Abstract
Here, we address several issues regarding the application of an inverse water-layer filter (IWLF) method to observed data. Initially, we present a nonlinear inversion method to determine IWLF parameters. We use vertical components of teleseismic P waveforms as inputs for the inversion and simultaneously solve for a source wavelet, two-way travel times within the water layer, and reflection coefficients on the seafloor. A simulated annealing algorithm is employed for this optimization. We then investigate the validity of the IWLF method using autocorrelation functions. Finally, we observe that radial receiver functions calculated using the IWLF method show clearer phases than those calculated by a typical method.
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Notes
- 1.
This normalization factor is introduced to compensate for variation in observed amplitudes of the direct arrivals among stations. This factor may not be necessary if we attribute the amplitude variation to the difference in reflection coefficients at the seafloor. Indeed, similar results are obtained without the normalization factor (Akuhara et al. 2016).
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Akuhara, T. (2018). Application of Inverse Water-Layer Filter Method. In: Fluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-10-8174-3_3
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DOI: https://doi.org/10.1007/978-981-10-8174-3_3
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