Results of the magnetotelluric investigations at geophysical observatories in Bulgaria

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Results of the magnetotelluric investigations at geophysical observatories in Bulgaria

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Results of the magnetotelluric investigations at geophysical observatories in Bulgaria

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Geophysical Journal International

ISSN

0956-540X

e-ISSN

—

Svazek periodika

215

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

16

Strana od-do

165-180

Kód UT WoS článku

000448242600011

EID výsledku v databázi Scopus

2-s2.0-85056586646