The model of radar observation of the surface vibration waves generated by earthquake source (ground vibrator)

Abstract

This research article is continuation case study based on a model of radar monitoring of vibration waves occurring on the sea surface near the source of a bottom earthquake. The vibration wave is generated parametrically, has near (hydrodynamic) and far (sound) components. The amplitude of the near (generating) wave depends on the bottom vibrator parameters and the depth of the bottom, the far wave propagates in the waveguide formed by the surface and the flat bottom. The vibrator will be installed at a shallow depth (30 m) and the modern aircraft radar will be used to create amplitude and velocity radar images during the experiment. The length of the generated vibration wave will be ~1.5 cm, which corresponds to the frequency of the generating wave ~30 Hz and the “resonant” wave of the radar with a length of ~3 cm (radar X-band). The possibility of monitoring vibration waves in the amplitude and velocity channels of the SAR (synthetic aperture radar) in L, P and UHF-bands is estimated. Also, the expected view of the SAR images is shown. Calculations of the necessary parameters of the aircraft radar are provided, including algorithms for processing the initial signal when creating amplitude and velocity radar images of vibration waves.