A Study on Response Duration Time Spectra of Earthquake Motions in Tokyo

Abstract eng:
The Response Duration Time Spectrum is newly defined as a duration time where the cumulative squared amplitudes increase from 5% to 95% of the one for the total duration of the response motion of a single degree of freedom system with damping factor h and natural period T. The velocity response spectra SV and the velocity response duration time spectra TSV with damping factors 0.05 and 0.01 are calculated and examined, by using the earthquake ground motion records in Tokyo. In the period range less than 1 second, TSV gradually increases with the period and seems not so different between the earthquakes. However, in the period range more than 1 second, TSV increases suddenly with the period, contains a spectral peak especially for a shallow earthquake, which is characteristic of long period seismic waves due to the hypocentral fault and the underground structure. It seems that the characteristics of TSV highly depend on the hypocentral direction and on the hypocentral depth. SV and TSV are also calculated by using the mended record and the evaluated ground motions in Tokyo for the inter-plate great earthquakes along the Sagami trough, and compared to each other.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket