Analysis of Horizontal to Vertical Spectral Ratio (HVSR) Curve Results from Processing using Interpolated Finite Impulse Response (IFIR) Filter

Abstract Microtremor is recorded with a device that very sensitive to subsurface soil vibrations, unwanted noise frequency waves are often also included. For this reason, processing needs be done using filters can attenuate the noise. In previous research, signal decomposition was performed Interpolated Finite Impulse Response (IFIR) filter and resulted attenuation at desired value. Using MATLAB program, microtremor data processed IFIR filtering, smoothing, calculation of: Horizontal Vertical Spectral Ratio (H / V) curve, natural (f0) standard deviation (σ). The same process carried out Butterworth, Gaussian, Cosine as comparison Geopsy program. As result, amplitude characteristics obtained provide value of f 0 < 2.5 Hz. f0 stable, proven by ranging from σ = 0.009 - 0.83 Hz, an average 0.132 conclusion, well-attenuated H/V curve according specified cutoff frequency, which 2 considered capable being applied HVSR method data. Lowpass high-frequency in