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:
- (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" (PDF). Journal of Seismology. 13 (1): 31–52. Bibcode: 2009JSeis..13...31S. doi: 10.1007/s10950-008-9114-2.
- ^ a b "7. Seismic landslide hazard zonation". Faculty of Geo-Information Science and Earth Observation of the University of Twente. 2006-09-29. Archived from the original on 2010-08-15. Retrieved 2010-12-12.
- ^ Wolfgang A. Lenhardt (2007). "Earthquake-Triggered Landslides in Austria – Dobratsch Revisited" (PDF). Jahrbuch der Geologischen Bundesanstalt. Archived from the original (PDF) on 2011-05-31.
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