Modelling short-period crustal phases at regional distances for the seismic source parameter inversion

Details Modelling short-period crustal phases at regional distances for the seismic source parameter inversion Modelling short-period crustal phases at regional distances for the seismic source parameter inversion

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...47..159w&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 47, p. 159-178.

Physics

13

Scientific paper

Waveforms of short-period crustal phases observed at regional distances are modelled in an attempt to retrieve the source parameters of small earthquakes. For a simple shield type crustal structure, the synthetic seismograms calculated for elementary source mechanisms show that the waveforms of crustal phases are quite distinct for different source mechanisms, and suggest that these features can be used to constrain the source mechanisms. Waveforms of the crustal phases are also strongly affected even by small variations in the crustal thickness as well as in the focal depth.
A generalized, linearized waveform inversion technique is used to invert the regional crustal phases for a deviatoric moment tensor source. The inversion technique is applied to regional short-period records from a small earthquake in central Sweden for determining its source parameters. The waveform inversion, which mainly used Lg waves, produced a satisfactory fit between the observed and synthetic records, suggesting that the source mechanism and focal depth estimates were reasonable. The focal depth of 40 km obtained for the event studied suggests the occurrence of a deep crustal earthquake and demonstrates the usefulness of crustal phases in studying small intraplate earthquakes.

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