Borehole Seismic Network at Koyna, India

Shashidhar, D.; Satyanarayana, H. V. S.; Mahato, C. R.; Rao, N. Purnachandra; Gupta, Harsh K.

doi:10.1785/0220150210

Cited by 25 publications

(9 citation statements)

References 19 publications

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“…The high signal to noise ratio waveforms have the potential not only to detect the sub M1.0 seismic events but also can provide structural information with unprecedented resolution. The preliminary studies show that the absolute errors in locations of earthquake based on the borehole data ranges from 800 to 300m (Shashidhar et al, 2016).…”

Section: Reservoir Triggered Seismicity (Rts) -Koyna-warna Regionmentioning

confidence: 99%

“…Scientific deep drilling in the region has revealed that the Deccan trap has 932.5m thick and underlain by the basement rock (Roy et al, 2013). The major science objectives and feasibility were discussed with the international community through ICDP workshops (Gupta and Nayak, 2011;Shashidhar et al, 2016). The deployment of borehole seismic sensors is first of its kind in India.…”

Section: Reservoir Triggered Seismicity (Rts) -Koyna-warna Regionmentioning

confidence: 99%

“…Quite a number of works have been conducted to understand the fault disposition, rifting mechanism and subduction tectonics based on the seismicity disposition (Mukhopadhyay et al, 2010;Rajendran et al, 2011). Crustal structure has been presented using the ambient noise and converted wave technique in this region by Gupta, S., et al (2016). However, a detail crustal and lithospheric structures have been imaged , where the down-going of the Indian oceanic plate below the Andaman arc suffers deformation and lithospheric tearing possibly due to the dehydration of the slab (Mishra et al, 2011).…”

Section: Andaman-nicobar Islandsmentioning

confidence: 99%

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Recent Advancement In Studies Of Deccan Traps And Its Basement, Carbonatites And Kimberlites - An Indian Perspective In Last Five Years

Kumar¹

2018

Proceedings of the Indian National Science Academy

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Recent seismological researches in India can be broadly classified under a) seismogenesis and seismotectonics of Himalaya, Burmese-arc, Andaman-Nicobar subduction zone, the Stable Continental region, b) study of reservoir triggered seismicity, with specific emphasis on earthquakes in Koyna, c) earthquake precursory studies, d) study of tsunamigenic earthquakes and establishment of Indian Tsunami Early Warning System, e) studies on site response, microzonation, earthquake risk, vulnerability, disaster management and risk, and f) use and developments of new seismological methodologies to study the deeper structure of the Indian shield. On account of the increase in population density and urbanization, the loss of human lives and properties by earthquakes are expected to continue to rise. To develop an earthquake resilient society, it is desirable to undertake seismic hazard microzonation, implementation of early warning system and carryout earthquake drills in critical areas. Further, emphasis have been given on the detail seismolgoical investigations on oceanic plate in the Indian ocean and slow slip earthquakes in the Himalaya. The article reviews the history, accomplishments, status and challenging trends in seismological research and its applications. It further, shed light on the future directions and the growing needs for society.

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Section: Reservoir Triggered Seismicity (Rts) -Koyna-warna Regionmentioning

confidence: 99%

Section: Reservoir Triggered Seismicity (Rts) -Koyna-warna Regionmentioning

confidence: 99%

Section: Andaman-nicobar Islandsmentioning

confidence: 99%

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Recent Advancement In Studies Of Deccan Traps And Its Basement, Carbonatites And Kimberlites - An Indian Perspective In Last Five Years

Kumar¹

2018

Proceedings of the Indian National Science Academy

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“…For precise locations of the triggered events, a network of eight borehole seismometers are deployed at depths 1134-1522 m below the Deccan basalt cover along with the existing network of 21 broadband surface seismometers. The network is designed and operated by the National Geophysical Research Institute (NGRI), and the seismicity down to magnitude Mw 0.5 are monitored (Shashidhar et al, 2016). Recently, Gupta (2018) reviewed the findings of multi-geophysical and seismological investigations carried out during the last 50 years to understand common characteristics of the RTS events, role of reservoirs in triggering the earthquakes and their relation with water level changes.…”

Section: Triggered Earthquakesmentioning

confidence: 99%

Seismicity and structure of the Indian subcontin

Kayal

2020

Episodes

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Instrumentally recorded tectonic earthquakes The 1897 great Shillong plateau earthquake (M w 8.1) in NE India region is the first instrumentally recorded Indian earthquake that was registered outside India by a few global seismic stations. After this great event, the first Indian seismological observatory was established in Alipore (Kolkata) in 1899 under auspices of the India Meteorological Department (IMD) (Kayal, 2008). Since then the national seismological network is developed; today it consists of some 115 broadband seismic observatories including some cluster-networks in NE India and in different segments of the Himalayas. In addition to these, a cluster of some 21 broadband stations is in operation in Koyna-Warna region and a cluster of some 50 broadband and 50 strong-motion stations is in operation in Gujarat state under the auspices of the Institute of Seismological Research (ISR), a newly established Institute in 2006. With the upgraded national network, earthquakes down to magnitude M w 3.5 are fairly well located, and down to M w 2.0 by the cluster networks. Recently, the Ministry of Earth Sciences (MoES) established the National Centre for

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“…The Koyna-Warna region has been experiencing small-to-moderate reservoir-triggered earthquakes since 1961 (Table 1; Gupta et al 2016). Until today, the region has experienced 22 M ≥ 5 events including the mainshock of M6.3 (Fig.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous estimation of site response and source parameters of reservoir-triggered earthquakes using data from the borehole seismic network in the Koyna–Warna seismic zone, Maharashtra, India

Mandal¹,

Satayanarayana²,

Shashidhar³

et al. 2021

Nat Hazards

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The horizontal components of S-wave data from 25 events (M w 2.9-4.2) recorded at five borehole seismograph sites in the Koyna-Warna seismic zone, Maharashtra, India, were analysed to estimate the site response (SR) and source parameters. In the 0.2-1.8 Hz frequency band, the maximum SR value (~ 1.2) is modelled at FBH site, lying in the region west of Warna reservoir. In the 3-7 Hz frequency band, the average SR estimates suggest a maximum value of 1.6 at UBH site (near the Warna reservoir) and a minimum value of 0.8 at PBH site (showing localized de-amplification) on the eastern side of the Donachiwada fault. While at RBH site (near the Koyna reservoir), SR at 3-7 Hz shows a value of 1.3. At FBH site, average site response values at both frequency bands reveal higher values of 1.2-1.5, lying in the NNE-SSW trending Koyna seismic zone where the 1967 M w 6.3 Koyna earthquake took place. The modelled seismic moment (M o ) and source radius (r) of earthquakes are in between 3.0 × 10 13 and 2.5 × 10 15 N-m and 175 to 364 m, respectively, while stress drops (Δσ) vary from 1.9 to 34.2 MPa. The estimated relation M o f c 2.9 = 5.82 × 10 16 Nm/s 3 between the moment and corner frequency agrees well with the relation for other seismically active areas in the world. The modelled stress drops and seismic moment are found to satisfy the following relation: log 10 Δ (MPa) = 0.62 log 10 M o (N −m) − 8.03 . Our modelling suggests that most of the Koyna-Warna earthquakes (21 out of 25) follow the frictional overshoot rupture model while a few (4 out of 25) Koyna-Warna events satisfy the partial stress-drop rupture model.

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Borehole Seismic Network at Koyna, India

Cited by 25 publications

References 19 publications

Recent Advancement In Studies Of Deccan Traps And Its Basement, Carbonatites And Kimberlites - An Indian Perspective In Last Five Years

Recent Advancement In Studies Of Deccan Traps And Its Basement, Carbonatites And Kimberlites - An Indian Perspective In Last Five Years

Seismicity and structure of the Indian subcontin

Simultaneous estimation of site response and source parameters of reservoir-triggered earthquakes using data from the borehole seismic network in the Koyna–Warna seismic zone, Maharashtra, India

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