Abstract
The seismic activity of the volcanic field of Kos-Yali-Nisyros, south-eastern part of the South Aegean Volcanic Arc, was observed by an “amphibious” seismic network consisting of nine 3C stand-alone land stations and four 4C ocean bottom seismographs. The array operated for a period of four months, from June 28 to October 13, 2001. Accuracy location of the seismic foci was optimized by using a 1D local velocity model obtained by active seismic observations. 1190 micro-earthquakes over a threshold magnitude of 0.7 ML were identified, using arrivals recorded by a minimum of four stations per event. The average RMS of the travel time residuals was better than 0.1 s for events located within the array and 0.2 s for those lying outside. Regional seismicity and focal mechanisms of larger events in the fault system Gökova, Kos-Nisyros and that of Karpathos basins delineate the extensional boundary to the north and west of the Dodecanese islands block. This block unit, although internally strongly fractured, is decoupled from the Aegean microplate . It is anticlockwise rotated with the west Karpathos basin that limits its western flank—having the largest width and maximum subsidence. These processes are very young having their maximum intensity at the bend of the fault system from E-ENE direction to nearly N-S striking. The magmatic intrusions are concentrated in this area of bending. They are driven by the subduction of the Ionian oceanic lithosphere below the Aegean microplate with deep seismic foci of 150 to 180 km depth building a cluster below the Nisyros and Kos islands. The mapped seismicity is mainly induced by the volcanic processes of magma intrusion within 4 km below Nisyros and apophytic branches of magma below Yali and Strongyli islands. The main magma chamber is below 6 km depth and the induced pressure in the upper crust, due to magma injection, generates fractures and hydrothermal circulation followed by high local seismicity of small magnitude events.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Allen SR (2001) Reconstruction of a major caldera-forming eruption from pyroclastic deposit characteristics: Kos Plateau Tuff eastern Aegean sea. J Volcanol Geotherm Res 105:141–162
Allen SR, Cas RAF (2001) Transport of pyroclastic flows across the sea during the explosive, rhyolitic eruption of the Kos Plateau Tuff, Greece. Bull Volcanol 62:441–456
Allen SR, Stadlbauer E, Keller J (1999) Stratigraphy of the kos plateau tuff: product of a major quaternary explosive rhyolitic eruption in the eastern Aegean sea. Int J Earth Sci 88:132–156
Bohnhoff M, Rische M, Meier T, Endrun B, Becker D, Stavrakakis G, Harjes H-P (2004) CYC-NET: a temporary seismic network on the Cyclades (Aegean Sea, Greece). Seism Res Lett 75(3):352–359
Bohnhoff M, Harjes HP, Meier T (2005) Deformation and stress regimes at the Hellenic subduction zone from focal mechanisms. J Seismolog 9(3):341–366
Bohnhoff M, Rische M, Meier T, Becker D, Stavrakakis G, Harjes H-P (2006) Microseismic activity in the Hellenic Volcanic Arc, Greece, with emphasis on the seismotectonic setting of the Santorini-Amorgos zone. Tectonophysics 423:17–33
Brüstle A (2012) Seismicity of the eastern Hellenic Subduction Zone. Ph.D. thesis. Ruhr University, Bochum, p 151
Crosson R (1972) Small earthquakes, structure and tectonics of the Puget sound region. Bull Seismol Soc Am 62:1133–1171
Davis EN (1967) Zur Geologie und Petrologie des Inseln Nisyros und Jali (Dodecanese). Prakt Akad Athens 42:235–252
Friedrich W, Brüstle A, Küperkoch L, Lamara S, Egelados Working Group (2014) Focal mechanisms in the southern Aegean from temporary seismic networks—implications for the regional stress field and ongoing deformation processes. Solid Earth 5:275–297
Galanopoulos A (1960) A catalogue of shocks with Io > VI for the years 1801–1958. Publ Nat Obs Athens Seismol Inst 119
Jackson J (1994) Active tectonics of the Aegean region. Ann Rev Earth Planet Sci 22:239–271
Jackson J, McKenzie D (1988) Rates of active deformation in Aegean sea and surrounding regions. Basin Res 1:121–128
Keller J, Rehren TH, Stadlbauer E (1990) Explosive volcanism in the Hellenic arc. A summary and review. In: Proceedings of the third scientific congress Thera and the Aegean World III, Earth Sci 2:13–26
Klein F (1989) User’s Guide to HYPOINVERSE, a program for VAX computers to solve for earthquake locations and magnitudes, U.S. Geol. Surv. Open-File Rep, 89–314
LePichon X, Angelier J (1979) The Hellenic arc and trench system: a key to the neotectonic evoloution of the eastern Mediterranean area. Tectonophysics 60:1–42
Makris J, Moeller A (1990) An ocean bottom seismograph for general use. Technical requirements and applications. In: Hoefeld, J, Mitzlaff A, Polomsky S (eds) Proceedings of symposium “Europe and the sea”. Hamburg
Makris J, Papoulia J, Groumpa M, Fasoulaka C (2016) Crustal thickness and physical properties of the Dodecanese area, south eastern Aegean volcanic arc (this volume)
Makropoulos C, Burton P-W (1981) A catalogue of the seismicity in Greece and adjacent areas. Geophys J R Astr Soc 65:741–762
Marini L, Principe C, Chiodini G, Cioni R, Fytikas M, Marinelli G (1993) Hydrothermal eruptions of Nisyros (Dodecanese, Greece). Past events and present hazard. J Volcanol Geotherm Res 56:71–95
McKenzie D (1972) Active tectonics in the Mediterranean region. Geophys J Roy Astron Soc 30:109–185
Nomikou P (2004) Geodynamic of Dodecanese islands: Kos and Nisyros volcanic field. Ph.D. thesis. Department of Geology, University of Athens, p 469
Nomikou P, Papanikolaou D (2000) Active geodynamics at Nisyros, the eastern edge of the Aegean volcanic arc: emphasis on the submarine survey. In: Proceedings of the 3rd international conference on the geology of the eastern mediterranean, pp 97–103
Papanikolaou D (1993) Geotectonic evolution of the Aegean. Bull Geol Soc Greece 27:33–48
Papanikolaou D, Nomikou P (2001a) Tectonic structure and volcanic centres at the eastern edge of the Aegean volcanic arc around Nisyros Island. Bull Geol Soc Greece 34(1):289–296
Papanikolaou D, Nomikou P (2001b) Tectonic structure and volcanic centres at the eastern edge of the Aegean volcanic arc around Nisyros Island. In: Proceedings of the 9th international congress, Athens, Sept 2001, Bull Geol Soc Greece XXXIV:1289–1296
Papazachos B, Papazachou C (1997) Earthquakes in Greece. Editions Ziti, Thessaloniki
Smith PE, York D, Chen Y, Evensen N-M (1996) Single crystal 40Ar–39Ar dating of a late quaternary paroxysm on Kos, Greece: concordance of terrestrial and marine ages. Geophys Res Lett 23:3047–3050
Tür H, Yaltirak C, Elitez I, Sarikavak K-T (2014) Pliocene-quaternary tectonic evolution of the Gulf of Gökova, southwest Turkey. Tectonophysics 638:158–176
Varnavas SP, Cronan D-S (1991) Hydrothermal metallogenic processes off the islands of Nisyros and Kos in the Hellenic Volcanic Arc. Mar Geol 99:109–133
Varnavas SP, Panagiotaras D, Megalovasilis P-S (1998) Chemical characteristics of a submarine hydrothermal system offshore Kos Island, on the Hellenic Volcanic Arc. Rapp Comm Int Mer Medit 35:104–105
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer International Publishing AG
About this chapter
Cite this chapter
Papoulia, J., Makris, J., Koulakov, I., Fasoulaka, C., Drakopoulou, P. (2018). Microseismicity and Crustal Deformation of the Dodecanese Volcanic Area, Southeastern Aegean Sea Using an Onshore/Offshore Seismic Array. In: Dietrich, V., Lagios, E. (eds) Nisyros Volcano. Active Volcanoes of the World. Springer, Cham. https://doi.org/10.1007/978-3-319-55460-0_9
Download citation
DOI: https://doi.org/10.1007/978-3-319-55460-0_9
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-55458-7
Online ISBN: 978-3-319-55460-0
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)