National Seismological Network in India for Real-Time Earthquake Monitoring

Bansal, B. K.; Pandey, Ajeet P.; Singh, A. P.; Suresh, G.; Singh, Ravi Kant; Gautam, J. L.

doi:10.1785/0220200327

Cited by 28 publications

(14 citation statements)

References 18 publications

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“…In our study, seismicity used from the International Seismological Centre (ISC) global catalogue collected for the periods of January 1964 to December 2018 for the domain 92°–97°E and 22°–27°N (ISC, 2018). We compared the focal parameters of the National Seismological Centre (NCS) with the global catalogue (Bansal et al, 2021). A comparison of earthquake locations estimated by the NCS with that of the global database, for moderate‐to‐large earthquakes in India and its region, an average difference in locations are found to be ∼0:02°.…”

Section: Data and Analysis Of Resultsmentioning

confidence: 99%

Distribution of b‐values in Indo‐Burma Ranges, northeast India: Implications to structural heterogeneities and style of faulting

Bora¹,

Borah

Singh

et al. 2021

Geological Journal

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The spatial distribution of the b‐value has been determined using a homogeneous earthquake catalogue from 1964 to 2018 to examine the characteristics of structural heterogeneities and their bearing on the style of faulting in the Indo‐Burma region of Northeastern India. The study region is associated with an uneven distribution of structural heterogeneities and demonstrates the mixed type of faulting, nature where the majority of earthquakes resulted mainly by thrust and strike‐slip fault. Our critical analysis demonstrates that the existence of two prominent zones is associated with high b‐values and low b‐values where the mixed type of faulting resulted in the genesis of seismicity in the study area. The high b‐values in the study area contain a large number of smaller earthquakes whilst the low b‐values comprise a smaller number of larger earthquakes distributed along with the Naga‐Disang Thrust, Kabaw Fault, and Sagaing fault systems. A close comparison between b‐values and different faulting styles reveals that the area containing a low b‐value suggests stronger seismogenic zones, where an accumulation of strain energy leads to the genesis of seismicity by thrust faulting with slight slip component whilst Indo‐Burma Ranges regions connected with b‐values (0.5–0.9) demonstrate strike‐slip to the normal mode of faulting, indicating relatively weak seismogenic zones where tensional forces are prevalent. The depth sections illustrate that lower b‐values for the upper part of the subducting slab correspond to more stress generated by tectonics compared to that of the lower part, and interestingly the deeper part of the subducting Indian slab is coupled with conspicuously very high‐b values, suggesting the weakening of the Indian subducting slab through dehydration.

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Section: Data and Analysis Of Resultsmentioning

confidence: 99%

Distribution of b‐values in Indo‐Burma Ranges, northeast India: Implications to structural heterogeneities and style of faulting

Bora¹,

Borah

Singh

et al. 2021

Geological Journal

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“…We use data records from 28 local and regional stations of the National seismological Network in India (Bansal et al, 2021) and a few stations from the neighbouring countries, namely, Myanmar and Bhutan (Table 1) for location and source parameter estimation of the earthquake events that occurred during June-August 2020 in Mizoram area. The estimated parameters have been used for computing the strong ground motion using the stochastic simulation (SS) technique.…”

Section: Data Source and Methodologymentioning

confidence: 99%

The 2020 earthquake sequence and seismic hazard scenario of Mizoram state in northeast India

2022

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The Mizoram state of India lies in close proximity to the active Indo-Burma subduction zone and had experienced several moderate to large earthquakes, including the M7 event in 1938. Since 2015, only two events with 5<M<6 have occurred in the area, however, a sudden enhancement of earthquake activity (M3.0–M5.7) was observed from June to August 2020 in the eastern part of the Mizoram state, including the four events of M ≥ 5.0. We analysed the waveform data of 21 events recorded by the local and regional BBS to estimate the source parameters. The focal depth of these events varies from 13 to 45 km, while other parameters such as corner frequency, source radius, stress drop, and scalar seismic moment of the events are found in the range of 0.45–3.36 Hz, 0.77–5.58 km, 1.3–193 bars, and 3.98107E+13 to 6.30957E+17 Nm, respectively. The seismicity pattern shows two distinct clusters along the well-demarcated faults in the region, and most of them are generated by strike-slip movements. The Churachandpur-Mao Fault (CMF) is found to be the most active tectonic element in the study area. Hence, an M8 event has been simulated on the same fault using the stochastic simulation technique. The technique was validated by simulating the three M+5 events on the same source zone and comparing the simulated PGA, frequency, and response spectrum with the observed data. The simulation reveals that a PGA ∼480 gals is expected near the fault zone. The easternmost districts of Mizoram, such as Champai, Serchhip, Lunglei, Saiha, and Aizawl, may experience severe PGA (250–450 gals). The response spectral acceleration corresponding to single-storey, double-storey, 3–4 storey, and 5–6 storey buildings has also been estimated in the present study and it is found to vary in the range of 1,400–200 gals. The result of the present study will be useful in various engineering applications and help reduce the loss of lives and damage to infrastructure due to future large events in the region.

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“…Details of station locations, date of installation, type of instrumentations, and site geology, etc. are available in the paper by Bansal et al (2021).…”

Section: Seismic Monitoringmentioning

confidence: 99%

On mitigation of earthquake and landslide hazards in the eastern Himalayan region

et al. 2022

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Mitigation of geological hazards through science and engineering applications is one of the most effective ways to reduce their impact on human life and local infrastructure. It involves precise mapping of hazards, assessment of their potential, monitoring, early warning, geotechnical treatment, design of vital infrastructural facilities and creating awareness at local levels. Several such initiatives have been taken at government level to deal with the earthquakes and landslides in the eastern Himalayan region. These efforts facilitated identification of potential areas and sites, susceptible to future events and helped in improving our understanding of crustal structure, geodynamics, tectonics, seismogenesis, and soil properties, etc. The paper highlights details of the major initiatives, significant achievements, and priorities to help in better mitigation of earthquake and landslide hazards in the eastern Himalayan region.

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National Seismological Network in India for Real-Time Earthquake Monitoring

Cited by 28 publications

References 18 publications

Distribution of b‐values in Indo‐Burma Ranges, northeast India: Implications to structural heterogeneities and style of faulting

Distribution of b‐values in Indo‐Burma Ranges, northeast India: Implications to structural heterogeneities and style of faulting

The 2020 earthquake sequence and seismic hazard scenario of Mizoram state in northeast India

On mitigation of earthquake and landslide hazards in the eastern Himalayan region

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