Comparison of earthquake source characteristics in the Kachchh Rift Basin and Saurashtra horst, Deccan Volcanic Province, western India

Abstract

Seismic source parameters of small to moderate sized intraplate earthquakes that occurred during 2002-2009 in the tectonic blocks of Kachchh Rift Basin (KRB) and the Saurashtra Horst (SH), in the stable continental region of western peninsular India, are studied through spectral analysis of shear waves. The data of aftershock sequence of the 2001 Bhuj earthquake (M w 7.7) in the KRB and the 2007 Talala earthquake (M w 5.0) in the SH are used for this study. In the SH, the seismic moment (M o), corner frequency (f c), stress drop (Δσ) and source radius (r) vary from 7.8

A widely felt Tremor (ML3.5) of 12 April 2020 in and around NCT Delhi in the backdrop of prevailing COVID-19 pandemic lockdown: analysis and observations

“…The mean value of the source parameters of the recent earthquake, namely, the seismic moment, corner frequency, stress drop, and source radius, are estimated to be 1.15 Â 10 14 N-m, 5.7 Hz, 25.7 bars, and 300 m, respectively. The estimated result, therefore, is characterized $ 26.0 bars stress drop for the Delhi region, which is found to be within the stress drop range (10-144 bars) for stable-craton intraplate earthquakes (Kumar et al 2014, Sairam et al 2018. Further, the stress drop for the small to moderate earthquakes in the Central United States are found to be in the range of 46-300 bars, with a median of 84 bars (Huang et al 2017).…”

“…Further, the stress drop for the small to moderate earthquakes in the Central United States are found to be in the range of 46-300 bars, with a median of 84 bars (Huang et al 2017). It is to mention that in general, higher stress drops usually coincide with the intraplate region (Sairam et al 2018).…”

Source parameters and scaling relations for small to moderate earthquakes in theIndo‐BurmaRanges,North‐east India, and its seismotectonic implications

“…Various parameters define scaling relations, which in turn are interdependent. Some of these parameters include seismic moment, magnitude, stress drop, corner frequency, and source dislocation (Sairam, Singh, & Kumar, 2018). The theoretical basis for the scaling relations was developed by Kanamori and Anderson (1975).…”

GPS and InSAR derived evidences of intra‐basin stress and strike‐slip tectonics in the vicinity of 2001 (M7.7) earthquake, Kachchh, western India

“…In the present study, we have selected a transverse fault (Ekal Amrapar Fault; EAF) located between Khadir and Bela Island (Biswas & Deshpande, 1970) in the Rann. The fault is believed to be active at present and an earthquake of ≈ M5.2, (2006) has already been triggered and the fault plane solution indicates strike‐slip motion (Dumka, Kotlia, Kothyari, et al, 2018; Kothyari, Rastogi, et al, 2016; Sairam et al, 2018; Singh et al, 2016). Therefore, to visualize the associated deformation along EAF, we carried out InSAR study in the vicinity of Bela and Khadir Island (refer, Figure 1).…”