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Re: EQ resistant Design

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Constant direction of  motion means that the amplitudes of its vector
(say acceleration components, ax(t), ay(t) and az(t)) are affine in time,
that is, the ratios ax(t)/ay(t)/az(t) remain constant during the seismic
Simple observation of any three-component accelerogram suffices to prove
that component maxima do not  happen simultaneously, that means the
resultant vector describing the seismic motion does not keep its direction

S. Papageorgiou

-----Original Message-----
> Subject: Re: EQ resistant Design
> From: Christopher Wright <chrisw(--nospam--at)>
> To: "SEAOC Newsletter" <seaint(--nospam--at)>
> My understanding is that the horizontal motion is pretty much wave motion
> in the direction of slip along a fault, although reflections and
> diffraction change that. The motion is oscillatory so it changes in
> magnitude but not in direction. I don't see how surface wave motion can
> change direction.

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