Surface-wave analysis in the Taipei basin from strong-motion data

Fundamental-mode Love waves, with period ranging from 2 to 7 sec, were reco rded by the dense strong-motion network in Taipei basin, during the June 5, 1994 Nanao earthquake, In the frequency-wavenumber spectra, the Love waves propagating in the direction from the epicenter to the basin were verified to be the principal phases in this period range, Using the interstation su rface-wave inversion method, the shallow crustal structure beneath the basi n was determined. Results show that the shear-wave velocities of 1 to 4 km deep layers are in the range from 2.1 to 2.4 km/sec, Accordingly, a lateral variation derived within the basin is evident.