Estimation of present-day inter-seismic deformation in Kopili fault zone of north-east India using GPS measurements

Barman, Prakash; Ray, J.; Kumar, Ashok; Chowdhury, Jyotirmoy Das; Mahanta, Kahsyap

doi:10.1080/19475705.2014.983187

Cited by 22 publications

(13 citation statements)

References 20 publications

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“…6), would actually result in an M W of 8.4. Evidence for past megathrust ruptures in the Bhutan Himalaya have been provided by other recent studies (e.g., Berthet et al, 2014;Le Roux-Mallouf et al, 2016;Hetényi et al, 2016a) and similar structural segmentation is suggested from gravity anomalies (Hetényi et al, 2016b).…”

Section: Crustal Structure and Mht In Bhutansupporting

confidence: 64%

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Seismotectonics of Bhutan: Evidence for segmentation of the Eastern Himalayas and link to foreland deformation

Diehl

Singer

Hetényi

et al. 2017

Earth and Planetary Science Letters

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The instrumental record of Bhutan is characterized by a lower seismicity compared to other parts of the Himalayan arc. To understand this low activity and its impact on the seismic hazard, a seismic network was installed in Bhutan for 22 months between 2013 and 2014. Recorded seismicity, earthquake moment tensors and local earthquake tomography reveal along-strike variations in structure and crustal deformation regime. A thickened crust imaged in western Bhutan suggests lateral differences in stresses on the Main Himalayan Thrust (MHT), potentially affecting the interseismic coupling and deformation regime. Sikkim, western Bhutan and its foreland are characterized by strike-slip faulting in the Indian basement. Strain is particularly localized along a NW-SE striking mid-crustal fault zone reaching from Chungthang in northeast Sikkim to Dhubri at the northwestern edge of the Shillong Plateau in the foreland. The dextral Dhubri-Chungthang fault zone (DCF) causes segmentation of the Indian basement and the MHT between eastern Nepal and western Bhutan and connects the deformation front of the Himalaya with the Shillong Plateau by forming the western boundary of the Shillong block. The Kopili fault, the proposed eastern boundary of this block, appears to be a diffuse zone of mid-crustal seismicity in the foreland. In eastern Bhutan we image a seismogenic, flat portion of the MHT, which might be either related to a partially creeping segment or to increased background seismicity originating from the 2009 M W 6.1 earthquake. In western-central Bhutan clusters of micro-earthquakes at the front of the High-Himalayas indicate the presence of a mid-crustal ramp and stress buildup on a fully coupled MHT. The area bounded by the DCF in the west and the seismogenic MHT in the east has the potential for M7-8 earthquakes in Bhutan. Similarly, the DCF has the potential to host M7 earthquakes as documented by the 2011 Sikkim and the 1930 Dhubri earthquakes, which were potentially associated with this structure.

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Section: Crustal Structure and Mht In Bhutansupporting

confidence: 64%

“…Recent paleoseismic studies along the Main Frontal Thrust (MFT) in Bhutan suggest the occurrence of one or more large earthquakes in the last millennium (Berthet et al, 2014;Le Roux-Mallouf et al, 2016). Re-interpretation of historical damage reports provides additional evidences for an M8 earthquake in Bhutan in 1714 AD ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Seismotectonics of Bhutan: Evidence for segmentation of the Eastern Himalayas and link to foreland deformation

Diehl

Singer

Hetényi

et al. 2017

Earth and Planetary Science Letters

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“…As per Kundu & Gahalaut (2013), the Kopili fault located to the east of the Shillong Plateau, was also undergoing active deformation with a slip of 2.9 ± 1.5 mm/year. Barman et. al.…”

Section: Seismotectonics Of Kopili Regionmentioning

confidence: 99%

Quantifying Regional Body Wave Attenuation in a Seismic Prone Zone of Northeast India

Bora

Biswas

2017

Pure Appl. Geophys.

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“…The slip rate for the present study is considered to be 1.3 mm/year as per the Northeast India permanent network baselines (Jade et al 2007). The slip rate associated to the Kopili Fault is contributing to accumulation of seismic moment to the order of »70.74 £ 10 15 N m/year (Barman et al 2016). The input parameters (Tables 1 and 2) for the fault characteristic are estimated from existing literatures (Hanks & Boore 1984;Wells & Coppersmith 1994;Jade et al 2007;Angelier & Baruah 2009;Bhattacharya et al 2010;Kayal et al 2006Kayal et al , 2012.…”

Section: Study Area and Databasementioning

confidence: 99%

“…Strain map along with geodetic velocities around the Kopili Fault (modified afterKreemer et al (2003) andBarman et al (2016).…”

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confidence: 99%

Modelling of the Kopili Fault based on slip rate, moment rate and seismic activity in Mikir Hills Plateau of Northeastern India

Sharma

Baruah

2017

Geomatics, Natural Hazards and Risk

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The recurrence period of maximum magnitude earthquake in a seismogenically active formation along the Kopili Fault has been estimated having adequate dependence on the slip rate, moment rate and its seismicity pattern. Here, the frequency-magnitude cum fault areamaximum magnitude relations play a key role with input parameters pertinent to the Kopili Fault zone. Subsequently, where the fault slip rate estimates are not available, the seismic activity is studied from the seismic moment release. The results of this study show that the return period has a strong relation with the fault length, slip rate, strain drop and rigidity. This study ascertains the activity rate in terms of the return period as »50 § 5 years with the moment release of 2.12E+23 dyne-cm from the most active 80-km fault length considering M w 5.5 as reference magnitude under the Kopili Fault zone that may produce a maximum magnitude of M w » 7.6. Finally, we conclude that these models can be used to study the rate of seismicity of the active faults in Northeast India which will provide us prime inputs for seismic hazard analysis of the region and is especially significant for estimating expected return period for poorly known faults or blind faults that lack surface expression. KEYWORDS Slip rate; moment rate; seismicity pattern; maximum magnitude; recurrence period CONTACT Saurabh Baruah

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Estimation of present-day inter-seismic deformation in Kopili fault zone of north-east India using GPS measurements

Cited by 22 publications

References 20 publications

Seismotectonics of Bhutan: Evidence for segmentation of the Eastern Himalayas and link to foreland deformation

Seismotectonics of Bhutan: Evidence for segmentation of the Eastern Himalayas and link to foreland deformation

Quantifying Regional Body Wave Attenuation in a Seismic Prone Zone of Northeast India

Modelling of the Kopili Fault based on slip rate, moment rate and seismic activity in Mikir Hills Plateau of Northeastern India

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