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Seismic properties in the eastern part of the South Aegean volcanic arc

Identifieur interne : 000501 ( Main/Exploration ); précédent : 000500; suivant : 000502

Seismic properties in the eastern part of the South Aegean volcanic arc

Auteurs : G. A. Papadopoulos [États-Unis]

Source :

RBID : ISTEX:F8876BECD28BD2B06DF29E49B5FC5AE9847E6301

Descripteurs français

English descriptors

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>Cumulative distributions</term>
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<term>Papadopoulos</term>
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<term>Seismic properties</term>
<term>Seismicity</term>
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<term>Depth earthquakes</term>
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<term>Historical earthquakes</term>
<term>Intermediate depth</term>
<term>Intermediate depth earthquakes</term>
<term>Intermediate depth seismicity</term>
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<term>Magmatic body</term>
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<term>Seismic isodepth</term>
<term>Seismic magnitudes</term>
<term>Seismic properties</term>
<term>Seismicity</term>
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<term>Shallow seismogenetic layer</term>
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<term>Tectonic earthquakes</term>
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<term>Typical orogenic series</term>
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<term>Volcanic activity</term>
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<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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