Estimation of Source Parameters of Local Earthquakes Originated in Shillong–Mikir Plateau and its Adjoining Region of Northeastern India

Scaling relations of moment magnitude, local magnitude, and duration magnitude for earthquakes originated in northeast India

“…6 and 7) is similar to Hanks and Kanamori relation (1979); M L is the local magnitude estimated from the relation Sitaram and Bora (2007) * is the M L estimated from IMD, Shillong observatory Archuleta et al 1982;Bakun and Lindh 1977;Bindi et al 2001;Bora et al 2013;De Luca et al 2000;Dutta et al 2003;Fletcher et al 1984;Radulain et al 2014;Castello et al 2007). Thus, the slope value of 1.46 and 1.39 falls within the values previously obtained by other authors: *1.1 (e.g., Bindi et al 2001;De Luca et al 2000;Fletcher et al 1984) and *2.5 (e.g., Bakun and Lindh 1977;Bora et al 2013;Dutta et al 2003;Radulain et al 2014;Castello et al 2007). Also the relationship between M W versus M L and M D has been examined for the studied region of NE India.…”

“…The time windows were tapered with a 10 % cosine taper at the beginning and end of the series to minimize the spectral energy leakage. Moreover, to avoid near-field effects and to fulfill the point-source approximation, only the stations having epicentral distances greater than 10 km were taken into account (Bora et al 2013).…”

“…The Assam valley is an ENE-WSW trending narrow valley, which lies between Shillong plateau and the eastern Himalayan tectonic domains. Recent seismicity and tectonics of the region have been reviewed by Kayal et al (2008Kayal et al ( , 2012, Baruah et al (2011), and Bora and Baruah (2012), Bora et al (2013); Bora et al (2014). Prominent geological units of the northeastern region of India, however, remain geophysically less studied due to inaccessibility of the terrain.…”

Seismicity Parameters Analysis In Space-Time Distribution For Northeast India.

“…Resulting, the seismicity level of this study region has been increased in recent decades and vulnerable to hazard in this region. To minimize the hazard level of this study region numerous studies have been done by several authors such as (Angelier and Baruah, 2009;Kayal et al, 2006; Baruah et al, 2013;Bora et al, 2013) based on seismicity and seismotectonic analysis. Thus, the seismicity parameters study can help to reveal some aspects to minimize the seismic activity rate and vulnerability in any complex study region (Jafari, 2013).…”

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

“…Upadhyay and Ahuja (1981) calculated the source parameters of selected earthquakes in NE India using Rayleigh waves. Furthermore, Bora, Baruah, Biswas, and Gogoi (2013) focused on source parameters and scaling relation in the Shillong-Mikir Plateau of the NE region.…”