15 research outputs found
Surface wave group velocity in the Osaka sedimentary basin, Japan, estimated using ambient noise cross-correlation functions
A Study of the Structure and Magnetic Properties of FeRh1 – xIrx (x = 0.5–1) Alloys by First-Principles Methods
Immunological characterization of serine hydroxymethyltransferase of methylotrophic Hyphomicrobium strains
ALS in the Kii Peninsula of Japan, with Special Reference to Neurofibrillary Tangles and Aluminum
Surface wave group velocity in the Osaka sedimentary basin, Japan, estimated using ambient noise cross-correlation functions
Inter-station cross-correlation functions estimated using continuous ambient noise or microtremor records were used to extract the seismic wave propagation characteristics of the Osaka sedimentary basin, Japan. Temporary continuous observations were conducted at 15 sites in the Osaka basin between 2011 and 2013. The data were analyzed using seismic interferometry. The target period range was 2–8 s. Cross-correlations between all of the possible station pairs were calculated and stacked to produce a year-long data set, and Rayleigh wave signals in the vertical and radial components and Love wave signals in the transverse component were identified from the results. Simulation of inter-station Green’s functions using the finite difference method was conducted to check the performance of the current three-dimensional velocity structure model. The measured time lag between the observed and theoretical Green’s functions was less than 2 s for most station pairs, which is less than the wave period of interest in the target frequency range. Group velocity tomography was applied to group delay times estimated by means of multiple filter analysis. The estimated group velocities for longer periods of 5–8 s exhibited spatial variation within the basin, which is consistent with the bedrock depth distribution; however, the group velocities for shorter periods of 2–3 s were almost constant over the studied area. The waveform and group velocity information obtained by seismic interferometry analysis can be useful for future reconstruction of a three-dimensional velocity structure model in the Osaka basin
Review on localized boundary integral equation: Discrete wavenumber method for 2D irregular layers
Basin effects on ground motion: the case of a high-resolution experiment in Cephalonia (Greece)
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