Differential and source terms locations of the 2015 Teresva (East Carpathians) series and their tectonic implications

• Autorzy: Gnyp Andriy , Malytskyy Dmytro

Identyfikatory

DOI

10.1007/s11600-021-00655-w

• Języki publikacji: EN

Abstrakty

EN

Earthquakes of the 2015 Teresva series have been relocated using differential arrivals only of their P-waves at the same set of seismic stations and source-specific station terms. At least six distinct groups had been identified in the series as a result of single linkage clustering analysis of cross-correlations between their waveforms. Differential arrivals were estimated separately in each group, and not directly relative to the master event, but through the chains of events with the largest cross correlations. Time drift at some Ukrainian stations had been detected by comparing intervals between the first P-waves from the same earthquakes at pairs of stations and taken into account, assuming a linear drift rate. The relocated epicenter of the main MSH3.5 earthquake was only~2.3 km to the east of the macroseismic one and almost exactly at the intersection of the two major local faults, perpendicular and parallel to the Carpathians arc. The almost linear alignment of the other earthquakes in azimuth~320° almost coincided with the parallel fault and with the nodal plane of the almost purely strike-slip focal mechanism estimated for the strongest earthquake from its first polarities at 26 stations, and by moment tensor inversion of the ground displacement amplitudes and duration of the first P-wave pulses at 18 stations. A very interesting oscillatory (cyclic) pattern of the epicenter migration along the SE–NW axis, obtained as a result of relocation, was also confirmed by variations in S-relative to P-wave delays: During the cycle, the epicenters gradually shifted to NW and at the beginning of the new cycle returned.

Słowa kluczowe

EN

small earthquake; differential locations; focal mechanism; tectonics; station terms

PL

małe trzęsienie ziemi; zróżnicowane lokalizacje; mechanizm ogniskowy; tektonika

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2021
• Tom: Vol. 69, no. 6
• Strony: 2099--2112
• Opis fizyczny: Bibliogr. 28 poz.

Twórcy

autor

Gnyp Andriy

• Carpathian Branch of Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Lviv, Ukraine

• https://orcid.org/0000-0002-2612-4234

autor

Malytskyy Dmytro

• Carpathian Branch of Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, Lviv, Ukraine

Bibliografia

• 1. Aranovich ZI, Tokmakov VA, Trapeznikov NL (1996) Wide-band medium-period velocimeters based on seismometer CM3-KB with feedback. Seismic Instruments 25–26, Moscow: 111–118 (in Russian)
• 2. Bada G, Horváth F, Dövényi P, Szafián P, Windhoffer G, Cloetingh S (2007) Present-day stress field and tectonic inversion in the pannonian basin. Glob Planet Change 58:165–180
• 3. Borleanu F, Popa M, Radulian M, Oros E (2016) Source parameters of 2015 earthquake sequence occurred at the northwestern Romanian border. EGU General Assembly. EPSC2016–17335
• 4. Efron B (1982) The jackknife, the bootstrap, and other resampling plans, SIAM
• 5. Gnyp A (2010) Refining locations of the 2005–2006 recurrent earthquakes in Mukacheve, West Ukraine, and implications for their source mechanism and the local tectonics. Acta Geophys 58(4):587–603. https://doi.org/10.2478/s11600-010-0006-9
• 6. Gnyp A (2017) Relocation of the 2015 Tyachiv earthquakes using differential arrivals of P-waves. In: Proceedings of the conference “Seismological studies in seismically active regions”, 1–2 June 2017, Lviv, Ukraine, pp 20–23 (in Ukrainian)
• 7. Heidbach O, Custodio S, Kingdon A, Mariucci MT, Montone P, Müller B, Pierdominici S, Rajabi M, Reinecker J, Reiter K, Tingay M, Williams J, Ziegler M (2016) Stress map of the mediterranean and central Europe 2016. GFZ Data Ser. https://doi.org/10.5880/WSM.Europe2016
• 8. Herrmann RB (1979) FASTHYPO - A hypocenter location program. Earthq Notes 50(2):25–38
• 9. International Seismological Centre (2015) On-line Bulletin. https://doi.org/10.31905/D808B830
• 10. Khomenko VI (1971) Deep structure of the Transcarpathian depression. Naukova Dumka, Kyiv (in Ukrainian)
• 11. Khomenko VI (1987) Deep structure of the south-west edge of the East-European platform. Naukova Dumka, Kyiv (in Russian)
• 12. Kováčiková S, Logvinov I, Tarasov V (2019) The relation of the seismicity in the eastern part of the Ukrainian Carpathians and the distribution of electrical conductivity in the Earth’s crust. Geol Carpath 70(6):483–493. https://doi.org/10.2478/geoca-2019-0028
• 13. Kril SY, Bubniak IM, Vikhot YM, Tsikhon SI (2016) Tectonic paleostress fields evolution and calcite veins formation in the southeastern part of the Ukrainian Carpathians during the cenozoic time. Geodynamics 1(20):106–118. https://doi.org/10.23939/jgd2016.01.106
• 14. Kwiatek G, Martínez-Garzón P, Bohnhoff M (2016) HybridMT: a MATLAB/shell environment package for seismic moment tensor inversion and refinement. Seismol Res Lett 87(4):964–976. https://doi.org/10.1785/0220150251
• 15. Malytskyy DV, Obidina OO, Gnyp AR, Pavlova AY, Grytsai OD (2017) Tectonic stresses in the area of Solotvyno deep, Eastern Carpathians, from focal mechanisms of local earthquakes. In: 16th international conference on geoinformatics: theoretical and applied aspects, 15–17 May 2017, Kyiv, Ukraine, Conference Paper 11137_ENG. https://doi.org/10.3997/2214-4609.201701868
• 16. Marchenko AN, Perii SS, Lompas OV, YrI G, Marchenko DA, Kramarenko S, Salawu A (2019) Determination of the horizontal strain rates tensor in Western Ukraine. Geodynamics 2(27):5–15. https://doi.org/10.23939/jgd2019.02.005
• 17. Murovskaya AV, Malytskyy DV, Gnyp AR, Makhnitskyy NR, Mychak SV, Poliachenko IB (2018) Active tectonics and present-day stresses in Transcarpathian trough from mechanisms of local earthquakes. In: Proceedings of the 17th international conference on geoinformatics: theoretical and applied aspects, 14–17 May 2018, Kyiv, Ukraine. Conference Paper №12733_UKR. https://doi.org/10.3997/2214-4609.201801852 (in Russian)
• 18. Nazarevych AV, Nazarevych LY (2013) Geodynamics, tectonics and seismicity of the Carpathian region of Ukraine. Geodynamics 2(15):247–249. https://doi.org/10.23939/jgd2013.02.247 (in Ukrainian)
• 19. Pronyshyn RS (2017) Teresva earthquakes of 2015. Scientific notes of V.I. Vernadsky crimean federal university. Geogr Geol 3(69):139–155
• 20. Sibson R (1973) SLINK: an optimally efficient algorithm for the single-link cluster method. Comput J Br Comput Soc 16(1):30–34. https://doi.org/10.1093/comjnl/16.1.30
• 21. Shearer PM (1997) Improving local earthquake locations using L1 norm and waveform cross correlation: application to the Whittier Narrows, California, aftershock sequence. J Geophys Res 102(B4):8269–8283. https://doi.org/10.1029/96JB03228
• 22. Shearer P, Hauksson E, Lin G (2005) Southern California hypocenter relocation with waveform cross-correlation. Part 2: results using source-specific station terms and cluster analysis. Bull Seism Soc Am 95(3):904–915. https://doi.org/10.1785/0120040168
• 23. Starodub G, Gnyp A (1999) Models of the earth’s crust structure in the East Carpathian region determined from inversion of farfield P-waveforms. Acta Geophys Polon 47(4):375–400
• 24. Tóth L, Mónus P, Zsíros T, Kiszely M (2002) Seismicity in the Pannonian Region: earthquake data. EGU Stephan Mueller Spec Publ Ser 3:9–28
• 25. Verbytskyy ST, Pronyshyn RS, Prokopyshyn VI, Stetskiv AT, Chuba MV, Nischimenko IM, Keleman IN (2016) Seismicity of the Carpathians in 2015. Scientific notes of V.I. Vernadsky crimean federal university. Geogr Geol 2(68):69–219
• 26. Waldhauser F, Ellsworth LW (2000) A double-difference earthquake location algorithm: method and application to the northern hayward fault California. Bull Seism Soc Am 90(6):1353–1368
• 27. WebDC3 Web Interface © (2013–2016) Helmholtz-Zentrum potsdam: deutsches geoforschungszentrum GFZ. https://doi.org/10.5880/GFZ.2.4/2016.001
• 28. Wessel P, Smith WHF (1998) New, improved version of the generic mapping tools released. EOS Trans Am Geophys Un 79(47):579–579