Abstract
We present a method to determine the polarization of body waves from
three-component, high-frequency data and examples of its application.
The method is based on the principal component approach. One advantage
of this approach is that the polarization state can be determined
for small time windows compared with the predominant period of the
wave. This is particularly useful for identifying converted waves
within the crust. The stability of the result is analyzed with synthetic
cases by adding simultaneous arrivals from waves and random noise.
The method works well with both synthetic and local data in the detection
of the polarization of the wave by separating arrivals from different
directions. From the local data, some seismic phases related to crustal
conversions are observed that require strong lateral variations.
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