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Paul, Ajay
- Estimation of Site Amplification at Various Litho-Units in NW-Himalaya Using Horizontal to Vertical Ratio
Abstract Views :171 |
PDF Views:2
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehra Dun - 248 001, IN
2 Kumaun University, Nainital - 263 002, IN
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehra Dun - 248 001, IN
2 Kumaun University, Nainital - 263 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 4 (2007), Pagination: 605-609Abstract
This note is a result of an off-shoot study carried out of a reconnaissance Seismic noise survey to establish broadband seismological stations. The survey was conducted in Kumaun Himalaya for the purpose of characterizing background seismic noise characteristics. This paper deals with the estimation of local site effects at various locations with varying geological and tectonic environments in the region. The effects of the various litho units on the site's predominant frequency are depicted here it is seen that the character of the top sedimentary column and its compaction plays a vital role in the estimation of site response. The level of tectonic complexity is also reflected in the noise spectra of the studied regions. The region in close proximity of the MCT zone exhibits high background seismic noise level.Keywords
Seismic Noise, Site Amplification, Lithological Effect, Kumaun Himalaya.- Recent Trends in Seismicity of Uttaranchal
Abstract Views :180 |
PDF Views:2
Authors
Charu C. Pant
1,
Ajay Paul
1
Affiliations
1 Department of Geology, Kumaun University, Nainital - 263 002, IN
1 Department of Geology, Kumaun University, Nainital - 263 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 4 (2007), Pagination: 619-626Abstract
The seismic network in Kumaun Himalaya has recorded nearly three thousand earthquakes events since April 1999. The data has been analysed to study the seismicity pattern, seismicity rate, stress drop and focal depth pattern. The detailed analyses of 388 events have been carried out. The magnitude of the events is less than 4.2, the focal depth for most of the events lie between 10-25 km and the stress drop values are low. An attempt has been made to delineate seismically active zones and the seismicity pattern indicates that the strain energy is being released along NW-SE direction almost parallel to the regional thrust viz. Main Central Thrust/Munsiari Thrust/Berinag Thrust/North Almora Thrust and orthogonally along N-S/NNW-SSE directions. Considering the fact that the strain energy is continuously building up along the Himalayan front due to convergence of Indian and Eurasian Plates and the region lying between Bihar-Nepal border (1934 earthquake MS 8.4) and Kangra (1905, earthquake MS 8.6) has not experienced a major earthquake (M ≥8). The evaluated low value of seismicity rate and stress drop in the Kumaun Himalaya may be indicative of possible major earthquake in near future.Keywords
Seismotectonics, Stress Drop, Seismicity, Uttaranchal Himalaya.- Seismic Hazard Estimation in Northeastern Kumaun Himalayas
Abstract Views :178 |
PDF Views:150
Authors
Ajay Paul
1,
P. D. Pant
1
Affiliations
1 Department of Geology, Kumaun University, Nainital - 263 002, IN
1 Department of Geology, Kumaun University, Nainital - 263 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 4 (2003), Pagination: 477-482Abstract
No Abstract.- Evaluation and Implications of Seismic Events in Garhwal-Kumaun Region of Himalaya
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 4 (2010), Pagination: 414-418Abstract
The Garhwal-Kumaun region continues to accumulate the built-up of strain energy like the other regions of the Himalaya. But this sector unlike the other sectors is yet to release this accumulated strain energy which can be in the form of great earthquake. The region has sufficient strain energy to generate earthquake of M>8. The analysis of seven hundred ten local events recorded by ten station broad band network between August'07 to February'10 shows that most of the seismic events recorded in this region continue to occur from shallow depths (< 25 km). The evaluation of source parameters from p-wave spectral analysis indicates that the events have low stress drop values. The region continues to release energy in the form of smaller magnitude earthquakes. The epicentral location map indicates that Munsiari Thrust, which is located south of the Main Central Thrust is more active.Keywords
Seismicity, Strain Energy, Earthquake, Garhwal-Kumaun, Himalaya.- Spatial Distribution pf Landslides Vis-à-Vis Epicentral Distribution of Earthquakes in The Vicinity of The Main Central Thrust Zone, Uttarakhand Himalaya, India
Abstract Views :156 |
PDF Views:81
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
Source
Current Science, Vol 120, No 12 (2021), Pagination: 1927-1932Abstract
Landslides and related mass movement activities along with earthquakes are common in the Himalayan terrain. The distribution of seismic activities in the vicinity of the Main Central Thrust (MCT) is well known. However, in order to assess the relationship between these seismic events and landslides, the spatial distribution of landslides and earthquake events (magnitude >1.5) on either side of the MCT zone was evaluated. It has been observed that seismic events of magnitude <2.1 are clustered around the 1991 Uttarkashi earthquake rupture, 1999 Chamoli earthquake rupture and around Munsiyari. The zone surrounding 1999 Chamoli earthquake rupture indicates the highest earthquake and landslide density of ∼75% and 53% respectively.Keywords
No Keywords.References
- Gupta, V., Bhasin, R. K., Kaynia, A. M., Tandon, R. S. and Venkateshwarlu. B., Landslide Hazard in the Nainital township, Kumaun Himalaya, India – the case of Sept 2014 Balia Nala landslide. Nat. Haz., 2016, 80(2), 863–877.
- Gupta, V., Tandon, R. S., Venkateshwarlu, B., Bhasin, R. K. and Kaynia, A. M., Accelerated mass movement activities due to increased rainfall in the Nainital township, Kumaun Lesser Himalaya, India. Zeit. Geomorph., 2017, 61(1), 29–42.
- Kumar, V., Gupta, V. and Sundriyal, Y. P., Spatial interrelationship of landslides, litho-tectonic, and climate regime, Satluj valley, Northwest Himalaya. Geol. J., 2019, 54(1), 537–551.
- Jamir, I., Gupta, V., Thong, G. T. and Kumar, V., Litho-tectonic and precipitation implications on landslides, Yamuna valley, NW Himalaya. Phys. Geogr., 2020, 41(4), 365–388.
- Owen, L. A., Kamp, U., Khattak, G. A., Harp, E. L., Keefer, D. K. and Bauer, M. A., Landslides triggered by the 8 October 2005 Kashmir earthquake. Geomorph., 2008, 94, 1–9.
- Gupta, V., Mahajan, A. K. and Thakur, V. C., A study on landslides triggered during Sikkim Earthquake of September 18, 2011. Him. Geol., 2015, 36(1), 81–90.
- Martha, T. R., Babu Govindharaj, K. and Kumar, V. K., Damage and geological assessment of the 18 September 2011 Mw 6.9 earthquake in Sikkim, India using very high resolution satellite data. Geosci. Front., 2015, 6, 793–805.
- Keefer, D. K., Landslides caused by earthquakes. Geol. Soc. Am. Bull., 1984, 95(4), 406–421.
- Cotton, F., Campillo, M., Deschamps, A. and Rastogi, B. K., Rupture history and seismotectonics of the 1991 Uttarkashi, Himalaya Earthquake. Tectonophysics, 1996, 258, 35–51.
- Mandal, P., Rastogi, B. K. and Gupta, H. K., Recent Indian Earthquakes. Curr. Sci., 2000, 79, 1334–1346.
- Sarkar, I., Pachauri, A. K. and Israil, M., On the damage caused by the Chamoli earthquake of 29 March 1999. J. Asian Earth Sci., 2001, 19(1–2), 129–134.
- Paul, A. and Singh, R., Relevance of seismicity in KumaunGarhwal Himalaya in context of recent 25th April 2015 Mw 7.8 Nepal earthquake. J. Asian Earth Sci., 2017, 144, 253–258.
- Prasath, A., Paul, A. and Singh, S., Upper crustal stress and seismotectonics of the Garhwal Himalaya using small-to-moderate earthquakes: Implications to the local structures and free fluids. J. Asian Earth Sci., 2017, 135, 198–211.
- Negi, S. S., Paul, A., Cesca, S., Kamal, Kriegerowski, M., Mahesh, P. and Gupta, S., Crustal velocity structure and earthquake processes of Garhwal-Kumaun Himalaya: constraints from regional waveform inversion and array beam modelling. Tectonophysics, 2017, 712–713, 45–63.
- Prasath, A., Paul, A. and Singh, S., Earthquakes in the Garhwal Himalaya of the Central Seismic Gap: a study of historical and present seismicity and their implications to the seismotectonics. Pure Appl. Geophys., 2019, 176, 4661–4685.
- Tandon, R. S. and Gupta, V., Estimation of strength characteristics of different Himalayan rocks from Schmidt hammer rebound, point load index and compressional wave velocity. Bull. Eng. Geol. Environ., 2015, 74(2), 521–533.
- Purohit, K. K., Islam, R. and Thakur, V. C., Metamorphism of Psammo-pelitic rocks of Bhagirathi valley, Garhwal Himalaya. J. Him. Geol., 1990, 1, 167–174.
- Petley, D., Global patterns of loss of life from landslides. Geology, 2012, 40(10), 927–930.
- Owen, L. A., Sharma, M. C. and Bigwood, R., Landscape modification and geomorphological consequences of the 20th October 1991 earthquake and the July–August 1992 monsoon in the Garhwal Himalaya. Z. Geomorph. N.F., 1996, 103, 359–372.
- Negi, S. S. and Paul, A., Space time clustering properties of seismicity in the Garhwal-Kumaun Himalaya, India. Him. Geol., 2015, 36(1), 91–101.
- Rawat, G., Arora, B. R. and Gupta, P. K., Electrical resistivity cross-section across the Garhwal Himalaya: proxy to fluidseismicity linkage. Tectonophysics, 2014, 637, 68–79.
- Barnard, P. L., Owen, L. A., Sharma, M. C. and Finkel, R. C., Natural and human-induced landsliding in the Garhwal Himalaya of northern India. Geomorph., 2001, (1–2), 21–35.
- Talukdar, R., Kothyari, G. C. and Pant, C. C., Evaluation of neotectonic variability along major Himalayan thrusts within the Kali River basin using geomorphic markers, Central Kumaun Himalaya, India. Geol. J., 2020, 55(1), 821–844.