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Journal of Seismology

, Volume 23, Issue 5, pp 995–1016 | Cite as

Tomographic imaging of the NW edge of the Hellenic volcanic arc

  • Andreas KarakonstantisEmail author
  • Panayotis Papadimitriou
  • Christos Millas
  • Ioannis Spingos
  • Ioannis Fountoulakis
  • George Kaviris
Original Article

Abstract

The broader South Aegean area is characterized by the convergence of the African and Eurasian lithospheric tectonic plates at a rate of approximately 30 mm/year, resulting in a complex and intense deformation of the Aegean (McClusky et al. Geophys. Res. 105: 5695–5719, 2000). The Saronikos Gulf, situated in the NW termination of the Hellenic volcanic arc (Central Aegean Sea), is an area of special geophysical interest due to the variety of the recorded seismicity, regarding both the origin (tectonic, volcanic) and the focal depths. The presence of Plio-Quaternary volcanic centers and the complex seismicity distribution urge the need of detailed research on the geophysical properties such as seismic velocities, revealing possible presence of magmatic bodies or geothermal fluids. In the present study, more than 3000 manually revised events were located using a local 1-D layered velocity model. The main spatiotemporal clusters are concentrated along the Leuces and Methana-Poros E-W striking neotectonic fault zones. A local earthquake tomography (LET) was performed, using body-wave (P and S) travel time data, to investigate small to medium scale (~ 10 km) anomalies that can be related to local neotectonic or volcanic patterns. Major shallow ~ E-W to NW-SE trending discontinuities between positive (to the north) and negative (to the south) VP perturbations, anticorrelated to the respective VS image, are identified south of Aigina Island. These results are mainly related to the principal local stress orientation and fault zones (~ E-W to NW-SE strike), such as the Moni, Anghistri, and Leuces, whereas the respective Vp/Vs ratio values imply the presence of possible magmatic features which can be linked to the Plio-Quaternary NW edge of the Hellenic volcanic arc and hydrothermal activity ENE of Poros Island.

Keywords

Local earthquake tomography Local velocity model Magmatic intrusions Volcanic arc Saronikos, Greece 

Notes

Acknowledgments

We acknowledge support of this study by the project “HELPOS - Hellenic Plate Observing System” (MIS 5002697) which is implemented under the Action “Reinforcement of the Research and Innovation Infrastructure”, funded by the Operational Programme “Competitiveness, Entrepreneurship and Innovation” (NSRF 2014-2020) and co-financed by Greece and the European Union (European Regional Development Fund). We would like to thank Dr. Ivan Koulakov for providing the LOTOS code and his useful advice on our work, Ms. Kyriaki Drymoni, Ph.D. candidate in Royal Holloway, University of London, for her useful advice in matters concerning active magmatic systems, and the two anonymous reviewers for their creative comments and suggestions. Special thanks are dedicated to the scientists, post-graduate students, and personnel who participated in the installation or maintenance of the stations belonging to the HUSN and assisted to the signal processing and manual location of the recorded seismicity. The figures are produced using ArcGIS and Surfer, Golden Software and GMT (Wessel and Smith 1995).

Supplementary material

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© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Section of Geophysics – GeothermicsNational and Kapodistrian University of AthensZografouGreece

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