DOI: 10.5176/2251-3353_GEOS13.12
Authors: Anchalee Luddakul, Passakorn Pananont and Thanu Harnpattanapanich
Abstract: Knowledge of how a ground acceleration or velocity attenuates with the epicentral distance is essential to the estimation of seismic hazard at a given site. In the absence of the instrumental ground acceleration or velocity data, this attenuation relationship could be obtained indirectly through a study of how felt-intensity attenuates with the epicentral distance. In order to obtain the felt-intensity and epicentral distance relationship, the macroseismic surveys of twenty-eight felt earthquakes with magnitudes ranging from M 2.2 to M 7.0 occurring in Thailand and nearby during 2005 to 2012 were conducted to provide such data. Using the regression analysis, the following equation:
I(R) – Io = a + bR + clog(R), can be obtained. Where I(R) is the intensity level as a function of R; the epicentral distance. Io is the intensity at epicenter or the maximum intensity. a, b and c are regression coefficients.
Keywords: Attenuation equation, Macroseismic, Earthquake Hazard
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