Tomographic imaging of the NW edge of the Hellenic volcanic arc

Karakonstantis, Andreas; Papadimitriou, P.; Millas, Christos; Spingos, Ioannis; Fountoulakis, Ioannis; Κaviris, George

doi:10.1007/s10950-019-09849-8

Cited by 11 publications

(7 citation statements)

References 88 publications

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“…Additional to the surface seismicity, very deep (80-100 km) sporadic micro events took place on a wider area extending from Methana towards Hydra Island. These deep micro-events may be attributed to the NE-subduction zone of the Ionian oceanic plate that reaches very deep in this area [3,11,17,18]. where there are urban settlements, and also on geological formations which exhibit high coherence, such as volcanoclasts.…”

Section: Resultsmentioning

confidence: 97%

Investigating 2015-2019 deformation patterns at the Methana volcano in Greece using Sentinel-1 MT-InSAR, GNSS/GPS and seismic data

Cigna

Gatsios

Tapete

et al. 2020

Proceedings of the 3rd International Electronic Conference on Geosciences

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Methana is the westernmost dormant volcanic system belonging to the Hellenic volcanic arc in Greece. Its last historic eruption occurred in ∼230 BC, and no alarming signs were observed in recent times. Nevertheless, seismic activity in the Saronic Gulf, geothermal manifestations, and the proximity to densely populated regions (e.g. Athens), provide motivation for a dedicated investigation into present-day deformation patterns. This study exploits Copernicus Sentinel-1 Cband Synthetic Aperture Radar (SAR) images acquired in 2015-2019, processed with a Multi-Temporal Interferometric SAR (MT-InSAR) approach using both persistent and distributed scatterers. Geodetic data from permanent GNSS stations and 2006-2019 GPS benchmark surveying are used as reference to calibrate the MT-InSAR results and validate their accuracy. Combination with geological, seismological and geomorphological data, allows better understanding of the observed ground deformation. The results suggest a complex displacement pattern across the volcano, including local-scale processes, such as settlement in the suburban zones, mass movements and some seasonal fluctuation overlapping with the long-term trend. This geoinformation can feed into the volcano baseline hazard assessment and the monitoring system. Key findings are presented in this short paper, while the full study is published in the journal Applied Sciences.

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Section: Resultsmentioning

confidence: 97%

Investigating 2015-2019 deformation patterns at the Methana volcano in Greece using Sentinel-1 MT-InSAR, GNSS/GPS and seismic data

Cigna

Gatsios

Tapete

et al. 2020

Proceedings of the 3rd International Electronic Conference on Geosciences

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“…All rights reserved. could also represent hydrated rocks in the mantle wedge (Karakonstantis et al, 2019). Thus, we suggest that diapirs connected to the gravitationally instable subduction channel on the retreating slab caused the regularly spaced age-progressive arc magmatism between the Northern Aegean and the SAVA in the past 32 million years (Figure 9).…”

Section: Accepted Articlementioning

confidence: 84%

“…The geochemical variations in the Aegean magmatic rocks suggest that mixing of sediments with peridotite occurred before melting (Figures 6 and 7), implying that the diapirs probably consist of a mélange of the source rocks that rise from the slab surface and melt in the hot shallow mantle (Figure 9) above a constant slab depth of 90–100 km (Halpaap et al., 2018). Seismic profiles close to Methana in the SAVA were interpreted to show a localized ascent of fluids or melts from the slab into the mantle wedge (Halpaap et al., 2018), but the Vp/Vs anomalies could also represent hydrated rocks in the mantle wedge (Karakonstantis et al., 2019). Thus, we suggest that diapirs connected to the gravitationally instable subduction channel on the retreating slab caused the regularly spaced age‐progressive arc magmatism between the northern Aegean and the SAVA in the past 32 million years (Figure 9).…”

Section: Discussionmentioning

confidence: 99%

Migration of Arc Magmatism Above Mantle Wedge Diapirs With Variable Sediment Contribution in the Aegean

Schaarschmidt

Haase

Voudouris

et al. 2021

Geochem Geophys Geosyst

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 Age-progression of magmatic centers reveals the linear migration of Aegean arc magmatism  Subduction of heterogeneous continental lithosphere controls K-rich magma formation  Sediment-rich mélange diapirs trigger arc magmatism at localized magmatic centers Accepted ArticleThis article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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“…Additional to the surface seismicity, very deep (80-100 km) sporadic micro-events took place on a wider area extending from Methana towards Hydra Island. These deep micro-events may be attributed to the NE-subduction zone of the Ionian oceanic plate that reaches very deep in this area [5,54,59,60].…”

Section: Observations From the Seismic Data Analysismentioning

confidence: 95%

“…The optimization of epicentres for the period 2006-2019 was carried out using the HYPOINVERSE software (v.1.4, United States Geological Survey: Menlo Park, CA, USA) [58]. The final quality of the relocated epicentres is very satisfactory due to the use of the one-dimension local velocity model developed by Karakonstantis et al [59]. In particular, the root mean square (RMS) travel-time residual for the whole study period was determined to be 0.46 s, while the means of the horizontal and vertical direction uncertainties for the events' hypocentres are 1.51 km and 5.82 km, respectively.…”

Section: Seismological Data and Processingmentioning

confidence: 99%

Copernicus Sentinel-1 MT-InSAR, GNSS and Seismic Monitoring of Deformation Patterns and Trends at the Methana Volcano, Greece

et al. 2020

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The Methana volcano in Greece belongs to the western part of the Hellenic Volcanic Arc, where the African and Eurasian tectonic plates converge at a rate of approximately 3 cm/year. While volcanic hazard in Methana is considered low, the neotectonic basin constituting the Saronic Gulf area is seismically active and there is evidence of local geothermal activity. Monitoring is therefore crucial to characterize any activity at the volcano that could impact the local population. This study aims to detect surface deformation in the whole Methana peninsula based on a long stack of 99 Sentinel-1 C-band Synthetic Aperture Radar (SAR) images in interferometric wide swath mode acquired in March 2015–August 2019. A Multi-Temporal Interferometric SAR (MT-InSAR) processing approach is exploited using the Interferometric Point Target Analysis (IPTA) method, involving the extraction of a network of targets including both Persistent Scatterers (PS) and Distributed Scatterers (DS) to augment the monitoring capability across the varied land cover of the peninsula. Satellite geodetic data from 2006–2019 Global Positioning System (GPS) benchmark surveying are used to calibrate and validate the MT-InSAR results. Deformation monitoring records from permanent Global Navigation Satellite System (GNSS) stations, two of which were installed within the peninsula in 2004 (METH) and 2019 (MTNA), are also exploited for interpretation of the regional deformation scenario. Geological, topographic, and 2006–2019 seismological data enable better understanding of the ground deformation observed. Line-of-sight displacement velocities of the over 4700 PS and 6200 DS within the peninsula are from −18.1 to +7.5 mm/year. The MT-InSAR data suggest a complex displacement pattern across the volcano edifice, including local-scale land surface processes. In Methana town, ground stability is found on volcanoclasts and limestone for the majority of the urban area footprint while some deformation is observed in the suburban zones. At the Mavri Petra andesitic dome, time series of the exceptionally dense PS/DS network across blocks of agglomerate and cinder reveal seasonal fluctuation (5 mm amplitude) overlapping the long-term stable trend. Given the steepness of the slopes along the eastern flank of the volcano, displacement patterns may indicate mass movements. The GNSS, seismological and MT-InSAR analyses lead to a first account of deformation processes and their temporal evolution over the last years for Methana, thus providing initial information to feed into the volcano baseline hazard assessment and monitoring system.

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Tomographic imaging of the NW edge of the Hellenic volcanic arc

Cited by 11 publications

References 88 publications

Investigating 2015-2019 deformation patterns at the Methana volcano in Greece using Sentinel-1 MT-InSAR, GNSS/GPS and seismic data

Investigating 2015-2019 deformation patterns at the Methana volcano in Greece using Sentinel-1 MT-InSAR, GNSS/GPS and seismic data

Migration of Arc Magmatism Above Mantle Wedge Diapirs With Variable Sediment Contribution in the Aegean

Copernicus Sentinel-1 MT-InSAR, GNSS and Seismic Monitoring of Deformation Patterns and Trends at the Methana Volcano, Greece

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