08-10-2014, 04:36 PM
Himalayan region in India is one of the most seismically active regions in the world. About 120 recordings from Strong Motion Accelerographs (SMAS) are now available from the recent Himalayan earthquakes in the magnitude (M range of 5.2 to 7.3 with the epicentral distances ® ranging from 3 to 350kms. About 260 records from Structural Response Recorders (SRRs) from 5 Himalayan earthquakes are also available (M. 5.5-7.3; R: 4- 770kms). SRRs record spectral acceleration at natural periods of 0.4sec, 0.75sec and 1.25sec, for damping ratios of 5% and 10% of critical. The strong motion database available for Indian earthquakes can be enhanced by making use of records from SRRs. The compatibility of responses from SRRs and SMAs from Indian earthquakes has been studied and the peak ground acceleration has been estimated from SRRs recordings. The estimates of peak ground acceleration from SRRs are in line with those from SMAs. The peak ground accelerations in Indian earthquakes are compared with those predicted by the existing attenuation relationships. It is seen that the rel