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In 2006 a large earthquake ever occurred in the province of Yogyakarta, which caused considerable damage. This is the basis need to investigate the seismic vulnerability index in a round of the earthquake zone. This research is called microzonation of earthquake hazard. This research has been conducted at the site and surrounding of Prambanan. The reason this research needs to be done because in the event of an earthquake in 2006, there was damage to the temples at Prambanan temple complex and its surroundings. In this research, data collection carried out for 60 minutes using three component seismograph measurements at 89 points with spacing of 1000 meters. The data recorded in time function were analyzed using the spectral ratio method, known as the Horizontal to Vertical Spectral Ratio (HVSR). Results from this analysis are dominant frequency (Fg) and amplification factor (Ag) are used to obtain seismic vulnerability index. The results of research showed the dominant frequency range from 0.2 to 21 Hz and the amplification is in interval from 0.2 to 7. Interval value for seismic vulnerability index is 0.1 to 28.

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Frequency Analysis and Sismic Vulnerability Index by Using Nakamura Methods For Microzonation at Prambanan Temple and Its Surrounding Area, Yogyakarta Province, Indonesia