Results of the magnetotelluric investigations at geophysical observatories in Bulgaria

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F18%3A00494313" target="_blank" >RIV/67985530:_____/18:00494313 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1093/gji/ggy268" target="_blank" >http://dx.doi.org/10.1093/gji/ggy268</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/gji/ggy268" target="_blank" >10.1093/gji/ggy268</a>

Result language

angličtina

Original language name

Results of the magnetotelluric investigations at geophysical observatories in Bulgaria

Original language description

We present results of the geoelectric studies in Bulgaria, carried out with the GEOMAG-02 equipment at the geophysical observatories of the Bulgarian Academy of Sciences. Compared with previous long-period electromagnetic investigations carried out with an analogue device by Russian and Bulgarian geophysicists in the 1980s the application of modern equipment and processing methods makes it possible to obtain interpretive options for the periods from a few seconds up to 3 hr and study the geoelectric structure at shallower depths. The recorded data together with the previous long-period data were analysed and the 1-D, 2-D and quasi-3-D inversion have been employed to model the conductivity distribution within the Earth's crust of Bulgaria. Some of the revealed conductivity anomalies seem to spatially coincide with the regional fault zones-Maritsa and Sub-Balkan. Joint interpretation of the 2-D and quasi-3-D inversion results suggests the relation of one of these conductivity anomalies near the PLN observatory to the Maritsa fault zone. The association of some of revealed conductivity anomalies with the fluid transport processes is supported by the fracture-type hydrothermal reservoirs widespread in the studied area south of the Sub-Balkan fault ( and especially south of theMaritsa fault) and by the audiomagnetotelluric case study in the Bourgas geothermal basin in the eastern part of Bulgaria. A comparison of the distribution of conductivity anomalies, determined from the quasi-3-D inversion, and seismicity shows that most of the earthquakes occur outside the high conductivity areas. In seismoactive regions such effect may indicate possible association with metamorphic processes in the crust with the participation of fluids within the fractured media.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10508 - Physical geography

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geophysical Journal International

ISSN

0956-540X

e-ISSN

—

Volume of the periodical

215

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

16

Pages from-to

165-180

UT code for WoS article

000448242600011

EID of the result in the Scopus database

2-s2.0-85056586646