Seismic properties in the eastern part of the South Aegean volcanic arc
Identifieur interne : 000501 ( Main/Exploration ); précédent : 000500; suivant : 000502Seismic properties in the eastern part of the South Aegean volcanic arc
Auteurs : G. A. Papadopoulos [États-Unis]Source :
- Bulletin Volcanologique [ 0366-483x ] ; 1984-03-01.
Descripteurs français
- Wicri :
- topic : Séisme.
English descriptors
- KwdEn :
- Active tectonics, Aegean area, Aegean region, Aegean volcanics, Cumulative distributions, Depth earthquakes, Distinct regions, Earthquake, Eastern part, External region, External regions, First form, Focal depth, Force academy, Geophys, Heterogeneous structure, High concentration, High seismicity, Historical earthquakes, Intermediate depth, Intermediate depth earthquakes, Intermediate depth seismicity, Internal region, Magma formation, Magmatic, Magmatic body, Magmatic intrusion, Maximum probability, Ninkovichand hays, Nisyros, Nisyros volcano, Nisyroskos area, Other hand, Papadopoulos, Papazachos, Return period, Rhyolitic volcanoes, Seismic, Seismic isodepth, Seismic magnitudes, Seismic properties, Seismicity, Seismogenetic, Seismogenetic layer, Seismotectonic segment, Shallow depths, Shallow earthquakes, Shallow seismicity, Shallow seismogenetic layer, Shallow shocks, Spatial distribution, Subduction zones, Tectonic, Tectonic earthquakes, Thin seismogenetic layer, Typical orogenic series, Upper mantle, Upper mantle wedge, Upper surface, Volcanic, Volcanic activity, Volcanic area, Volcanic zone, Volcanics, Volcano, Whole area.
- Teeft :
- Active tectonics, Aegean area, Aegean region, Aegean volcanics, Cumulative distributions, Depth earthquakes, Distinct regions, Earthquake, Eastern part, External region, External regions, First form, Focal depth, Force academy, Geophys, Heterogeneous structure, High concentration, High seismicity, Historical earthquakes, Intermediate depth, Intermediate depth earthquakes, Intermediate depth seismicity, Internal region, Magma formation, Magmatic, Magmatic body, Magmatic intrusion, Maximum probability, Ninkovichand hays, Nisyros, Nisyros volcano, Nisyroskos area, Other hand, Papadopoulos, Papazachos, Return period, Rhyolitic volcanoes, Seismic, Seismic isodepth, Seismic magnitudes, Seismic properties, Seismicity, Seismogenetic, Seismogenetic layer, Seismotectonic segment, Shallow depths, Shallow earthquakes, Shallow seismicity, Shallow seismogenetic layer, Shallow shocks, Spatial distribution, Subduction zones, Tectonic, Tectonic earthquakes, Thin seismogenetic layer, Typical orogenic series, Upper mantle, Upper mantle wedge, Upper surface, Volcanic, Volcanic activity, Volcanic area, Volcanic zone, Volcanics, Volcano, Whole area.
Abstract
Abstract: The South Aegean active volcanic arc lies along the 150-km seismic isodepth of a Benioffzone and consists in andesitic, dacitic and rhyolitic volcanoes of an orogenic calc-alkaline type. In the eastern part of the arc there are two main volcanic sites in the Nisyros and Kos islands. High shallow and intermediate depth seismic activity occurs in this volcanic area. Seismological data concerning the 1911–1980 period have been used to investigate seismic properties in that area. Two, distinct regions with different seismotectonic features have been defined. The internal region (Nisyros active volcano and its proximity) is characterized by a shallow, thin seismogenetic layer with abnormally highb-value, locally concentrated stresses, low seismicity and highly heterogeneous structure. These features are probably due to a magmatic body intruded in shallow depths within the crust. The possibility of magma formation in the upper surface of the descending slab or within the upper mantle wedge overlying this slab in the Nisyros-Kos area is herein discussed. On the contrary, the remaining (external) region, including the non-active volcanic island of Kos, is characterized by normal for tectonic shocksb-value, thick seismogenetic layer and high seismicity. It seems that in this region there is not a magmatic intrusion at least in shallow depths within the crust.
Url:
DOI: 10.1007/BF01960545
Affiliations:
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Le document en format XML
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<term>Aegean volcanics</term>
<term>Cumulative distributions</term>
<term>Depth earthquakes</term>
<term>Distinct regions</term>
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<term>External region</term>
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<term>High seismicity</term>
<term>Historical earthquakes</term>
<term>Intermediate depth</term>
<term>Intermediate depth earthquakes</term>
<term>Intermediate depth seismicity</term>
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<term>Magma formation</term>
<term>Magmatic</term>
<term>Magmatic body</term>
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<term>Maximum probability</term>
<term>Ninkovichand hays</term>
<term>Nisyros</term>
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<term>Nisyroskos area</term>
<term>Other hand</term>
<term>Papadopoulos</term>
<term>Papazachos</term>
<term>Return period</term>
<term>Rhyolitic volcanoes</term>
<term>Seismic</term>
<term>Seismic isodepth</term>
<term>Seismic magnitudes</term>
<term>Seismic properties</term>
<term>Seismicity</term>
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<term>Shallow depths</term>
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<term>High seismicity</term>
<term>Historical earthquakes</term>
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<term>Magmatic body</term>
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<term>Seismic magnitudes</term>
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<term>Seismogenetic layer</term>
<term>Seismotectonic segment</term>
<term>Shallow depths</term>
<term>Shallow earthquakes</term>
<term>Shallow seismicity</term>
<term>Shallow seismogenetic layer</term>
<term>Shallow shocks</term>
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<front><div type="abstract" xml:lang="en">Abstract: The South Aegean active volcanic arc lies along the 150-km seismic isodepth of a Benioffzone and consists in andesitic, dacitic and rhyolitic volcanoes of an orogenic calc-alkaline type. In the eastern part of the arc there are two main volcanic sites in the Nisyros and Kos islands. High shallow and intermediate depth seismic activity occurs in this volcanic area. Seismological data concerning the 1911–1980 period have been used to investigate seismic properties in that area. Two, distinct regions with different seismotectonic features have been defined. The internal region (Nisyros active volcano and its proximity) is characterized by a shallow, thin seismogenetic layer with abnormally highb-value, locally concentrated stresses, low seismicity and highly heterogeneous structure. These features are probably due to a magmatic body intruded in shallow depths within the crust. The possibility of magma formation in the upper surface of the descending slab or within the upper mantle wedge overlying this slab in the Nisyros-Kos area is herein discussed. On the contrary, the remaining (external) region, including the non-active volcanic island of Kos, is characterized by normal for tectonic shocksb-value, thick seismogenetic layer and high seismicity. It seems that in this region there is not a magmatic intrusion at least in shallow depths within the crust.</div>
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