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Abstract

The combined seismic reflection and refraction measurements in the Urach area have revealed many details of the geothermal anomaly. Horizontal velocities show a minimum at the center of the anomaly in the uppermost part of the crystalline basement. (Vertical) stacking velocity show this velocity minimum to extend down to the bottom of the crust showing up to 5 % velocity variations at deep crustal levels as compared to the average value along the profile I. This effect is stronger than predicted from theoretical calculations of the thermal effect of a temperature difference of 50 or 100 degrees C. The center of and the Urach anomaly coincides with a relative maximum of crustal thickness and with a change of dip of deep crustal reflectors. Some indications of faults, possibly important for magma breakthrough, could be mapped along the profiles.

Additional information

Authors: MEISSNER R, UNIVERSITAET KIEL (GERMANY);PRAKLA-SEISMOS, HANNOVER (GERMANY);BARTELSEN H, UNIVERSITAET KIEL (GERMANY);PRAKLA-SEISMOS, HANNOVER (GERMANY);KREY T, UNIVERSITAET KIEL (GERMANY);PRAKLA-SEISMOS, HANNOVER (GERMANY);SCHMOLL J UNIVERSITAET KIEL (GERMANY), UNIVERSITAET KIEL (GERMANY);PRAKLA-SEISMOS, HANNOVER (GERMANY);PRAKLA-SEISMOS, HANNOVER (GERMANY), UNIVERSITAET KIEL (GERMANY);PRAKLA-SEISMOS, HANNOVER (GERMANY)
Bibliographic Reference: EUR 8298 EN (1984) MF, 21 P., BFR 120, EUROFFICE, LUXEMBOURG POB 1003
Availability: Can be ordered online
Record Number: 1989122033000 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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