Published November 27, 2024 | Version v1
Journal article Open

NEW APPROACHES IN THE SESISMOTECTONICS OF THE MARGINAL DACIDES UNIT

Creators

  • 1. National Institute for Earth Physics
  • 2. University of Bucharest, Doctoral School of Geology
  • 3. University of Bucharest, Faculty of Geology and Geophysics
  • 4. Academy of Romanian Scientists
  • 5. ROR icon Romanian Academy
  • 6. University of Bucharest, Faculty of Physics

Description

The goal of this study is to perform a cross-correlation analysis of the earthquake sequences, recorded between 2014 and 2016 in the Caransebeș Mehadia Area (CMA), in Romania, and to correlate the results with the surface geology, for a better understanding of the neotectonics processes taking place in the South-Western Carpathian Bend Zone.  The apparent sparse seismicity between 1886 and 2005 in CMA is mostly due to the lack of seismic stations in the region before 2006. The image changed with 2006, when the recorded event rate increased to 3-15 events/year between 2006-2013 and 2017-2023 and to 45-70 events/year between 2014–2016-time intervals. The high number of events recorded between 2014 and 2016 is related to the occurrence of the three seismic sequences in the CMA: between 31/10/2014 and 20/02/2015, between 23/11/2015 and 28/12/2015 and between 27/07/2016 and 29/08/016. We apply the cross correlation analysis technique for the events recorded in the 2014-2016 time period to identify events belonging to a cluster and to identify new events undetected by routine seismic analysis. The templates used for the analysis were selected from the events recorded in ROMPLUS. We consider an event as belonging to a cluster if the cross-correlation coefficient is equal to or greater than 0.7. Four templates were used and the results show a detection of 37 new events belonging to the seismic sequences from CMA. The distribution of the epicentres shows a migration from west to east suggesting a possible post-triggering effect after the 2014 mainshock.

Files

265-053-066-New approaches in the seismotectonics of the marginal Dacides Unit.pdf

Files (5.0 MB)

Additional details

References

  • Berza, T, Drăgănescu, A. (1988). The Cerna-Jiu fault system (South Carpathians, Romania), a major Tertiary transcurrent lineament". D.S. Inst. Geol. Geofiz., 72-73: 43-57, București.
  • Linzer, H.G., Frisch, W., Zweigel, P., Gîrbacea, R., Hann, H.P., Moser, F. (1998). Kinematic evolution of the Romanian Carpathians. Tectonoph., 297(1-4): 133-156, ISSN 0040-1951, https://doi.org/10.1016/ S0040-1951(98)00166-8
  • Maţenco, L., Bertotti, G., Leever, K., Cloetingh, S., Schmid, S., Tărăpoancă, M., Dinu, C. (2007). Large‐scale deformation in a locked collisional boundary: interplay between subsidence and uplift, intraplate stress, and inherited lithospheric structure in the late stage of the SE Carpathians evolution. Tectonics, 26: 1-29, TC4011, doi:10.1029/2006TC001951
  • Maţenco, L., Radivojevic, D. (2012). On the formation and evolution of the Pannonian Basin: Constraints derived from the structure of the junction area between the Carpathians and Dinarides. Tectonics, 31 (6): 1-31, TC6007, doi:10.1029/2012TC003206
  • Oncescu, M.,C., Mârza, V.I., Rizescu, M., Popa, M. (1999). The Romanian Earthquake Catalogue Between 1984-1997: 43-47, https://doi. org/10.1007/978-94-011-4748-4_4
  • Oroș, E. (2004). The April-August 2002 Moldova Nouă earthquakes sequence and its seismotectonic significance. Rev. Roum. Geoph., 48: 49-68.
  • Oroș, E. (2007). Macroseismic and instrumental seismicity of the Banat region and its significance on the local seismic hazard and risk. "Thirty years from the Romanian Earthquake of March 4, 1977"; Bucharest, Romania, 1-3 March 2007.
  • Oroș, E. (2011). Cercetări privind hazardul seismic pentru Banat, Ed. Sfântul Nicolae; 393 p. (in Romanian), ISBN: 978-606-30-4261-4.
  • Oroș, E., Diaconescu, M. (2015). Recent Vs. Historical Seismicity Analysis for Banat Seismic Region (Western Part Of Romania). Math. Model. Civ. Eng., 11(1): 1-10, https://doi.org/10.1515/mmce-2015-0001
  • Oroș, E., Popa, M., Moldovan, I.A. (2008). Seismological DataBase for Banat Seismic Region (Romania)-Part 1: The Parametric Earthquake Catalogue. Rom. J. Phys., 53(7-8): 955-964.
  • Placintă, A., Popescu, E., Borleanu, F., Radulian, M., Popa, M. (2016). Analysis of source properties for the earthquake sequences in the South-Western Carpathians (Romania). Rom. Rep. Phys., 68(3): 1240-1258.
  • Popa, M., Chircea, A., Dinescu, R., Neagoe, C., Grecu, B., Borleanu, F. (2022). Romanian Earthquake Catalogue (ROMPLUS) 984-2022, Mendeley Data, V2, doi:10.17632/tdfb4fgghy
  • Popa, M., Munteanu, I., Borleanu, F., Oroș, E., Radulian, M., Dinu, C. (2018). Active tectonic deformation and associated earthquakes: a case study – South West Carpathians Bend Zone. Act. Geod. Geoph., 53: 395-413. https://doi.org/10.1007/s40328-018-0224-1
  • Popescu, E., Radulian, M. (2001). Source characteristics of the seismic sequences in the Eastern Carpathians foredeep region (Romania). Tectonoph., 338(3-4): 325-337.
  • Radulian, M., Popescu, E., Borleanu, F., Diaconescu, M. (2014). Source parameters of the December 2011 - January 2012 earthquake sequence in Southern Carpathians, Romania. Tectonoph., 623: 23-38.
  • Radulian, M., Vaccari, F., Mândrescu, N., Panza, G.F., Moldoveanu, C.L. (2000). Seismic Hazard of Romania: Deterministic Approach. Pure Appl. Geoph., 157: 221-247.
  • Ratschbacher, L., Linzer, H.G., Moser, F., Strusievicz, R.O., Bedelean, H., Har, N., Mogoş, P.A. (1993). Cretaceous to Miocene thrusting and wrenching along the central south Carpathians due to a corner effect during collision and orocline formation. Tectonics, 12(4): 855-873, doi:10.1029/93TC00232
  • Săndulescu, M. (1984). Geotectonica României, Ed. Tehnică, Bucharest (in Romanian).
  • Săndulescu, M. (1988). Cenozoic tectonic history of the Carpathians, in The Pannonian Basin. A Study in Basin Evolution. In: L.H. Royden and F. Horváth (Eds.), AAPG Mem., 45: 17-25.
  • Săndulescu, M., Krautner, H., Borcoș, M., Năstăseanu, S., Patrulius, D., Ştefănescu, M., Ghenea, C., Lupu, M., Savu, H., Bercia, I., Marinescu, F. (1978). Geological map of Romania. In: IGR (Ed.). Geology Atlas, sheet no 1., IGR, Bucharest.
  • Schmid, S., Bernoulli, D., Fügenschuh, B., Maţenco, L., Schefer, S., Schuster, R., Tischler, M., Ustaszewski, K. (2008). The Alpine-Carpathian- Dinaridic orogenic system: correlation and evolution of tectonic units. Swiss J. Geosci., 101: 139-183.
  • Ştefănescu, M. and the working group (1988). Geological cross-section at scale 1:200.000, no. B 1-7. Inst. Geol. Geofiz., Bucharest.
  • Waldhauser, F., Ellsworth, W.L. (2000). A Double-Difference Earthquake Location Algorithm: Method and Application to the Northern Hayward Fault, California. Bull. Seism. Soc. Amer., 90 (6): 1353- 1368.
  • http://www.infp.ro/data/romplus.txt
  • https://earthquake.usgs.gov/