Identification of a Hidden Volcano in an Open-pit Coal Mine by Gravity Survey, NW Bohemia

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Identification of a Hidden Volcano in an Open-pit Coal Mine by Gravity Survey, NW Bohemia

Popis výsledku v původním jazyce

Volcanic structures often form significant part of sedimentary basins. They represent a serious obstacle to seismic and magnetic surveys, but may become a focus in rift basin description. We encountered a different case ? an assumed volcanic structure inthe forefield of an open-pit brown coal mine. To confirm the presence of such a hidden volcanic body we performed a gravity survey in very challenging topographic and noise conditions at the edge of the mine. Final complete Bouguer anomalies were treated by various filtering techniques including residual separation, horizontal gradients, vertical derivatives, etc. We extracted a positive residual gravity anomaly and delineated its extent from the gradient data. As well, we studied rock samples densities and porosity. It was found that the assumed volcanic rock (trachyandesite) and partly the related breccias exhibit significantly higher density than the surrounding and overlaying Tertiary sediments of the Most Basin.

Název v anglickém jazyce

Identification of a Hidden Volcano in an Open-pit Coal Mine by Gravity Survey, NW Bohemia

Popis výsledku anglicky

Volcanic structures often form significant part of sedimentary basins. They represent a serious obstacle to seismic and magnetic surveys, but may become a focus in rift basin description. We encountered a different case ? an assumed volcanic structure inthe forefield of an open-pit brown coal mine. To confirm the presence of such a hidden volcanic body we performed a gravity survey in very challenging topographic and noise conditions at the edge of the mine. Final complete Bouguer anomalies were treated by various filtering techniques including residual separation, horizontal gradients, vertical derivatives, etc. We extracted a positive residual gravity anomaly and delineated its extent from the gradient data. As well, we studied rock samples densities and porosity. It was found that the assumed volcanic rock (trachyandesite) and partly the related breccias exhibit significantly higher density than the surrounding and overlaying Tertiary sediments of the Most Basin.

Druh

D - Stať ve sborníku

CEP obor

DC - Seismologie, vulkanologie a struktura Země

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 20th European Meeting of Environmental and Engineering Geophysics - Near Surface Geoscience

ISBN

978-94-6282-027-2

ISSN

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e-ISSN

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Počet stran výsledku

5

Strana od-do

"Tu PA2 03/1"-"Tu PA2 03/5"

Název nakladatele

EAGE

Místo vydání

Houten

Místo konání akce

Athens

Datum konání akce

14. 9. 2014

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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