The migration of the crustal deformation peak area in the eastern Himalayan Syntaxis inferred from present-day crustal deformation and morpho-tectonic markers

Zhang, Ling; Liang, Shiming; Yang, Xiaoping; Dai, Chenglong

doi:10.1016/j.geog.2021.02.002

Cited by 8 publications

(2 citation statements)

References 38 publications

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“…It is worth noting that the effects of coand post-seismic deformations on the GPS velocity eld in the EHS caused by several large historical earthquakes (e.g., the 2008 Mw7.9 Wenchuan Earthquake) have also been effectively handled. In addition, Zhang et al (2021b) published GPS velocities from 23 stations in the Jiali fault, which were also included in our dataset to constrain the kinematics of the regional faults. These GPS velocity elds have good availability and reliability for crustal deformation in the EHS.…”

Section: Gps Observationsmentioning

confidence: 99%

Seismic moment deficit and hazard assessment of the Eastern Himalayan Syntaxis

Zhang,

Pan

2024

Preprint

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The largest earthquake ever recorded on land, the Assam Mw8.6 earthquake, occurred in the Eastern Himalayan Syntaxis (EHS), which has caused great concern regarding seismic hazard in this region. The seismic potential of the major faults in the EHS was evaluated by comparing the accumulation and release of seismic moments. First, constrained by the latest long-term global positioning system (GPS) measurements, the slip rates and locking depths of major faults in the EHS were calculated using a three-dimensional (3D) elastic block model. Second, the seismic moment release of the major faults in the EHS from 1800 to 2022 was estimated using an earthquake catalog. The results show that the seismic moment deficit of the western and eastern Bhutan and Assam segments of the Main Himalayan Thrust (MHT) are 2.6 × 10 21, 2.0 × 10 21 and 7.5 × 10 20 N · m, which are equivalent to seismic moments of Mw 8.3, 8.2 and 7.9, respectively. The MHT remains a major source of future seismic hazards in the EHS. In addition, the Jiali Fault and Naga Thrust were capable of generating earthquakes of Mw 7.4. This study also shows that if the seismicity of the MHT follows the Gutenberg–Richter (GR) law, the recurrence period of the Assam earthquake is approximately 2100 year.

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Section: Gps Observationsmentioning

confidence: 99%

Seismic moment deficit and hazard assessment of the Eastern Himalayan Syntaxis

Zhang,

Pan

2024

Preprint

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“…Earthquakes and landslides are frequent in the NER states, and India is ranked 6 th expanse on earth due to shifts along the thrusts, faults and stability failure that has evolved through tectonics, geological, fluvial, and anthropogenic processes Tiwari et al recurrent seismicity of high and low magnitude in the NER of India and Myanmar (IMR) range caused by collision of Indo-Eurasian tectonics accompanied by subduction due to inter continental collisions [3][4][5][6][7][8][9][10][11]. The NER of India suffers from frequent landslides especially during torrential monsoon rains being triggered by frequent seismic activities, torrential lithology of the area.…”

Section: Review Of Literaturementioning

confidence: 99%

Probing the Crisis of Regional Connectivity Instigated by the Natural Disasters, Mizoram, India

Mishra

Puhan

Mishra

2021

IJECC

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Mizoram, in eastern Himalayas of India, is educated but thinly populous young state of area 21081sq km with hilly forest cover of (≈90.68%) The major connectivity is by roads of length 8912km (2019) that connects India’s mainland, Myanmar and Bangladesh and about no rail tracks. The state is housed in various folds and faults over Indo-Burmese tectonic zone (Indo Eurasian plate tectonics), and housed adjacent to 950 Ridges. The booming craggy state is combatting with its road network progress due to frequent low magnitude tremors, landslides, floods, and heavy rainfalls. The data of earthquakes, landslides, rainfall, and road progress were collected, and analyzed. The connectivity growth is reported tough and challenging within forests, broken relief, frequent ghats roads, and deep gorges, in topography that hinders the progress in pavement growth. Present study focuses on the ameliorative measures of hill road construction in Mizoram by adhering to the IRC: 52-2019, changing modus operandi of national contract bids, amateurish engineering design, procurement policies, bidder’s expertise and commitment for execution. The non-availability menial labours and technocrats have stemmed many legal issues & disputes between the government and the contractors. Faulty planning, engineering design, executant’s approach, procurement policies and the contractor’s skill, contract administration and construction management, road safety challenges, contract documentation, and inability of deployed bidders needs to be improved in Mizoram. To cater the needs of up-gradation/ new constructions, the hurdles warrant cutting edge impulses through EIA, EMP, DPR, amateurish design, and updating procurement policies that should supersede the orthodox practices.

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Seismic moment deficit and hazard assessment of the Eastern Himalayan Syntaxis

Zhang,

Pan

2024

Nat Hazards

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The largest earthquake ever recorded on land, the Assam (moment magnitude, Mw8.6), occurred in the Eastern Himalayan Syntaxis. To assess the current seismic hazard in this region, we evaluated the seismic potential of major faults in the Eastern Himalayan Syntaxis by comparing the accumulation and release of seismic moments. First, constrained by long-term global positioning system measurements, we calculated the slip rates and locking depths of major faults using a three-dimensional elastic block model. Second, we estimated the seismic moment release of the major faults from 1800 to 2023 using an earthquake catalog. The results indicate that the Main Himalayan Thrust remains a significant seismic hazard in the Eastern Himalayan Syntaxis, capable of producing earthquakes with a magnitude of Mw greater than or equal to 7.9. Additionally, the Naga Thrust and Jiali Fault have the potential to generate earthquakes of Mw greater than 7.4. Presently, the probability of earthquakes exceeding Mw7.0 on other faults is relatively low. If seismicity along the Main Himalayan Thrust follows the Gutenberg–Richter law, the recurrence period for the Assam earthquake is approximately 2000 years. The results of this study provide a reference for future seismic hazard analyses in this region.

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The migration of the crustal deformation peak area in the eastern Himalayan Syntaxis inferred from present-day crustal deformation and morpho-tectonic markers

Cited by 8 publications

References 38 publications

Seismic moment deficit and hazard assessment of the Eastern Himalayan Syntaxis

Seismic moment deficit and hazard assessment of the Eastern Himalayan Syntaxis

Probing the Crisis of Regional Connectivity Instigated by the Natural Disasters, Mizoram, India

Seismic moment deficit and hazard assessment of the Eastern Himalayan Syntaxis

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