This
study examines the possibility of ambient noise seismic interferometric
applications to the Philippines, consisting of many large and small islands. We
explored the use of conventional data processing methods and their effectiveness
in generating dispersion measurements in the period from 5 s to 50 s. We used 10
months of data for 27 broadband seismic stations. The component rotation was
also performed for the extraction of Rayleigh waves from body wave contaminated
cross-correlation functions. Dispersion measurements were conducted, although
there were still several challenges to the application of interferometry.
Parameters such as
signal-to-noise ratio, stack number, interstation distance, power spectral
density plots and cross-correlation symmetry were analyzed in relation to the
feasibility of obtaining dispersion measurements. The Rayleigh-wave phase
velocities were stably estimated for selected station pairs in comparison to
group velocities. The phase velocities were also obtained regardless of
azimuth, indicating that the directional dependency of seismic ambient noise is
small.
Keywords: ambient noise,
interferometry, dispersion measurements, Rayleigh wave, the Philippines.