| Summary: | Plaosan Temple is a Buddhist Temple which has the value of art, history and
culture. Plaosan Temple and its surrounding areas located on top of Merapi
Quartenary sediment and its eastern of Opak River where is prone to damage from
earthquakes. As part of effort to mitigate earthquakes disaster, it�s needed to study of
mapping that is vulnerable to earthquake waves.
Seismic microzonation is a method that utilizes microtremor survey to
observe how the influence of site effect and soft soil of the building in an area (Irjan
dan Bukhori, 2011). Microtremor is weak vibration in the earth�s surface continous
vibration sources such as human activity, industry and traffic. Other source that are
natural like the wind-bulding interaction, currents and ocean waves. The purpose of
this analysis is to determine microtremor dynamic characteristics of the surface soil
layer such as natural frequency (f
Based on the microtremor measurement results of Plaosan and its surrounding
area, generally have a dominant frequency ranging from 0.5 to 1.1 Hz. Whereas the
dominant amplification values ranging from 2 to 4. As well as having a dominant
seismic vulnerability values ranging from 1 to 22. Based on the analysis results,
Plaosan and its surrounding areas have high potential earthquake disaster. That is
because the geological conditions of the area that has the properties of unconsolidated
sediment is resulted from volcanic activity and have a thick sediment ranged between
80-138 meters.
0) and the amplification factor (A). Nakamura
HVSR method is an empirical technique to estimate the resonance characteristics of
the sediment layers below the surface (Lermo, 1988 in Ratdomopurbo, 2006).
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