A comment on “On earthquake depths in the
Crimean-Black Sea Region”
by V.E. Kulchitsky, B.G. Pustovitenko and V.A. Svidlova
V.Yu.
Burmin1, L.A. Shumlyanskaya2
1Schmidt Institute of Physics of the Earth, Russian
Academy of Sciences, Moscow, Russia
2Institute of Geophysics, National Academy of Sciences
of Ukraine, Kiev, Ukraine
Corresponding
author:
Valery Yu. Burmin, e-mail: burmin@ifz.ru
Abstract. It is well known that the results of determining the earthquake parameters
depend to a large extent on data processing algorithms and seismic wave
velocity used in solving hypocenter problems. In 1992, Burmin
developed a hypocentric algorithm based on minimizing
the distance functional between the points corresponding to the theoretical and
observed travel time of the seismic wave from the earthquake source to the
recording stations. The determination of the coordinates of earthquake
hypocenters in this case is much more stable than with the usual minimization
of the residual time functional of the arrival of seismic waves at the station.
With this algorithm and the refined velocity model of the medium, V.Yu. Burmin together with
L.A. Shumlyanskaya reinterpreted the earthquake
parameters in the Crimean-Black Sea region. The most important result of this
reinterpretation was the conclusion that deep earthquakes with a depth of more
than 60 km occurred in the region. This result contradicts the hardened
ideas about the seismicity of the region and therefore caused serious criticism
from experts who took an direct participation in the
compilation of the existing catalogs of earthquakes in the region. These
remarks and criticism are presented in the article by V.E. Kulchitsky with co-authors, published in this issue of the
journal. In our article, a detailed analysis of the comments made and answers
to them are provided. In particular, it was shown that the previously used
methods of seismic data processing by default excluded the possibility of the
appearance of deep earthquakes in the results. As an example, we refer to the
use of travel time curves for depths of up to 35 km. It is quite obvious
that with this approach, deep earthquakes could not be revealed.
Keywords:
hypocenter, algorithm, deep earthquakes, Crimea, Black Sea.
About the authors
BURMIN Valery Yurievich — Dr. of Ph. & Math, chief research scientist, Schmidt Institute of
Physics of the Earth, Russian Academy of Sciences. 123242, Moscow, ul. Bolshaya Gruzinskaya 10, stroenie 1. Tel.: +7 (499) 254-68-95. E-mail:
burmin@ifz.ru
SHUMLYANSKAYA Lyudmila Aleksandrovna — Ph. D. in Geological Sciences, scientific reseacher,
Institute of Geophysics of NAS of Ukraine. Ukraine, 03860, Kiev, Palladina
Avenue 32. Tel.: +3 (8093) 146-50-12. E-mail: lashum@ukr.net
Cite this article as: Burmin V.Yu., Shumlyanskaya L.A. A comment on “On earthquake depths in the
Crimean-Black Sea Region” by V.E. Kulchitsky,
B.G. Pustovitenko and V.A. Svidlova, Voprosy Inzhenernoi Seismologii (Problems
of Engineering Seismology). 2017. Vol. 44, No. 3, pp. 103–112. DOI:
10.21455/VIS2017.3-7 [in Russian].
English translation of the article will be published
in Seismic Instruments, ISSN: 0747-9239
(Print) 1934-7871 (Online), https://link.springer.com/journal/11990), 2018,
Volume 54, Issue 3.