Home > The Journal of JAEE > The JAEE Journal Vol. 19 (2019) No. 3

The JAEE Journal Vol. 19 (2019) No. 3

Technical Papers

ATTENUATION CHARACTERISTICS OF MAJOR ACTIVE FAULTS ESTIMATED FROM TWOFOLD SPECTRAL RATIO METHOD
P3_1-3_21
Masayuki YAMADA, Yoshiya ODA
Released: June 28, 2019

PDF[8060K]

abstract

This study presents the relation between the an estimatedion of P-wave attenuation characteristics accross the active fault line and the stress state characteristics of the fault their relation to the active faults forcovering the 12 major active faults zones in Japan. We employed a twofold spectral ratio method to estimate the attenuation characteristics of the active faults. As a result of a review of the differences in the attenuation characteristics, a clear positive correlation with the ratio of the lapse time from the previous earthquake was confirmed. These results suggest that the attenuation characteristics estimated in this study may reflect the stress state of thean active fault.

EFFECTS OF DIFFERENT WAYS OF COUNTING FAULT AREA FOR ASPERITY MODEL OF CRUSTAL EARTHQUAKES ON FAULT PARAMETERS AND PREDICTED STRONG GROUND MOTIONS
P3_22-3_37
Masanobu TOHDO, Atsuko OANA, Kazuo DAN
Released: June 28, 2019

PDF[3790K]

abstract

The effects of two different ways of counting fault areas, that are the seismic fault area and the entire ruptured fault area, on the strong ground motions from the faults 30 km and 50 km long were small for peak ground accelerations and comparatively large for peak ground velocities and response spectra in the longer period range. On the other hand, the effects on the strong ground motions from the fault 200 km long were little for peak ground accelerations or peak ground velocities while the effects were a little for response spectra in the period range longer than 3 seconds.

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