R.P. Rusnardi, J. Kiyono, S. Vanapalli
Padang city is one of the most populous cities of Indonesia with 1.2 million people that has been subjected to various earthquakes in the past and has a relatively high potential for the same in the near future due to its geological history. This event has prompted to better understand the susceptibility of Padang region soils to various earthquake intensities. Such studies are valuable to provide guidelines with respect to the design and construction of civil infrastructure. In addition to these studies, microtremor array investigation were undertaken at 12-sites to characterize the soil condition in Padang. From the dispersion curve of array observations, the downtown of Padang corresponds to relatively soft soil condition with Vs(30) less than 300m/s of upper 30 m soil profile. The shear velocity results from the microtremor studies were used to classify Padang soil's into soft soils, medium soils and rock. The seismic cone penetration test unit (SCPTu) were conducted up to a depth 25 m for soft soil, and 5m for rock, respectively. The comparison shear velocity for each soil type between microtremor array observation results and soil penetration test results shows a good agreement from 0-4m of depth with 5% average higher from Vs of microtermor value for rock soil type (layer 1) and 0-25m of depth is good agreement with 1% average higher from microtremor value for soft soil type. Based on these studies numerical analysis from microtremor observation has high accurate to determine soil characteristic. © 2018 11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy. All rights reserved.
Dept. of Civil Engineering, Universitas Negeri Padang, Indonesia; Graduate School of Engineering, Kyoto University, Japan; Dept. of Civil Engineering, Ottawa University, Canada
