VULNERABILITY ASSESSMENT OF NON ENGINEERED HOUSES BASED ON DAMAGE DATA OF THE 2009 PADANG EARTHQUAKE IN PADANG CITY, INDONESIA
Keywords:soil profile, Padang earthquake, microtremor array, seismic vulnerability
Several powerful earthquakes have struck Padang during recent years, one of the largest
earthquake event was an M 7.6 that occurred on September 30, 2009 and caused more than 1000 casualties.
Following the event, A 12-site microtremor array investigation to gain a representative determination of the
soil condition of subsurface structures in Padang has been conducted. From the dispersion curve from the array
observations, the central business district of Padang corresponds to relatively soft soil condition with Vs30 less
than 400 m/s. Because only one accelerometer was existing, the 2009 Padang earthquake was simulated to
obtain peak ground acceleration for all sites in Padang city. By considering the damaging data of the 2009
Padang earthquake for engineered houses, Seismic risk vulnerability estimation of non-engineered houses for
rock, medium and soft soil condition can be obtained, and also estimate the loss ratio based on the ground
response, seismic hazard of Padang and the existing damaged to non-engineered structure houses due to Padang
earthquake in 2009 data for 500 return periods of earthquake events.