Gravity and the earthquake mechanism |
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| Authors: | NJ Vlaar MJR Wortel |
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| Institution: | Vening Meinesz Laboratory, University of Utrecht, Utrecht The Netherlands |
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| Abstract: | Earthquake sources exhibiting anelastic volume changes are studied in a gravitating earth. The excitation of seismic displacement fields by such sources cannot be fully described by a moment tensor.The effect of gravity manifests itself through the action of a buoyancy force at the source, which is compensated by a continuous distribution of volume forces through the earth.An inversion scheme which does not take into account these gravitational forces may lead to a pseudo-precursive action in the source and to an erroneous source characterisation. |
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