Long-term seismic observations along Myanmar–Sunda subduction margin: insights for 2004 Mw &gt; 9.0 earthquake

Khan, Prosanta Kumar; Banerjee, Jayashree; Shamim, Sk; Mohanty, Manoranjan

doi:10.1007/s00531-018-1603-0

Cited by 2 publications

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“…The persistent moderate (∼1.0) to low b-values (∼0.8-0.76) in all the Zones X,Y and Z, and blocks A and B (Table 1; Figure 6B) invariably account for higher stress accumulation in the entire study-area (cf. Tormann et al, 2012;Spada et al, 2013;Khan et al, 2018). The low b-values, over time and space domains, usually indicate high-strength homogeneous rock-mass, whereas high b-values are found for a large number of small earthquakes expected in regions of low strength and large heterogeneity (Tsapanos, 1990).…”

Section: Resultsmentioning

confidence: 99%

“…Scholz (1968) and Wyss (1973) suggested the low b-values to be compatible with release of higher seismic moment energy in an active seismic zone. Scholz (1968) also suggested that the b-value decreases with increasing differential crustal stress (Schorlemmer et al, 2005;Spada et al, 2013;Scholz, 2015;Khan et al, 2018), and the declining b-value accounts for an impending main shock. The increased number of events in 2019-20 (block B, Figure 5A) and an overall moderate-to-low b-value indicate the possibility of increasing stress accumulation in the study area and a future great earthquake.…”

Section: Resultsmentioning

confidence: 99%

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Earthquake Shocks Around Delhi-NCR and the Adjoining Himalayan Front: A Seismotectonic Perspective

et al. 2021

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An increase in the number of earthquakes and subsequent clustering in northwest India, particularly around the Delhi-National Capital Region (NCR) and adjacent NW Himalayan front, provides a good opportunity to understand the underpinning tectonic controls and the likelihood of any large earthquake in the future. The 2001 Mw 7.7 Bhuj, 2011 Mw 6.9 Sikkim and 2015 Mw 7.8 and 7.3 Nepal earthquakes (and 2004 Mw 9.2 Sumatra event) are important in this context. We analyzed the seismicity around the Delhi-NCR and the adjoining Himalayan front, including event clustering and the spatio-temporal distribution of b-values, in the context of kinematics and the regional geodynamics. The overall moderate-to-low b-values, both in time and space, since 2016, provide information regarding an increase and subsequent stabilization of the stress field in the study area. The analysis led to the identification of (1) a structurally guided stress field in the region between the Kachchh and the NW Himalaya that coincides with the direction of Indian plate convergence and (2) frequent occurrences of earthquakes particularly in the Delhi, Kangra and Uttarkashi areas. We propose that faults in western Peninsular India, which pass through the margins of the Aravalli Range, the Marwar basin, and the isostatically over-compensated Indo-Gangetic Plains beneath the under-plated Indian lithosphere, act as stress guides; concentrating and increasing stress in regions of lithospheric flexure. This enhanced stress may trigger a large earthquake.

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