Comments on earthquake response spectra

Computation of Earthquake Response via Fourier Amplitude Spectra

A theoretical relation is presented between the seismological Fourier amplitude spectrumand the mean squared value of the elastic response, which is defined by Gaussian distribution. Byshifting a general process to its mean value, spectrum of the mean squared value of the displacementis computed from the Fourier amplitude spectrum and the real part of the relative displacementtransfer function ...

Reply Comment on " Earthquake Source Spectra in Eastern North America

Haddon (1996) proposes a theoretical model for earthquake source spectra in eastern North America (ENA), based on certain assumptions regarding the rupture process. He shows that if ENA earthquakes are characterized by very high rupture velocities and fractional stress drop, then their high-frequency S-wave radiation is strongly enhanced relative to that predicted by the simple Brune (1970) sou...

Response to Pearl's comments on principal stratification.

Dr. Pearl invites researchers to justify their use of principal stratification. This comment explains how the use of principal stratification simplified a complex mediational problem encountered when evaluating a smoking cessation intervention's effect on reducing smoking withdrawal symptoms.

Response to Reviewers ’ Comments

On the response spectra of cracked beams under different types of moving force

In this paper, the dynamic responses of cracked beams under different moving forces, including moving load, moving mass, moving oscillator, and four-degrees-of-freedom moving system, are investigated. Structural elements such as beams are designed to withstand the predicted loads, but unfortunately, they are always exposed to unpredictable damage such as cracks. Several factors may cause these ...