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Search for and investigation of volcanoes with gravity surveys
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SYSNO ASEP 0502952 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Search for and investigation of volcanoes with gravity surveys Author(s) Mrlina, Jan (GFU-E) ORCID, RID Source Title EAGE-HAGI 1st Asia Pacific Meeting on Near Surface Geoscience and Engineering. Proceedings. - Red Hook : Curran, 2018 - ISBN 978-1-5108-6269-2 Pages s. 324-328 Number of pages 5 s. Publication form Print - P Action EAGE-HAGI Asia Pacific Meeting on Near Surface Geoscience and Engineering /1./ Event date 09.04.2018 - 13.04.2018 VEvent location Yogyakarta Country ID - Indonesia Event type WRD Language eng - English Country US - United States Keywords gravity survey ; volcano monitoring ; volcanic structure Subject RIV DC - Siesmology, Volcanology, Earth Structure OECD category Volcanology R&D Projects LM2010008 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015079 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support GFU-E - RVO:67985530 Annotation Geophysical methods, mainly gravimetry and magnetometry, can serve as suitable tools for location of unknown hidden volcanic structures that are not expressed by any typical topographic features. These may be e.g. diatremes and maars with eroded scoria cones or rims of tuff/tephra material, as well as lava flows. Gravity survey may reveal significant negative anomalies due to low density of the filling of volcanic vents, or positive anomalies over the bodies of compact lava accumulation. Magnetometry would rather show positive anomalies related to most of the volcanic structures due to high content of magnetic minerals in the volcanic rocks (except acid trachytes/phonolites/rhyolites). Geophysical surveys should therefore form part of any investigation of volcanic fields where some unknown volcanoes may still be expected. Gravity monitoring can reveal hidden mass and fluids movement in a volcano interior, and can therefore contribute to the hazard control at regions with active volcanoes. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2019
Number of the records: 1