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Bracketed and normalized durations of earthquake ground acceleration
Author(s) -
Kawashima Kazuhiko,
Aizawa Koh
Publication year - 1989
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290180709
Subject(s) - acceleration , duration (music) , peak ground acceleration , seismology , geodesy , magnitude (astronomy) , geology , ground motion , physics , acoustics , classical mechanics , astronomy
Multiple regression analyses of the duration of earthquake ground acceleration are presented. Two types of duration are considered, i.e. bracketed duration and normalized duration. The bracketed duration t a is defined as the elapsed time between the first and last acceleration excursions greater than a [cm/s 2 ], and the normalized duration T α is defined as the elapsed time between the first and last acceleration excursions greater than α times (0 < α < 1) the peak acceleration. Employed are 394 components of horizontal strong motion acceleration records obtained at 67 free field sites in Japan. With the use of multiple regression analysis, the dependence of the bracketed and normalized durations on earthquake magnitude and epicentral distance is studied.