Site Effect Analysis in the TaipeiBasin: Results from TSMIP Network Data

                                      Reporter: Shih-Chi Lin

                                            ABSTRACT

                     The Taipei basin is a triangle-shaped formation. The ground surface 
                   of the basin is almost flat, but tilting gently to the northwest. The 
                   geological structure inside the basin consists of Quaternary layers above 
                   the Tertiary base rock.

                     A dense strong motion observation network has operated in the Taipei 
                   area since 1991 , as part of the Taiwan Strong Motion Istrumentation 
                   Program (TSMIP). 

                     Characteristics of site effects in the Taipei basin are studied using the 
                   data recorded by this observation network. In this study, the method of 
                   amplitude spectrum ratio is used to analyze site effects in the TaipeiBasin.

                     This analysis clearly shows that the spectral ratio contours at low 
                   frequency bands ( 0.2 – 1 HZ ) correlate with the structures of the Tertiary 
                   basement shape and the top soft soil layer. For the highter frequency band 
                   ( 1 – 3 HZ ), the main amplification effects occur near the north, east, and 
                   south basin edges.

                                            Reference

                   Site Effect Anylisis in the TaipeiBasin: Results from TSMIP Network Data,
                   TAO, Vol. 9, NO. 4, 691-704, December 1998.

                                    
                                             (Abstract)(Full text)

                   Wen, K.-L., H.-Y. Peng, L.-F. Liu and T.-C. Shin (1995b). Basin effects 
                   analysis from a dense strong motion observation network: 
                   Earthq. Eng. Struct. Dyn, 24(8), 1069-1083.

 
                                             (Abstract)(Full text)