| Penulis/Author |
Nugroho Budi Wibowo (1); Prof. Ir. Teuku Faisal Fathani, Ph.D., IPU. (2); Prof. Dr. Ir. Subagyo Pramumijoyo, DEA., IPU. (3); Ir. Gayatri Indah Marliyani, S.T., M.Sc., Ph.D., IPM (4) |
| Abstrak/Abstract |
Background Accurate vs30 values are crucial for earthquake hazard assessment. The ongoing development of the vs30
Model aims to yield the most precise representation of field conditions. Geological characteristics such as elevation,
slope, and land development parameters are crucial. The Opak River area is located in the boundary of Young
Merapi Deposit Group and the Southern Mountains litological units. This area has a history of seismic activity, notably
the 2006 Yogyakarta earthquake.
Purpose The research aims to develop a vs30 model based on geological and topographic parameters.
Methods The vs30 reference data relies on vs30 microtremor data, validated through MASW, N-SPT, and seismic borehole
data. Validation vs30 microtremor data with MASW yields a correlation coefficient of 0.98, while the correlation
coefficient for the vs30 microtremor profile with N-SPT ranges from 0.68 to 0.98. Both vs30 microtremor and seismic
borehole data categorize sites similarly.
Results The vs30 model’s development employs multiple regression with topographic parameters (elevation, slope,
Terrain Ruggness Index and Topographic Position Index). The modeling process yields four vs30 equation models
with multiple regression coefficients ranging from 0.82 to 0.99.
Conclusion This model is expected to be applicable to seismic vulnerability models for earthquake preparedness
and civil engineering practices.
Keywords Topographic, Elevation, Slope, Terrain Ruggness Index (TRI) and Topographic Position Index (TPI) |
