Research on Earthquake Induced Liquefaction in Padang City and Yogyakarta Areas

Awareness and research on earthquake resistant building design has been intensively carried out after the fatal earthquakes in Indonesia in recent decades. However, less attention has been given to the phenomena of liquefaction due to lack of ground motion information and records at the hazard areas. In this paper, seismic ground response after two deadly earthquakes shocked Java and Sumatera (Indonesia) in 2006 and 2009 was evaluated based on the CPT data. Based on back-calculation results, the possible ground accelerations were expected to be about 0.48g and 0.14g in those liquefied areas at Yogyakarta (Southern Java) and Padang (West Sumatera) respectively. Those accelerations are likely to make 50% of the thickness of sand layer liquefied and induced about 1% ground settlement Keywords : liquefaction, peak ground acceleration, silty sand, CPT

[1]  H. Thio,et al.  Attenuation Relations of Strong Ground Motion in Japan Using Site Classification Based on Predominant Period , 2006 .

[2]  Peter K. Robertson,et al.  Liquefaction Potential of Sands Using the CPT , 1985 .

[3]  P. Robertson,et al.  Estimating liquefaction induced ground settlements from CPT for level ground , 2002 .

[4]  A. Tohari,et al.  LIQUEFACTION POTENTIAL AT PADANG CITY: A COMPARISON OF PREDICTED AND OBSERVED LIQUEFACTIONS DURING THE 2009 PADANG EARTHQUAKE , 2011 .

[5]  方 火浪,et al.  Soil liquefaction during earthquakes and improvement effects by sand compaction piles , 1995 .

[6]  Kuo-Liang Wen,et al.  Nonlinear Soil Response a Reality? , 2022 .

[7]  Yanli Wang,et al.  Study of Effects of Fines Content on Liquefaction Properties of Sand , 2010 .

[8]  P. Robertson,et al.  Evaluating cyclic liquefaction potential using the cone penetration test , 1998 .

[9]  W. Silva,et al.  Strong Ground Motion Attenuation Relationships for Subduction Zone Earthquakes , 1997 .

[10]  Masyhur Irsyam,et al.  Proposed seismic hazard maps of Sumatra and Java islands and microzonation study of Jakarta city, Indonesia , 2008 .

[11]  I. M. Idriss,et al.  Moduli and Damping Factors for Dynamic Analyses of Cohesionless Soils , 1986 .

[12]  Gail M. Atkinson,et al.  Empirical Ground-Motion Relations for Subduction-Zone Earthquakes and Their Application to Cascadia and Other Regions , 2003 .

[13]  Effect of soil type on seismic demand , 2013 .

[14]  Dwikorita Karnawati,et al.  The Yogyakarta Earthquake of May 27, 2006 , 2008 .

[15]  T. Leslie Youd,et al.  Influence of soil softening and liquefaction on spectral acceleration , 2005 .

[16]  W. F. Marcuson,et al.  Liquefaction Resistance of Soils: Summary Report from the 1996 NCEER and 1998 NCEER/NSF Workshops on Evaluation of Liquefaction Resistance of Soils , 2001 .