HR: 1340h
AN: NG43B-0583    [Abstracts]
TI: Teleseismic tomographic inversion of the Tornquist Zone using a Monte Carlo method
AU: * Voss, P
EM: pv@geus.dk
AF: Geological Survey of Denmark and Greenland, Oester Voldgade 10, Copenhagen K, DK-1350 Denmark
AU: Mosegaard, K
EM: klaus@gfy.ku.dk
AF: Niels Bohr Institute University of Copenhagen, Juliane Maries Vej 30, Copenhagen Oe, DK-2100 Denmark
AU: Gregersen, S
EM: sg@geus.dk
AF: Geological Survey of Denmark and Greenland, Oester Voldgade 10, Copenhagen K, DK-1350 Denmark
AB: The lithosphere of North Germany, Denmark and South Sweden contains the transition zone between the Baltic Shield to the northeast and the younger European lithosphere to the southwest, known as the Tornquist Zone. The area has been subject to several teleseismic tomographic studies in order to image this transition zone, but these studies disagree on where the transition is located. We present tomographic results from a Monte Carlo inversion of relative P-phase travel times from 48 teleseismic earthquakes measured across the transition zone on 120 seismometers during the TOR project. The result of the method is 1400 tomographic models that all fit the observations. A priori information that force the model parameters to belong to one of two possible lithopheric types has been applied to the inversion. This approach emphasizes the transition zone and gives by probabilities the affiliation of the model parameters the two lithopheric types. Our results show that the transition zone between the Baltic Shield and the younger European lithosphere is dipping to the northeast and has a width of around 100 km.
DE: 3260 Inverse theory
DE: 4400 NONLINEAR GEOPHYSICS (3200, 6944, 7839)
DE: 7218 Lithosphere (1236)
DE: 7270 Tomography (6982, 8180)
DE: 9335 Europe
SC: Nonlinear Geophysics [NG]
MN: Fall Meeting 2005