Seismicity in the Hellenic Volcanic Arc: relation between seismic parameters and the geophysical fields in the region
Identifieur interne : 000349 ( Main/Exploration ); précédent : 000348; suivant : 000350Seismicity in the Hellenic Volcanic Arc: relation between seismic parameters and the geophysical fields in the region
Auteurs : Theodoros M. Tsapanos [Grèce] ; Dimitrios Galanopoulos [Grèce] ; Paul W. Burton [Royaume-Uni]Source :
- Geophysical Journal International [ 0956-540X ] ; 1994-06.
Abstract
A study of the spatial distribution of seismicity and seismic hazard and geophysical parameters is undertaken along the Hellenic Volcanic Arc (HVA). Seismicity of the area is divided in a cellular manner allowing analysis of the localized seismicity parameters and representation of their regional variation as contour maps. Extreme value analysis locates a zone of highest seismicity just west of centre of the HVA, around the Cyclades Islands. Non-probabilistic modelling of the strain energy release process in terms of magnitudes equivalent to the average annual energy release rate (M2) and the maximum possible energy release in a seismic cycle (M3) enhances this picture. Maximum values of M2 and M3 are more tightly localized in the central Cyclades west of Amorgos Island and also in the east of the HVA in the Sporadhes north-west of Rhodes. Isocyclic contours of the waiting times for M3 show values in excess of 70 years in the Cyclades and eastern Sporadhes, i.e. the zones of largest earthquakes show the longest strain accumulation periods. The waiting time for the HVA as a whole is about 54 years, and at present it appears to be about 75 per cent through to accumulation of the notional maximum strain energy. The b value of the magnitude-frequency distribution shows a consistent spatial variation along the HVA which is not sensitive to subdivision into different focal depth ranges. Regional contour maps of the b values, and maps of local values of heat flow, magnetic and electrical anomalies compared with the Bouguer gravity anomaly map, indicate correlations which reflect the deformation of the Aegean shallow crust in relation to the deep intrusive magmatic processes. The correlations between the different geophysical fields are displaced commensurate with an Aegean extension of approximately 45 km.
Url:
DOI: 10.1111/j.1365-246X.1994.tb02462.x
Affiliations:
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Tsapanos</name><affiliation wicri:level="1"><country xml:lang="fr">Grèce</country><wicri:regionArea>Geophysical Laboratory, Aristotelian University of Thessaloniki, GR-54006 Thessaloniki, Macedonia</wicri:regionArea><wicri:noRegion>Macedonia</wicri:noRegion></affiliation></author><author><name sortKey="Galanopoulos, Dimitrios" sort="Galanopoulos, Dimitrios" uniqKey="Galanopoulos D" first="Dimitrios" last="Galanopoulos">Dimitrios Galanopoulos</name><affiliation wicri:level="1"><country xml:lang="fr">Grèce</country><wicri:regionArea>PO Box 9, GR-19013 Anavissos</wicri:regionArea><wicri:noRegion>GR-19013 Anavissos</wicri:noRegion></affiliation></author><author><name sortKey="Burton, Paul W" sort="Burton, Paul W" uniqKey="Burton P" first="Paul W." last="Burton">Paul W. 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Extreme value analysis locates a zone of highest seismicity just west of centre of the HVA, around the Cyclades Islands. Non-probabilistic modelling of the strain energy release process in terms of magnitudes equivalent to the average annual energy release rate (M2) and the maximum possible energy release in a seismic cycle (M3) enhances this picture. Maximum values of M2 and M3 are more tightly localized in the central Cyclades west of Amorgos Island and also in the east of the HVA in the Sporadhes north-west of Rhodes. Isocyclic contours of the waiting times for M3 show values in excess of 70 years in the Cyclades and eastern Sporadhes, i.e. the zones of largest earthquakes show the longest strain accumulation periods. The waiting time for the HVA as a whole is about 54 years, and at present it appears to be about 75 per cent through to accumulation of the notional maximum strain energy. The b value of the magnitude-frequency distribution shows a consistent spatial variation along the HVA which is not sensitive to subdivision into different focal depth ranges. Regional contour maps of the b values, and maps of local values of heat flow, magnetic and electrical anomalies compared with the Bouguer gravity anomaly map, indicate correlations which reflect the deformation of the Aegean shallow crust in relation to the deep intrusive magmatic processes. The correlations between the different geophysical fields are displaced commensurate with an Aegean extension of approximately 45 km.</div></front></TEI><affiliations><list><country><li>Grèce</li><li>Royaume-Uni</li></country></list><tree><country name="Grèce"><noRegion><name sortKey="Tsapanos, Theodoros M" sort="Tsapanos, Theodoros M" uniqKey="Tsapanos T" first="Theodoros M." last="Tsapanos">Theodoros M. Tsapanos</name></noRegion><name sortKey="Galanopoulos, Dimitrios" sort="Galanopoulos, Dimitrios" uniqKey="Galanopoulos D" first="Dimitrios" last="Galanopoulos">Dimitrios Galanopoulos</name></country><country name="Royaume-Uni"><noRegion><name sortKey="Burton, Paul W" sort="Burton, Paul W" uniqKey="Burton P" first="Paul W." last="Burton">Paul W. Burton</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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