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・ Ariarathes II of Cappadocia
・ Ariarathes III of Cappadocia
・ Ariarathes IV of Cappadocia
・ Ariarathes IX of Cappadocia
・ Ariarathes V of Cappadocia
・ Ariarathes VI of Cappadocia
・ Ariarathes VII of Cappadocia
・ Ariarathes VIII of Cappadocia
・ Ariarathes X of Cappadocia
・ Ariaria International Market
・ Ariaric
・ Arias & Symphonies
・ Arias (moth)
・ Arias (surname)
・ Arias G. Belnap
Arias Intensity
・ Arias Pérez
・ Arias Soga
・ Arias with a Twist
・ Arias, Córdoba
・ Arias-Stella reaction
・ Ariaspis
・ Ariassos
・ Ariastes
・ Ariastes monostigma
・ Ariastes muellerae
・ Ariat
・ Ariate
・ Ariathisa
・ Ariau Towers


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Arias Intensity : ウィキペディア英語版
Arias Intensity
The Arias Intensity (IA) is a measure of the strength of a ground motion. It determines the intensity of shaking by measuring the acceleration of transient seismic waves. It has been found to be a fairly reliable parameter to describe earthquake shaking necessary to trigger landslides. It was proposed by Chilean engineer Arturo Arias in 1970.
It is defined as the time-integral of the square of the ground acceleration:
: I_A = \frac \int_0^ a (t)^2 dt (m/s)
where ''g'' is the acceleration due to gravity and Td is the duration of signal above threshold. Theoretically the integral should be infinite.
The Arias Intensity could also alternatively be defined as the sum of all the squared acceleration values from seismic strong motion records.〔
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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