínský P., Málek J. and Brokešová J., 2011. Shear wave crustal velocity model of the Western Bohemian Massif from Love wave phase velocity dispersion. J. Seismol., 15, 81–104, DOI: 10.1007/s10950-010-9209-4.
Málek J., Janský J. and Horálek J., 2000. Layered velocity models of the western Bohemia region. Stud. Geophys. Geod., 44, 475–490.
Málek J., Janský J., Novotný O. and Rössler D., 2004. Vertically inhomogeneous models of the upper crustal structure in the West-Bohemian seismoactive region inferred from the CELEBRATION 2000 refraction data. Stud. Geophys. Geod., 48, 709–730.
Málek J., Horálek J. and Janský J., 2005. One-dimensional qP-wave velocity model of the upper crust for the West Bohemia/Vogtland earthquake swarm region. Stud. Geophys. Geod., 49, 501–524.
Málek J., Novotný O., Gaždová R. and Žanda L., 2010. Anomalous propagation of refracted waves beneath the Orlík water reservoir, Czech Republic. Stud. Geophys. Geod., 54, 389–401.
Martínková M., Pros Z., Klíma K., Lokajíček T. and Kotková J., 2000. Experimentally determined P-wave velocity anisotropy for rocks related to the Western Bohemia seismoactive region. Stud. Geophys. Geod., 44, 581–589.
Mlčoch B., Schulmann K., Šrámek J., Manová M., Pokorný L., Fiala J. and Vejnar Z., 1997. The Saxothuringian Zone. In: S. Vrána and V. Štědrá (Eds.), Geological Model of Western Bohemia Related to the KTB Borehole in Germany. Czech Geological Survey, Prague, Czech Republic, 51–61.
Mlčoch B. and Skácelová Z., 2009. Digital elevation model of the crystalline basement of the Cheb and Sokolov basin areas (Western Bohemia, Central Europe). Z. geol. Wiss., 37(3), 145–152.
Nehybka V. and Skácelová Z., 1997. Seismological study of the Kraslice/Vogtland-Oberfalz region. In: Vrána S. and Štědrá V. (Eds.), Geological Model of Western Bohemia Related to the KTB Borehole in Germany. Czech Geological Survey, Prague, Czech Republic, 186–190.
Novotný M., 1997. The ray interpretation of DSS data from the VI/70 Seismic Transect across the Bohemian Massif. In: Vrána S. and Štědrá V. (Eds.), Geological Model of Western Bohemia Related to the KTB Borehole in Germany. Czech Geological Survey, Prague, 131–139.
Novotný M., 2011. Depth-recursive tomography of the Bohemian Massif at the CEL09 Transect — Part A: Resolution estimates and deblurring aspects. Surv. Geophys., 32, 827–855, DOI: 10.1007/s10712-011-9143-1.
Novotný M., 2012. Depth-recursive tomography of the Bohemian Massif at the CEL09 Transect — Part B: Interpretation. Surv. Geophys., DOI: 10.1007/s10712-011-9155-x.
Novotný M., Skácelová Z., Mrlina J., Mlčoch B. and Růžek B., 2009. Depth-recursive tomography along the Eger Rift using the S01 profile refraction data: tested at the KTB super drilling hole, structural interpretation supported by magnetic, gravity and petrophysical data. Surv. Geophys., 30, 561–600, DOI: 10.1007/s10712-009-9068-0.
Novotný M., Skácelová Z. and Mlčoch B., 2010. Crustal structures beneath the Saxonian Granulite Massif, the České středohoří and the Doupovské hory Mts. based on the depth-recursive tomography. J. Geosci., 55, 187–199, DOI: 10.3190/jgeosci.073.
Novotný O., 1996. A preliminary seismic model for the region of the West-Bohemian earthquake swarms. Stud. Geophys. Geod., 40, 353–366.
Novotný O. and Málek J., 2003. Note on the direct computation of geodetic distances and azimuths on an ellipsoid of revolution. Acta Montana IRSM AS CR, Ser. A, No. 22(129), 75–78.
Novotný O., Janský J., Plicka V. and Lyon-Caen H., 2008. A layered model of the upper crust in the Aigion region of Greece, inferred from arrival times of the 2001 earthquake sequence. Stud. Geophys. Geod., 52, 123–131.
Novotný O., Sokos E. and Plicka V., 2012. Upper crustal structure of the western Corinth Gulf, Greece, inferred from arrival times of the January 2010 earthquake sequence. Stud. Geophys. Geod., 56, 1007–1018, DOI: 10.1007/s11200-011-0482-7.
Plomerová J., Achauer U., Babuška V., Vecsey L. and Bohema W.G., 2007. Upper mantle beneath the Eger Rift (Central Europe): plume or astenospheric upwelling? Geophys. J. Int., 169, 675–682.
Tichelaar B.W. and Ruff L.J., 1989. How good are our best models? Jackknifing, bootstraping, and earthquake depth. Eos Trans. AGU, 70, 605–606.
Thomas P.D., 1965. Geodetic arc lengths on the reference ellipsoid to second-order terms in the flattening. J. Geophys. Res., 70, 3331–3340.
Tomek Č., Dvořáková V. and Vrána S., 1997. Geological interpretation of the 9HR and 503M seismic profiles in western Bohemia. In: Vrána S. and Štědrá V. (Eds.), Geological Model of Western Bohemia Related to the KTB Borehole in Germany. Czech Geological Survey, Prague, 43–50.
Vavryčuk V. and Boušková A., 2008. S-wave splitting from records of local micro-earthquakes in West Bohemia/Vogtland: an indicator of complex anisotropy. Stud. Geophys. Geod., 52, 631–650.
Vrána S. and Štědrá V. (Eds.), 1997. Geological Model of Western Bohemia Related to the KTB Borehole in Germany. Czech Geological Survey, Prague, Czech Republic.
Wilde-Piórko M., Saul J. and Grad M., 2005. Differences in the crustal and uppermost mantle structure of the Bohemian Massif from teleseismic receiver functions. Stud. Geophys. Geod., 49, 85–107.