Sunaryo, Adi Susilo, Arief Andy Soebroto
Research entitled resilience of soil and structure of Lahor Dam by means of seismic vulnerability index data has been carried out to obtain a knowledge of the resilience of the Lahor dam caused by the earthquake. The acquisition of microseismic data that will be used to calculate the value of the seismic vulnerability index is carried out at the location points distributed in the body of the dam and the exhaust side at a number of 35 measuring points in the form of a grid with a distance between grid points around 100m. The acquired data is then processed by the HVSR method to obtain amplification factors (A0), dominant frequency (f0), dominant period (T0) and seismic vulnerability index (Kg). Based on the processing and interpretation results, the values A0 1.13 - 6.57 are located at the points MZL31 and MZL29 with an average value of A0 is 3.22. For f0, values of 0.63Hz - 19.05Hz are obtained at points MZL05 and MZL28 with an average value of 4.36Hz. For T0, values of 0.05s - 1.58s are achieved at points MZL05 and MZL28 with an average value of 0.59s, whereas for Kg obtained, values of 0.27 - 17.31 are located in MZL31 and MZL09 with an average value of 5.68. This data shows the weak resilience of soil and structure of the Lahor dam is in the zone of the body on the exhaust side which is characterized by a high Kg value with lithology of alluvial sediment and landfill.
Department of Geophysical Engineering, University of Brawijaya, Indonesia; Department of Informatics, University of Brawijaya, Indonesia
