On the Stability of SPAC and Linear Array Methods

Abstract eng:
The modified SPAC methods such as 2sSPAC and linear array methods allow estimating shear wave structure by using only two sensors, but in these cases the instability problem of the spatial autocorrelation coefficient could arise in frequency range higher than 1Hz. We carried out observations in Tsukuba city, Japan, with four 25m arrays size. We also used 25m triangles’ sides as linear arrays. Results obtained from four 25m triangular arrays with four sensors, as well as from four 25m linear arrays with two sensors, showed good stability of SPAC coefficient for 2-4, 5Hz frequency range. To check the influence of the anthropogenic sources on the results of microtremor array observation the arrays were deployed in different distances from the road passing near by.

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