Frequency magnitude distribution and spatial correlation dimension of earthquakes in north-east Himalaya and adjacent regions

The north-east sector of the Himalaya is one of the most active tectonic belts, with complex geological and tectonic features. The b-value and spatial correlation dimension (D ) of earthquake distribution in the north-east Himalaya and its adjacent regions (20–32°N and 88–98°E) are estimated in the...

Full description

Saved in:
Bibliographic Details
Published in:Geologos 2022-08, Vol.28 (2), p.115-128
Main Authors: Tiwari, Ram Krishna, Paudyal, Harihar
Format: Article
Language:English
Subjects:
b-value
Belts
Catalogues
Computation
Correlation
correlation dimension
Dimensions
Disaster management
Distribution
Earthquakes
Frequency dependence
Heterogeneity
Maximum likelihood estimation
North-east India
Regions
Seismic activity
Seismicity
Seismology
Tectonics
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The north-east sector of the Himalaya is one of the most active tectonic belts, with complex geological and tectonic features. The b-value and spatial correlation dimension (D ) of earthquake distribution in the north-east Himalaya and its adjacent regions (20–32°N and 88–98°E) are estimated in the present study. Based on seismicity and faulting pattern, the region is divided into five active regions, namely the (i) South-Tibet, (ii) Eastern-Syntaxis, (iii) Himalayan-Frontal Arc, (iv) Arakan-Yoma belt and (v) Shillong-Plateau. A homogeneous catalogue of 1,416 earthquakes (mb ≥ 4.5) has been prepared from a revised catalogue of the ISC (International Seismological Centre). The b-value has been appraised by the maximum likelihood estimation method, while D values have been calculated by the correlation integral method; b-values of 1.08 ± 0.09, 1.13 ± 0.05, 0.92 ± 0.05, 1.00 ± 0.03 and 0.98 ± 0.08 have been computed for the South-Tibet, Eastern-Syntaxis, Himalayan-Frontal Arc, Arakan-Yoma belt and Shillong-Plateau region, respectively. The D values computed for the respective regions are 1.36 ± 0.02, 1.74 ± 0.04, 1.57 ± 0.01, 1.8 ± 0.01, and 1.83 ± 0.02. These values are > 1.5, except for the South-Tibet (1.36 ± 0.02). The b-values around the global average value (1.0) reflect the stress level and seismic activity of the regions, while high D values refer to the heterogeneity of the seismogenic sources.
ISSN:2080-6574
1426-8981
2080-6574
DOI:10.2478/logos-2022-0009