A data set of 60 local events (1.9 ≤ Mw ≤ 3.6) collected by a temporary digital network deployed in the Siang region of Arunachal Lesser Himalaya during July 2011 to Feburary 2012 is analysed to study the source parameters and fmax. The software EQK_SRC_PARA (Kumar et al. in Int J Geosci 3(5):1142–1149, 2012) that considers Brune’s model with a high-frequency diminution factor (Boore in Bull Seismol Soc Am 73:1865–1894, 1983) has been used to estimate the spectral parameters namely: low-frequency displacement spectral level (Ω0), corner frequency (fc) and fmax. These obtained spectral parameters are used to estimate source parameters, namely: seismic moment, source dimension and stress drop and to study the characteristics of fmax in this region. Seismic moment varies from 6.13 × 1018 dyn-cm to 3.15 × 1021 dyn-cm; the source radii vary from about 175 to 357 m. The stress drops of these events vary from 0.2 to 56 bars and shows general increasing trend with increase in seismic moment. Various plots of both fc and fmax with seismic moment, focal depth, epicentral distance and site showed the same amount of scatters and trends. From this study, it is found that fmax has similar behavior as fc to seismic moment showing that it is also due to source process, and the same amount of scatter in both cut-off frequencies may be due to either source complexities or site effects or both. Both fc and fmax seems independent of epicentral distance and focal depth. Relationships between fmax and seismic moment and stress drop are obtained.
All Science Journal Classification (ASJC) codes
- Environmental Science(all)
- Earth and Planetary Sciences(all)