On frequency magnitude and energy of significant Indian earthquakes

Ram, Arun; Rathor, H. S.

doi:10.1007/bf00875475

Cited by 21 publications

(5 citation statements)

References 6 publications

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“…The b = 1.07 as computed by Dimri (1997) is much greater than our findings for 1964-1993 and 1993-1995, 0.82 and 0.845, respectively, but these values are much higher than the value 0.47 observed for Peninsular India (Gupta et al 1969). Except for the b-value 1.286 of 1996-1997 data, our findings are in agreement with the previous studies of bvalue in this area as suggested by various authors; Ram and Singh (1971), Ram and Rathor (1970), Gupta et al (1969), and Gupta and Arora (2000). For 1996-1997 data, the bvalue 1.286 shows an increase.…”

Section: Resultssupporting

confidence: 93%

Theb-value and fractal dimension of local seismicity around Koyna Dam (India)

Kumar

Joshi

et al. 2013

Earthq Sci

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Earthquakes began to occur in Koyna region (India) soon after the filling of Koyna Dam in 1962. In the present study, three datasets 1964-1993, 1993-1995, and 1996-1997 are analyzed to study the b-value and fractal dimension. The b-value is calculated using the Gutenberg-Richter relationship and fractal dimension D corr. using correlation integral method. The estimated b-value and D corr. of this region before 1993 are found to be in good agreement with previously reported studies. In the subsequent years after 1995, the b-value shows an increase. The estimated b-values of this region are found within the limits of global average. Also, the pattern of spatial clustering of earthquakes show increase in clustering and migration along the three zones called NorthEast Zone, SouthEast Zone (SEZ), and Warna Seismic Zone. The earthquake events having depth B5 km are largely confined to SEZ. After 1993, the D corr. shows decrease, implying that earthquake activity gets clustered. This seismic clustering could be helpful for earthquake forecasting.

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Section: Resultssupporting

confidence: 93%

Theb-value and fractal dimension of local seismicity around Koyna Dam (India)

Kumar

Joshi

et al. 2013

Earthq Sci

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“…From the analysis it was observed that, seismic parameter for the region with a 'b' value of 0.87 ± 0.03, which matches well with the 'b' estimated using Gutenberg-Richter relation. The 'b' value obtained in this study matches well with the previous studies of Ram and Rathor (1970), Kaila et al (1972), Ramalingeswara Rao and Sitapathi Rao (1984) and Jaiswal and Sinha (2006) for southern India. Table 2 presents the 'b' value presented by different authors for southern India along with the values obtained in the present study.…”

Section: Seismic Hazard Parameter 'B'supporting

confidence: 93%

Probabilistic seismic hazard analysis for Bangalore

2008

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This article presents the results of probabilistic seismic hazard analysis (PSHA) for Bangalore, South India. Analyses have been carried out considering the seismotectonic parameters of the region covering a radius of 350 km keeping Bangalore as the center. Seismic hazard parameter 'b' has been evaluated considering the available earthquake data using (1) Gutenberg-Richter (G-R) relationship and (2) Sellevoll (1989, 1992) method utilizing extreme and complete catalogs. The 'b' parameter was estimated to be 0.62 to 0.98 from G-R relation and 0.87 ± 0.03 from Kijko and Sellevoll method. The results obtained are a little higher than the 'b' values published earlier for southern India. Further, probabilistic seismic hazard analysis for Bangalore region has been carried out considering six seismogenic sources. From the analysis, mean annual rate of exceedance and cumulative probability hazard curve for peak ground acceleration (PGA) and spectral acceleration (Sa) have been generated. The quantified hazard values in terms of the rock level peak ground acceleration (PGA) are mapped for 10% probability of exceedance in 50 years on a grid size of 0.5 km 9 0.5 km. In addition, Uniform Hazard Response Spectrum (UHRS) at rock level is also developed for the 5% damping corresponding to 10% probability of exceedance in 50 years. The peak ground acceleration (PGA) value of 0.121 g obtained from the present investigation is slightly lower (but comparable) than the PGA values obtained from the deterministic seismic hazard analysis (DSHA) for the same area. However, the PGA value obtained in the current investigation is higher than PGA values reported in the global seismic hazard assessment program (GSHAP) maps of Bhatia et al. (1999) for the shield area.

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“…The "b" value obtained for the study area matches well with the previous studies of Ram and Rathor (1970), Kaila et al (1972), Ramalingeswara Rao and Sitapathi Rao (1984), Anbazhagan et al (2009) and Sinha (2006, 2007).…”

Section: Regional Recurrence Relationsupporting

confidence: 79%

Estimation of peak ground acceleration and spectral acceleration for South India with local site effects: probabilistic approach

Vipin

Anbazhagan

Sitharam

2009

Nat. Hazards Earth Syst. Sci.

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Abstract. In this work an attempt has been made to evaluate the seismic hazard of South India (8.0 • N-20 • N; 72 • E-88 • E) based on the probabilistic seismic hazard analysis (PSHA). The earthquake data obtained from different sources were declustered to remove the dependent events. A total of 598 earthquakes of moment magnitude 4 and above were obtained from the study area after declustering, and were considered for further hazard analysis. The seismotectonic map of the study area was prepared by considering the faults, lineaments and the shear zones in the study area which are associated with earthquakes of magnitude 4 and above. For assessing the seismic hazard, the study area was divided into small grids of size 0.1 • ×0.1 • , and the hazard parameters were calculated at the centre of each of these grid cells by considering all the seismic sources with in a radius of 300 km. Rock level peak horizontal acceleration (PHA) and spectral acceleration (SA) values at 1 s corresponding to 10% and 2% probability of exceedance in 50 years have been calculated for all the grid points. The contour maps showing the spatial variation of these values are presented here. Uniform hazard response spectrum (UHRS) at rock level for 5% damping and 10% and 2% probability of exceedance in 50 years were also developed for all the grid points. The peak ground acceleration (PGA) at surface level was calculated for the entire South India for four different site classes. These values can be used to find the PGA values at any site in South India based on site class at that location. Thus, this method can be viewed as a simplified method to evaluate the PGA values at any site in the study area.

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On frequency magnitude and energy of significant Indian earthquakes

Cited by 21 publications

References 6 publications

Theb-value and fractal dimension of local seismicity around Koyna Dam (India)

Theb-value and fractal dimension of local seismicity around Koyna Dam (India)

Probabilistic seismic hazard analysis for Bangalore

Estimation of peak ground acceleration and spectral acceleration for South India with local site effects: probabilistic approach

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