Seismic Attenuation – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Calendar > 2007 > Seismic Attenuation

Seismic Attenuation

Seismic Attenuation

Colloquium by Thomas R.N. Jansson, Niels Bohr Institute 

A seismic wave transversing the earth will loose energy during the transit due to geometric spreading and the reflection and transmission of energy at the boundaries but also from internal friction as mineral dislocation and heating at grain boundaries inside the earth. This attenuation is described by a quality factor, Q, which indicates the loss of energy per cycle of oscillation of the wave. Q has the property that it is considerably more sensitive to temperature variations than elastic velocity which makes tomography based on attenuation interesting when mapping thermal structures in the earth. The talk will cover seimic attenuation in general and report on some examples of attenuation based tomography. The talk will be given in danish.