Sunaryo, Adi Susilo, Arief Andy Soebroto
Research entitled solidity and earthquake risk level of Lahor dam by means of peak ground acceleration (PGA) data have been conducted to obtain an overview of the distribution of solidity and the level of risk caused by an earthquake. To obtain PGA values, data from the acquisition of microseismic and seismicity data from USGS are used. Based on the results of processing and interpretation, Lahor dam location has the lowest PGA value of 0.01 Gal which is located at the measuring points MZL04, MZL05, MZL07, MZL08 and MZL 26. The highest PGA value is 0.07 Gal which is located at the measuring point MZL28 and MZL33 while the average PGA value is 0.03 Gal. The very low-risk groups with PGA values in the range of 0.01 - <0.03 Gal are distributed at points MZL01-09, MZL13, MZL15-17, MZL21-23 and MZL 32. The low-risk groups with PGA values in the range 0.03 - <0.06 Gal are distributed at points MZL10, MZL14, MZL18-20, MZL24, MZL25, MZL29-31 and MZL35 whereas for the moderate risk 1 group with PGA values in the range 0.06 - 0.07 Gal are distributed at the points of MZL27- 28, MZL33-34. This data corresponds that the very low-risk group is found in solid lithology located on the body of the dam and the dam wall on the exhaust side. The low-risk group in the form of lapilli-tuff and surface sediment layer is located relatively in the middle of the exhaust section. The moderate risk 1 group is located in the exhaust section which is dominated by the soft rock in the form of sediment layers without any pavement. © 2018, World Research Association. All rights reserved.
University of Brawijaya, Indonesia; Informatics Department, University of Brawijaya, Indonesia
