Abstract
Array Observations for Long-Period Basin Ground Motions in the Taipei Region during the M 7.1 Eastern Taiwan Offshore Earthquake of 31 March 2002
Highlights
The Taipei basin is a triangular-shaped, tectonically controlled basin
To enhance the long-period seismic wave propagation characteristics, the recorded accelerograms were converted to velocity seismograms and used a band-pass filter with corner frequencies of 0.1 and 1.0 Hz, respectively for further analysis
The spatial distribution of those trajectories shows that the ground motions are significantly amplified in the sedimentary basin region of Taipei area and the major amplifications are found on its eastern edge and the covered deep sediment’s western basin
Summary
The Taipei basin is a triangular-shaped, tectonically controlled basin. Its western border is delimited by the Shanchiao fault, which separates it from the Linkou Tableland. Its southeastern boundary is marked by the Taipei fault, across from which stand the Western Foothills, while its northern rim is bordered by the Tatun Volcano Group (Fig. 1). The ground surface of Taipei basin is almost flat and tilting gently to the northwest. The basin sediments, shear wave velocities were estimated from 170 to 650 m sec-1 and jump to 1200 m sec-1 in the basement (Wen and Peng 1998). P-wave velocities were estimated from 450 to 3000 m sec-1 in the basin (Wen et al 1995; Wen and Peng 1998). According to the large shear wave velocity contact across the basement interface (~ 600 m sec-1), the trap of seismic waves inside the basin and the amplification ground motion in surface are expected
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