Comparison of lake and land tephra records from the 2015 eruption of Calbuco volcano, Chile.
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| Title: | Comparison of lake and land tephra records from the 2015 eruption of Calbuco volcano, Chile. |
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| Authors: | McNamara, Keri1 keri.mcnamara@bristol.ac.uk, Rust, Alison C.1, Cashman, Katharine V.1, Castruccio, Angelo2,3, Abarzúa, Ana M.4 |
| Source: | Bulletin of Volcanology. Feb2019, Vol. 81 Issue 2, p1-1. 1p. |
| Subject Terms: | *Volcanic ash, tuff, etc., *Volcanoes, *Volcanic eruptions, *Lake sediments, *Isochronous cyclotrons |
| Geographic Terms: | Chile |
| Abstract: | Tephra layers in lake sediment cores are regularly used for tephrostratigraphy as isochronous features for dating and recording eruption frequencies. However, their value for determining volcanic eruption size and style may be complicated by processes occurring in the lake that modify the thickness and grain size distributions of the deposit. To assess the reliability of data from lake cores, we compare tephra deposited on land during the 2015 eruption of Calbuco volcano in Chile to records in sediment cores from three lakes of different sizes that are known to have received primary fall deposits. In general, the thickness and granulometry of the deposit in lake cores and nearby terrestrial sections are very similar. As anticipated, however, cores sampled close to (here, within 300 m of) fluvial inflows were affected by sediment deposition from the lake's catchment; they differed from primary deposits not only in their greater thickness and organic content but also in poor sorting and lack of grading. Cores 850 m away from the inlet were not affected. We consider our results in the context of the particle settling regime as well as each lake's location, bathymetry and catchment area. We find that the particle settling regime is important in more distal settings where the ash particles are small and particle settling occurs in density plumes rather than as individual particles. We conclude that lake cores can be useful for physical volcanology providing consideration is given to eruption parameters such as particle size and mass flux, as well as lake features such as bathymetry and catchment area. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 135025071 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Comparison of lake and land tephra records from the 2015 eruption of Calbuco volcano, Chile. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22McNamara%2C+Keri%22">McNamara, Keri</searchLink><relatesTo>1</relatesTo><i> keri.mcnamara@bristol.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Rust%2C+Alison+C%2E%22">Rust, Alison C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Cashman%2C+Katharine+V%2E%22">Cashman, Katharine V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Castruccio%2C+Angelo%22">Castruccio, Angelo</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Abarzúa%2C+Ana+M%2E%22">Abarzúa, Ana M.</searchLink><relatesTo>4</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Bulletin+of+Volcanology%22">Bulletin of Volcanology</searchLink>. Feb2019, Vol. 81 Issue 2, p1-1. 1p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Volcanic+ash%2C+tuff%2C+etc%2E%22">Volcanic ash, tuff, etc.</searchLink><br />*<searchLink fieldCode="DE" term="%22Volcanoes%22">Volcanoes</searchLink><br />*<searchLink fieldCode="DE" term="%22Volcanic+eruptions%22">Volcanic eruptions</searchLink><br />*<searchLink fieldCode="DE" term="%22Lake+sediments%22">Lake sediments</searchLink><br />*<searchLink fieldCode="DE" term="%22Isochronous+cyclotrons%22">Isochronous cyclotrons</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Chile%22">Chile</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Tephra layers in lake sediment cores are regularly used for tephrostratigraphy as isochronous features for dating and recording eruption frequencies. However, their value for determining volcanic eruption size and style may be complicated by processes occurring in the lake that modify the thickness and grain size distributions of the deposit. To assess the reliability of data from lake cores, we compare tephra deposited on land during the 2015 eruption of Calbuco volcano in Chile to records in sediment cores from three lakes of different sizes that are known to have received primary fall deposits. In general, the thickness and granulometry of the deposit in lake cores and nearby terrestrial sections are very similar. As anticipated, however, cores sampled close to (here, within 300 m of) fluvial inflows were affected by sediment deposition from the lake's catchment; they differed from primary deposits not only in their greater thickness and organic content but also in poor sorting and lack of grading. Cores 850 m away from the inlet were not affected. We consider our results in the context of the particle settling regime as well as each lake's location, bathymetry and catchment area. We find that the particle settling regime is important in more distal settings where the ash particles are small and particle settling occurs in density plumes rather than as individual particles. We conclude that lake cores can be useful for physical volcanology providing consideration is given to eruption parameters such as particle size and mass flux, as well as lake features such as bathymetry and catchment area. [ABSTRACT FROM AUTHOR] |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=135025071 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00445-019-1270-4 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: 1 Subjects: – SubjectFull: Volcanic ash, tuff, etc. Type: general – SubjectFull: Volcanoes Type: general – SubjectFull: Volcanic eruptions Type: general – SubjectFull: Lake sediments Type: general – SubjectFull: Isochronous cyclotrons Type: general – SubjectFull: Chile Type: general Titles: – TitleFull: Comparison of lake and land tephra records from the 2015 eruption of Calbuco volcano, Chile. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: McNamara, Keri – PersonEntity: Name: NameFull: Rust, Alison C. – PersonEntity: Name: NameFull: Cashman, Katharine V. – PersonEntity: Name: NameFull: Castruccio, Angelo – PersonEntity: Name: NameFull: Abarzúa, Ana M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2019 Type: published Y: 2019 Identifiers: – Type: issn-print Value: 02588900 Numbering: – Type: volume Value: 81 – Type: issue Value: 2 Titles: – TitleFull: Bulletin of Volcanology Type: main |
| ResultId | 1 |
