Seismic Hazard and Microzonation for a District in Banda Aceh City Post 2004 Great Sumatra Earthquake

Abstract eng:
Sumatra 2004 earthquake (Mw=9.3) has caused many building and infrastructure collapsed in the city of Banda Aceh and the surrounding areas. Reconstruction and long-term development of the city requires seismic design criteria that consider potential earthquake sources surrounding the city. Probabilistic seismic hazard analysis (PSHA) that considers both subduction and shallow crustal faults has been conducted herein. The PSHA through de-aggregation analysis indicates that Aceh and Seumeulem faults, that is relatively very close to the city, is the potential source that could generate a big earthquake in the future, since the potential of subduction require long time to accumulate energy for potential another big earthquake. The PSHA indicates that the peak ground acceleration at baserock for 10% and 2% probability of exceedance in 50 years is 0.3g and 0.55g, respectively. The analysis also provides spectral values at short (T=0.2 sec) and long period (T=1.0 sec) motions. Site response analyses for some sites have been conducted for seismic microzonation mapping for Meuraxa District within the city of Banda Aceh. Some spectral analyses of surface wave tests have been conducted for the microzonation mapping. Results of the PSHA, design response spectra for several site-class, and microzonation map are recommended for reconstruction and long-term development of the district after 2004 Great Sumatra earthquake disaster.

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