EFFECTIVE FACTORS ON AMPLIFICATION, CASE STUDY CHABAHAR CITY, SOUTHEAST OF IRAN

Amplification factor identify effect of soil characteristics on wave acceleration in ground surface. Som factors affect on amplification factor. This paper analyzes this object. Ground response analysis in Chabahar city, south eastern of Iran, gained by using numerical method (one imensional) and soil equivalent linear behavior and by EERA program. Resulted amplification factors separated according Iran Building Design against earthquake Code, standard 2800, and analyzed. According the analysis, it is found that amplification factor nearly increased from more to less competent ground type (I to III) but this trend don't observe in some sites. To research the reason of this complexity we analyzed another effective factor on amplification, such as impedance ratio. It is found that impedance ratio between bedrock and surface layer and also between layers of any site, is one of the effective factors on amplification. According to the impedance ratios, the reason of the low and high amplification in some sites identified whereas they have less and more competent ground type, respectively.

کلیدواژه ها:

Amplification ، Impedance ratio ، ground type