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Sharma, Sangeeta
- Probabilistic Analysis of Seismic Data for Earthquake Forecast in North East India and its Vicinity
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Authors
Affiliations
1 Academy of Scientific and Innovative Research, and CSIR-North East Institute of Science and Technology, Jorhat 785 006, IN
2 CSIR-North East Institute of Science and Technology, Jorhat 785 006, IN
1 Academy of Scientific and Innovative Research, and CSIR-North East Institute of Science and Technology, Jorhat 785 006, IN
2 CSIR-North East Institute of Science and Technology, Jorhat 785 006, IN
Source
Current Science, Vol 117, No 7 (2019), Pagination: 1167-1173Abstract
Seismic data for 100 years (1918–2018) were analysed for probabilistic analysis in the forecast of probable future earthquakes above Mw ≥ 5.0 in North East India (20°–30°N and 86°–98°E) and its vicinity. The best distribution for seismic data allows probabilistic analysis to ascertain mean occurrence period E(t) for earthquakes of Mw ≥ 5.0. Here, Kolmogorov–Smirnov statistics has been utilized constrained by Weibull distribution to achieve the best fit on the dataset. E(t) is found to be 74 days approximately with 50% probability. Similarly, cumulative probability function indicates a time period of 140 days with 80% probability, while 400–500 days of recurrence time period is embedded with 90–100% probability for an earthquake of Mw ≥ 5.0 to recur following the occurrence of the last earthquake.Keywords
Cumulative Probability Function, Earthquake Forecast, Probabilistic Analysis, Seismic Risk.Full Text
References
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- Soil Organic Carbon Variation Under Sub-Tropical Forest of Himachal Pradesh, India
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Authors
Affiliations
1 School of Studies in Botany, Jiwaji University, Gwalior 474 011, IN
1 School of Studies in Botany, Jiwaji University, Gwalior 474 011, IN
Source
Current Science, Vol 122, No 1 (2022), Pagination: 56-60Abstract
It is important to estimate soil organic carbon (SOC) content of natural forests for an understanding of the Himalayan ecosystem. In this study SOC concentration was evaluated at three different soil depths (0–10, 10–20 and 20–30 cm) under Anogeissus latifolia (site I) and Pinus roxburghii (site II) forest stands in Himachal Pradesh, India. SOC (%) in these forests ranged from 0.37% to 2.20% up to 30 cm soil depth and was higher at site I compared to site II. Tree density was also more at site I than site II. The present study shows that the tree species can influence SOC of the forest ecosystem, but other environmental parameters such as soil type, moisture and pH are also responsible for changes in the soil carbon sequestration potential. Carbon sequestration in the study area showed significant contribution in minimizing the increase in carbon dioxide in the atmosphere and improving soil quality.Keywords
Anogeissus latifolia, Carbon Sequestration, Pinus roxburghii, Soil Organic Carbon, Sub-Tropical Forest.Full Text
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- Neotectonic evidences of some major rivers of North East India
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Authors
Affiliations
1 Geoscience Division, CSIR-North East Institute of Science and Technology, Jorhat 785 006, IN
2 Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, IN
1 Geoscience Division, CSIR-North East Institute of Science and Technology, Jorhat 785 006, IN
2 Department of Applied Geology, Dibrugarh University, Dibrugarh 786 004, IN
Source
Current Science, Vol 122, No 8 (2022), Pagination: 918-933Abstract
The neotectonic activity of some parts of the Assam–Arakan Basin in North East India has been studied through drainage patterns, anomalies and morphotectonics to determine the recent deformation in the area that serves as the input for any seismic hazard assessment. Various drainage anomalies like annular drainage pattern, compressed meanders, paleochannels, and knick points in the river courses reveal the presence of neotectonic activity in the area, which is also confirmed by topographic profiles and seismic sections. The present study reveals that active subsurface structures like the Rudrasagar High, Geleki Low, Geleki High and Jorhat Fault have direct influence on the development and modification of the river systems courses. The morphometric and morphotectonic studies of drainage basins flowing through the Belt of Schuppen and Dauki Fault show strong influence of tectonics. The tectonic activities of the Bomdila and Kopili Faults are studied through neotectonics and seismotectonics, supplemented by gravity data. Seismicity is fairly intense in both the areas and both faults have influences in modifying the drainage alignments of the region. Occurrence of bils/swamps and development of knicks, presence of tectonic scarps, disturbed and folding in beds on the river banks and intense seismic activity in the region reveal neotectonic activity.Keywords
Drainage anomalies, morphotectonics, neotectonic activity, seismotectonics, seismic hazard assessment.Full Text
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