Water Reverberations on Vertical Component Records of OBSs

Multiple reflections trapped within the seawater column, termed as water reverberations, severly affect teleseismic waveforms recorded by ocean-bottom seismometers. These reverberations make the calculation of receiver functions unsuccessful.

Water Layer Filter

With the assumption of vertical incidence, the impulse response of the water layer can be expressed with two parameters: a two-way traveltime wihtin the water layer, τ, and a reflection coefficient on the seafloor, R.

Receiver Function with Removal of Water Reverberations

The inverse of the water layer filter diminishes the effect of water reverberations on vertical component records, thus leading to successful receiver function estimation. Synthetic tests demonstrated the effectiveness of the inverse water-layer filter technique.

Application to the Nankai trough megathrust