000018288 001__ 18288
000018288 005__ 20170118182215.0
000018288 04107 $$aeng
000018288 046__ $$k2017-01-09
000018288 100__ $$aYamamoto, Hidekazu
000018288 24500 $$aEstimation of Phase Velocities of Love Wave From Three-Component Microtremor Array Observations By Using Spatial Auto-Correlation and Frequency Wavenumber Analysis

000018288 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018288 260__ $$b
000018288 506__ $$arestricted
000018288 520__ $$2eng$$aMicrotremor array technique was a method to estimate S-wave velocity profiles by using dispersions of surface waves from microtremor array records. Rayleigh waves in vertical microtremors were frequently used because of convenient means of array measurements in fields. However, it was difficult to estimate parameters of Vs and thickness in the velocity profiles by using only the dispersions of Rayleigh waves. If other observable geophysical values, e.g. Love wave dispersions, can be used, the unique solvability will be better for the microtremor array technique. Our study tries to detect not only dispersion curves of Rayleigh waves but also those of Love waves from three-component microtremor array records by using threecomponent spatial auto-correlation (SPAC) technique and horizontal frequency-wavenumber (F-K) spectral analysis. At the ground of Iwate University in Morioka City in the northern Honshu Japan, the applicability of SPAC method and F-K method for estimating phase velocities of Love wave in microtremors using a three-component array consisting of 10 sensors was studied. As a result, SPAC method and FK method in different type triangular arrays with same sensor number with different orientations was able to obtain the same phase velocities. For the case of the circular array consisting of nine sensors on a circumstance with same radius and one at a center, both method gave better dispersion of Love wave in a wide frequency range. It was possible to obtain dispersion curves in a wide frequency band using arrays consisting of 10 sensors. In the horizontal microtremor analysis it was possible to obtain the phase velocities of the Love wave using both FK method and SPAC method in a wide frequency band.

000018288 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018288 653__ $$aThree-component microtremor array observation, Love wave dispersion, Spatial Autocorrelation (SPAC) analysis, frequency-wavenumber (FK) analysis

000018288 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018288 720__ $$aYamamoto, Hidekazu$$iSaito, Tsuyoshi
000018288 8560_ $$ffischerc@itam.cas.cz
000018288 8564_ $$s1164791$$uhttps://invenio.itam.cas.cz/record/18288/files/1171.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1171.
000018288 962__ $$r16048
000018288 980__ $$aPAPER