Seismotectonics of the Nepal Himalaya from a local seismic network

Pandey, Manish; Tandukar, Ramalochan Prasad; Avouac, Jean Philippe; Vergne, Jérôme; Héritier, Th

doi:10.1016/s1367-9120(99)00034-6

Cited by 232 publications

(171 citation statements)

References 28 publications

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“…Other abbreviated terms are discussed in Figure 1 and Table 1. energy in the ILC of the Indian plate, which was released through generation of two mainshocks and a number of aftershocks. The present results also corroborate the views of Pandey et al 63 . Strain energy dissipation occurring through the flexing zone of the subducting lithosphere was estimated elsewhere to be about ~60% (ref.…”

Section: Discussionsupporting

confidence: 94%

Insights into the Great <i>Mw</i> 7.9 Nepal Earthquake of 25 April 2015

2017

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The 2015 Mw 7.9 earthquake occurred in the Nepal Himalaya between the Indian and Asian plates. The gravity modelling has been carried out along a 2D trench-orthogonal profile passing through the epicentre of this earthquake. The projections of mainshocks and aftershocks show their major confinement around the bending segment of the Indian upper crust (IUC). The operative shallowly plunging maximum compressive stress led to the accumulation of strain energy around the bending zone of the IUC, and triggered thrust-dominated southward movement of the Indian crustal block along a shallowly, dipping shear plane in the anisotropic layer. This can be broadly explained by three-stage rupture processes: the first one was associated with slow nucleation and rupture growth for early ~15 sec, the second one migrated upward, rupturing the uppermost part of the IUC for the next ~10 sec, and the third one propagated very fast during deformation for the remaining ~25 sec till the fracture-tip reached the overlying brittle Asian crust.

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Section: Discussionsupporting

confidence: 94%

Insights into the Great <i>Mw</i> 7.9 Nepal Earthquake of 25 April 2015

2017

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“…Gorkha earthquake is no exception in terms of enormous losses in environmental impacts, casualties and infrastructures. Details on geology and seismo-tectonics of Nepal Himalaya can be found in several literatures by Upreti and Le Fort (1999), Sakai (2001), Pandey et al (1999), Dhital (2014), Hossler et al (2016); Bollinger et al (2016), Wesnousky et al (2017) and others.…”

Section: Geology and Seismicitymentioning

confidence: 99%

Unearthed lessons of 25 April 2015 Gorkha earthquake (M_W 7.8): geotechnical earthquake engineering perspectives

Gautam¹

2017

Geomatics, Natural Hazards and Risk

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Gorkha earthquake (M W 7.8) of 25 April 2015 struck central, eastern and western Nepal and neighbouring areas. Enormous losses during Gorkha earthquake were attributed to collapse of 498,852 buildings, 446 public health facilities and partial damage of 256,697 buildings, 765 health facilities as well as severely affected 2900 cultural and historical sites. Anomalies were in particular observed in terms of localized damage and recurrent damages during 1833, 1934, 1988 and 2015 earthquakes. This paper reports geotechnical earthquake engineering observations noted during field reconnaissance conducted in affected areas. Damage reports from historical as well as recent Gorkha earthquakes are mapped in this paper. To depict lessons, forensic interpretations are presented considering 1833, 1934, 1988 and 2015 earthquakes.

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“…In the Himalayan continental collision region, a belt of microseismicity has been observed (e.g., Pandey et al 1995Pandey et al , 1999, which corresponds to the creeping-locked transition (e.g., Ader et al 2012). From the microseismicity belt to the surface, the Main Himalayan thrust fault is considered to be fully coupled and it has been predicted that large interplate earthquakes will occur (e.g., Bilham et al 1997;Ader et al 2012).…”

Section: Source Model Of the 2015 Gorkha Earthquakementioning

confidence: 99%

Estimation of the source process of the 2015 Gorkha, Nepal, earthquake and simulation of long-period ground motions in the Kathmandu basin using a one-dimensional basin structure model

Kubo

Dhakal

Suzuki

et al. 2016

Earth Planets Space

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The source rupture process of the 2015 Gorkha, Nepal, earthquake was estimated by the joint kinematic source inversion with near-field waveforms, teleseismic waveforms, and geodetic data. The estimated seismic moment and maximum slip are 7.5 × 10 20 Nm (M w 7.9) and 7.3 m, respectively. The total source duration is approximately 50 s. The derived source model has a unilateral rupture toward the east and a large-slip area north of Kathmandu with the maximum slip. Using the estimated source model together with a one-dimensional (1-D) velocity basin structure model, long-period (> 4 s) ground motions were simulated at a site located in the Kathmandu basin, where strong ground motions with predominant components in a 4-5s period were observed during the 2015 Gorkha earthquake. This simulation demonstrated that the major features of the observed waveforms can be reproduced by our source model and the 1-D basin structure model.

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Seismotectonics of the Nepal Himalaya from a local seismic network

Cited by 232 publications

References 28 publications

Insights into the Great <i>Mw</i> 7.9 Nepal Earthquake of 25 April 2015

Insights into the Great <i>Mw</i> 7.9 Nepal Earthquake of 25 April 2015

Unearthed lessons of 25 April 2015 Gorkha earthquake (M_W 7.8): geotechnical earthquake engineering perspectives

Estimation of the source process of the 2015 Gorkha, Nepal, earthquake and simulation of long-period ground motions in the Kathmandu basin using a one-dimensional basin structure model

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Seismotectonics of the Nepal Himalaya from a local seismic network

Cited by 232 publications

References 28 publications

Insights into the Great <i>Mw</i> 7.9 Nepal Earthquake of 25 April 2015

Insights into the Great <i>Mw</i> 7.9 Nepal Earthquake of 25 April 2015

Unearthed lessons of 25 April 2015 Gorkha earthquake (MW 7.8): geotechnical earthquake engineering perspectives

Estimation of the source process of the 2015 Gorkha, Nepal, earthquake and simulation of long-period ground motions in the Kathmandu basin using a one-dimensional basin structure model

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Unearthed lessons of 25 April 2015 Gorkha earthquake (M_W 7.8): geotechnical earthquake engineering perspectives