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

• Autorzy: Tiwari Ram Krishna , Paudyal Harihar

Identyfikatory

DOI

10.2478/logos-2022-0009

• Języki publikacji: EN

Abstrakty

EN

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 (Dc) 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 Dc values have been calculated by the correlation integral meth-od; 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 Dc 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 Dc values refer to the heterogeneity of the seismogenic sources.

Słowa kluczowe

EN

north-east India; b value; maximum likelihood estimation; correlation dimension

PL

Indie północno-wschodnie; parametr b; największa wiarygodność; estymacja; wymiar korelacyjny

• Wydawca: Uniwersytet im. Adama Mickiewicza. Instytut Geologii
• Czasopismo: Geologos
• Rocznik: 2022
• Tom: Vol. 28, No. 2
• Strony: 115--128
• Opis fizyczny: Bibliogr. 83 poz.

Twórcy

autor

Tiwari Ram Krishna

• Central Department of Physics, Tribhuvan University, Kirtipur, Kathmandu, Nepal

autor

Paudyal Harihar

• Birendra Multiple Campus, Tribhuvan University, Bharatpur, Chitwan, Nepal

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).