Normal faults associated with volcanic activity arc
Identifieur interne : 000070 ( Istex/Corpus ); précédent : 000069; suivant : 000071Normal faults associated with volcanic activity arc
Auteurs : B. C. Papazachos ; D. G. PanagiotopoulosSource :
- Tectonophysics [ 0040-1951 ] ; 1993.
English descriptors
- KwdEn :
- Aseismic layer, Benioff zone, Bouguer anomalies, Cluster number, Comninakis, Corresponding rupture zones, Cretan trough, Data sample, Deep rupture zones, Earthquake, Eastern mediterranean, Eastern part, Effective transmission, Epicenter, Epicenter coordinates, Eruption, Extensional crustal deformation, Fault plane solutions, Focal depths, Front part, Fumarole fields, Geomorphological features, Geophys, Geophysical, Geophysical features, Geophysical laboratory, High intensities, Inner part, Intermediate depth, Intermediate depth earthquakes, Intermediate depth shocks, Linear clusters, Lithospheric, Lithospheric slab, Macroseismic intensities, Maximum magnitude, Methana, Nisyros, Normal fault, Normal faults, Outer part, Papazachos, Parallel rupture zones, Present paper, Present study, Quaternary volcanoes, Reliable fault plane solutions, Rupture, Rupture zone, Rupture zones, Santorini, Seismic, Seismic waves, Seismovolcanic cluster, Seismovolcanic clusters, Shallow earthquake, Shallow earthquakes, Shallow shocks, Shallower part, Short period waves, Similar trend, Southern aegean, Spatial distribution, Strong attenuation, Strong earthquakes, Total deformation, Volcanic, Volcanic activity, Volcanic centers, Volcanic eruptions, Western part.
- Teeft :
- Aseismic layer, Benioff zone, Bouguer anomalies, Cluster number, Comninakis, Corresponding rupture zones, Cretan trough, Data sample, Deep rupture zones, Earthquake, Eastern mediterranean, Eastern part, Effective transmission, Epicenter, Epicenter coordinates, Eruption, Extensional crustal deformation, Fault plane solutions, Focal depths, Front part, Fumarole fields, Geomorphological features, Geophys, Geophysical, Geophysical features, Geophysical laboratory, High intensities, Inner part, Intermediate depth, Intermediate depth earthquakes, Intermediate depth shocks, Linear clusters, Lithospheric, Lithospheric slab, Macroseismic intensities, Maximum magnitude, Methana, Nisyros, Normal fault, Normal faults, Outer part, Papazachos, Parallel rupture zones, Present paper, Present study, Quaternary volcanoes, Reliable fault plane solutions, Rupture, Rupture zone, Rupture zones, Santorini, Seismic, Seismic waves, Seismovolcanic cluster, Seismovolcanic clusters, Shallow earthquake, Shallow earthquakes, Shallow shocks, Shallower part, Short period waves, Similar trend, Southern aegean, Spatial distribution, Strong attenuation, Strong earthquakes, Total deformation, Volcanic, Volcanic activity, Volcanic centers, Volcanic eruptions, Western part.
Abstract
Abstract: Volcanic centers (volcanoes, fumaroles or solfatara fields), epicenters of strong shallow earthquakes (with focal depths up to 20 km) and epicenters of intermediate depth strong earthquakes (with focal depths between 120 and 160 km) in the southern Aegean volcanic arc can be grouped into five, well defined, linear clusters trending about N60°E. This lineation of shallow earthquakes and volcanic activity is attributed to five corresponding normal faults which are named after the five corresponding volcanic centers (Sousaki, Methana, Milos, Santorini and Nisyros). This is supported by a similar trend of the geomorphological features (grabens and islands) and of geophysical features (Bouguer anomalies), as well as by other seismological data (fault plane solutions and the origins of tsunamis) and geological information on the Santorini caldera. The greater volcanic activity in the eastern volcanic centers (Santorini and Nysiros) compared to the western volcanic centers (Sousaki, Methana and Milos) is attributed to the higher rate of extensional crustal deformation. In the eastern part of the volcanic arc it is 26 mm/yr: in the west it is 2 mm/yr. The delineation of the epicenters of the intermediate depth earthquakes along the same five lines indicates the existence of five corresponding rupture zones in the lower (leading) part of the descending lithospheric slab (at depths of 120–180 km). These deep zones are probably the sources of hot material which is ascending vertically upwards and intrudes into the crust along its fracture zones. The orientation of these zones explains the focusing of the macro-seismic results of these deep shocks at narrow regions of the sedimentary arc (Peloponnesus, Crete, etc).
Url:
DOI: 10.1016/0040-1951(93)90237-E
Links to Exploration step
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<front><div type="abstract" xml:lang="en">Abstract: Volcanic centers (volcanoes, fumaroles or solfatara fields), epicenters of strong shallow earthquakes (with focal depths up to 20 km) and epicenters of intermediate depth strong earthquakes (with focal depths between 120 and 160 km) in the southern Aegean volcanic arc can be grouped into five, well defined, linear clusters trending about N60°E. This lineation of shallow earthquakes and volcanic activity is attributed to five corresponding normal faults which are named after the five corresponding volcanic centers (Sousaki, Methana, Milos, Santorini and Nisyros). This is supported by a similar trend of the geomorphological features (grabens and islands) and of geophysical features (Bouguer anomalies), as well as by other seismological data (fault plane solutions and the origins of tsunamis) and geological information on the Santorini caldera. The greater volcanic activity in the eastern volcanic centers (Santorini and Nysiros) compared to the western volcanic centers (Sousaki, Methana and Milos) is attributed to the higher rate of extensional crustal deformation. In the eastern part of the volcanic arc it is 26 mm/yr: in the west it is 2 mm/yr. The delineation of the epicenters of the intermediate depth earthquakes along the same five lines indicates the existence of five corresponding rupture zones in the lower (leading) part of the descending lithospheric slab (at depths of 120–180 km). These deep zones are probably the sources of hot material which is ascending vertically upwards and intrudes into the crust along its fracture zones. The orientation of these zones explains the focusing of the macro-seismic results of these deep shocks at narrow regions of the sedimentary arc (Peloponnesus, Crete, etc).</div>
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<abstract xml:lang="en"><p>Volcanic centers (volcanoes, fumaroles or solfatara fields), epicenters of strong shallow earthquakes (with focal depths up to 20 km) and epicenters of intermediate depth strong earthquakes (with focal depths between 120 and 160 km) in the southern Aegean volcanic arc can be grouped into five, well defined, linear clusters trending about N60°E. This lineation of shallow earthquakes and volcanic activity is attributed to five corresponding normal faults which are named after the five corresponding volcanic centers (Sousaki, Methana, Milos, Santorini and Nisyros). This is supported by a similar trend of the geomorphological features (grabens and islands) and of geophysical features (Bouguer anomalies), as well as by other seismological data (fault plane solutions and the origins of tsunamis) and geological information on the Santorini caldera. The greater volcanic activity in the eastern volcanic centers (Santorini and Nysiros) compared to the western volcanic centers (Sousaki, Methana and Milos) is attributed to the higher rate of extensional crustal deformation. In the eastern part of the volcanic arc it is 26 mm/yr: in the west it is 2 mm/yr. The delineation of the epicenters of the intermediate depth earthquakes along the same five lines indicates the existence of five corresponding rupture zones in the lower (leading) part of the descending lithospheric slab (at depths of 120–180 km). These deep zones are probably the sources of hot material which is ascending vertically upwards and intrudes into the crust along its fracture zones. The orientation of these zones explains the focusing of the macro-seismic results of these deep shocks at narrow regions of the sedimentary arc (Peloponnesus, Crete, etc).</p>
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<head><ce:title>Normal faults associated with volcanic activity arc</ce:title>
<ce:author-group><ce:author><ce:given-name>B.C.</ce:given-name>
<ce:surname>Papazachos</ce:surname>
<ce:cross-ref refid="COR1"><ce:sup>∗</ce:sup>
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<ce:author><ce:given-name>D.G.</ce:given-name>
<ce:surname>Panagiotopoulos</ce:surname>
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<ce:affiliation><ce:textfn>Geophysical Laboratory, University of Thessaloniki, P.O.Box, 352-1, GR 54006, Thessaloniki, Greece</ce:textfn>
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<ce:text>Correspondence to: B.C. Papazachos, Geophysical Laboratory, University of Thessaloniki P.O.Box, 352-1, GR 54006, Thessaloniki, Greece.</ce:text>
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<ce:abstract><ce:section-title>Abstract</ce:section-title>
<ce:abstract-sec><ce:simple-para>Volcanic centers (volcanoes, fumaroles or solfatara fields), epicenters of strong shallow earthquakes (with focal depths up to 20 km) and epicenters of intermediate depth strong earthquakes (with focal depths between 120 and 160 km) in the southern Aegean volcanic arc can be grouped into five, well defined, linear clusters trending about N60°E. This lineation of shallow earthquakes and volcanic activity is attributed to five corresponding normal faults which are named after the five corresponding volcanic centers (Sousaki, Methana, Milos, Santorini and Nisyros). This is supported by a similar trend of the geomorphological features (grabens and islands) and of geophysical features (Bouguer anomalies), as well as by other seismological data (fault plane solutions and the origins of tsunamis) and geological information on the Santorini caldera. The greater volcanic activity in the eastern volcanic centers (Santorini and Nysiros) compared to the western volcanic centers (Sousaki, Methana and Milos) is attributed to the higher rate of extensional crustal deformation. In the eastern part of the volcanic arc it is 26 mm/yr: in the west it is 2 mm/yr. The delineation of the epicenters of the intermediate depth earthquakes along the same five lines indicates the existence of five corresponding rupture zones in the lower (leading) part of the descending lithospheric slab (at depths of 120–180 km). These deep zones are probably the sources of hot material which is ascending vertically upwards and intrudes into the crust along its fracture zones. The orientation of these zones explains the focusing of the macro-seismic results of these deep shocks at narrow regions of the sedimentary arc (Peloponnesus, Crete, etc).</ce:simple-para>
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<abstract lang="en">Abstract: Volcanic centers (volcanoes, fumaroles or solfatara fields), epicenters of strong shallow earthquakes (with focal depths up to 20 km) and epicenters of intermediate depth strong earthquakes (with focal depths between 120 and 160 km) in the southern Aegean volcanic arc can be grouped into five, well defined, linear clusters trending about N60°E. This lineation of shallow earthquakes and volcanic activity is attributed to five corresponding normal faults which are named after the five corresponding volcanic centers (Sousaki, Methana, Milos, Santorini and Nisyros). This is supported by a similar trend of the geomorphological features (grabens and islands) and of geophysical features (Bouguer anomalies), as well as by other seismological data (fault plane solutions and the origins of tsunamis) and geological information on the Santorini caldera. The greater volcanic activity in the eastern volcanic centers (Santorini and Nysiros) compared to the western volcanic centers (Sousaki, Methana and Milos) is attributed to the higher rate of extensional crustal deformation. In the eastern part of the volcanic arc it is 26 mm/yr: in the west it is 2 mm/yr. The delineation of the epicenters of the intermediate depth earthquakes along the same five lines indicates the existence of five corresponding rupture zones in the lower (leading) part of the descending lithospheric slab (at depths of 120–180 km). These deep zones are probably the sources of hot material which is ascending vertically upwards and intrudes into the crust along its fracture zones. The orientation of these zones explains the focusing of the macro-seismic results of these deep shocks at narrow regions of the sedimentary arc (Peloponnesus, Crete, etc).</abstract>
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