Analysis and automatic detection of lava flows using SAR backscatter applied to the 2017 eruption of Erta 'Ale Volcano, Ethiopia.
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| Title: | Analysis and automatic detection of lava flows using SAR backscatter applied to the 2017 eruption of Erta 'Ale Volcano, Ethiopia. |
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| Authors: | Gosling, Jemima1 (AUTHOR) xn20422@alumni.bristol.ac.uk, Warsame Dualeh, Edna1 (AUTHOR) edna.dualeh@bristol.ac.uk, Biggs, Juliet1 (AUTHOR) juliet.biggs@bristol.ac.uk |
| Source: | Bulletin of Volcanology. Jun2026, Vol. 88 Issue 6, p1-15. 15p. |
| Subject Terms: | *Lava flows, *Remote sensing, *Change-point problems, *Volcanoes, *Volcanic hazard analysis, *Volcanic activity prediction |
| Geographic Terms: | Ethiopia |
| Abstract: | Mapping lava flows from a range of conditions and environments is critical for understanding flow behaviour and hazard assessment, but ground-based observations can be challenging, especially in remote regions. Here, we use 39 SAR backscatter images from the COSMO-SkyMed satellite to measure the extent and surface properties of lava flows from the 2017 to 2019 eruption of Erta 'Ale volcano, Ethiopia. Using pairs of SAR backscatter images, we produce change difference images and map the flow outlines. We observe both increases and decreases in backscatter, which we attribute to differences in surface roughness. These manual-derived flow maps produced detailed outlines that are consistent with results obtained from other datasets, such as coherence. We then apply a sequential analysis technique, CUSUM, to corrected backscatter timeseries and find that it can automatically identify flows with an accuracy of 88%. Automated detection provides an objective and repeatable alternative to manual mapping. We find that at least four pre-eruption acquisitions are required as a baseline to achieve a robust classification. Our results demonstrate that SAR backscatter timeseries analysis can be used to characterise lava flow emplacement and surface evolution in remote volcanic environments. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 194724297 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Analysis and automatic detection of lava flows using SAR backscatter applied to the 2017 eruption of Erta 'Ale Volcano, Ethiopia. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Gosling%2C+Jemima%22">Gosling, Jemima</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> xn20422@alumni.bristol.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Warsame+Dualeh%2C+Edna%22">Warsame Dualeh, Edna</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> edna.dualeh@bristol.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Biggs%2C+Juliet%22">Biggs, Juliet</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> juliet.biggs@bristol.ac.uk</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Bulletin+of+Volcanology%22">Bulletin of Volcanology</searchLink>. Jun2026, Vol. 88 Issue 6, p1-15. 15p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Lava+flows%22">Lava flows</searchLink><br />*<searchLink fieldCode="DE" term="%22Remote+sensing%22">Remote sensing</searchLink><br />*<searchLink fieldCode="DE" term="%22Change-point+problems%22">Change-point problems</searchLink><br />*<searchLink fieldCode="DE" term="%22Volcanoes%22">Volcanoes</searchLink><br />*<searchLink fieldCode="DE" term="%22Volcanic+hazard+analysis%22">Volcanic hazard analysis</searchLink><br />*<searchLink fieldCode="DE" term="%22Volcanic+activity+prediction%22">Volcanic activity prediction</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Ethiopia%22">Ethiopia</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Mapping lava flows from a range of conditions and environments is critical for understanding flow behaviour and hazard assessment, but ground-based observations can be challenging, especially in remote regions. Here, we use 39 SAR backscatter images from the COSMO-SkyMed satellite to measure the extent and surface properties of lava flows from the 2017 to 2019 eruption of Erta 'Ale volcano, Ethiopia. Using pairs of SAR backscatter images, we produce change difference images and map the flow outlines. We observe both increases and decreases in backscatter, which we attribute to differences in surface roughness. These manual-derived flow maps produced detailed outlines that are consistent with results obtained from other datasets, such as coherence. We then apply a sequential analysis technique, CUSUM, to corrected backscatter timeseries and find that it can automatically identify flows with an accuracy of 88%. Automated detection provides an objective and repeatable alternative to manual mapping. We find that at least four pre-eruption acquisitions are required as a baseline to achieve a robust classification. Our results demonstrate that SAR backscatter timeseries analysis can be used to characterise lava flow emplacement and surface evolution in remote volcanic environments. [ABSTRACT FROM AUTHOR] |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=194724297 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00445-026-01984-8 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 1 Subjects: – SubjectFull: Lava flows Type: general – SubjectFull: Remote sensing Type: general – SubjectFull: Change-point problems Type: general – SubjectFull: Volcanoes Type: general – SubjectFull: Volcanic hazard analysis Type: general – SubjectFull: Volcanic activity prediction Type: general – SubjectFull: Ethiopia Type: general Titles: – TitleFull: Analysis and automatic detection of lava flows using SAR backscatter applied to the 2017 eruption of Erta 'Ale Volcano, Ethiopia. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Gosling, Jemima – PersonEntity: Name: NameFull: Warsame Dualeh, Edna – PersonEntity: Name: NameFull: Biggs, Juliet IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 02588900 Numbering: – Type: volume Value: 88 – Type: issue Value: 6 Titles: – TitleFull: Bulletin of Volcanology Type: main |
| ResultId | 1 |
