Quantifying Regional Body Wave Attenuation in a Seismic Prone Zone of Northeast India

Abstract

We evaluated the body wave attenuation parameter in Kopili

Regional variation of coda Q in Kopili fault zone of northeast India and its implications

“…The data of geothermal structure for the crust and mantle indicate that the heat flow for the region is as high as 51-70 mW/m 2 (data from International Heat Flow Commission). As reported by [40], that the distribution of earthquake depths throughout this region is consistent with a generic global view of seismicity in which earthquakes occur in (1) 'wet' upper crustal material to a temperature of ∼350 0 C, or (2) higher temperatures in dry granulite-facies lower crust or (3) mantle that is colder than ∼600 0 C. The physical mechanism that Q0 usually exhibits low values in the tectonically active regions still needs more in-depth analysis.…”

“…Very recently [22] cited about the role of Kopili fault in the recent Imphal earthquake. Furthermore, [1] estimates the body wave attenuation mechanism for this study area using direct P and S-wave. On the other hand, [23] investigated the coda wave attenuation mechanism and opinioned that there was some velocity anomaly underneath this region.…”

Regional variation of coda Q in Northwest Caucasus

“…The use of this value is important for comparison with the results of studies in other regions of the world which use the same value. Another geometrical spreading value was 𝛽 = 1.0 was chosen for body waves, which is usually used in other studies (Ibanez et al 1990;Dasovic et al 2013;Bora et al 2017;Giampiccolo et al 2018;Blanke et al 2019;Demirci 2019 and many others). And as is shown by Pavlenko (2008Pavlenko ( , 2016, for the study territory of the Western Caucasus, for distances less than 70 km, it is optimal to use geometrical spreading 𝛽 = 1.0.…”

A brief review of the recent Assam Earthquake

“…Above all, Assam remained witness to great earthquake of magnitude 8.6 in the year 1950 which resulted in huge casualties. It is pertinent to mention here that Indian tectonic plate is continuously wedging into the Eurasian plates at a speed of 44 mm/year which is a large contributor of strain build-up [2][3][4][5][6][7][8][9][10].…”