scholarly journals Lateral Ground Spread at Kausaltar, Kathmandu that Appeared in the 2015 Gorkha Earthquake

2021 ◽  
Author(s):  
Masataka Shiga ◽  
Kazuo Konagai ◽  
Rama Mohan Pokhrel ◽  
Takaaki Ikeda
Keyword(s):  
Urban Areas ◽  
Ground Deformation ◽  
Silty Sand ◽  
Adjacent Area ◽  
In Situ Tests ◽  
Gorkha Earthquake ◽  
Earthen Structures ◽  
2015 Gorkha Earthquake ◽  
Prone Area ◽  
Penetration Tests

Abstract The April 25, 2015 Gorkha earthquake jolted the central region of Nepal causing extensive damage to buildings and earthen structures in both mountainous and urban areas of Nepal. Kathmandu-Bhaktapur road, one section of the Araniko Highway, crosses a small valley in the center of the Kathmandu Basin with an embankment. This embankment and adjacent area were deformed in the earthquake. To examine the cause of this ground deformation, several in-situ tests such as micro-tremor measurements, standard penetration tests (SPT), multi-channel analyses of surface waves (MASW), and C 14 dating were conducted. These tests show that a silty sand layer with low plasticity has most likely been liquefied 5 to 8 meters underground. It is also shown that groundwater lowering using existing wells can decrease the liquefaction-prone area by 81%.

scholarly journals Tacit networks, crucial care: Informal networks and disaster response in Nepal’s 2015 Gorkha earthquake

Urban Studies ◽  
2018 ◽  
Vol 56 (3) ◽  
pp. 561-577 ◽  
Author(s):  
Rocio Carrero ◽  
Michele Acuto ◽  
Asaf Tzachor ◽  
Niraj Subedi ◽  
Ben Campbell ◽  
...  
Keyword(s):  
Social Networks ◽  
Urban Areas ◽  
Disaster Response ◽  
Informal Networks ◽  
Gorkha Earthquake ◽  
Local Networks ◽  
Human Needs ◽  
2015 Gorkha Earthquake ◽  
Informal Social Networks

It is often reiterated that a better understanding of local networks and needs is key to risk reduction. Nevertheless, the crucial role of informal social networks and actors in the catering for human needs in disaster circumstances remains largely under-explored. If we have to rethink the ‘work’ that informality does for our understanding of urban areas, its contribution to resilience, and take it seriously in the ‘full spectrum of risk’ in urban and peri-urban centres, better and more balanced methods are needed. This paper attends to this gap. Examining the mechanisms of aid provision in the aftermath of the 2015 Gorkha Earthquake in Nepal, it details an experimental set of quantitative research methods to explore the role of informal social networks in the provision of critical human needs in natural disasters. Relying on a sample of 160 households across four districts and 16 villages in the built environment affected by the Gorkha earthquake, the paper reveals that, overall, a wide disparity exists in the comparative importance of organisations in the provision of aid and resources. Much crucial after-disaster care is catered for by a mix of relatives, temples, friends, neighbours and local clubs. It highlights the importance of informal networks in understanding, and theorising, governance (of disaster and of the ‘urban’ more in general), and calls for greater attention to its role. It is time, it argues, to revalue informal disaster governance networks as a crucial, not tacit, component of disaster response.

scholarly journals The Influence of Surface Topography on the Weak Ground Shaking in Kathmandu Valley during the 2015 Gorkha Earthquake, Nepal

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 678
Author(s):  
Mark van der Meijde ◽  
Md Ashrafuzzaman ◽  
Norman Kerle ◽  
Saad Khan ◽  
Harald van der Werff
Keyword(s):  
Numerical Simulations ◽  
Surface Topography ◽  
Seismic Energy ◽  
Spectral Element ◽  
Kathmandu Valley ◽  
Ground Displacement ◽  
Gorkha Earthquake ◽  
Ground Shaking ◽  
Earthquake Scenarios ◽  
2015 Gorkha Earthquake

It remains elusive why there was only weak and limited ground shaking in Kathmandu valley during the 25 April 2015 Mw 7.8 Gorkha, Nepal, earthquake. Our spectral element numerical simulations show that, during this earthquake, surface topography restricted the propagation of seismic energy into the valley. The mountains diverted the incoming seismic wave mostly to the eastern and western margins of the valley. As a result, we find de-amplification of peak ground displacement in most of the valley interior. Modeling of alternative earthquake scenarios of the same magnitude occurring at different locations shows that these will affect the Kathmandu valley much more strongly, up to 2–3 times more, than the 2015 Gorkha earthquake did. This indicates that surface topography contributed to the reduced seismic shaking for this specific earthquake and lessened the earthquake impact within the valley.

Characterizing the Kathmandu Valley sediment response through strong motion recordings of the 2015 Gorkha earthquake sequence

2017 ◽  
Vol 714-715 ◽  
pp. 146-157 ◽  
Author(s):  
S. Rajaure ◽  
D. Asimaki ◽  
E.M. Thompson ◽  
S. Hough ◽  
S. Martin ◽  
...  
Keyword(s):  
Strong Motion ◽  
Earthquake Sequence ◽  
Kathmandu Valley ◽  
Gorkha Earthquake ◽  
2015 Gorkha Earthquake

scholarly journals Comparison of Earthquake-Triggered Landslide Inventories: A Case Study of the 2015 Gorkha Earthquake, Nepal

Geosciences ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 437 ◽  
Author(s):  
Meena ◽  
Tavakkoli Piralilou
Keyword(s):  
Risk Mitigation ◽  
Landslide Susceptibility Mapping ◽  
Gorkha Earthquake ◽  
Area Distribution ◽  
2015 Gorkha Earthquake ◽  
The World ◽  
Mapping Techniques ◽  
Event Based ◽  
The Impact

Despite landslide inventories being compiled throughout the world every year at different scales, limited efforts have been made to critically compare them using various techniques or by different investigators. Event-based landslide inventories indicate the location, distribution, and detected boundaries of landslides caused by a single event, such as an earthquake or a rainstorm. Event-based landslide inventories are essential for landslide susceptibility mapping, hazard modeling, and further management of risk mitigation. In Nepal, there were several attempts to map landslides in detail after the Gorkha earthquake. Particularly after the main event on 25 April 2015, researchers around the world mapped the landslides induced by this earthquake. In this research, we compared four of these published inventories qualitatively and quantitatively using different techniques. Two principal methodologies, namely the cartographical degree of matching and frequency area distribution (FAD), were optimized and applied to evaluate inventory maps. We also showed the impact of using satellite imagery with different spatial resolutions on the landslide inventory generation by analyzing matches and mismatches between the inventories. The results of our work give an overview of the impact of methodology selection and outline the limitations and advantages of different remote sensing and mapping techniques for landslide inventorying.

scholarly journals OVERALL FEATURES OF MULTIPLE LAND-SLIDES ALONG TRISHULI RIVER TRIGGERED BY THE 2015 GORKHA EARTHQUAKE, NEPAL

2019 ◽  
Vol 75 (4) ◽  
pp. I_554-I_561
Author(s):  
Alessandra Mayumi NAKATA ◽  
Hikaru TOMITA ◽  
Kazuo KONAGAI ◽  
Masataka SHIGA ◽  
Takaaki IKEDA ◽  
...  
Keyword(s):  
Gorkha Earthquake ◽  
2015 Gorkha Earthquake
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