Earth:Arias Intensity
From HandWiki
The Arias Intensity (IA) is a measure of the strength of a ground motion.[1] 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.[2] It was proposed by Chilean engineer Arturo Arias in 1970. It is defined as the time-integral of the square of the ground acceleration:
- [math]\displaystyle{ I_A = \frac {\pi} {2g} \int_0^{T_d} a (t)^2 dt }[/math] (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.[3]
The Arias Intensity could also alternatively be defined as the sum of all the squared acceleration values from seismic strong motion records.[2]
References
- ↑ "New predictive equations for Arias intensity from crustal earthquakes in New Zea". Journal of Seismology 13 (1): 31–52. doi:10.1007/s10950-008-9114-2. Bibcode: 2009JSeis..13...31S. https://hal.archives-ouvertes.fr/hal-00478434/file/PEER_stage2_10.1007%252Fs10950-008-9114-2.pdf.
- ↑ 2.0 2.1 "7. Seismic landslide hazard zonation". Faculty of Geo-Information Science and Earth Observation of the University of Twente. 2006-09-29. http://www.itc.nl/ilwis/applications/application07.asp.
- ↑ Wolfgang A. Lenhardt (2007). "Earthquake-Triggered Landslides in Austria – Dobratsch Revisited". Jahrbuch der Geologischen Bundesanstalt. http://www.geologie.ac.at/filestore/download/JB1471_193_A.pdf.
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