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Far-Field Motions in Singapore during the December 2004 and March 2005 Great Sumatra Earthquake and the March 2005 Nias-Simeulue Earthquake

2006; SAGE Publishing; Volume: 22; Issue: 3_suppl Linguagem: Inglês

10.1193/1.2205170

8755-2930

Tso‐Chien Pan, keddadouche Karim, Xuting You, Chee Leong Lim, C. L. Leong,

Seismic Waves and Analysis

The frequency content of accelerograms, recorded at the basement of the Singapore Republic Plaza (RP) high-rise commercial building during the 26 December 2004 earthquake, was concentrated within a frequency band of 0.04–0.1 Hz. This observation explains why the ground motions did not cause much response in the buildings or by the citizens in Singapore. Occupants of only a few high-rise buildings in Singapore felt the vibrations. A finite element model (FEM) of the RP building computed displacement time histories at the roof level that were similar to the displacement traces obtained by integrating the accelerograms recorded at that level. However, the computed velocity and acceleration responses were not similar to the recorded motions. Ground motions recorded during the 28 March 2005 event were generally larger than the motions recorded during all other previous events, including the 26 December event.