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Raghukanth, S. T. G.
- Estimation of Strong Ground Motion in Southern Peninsular India by Empirical Green's Function Method
Authors
1 CSIR-National Geophysical Research Institute, Hyderabad 500 007, IN
2 School of Engineering, Indian Institute of Technology-Mandi, Kamand 175 005, IN
3 Department of Civil Engineering, Indian Institute of Technology-Madras, Chennai 600 036, IN
Source
Current Science, Vol 112, No 11 (2017), Pagination: 2273-2283Abstract
In the present study, strong motions are estimated at 17 stations in Southern Peninsular India (SPI) for the 7 February 1900 Coimbatore earthquake (Mw 6) using the empirical Green's function (EGF) method. The broadband recordings of three small earthquakes of ML 3.5, 2.9 and 3.0 respectively, are taken as EGFs to simulate ground motion. The slip distribution of the main event is considered as a von Karman random field. The stress drops of the three small events estimated from finite fault stochastic seismological model lie between 130 and 140 bars. The peak ground acceleration (PGA) values, an ensemble of acceleration time histories and response spectra, are estimated at all the 17 stations using corresponding EGFs, and the mean response spectra are reported. Another estimate of PGA is also obtained using the stochastic seismological model. The estimated PGA values from the two methods are compared to check the consistency of the results. It is observed that the mean PGA values are within the bounds of the maximum and minimum PGA values obtained from the EGF method, while the differences at some stations can be attributed to the local site conditions.
The ground motions simulated in the present study can be used to perform nonlinear dynamic analysis for future and existing structures in the SPI region for any event of magnitude Mw 6.
Keywords
Empirical Green’s Function, Ground Motion, Peak Ground Acceleration, Response Spectra, Stochastic Finite Fault Model.References
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- Ground Motion Simulation for Earthquakes in Sumatran Region
Authors
1 Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN
Source
Current Science, Vol 114, No 08 (2018), Pagination: 1709-1720Abstract
The present study aims at developing a model for simulating ground motion for earthquakes in the Sumatran region where one of the most devastating earthquakes took place in 2004 with a moment magnitude (Mw) of 9.1. With advancements in instrumentation, the three-dimensional material properties, topography and bathymetry of the region are available in the global database. These parameters are used as inputs in Spectral Finite Element Method to simulate ground motions. The model is first validated with the IGCAR broadband velocity data for 2012 Mw 8.6 Sumatra Earthquake. Due to favourable comparison, our model is also used to generate ground displacement characteristics of Mw 9.1 event. The source uncertainties are accounted by using three finite fault slip models available in the global database. The simulated time histories showed that the ground motion is sensitive to input slip models. The peak ground displacement (PGD) and ground residual displacement (GRD) in both horizontal and vertical directions are presented as contour plots. PGD obtained from various slip models in the epicentral region is of the order of 14–22 m in horizontal direction and 7–16 m in vertical direction. GRD in the epicentral region is of the order of 6–17 m in East–West (E–W) 4–17 m in the North–South (N–S) directions. The vertical uplift obtained from various slip models is around 2–8 m. The developed model can be used to simulate ground motion time histories, which can be further used in hazard analysis, tsunami simulations, etc.Keywords
Ground Motion Time History, Ground Residual Displacement, Peak Ground Displacement, Sunda Arc.References
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Authors
1 Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN