Abstract
By analysis of microtremors recorded with digital seismological monitoring equipment near the Provadia salt diapir (Bulgaria), two groups of events showing different characteristics have been detected in the vicinity of the salt production area. The first group of events has low magnitudes and is located at a distance of about 1 km from the top of the salt diapir. These events show low stress drops. The second group of tremors is located outside the salt diapir. The corresponding magnitudes and stress drops are larger. The first class of events seems to be related to processes at the contour of the salt leaching caverns, whereas the origin of the second group seems to be connected with stress redistribution processes around the salt body. Based on this analysis, the tectonic model of the Provadia salt diapir has been modified.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Boncev, E. (1982),Seismotectonic Features of Bulgaria, Geolog. Balcan.12 (2), 71–98.
Boncev, E., Bune, V. I., Christoskov, L., Karagjuleva, J., Kostadinov, V., Reisner, G. J., Rishikova, S., Shebalin, N. V., Sholpo, V. N., andSokerova, A. (1982),A Method for Compilation of Seismic Zoning Prognostic Maps for the Territory of Bulgaria, Geol. Balcan.12 (2), 3–48.
Dobrev, T. B., andSchukin, J. K. (1984),On the Problems of Structure, Geodynamics, and Seismicity of the Lithosphere in the Carpathian-Balkan Region, Geotect., Tectonophys. and Geodyn.,17, 35–59 (in Bulgarian).
Dotzev, N., andYunga, S. (1989),Fault-plane Solutions and Seismotectonic Deformations Study for the Central Balkan Region, Proc. XXI Gen. Assem. ESC, Sofia, 271–277.
Evernden, J. F. (1975),Seismic Intensities of Earthquakes and Related Parameters, Bull. Seismol. Soc. Am.65, 1287–1313.
Georgiev, Tz. (1990),Contemporary Field of the Tectonic Stresses and Dislocation Process in the Region of the Mirovo Salt Body, Bulg. Geophys. J.XVI (4), 63–70 (in Bulgarian).
Glavcheva, R. (1993),Atlas of Isoseismal Maps, Geophys.Inst. BAS, Sofia, 67 pp.
Gocev, P. M., andMatova, M. (1977),The Present Fault Mosaic in Bulgaria and the Seismic Activity, Geotect., Tectonophys. and Geodyn.6, 32–47 (in Bulgarian).
Grosser, H., andHurtig, E. (1980),On the Analysis of the Fracture Process by Seismological Means, Z. geol. Wiss.8, 303–314 (in German).
Hurtig, E., andStiller, H.,Earthquakes and Earthquake Hazard, (Akademie-Verlag, Berlin 1984) 328 pp. (in German).
Knoll, P., Schreiber, B., Kowalle, G., Rother, K., Paskaleva, I., andKouteva, M. (1995),Analysis of Dynamic Stability of a System of Caverns in the Salt Diapir of Provadia/Bulgaria, Proc. 8th Int. Congr. Rock Mechanics, Tokyo, Sept. 25–29 (in press).
Kuhnt, W., Knoll, P., Grosser, H., andBehrens, H.-J. (1989),Seismological models for induced seismic events. InSeismicity in Mines (Gibowicz, S. J. ed.) Pure and Appl. Geophys.129 (3/4), 513–521.
Paskaleva, I., Manev, G., andKouteva, M. (1994),Induced Seismicity at Mirovo Salt Deposit, Bulgaria, unpubl. manuscript.
Rangelov, B. (1994), Personal communication.
Shanov, S. (1990),Tectonic Stress Field in Northwestern Bulgaria, Geolog. Balcan.20 (4), 37–47.
Shanov, S., Georgiev, Tz., andDimitrov, B. (1988),Contemporary Tectonic Stress Field in Northwestern Bulgaria, Rev. Bulg. Geol. Soc.XLIX, part 1, 39–46 (in Bulgarian).
Solakov, D. E., andSimeonova, S. D. (ed.) (1993)Bulgaria-Catalogue of Earthquakes 1981–1990. Geophys. Inst. BAS, Sofia, 39 pp.
Vaptsarov, I., andMishev, K. (1982),Main Features and Dynamics of the Morphostructures in Bulgaria: Significance for Seismic Zoning, Geolog. Balcan.12 (2), 99–116.
Velichkova, S., andSokerova, D. (1980),Analysis of Seismic Events in Bulgaria, Bulg. Geophys. J.VI, 58–72 (in Bulgarian).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Knoll, P., Kowalle, G., Rother, K. et al. Analysis of microtremors within the Provadia region near a salt leaching mine. PAGEOPH 147, 389–407 (1996). https://doi.org/10.1007/BF00877491
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00877491