Mathematics – Logic
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..88..153c&link_type=abstract
Earth and Planetary Science Letters, Volume 88, Issue 1-2, p. 153-168.
Mathematics
Logic
11
Scientific paper
We invert teleseismic relative residuals recorded in the Thessaloniki seismological network, for the crustal and upper mantle structure beneath Chalkidiki (Northern Greece) where extension is observed to have occurred since Eocene time. After conducting several tests to insure the reliability of the results, a low-velocity anomaly (5-8%) is observed which is located beneath Chalkidiki for the top two layers (0-35 km and 35-85 km); this anomaly is probably related to the fact that the crust is thicker here than beneath the neighboring basins. For the two other layers, with depths between 85 and 145 km and between 145 and 205 km, relatively low velocities (3-5%) are observed beneath the Thermaico Gulf and the Kavala Basin. These results are compared with Lyberis's (1985) [8] calculated shallowing of the isotherms due to extension and thinning of the lithosphere. We conclude that the velocity anomalies that we observe are likely to be due to the intrusion of hot material from the asthenosphere into the gap in the extended lithosphere.
Christodoulou A. A.
Hatzfeld Denis
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