scholarly journals Lateral variation of the Main Himalayan Thrust controls the rupture length of the 2015 Gorkha earthquake in Nepal

2019 ◽  
Vol 5 (6) ◽  
pp. eaav0723 ◽  
Author(s):  
Ling Bai ◽  
Simon L. Klemperer ◽  
James Mori ◽  
Marianne S. Karplus ◽  
Lin Ding ◽  
...  
Keyword(s):  
Wave Speed ◽  
Lateral Variation ◽  
Gorkha Earthquake ◽  
Seismic Waveforms ◽  
Rupture Length ◽  
Direct Measurements ◽  
2015 Gorkha Earthquake ◽  
Speed Change ◽  
Basement Ridge ◽  
Large Earthquakes

The Himalaya orogenic belt produces frequent large earthquakes that affect population centers along a length of over 2500 km. The 2015 Gorkha, Nepal earthquake (Mw 7.8) ruptured the Main Himalayan Thrust (MHT) and allows direct measurements of the behavior of the continental collision zone. We study the MHT using seismic waveforms recorded by local stations that completely cover the aftershock zone. The MHT exhibits clear lateral variation along geologic strike, with the Lesser Himalayan ramp having moderate dip on the MHT beneath the mainshock area and a flatter and deeper MHT beneath the eastern end of the aftershock zone. East of the aftershock zone, seismic wave speed increases at MHT depths, perhaps due to subduction of an Indian basement ridge. A similar magnitude wave speed change occurs at the western end of the aftershock zone. These gross morphological structures of the MHT controlled the rupture length of the Gorkha earthquake.

Factors Contributing Building Reconstruction and Renovation Challenges: A Case Study after April 2015 Gorkha Earthquake

2020 ◽  
Author(s):  
Krishna P. Kisi ◽  
Rujan Kayastha ◽  
Nipesh Pradhananga ◽  
Joseph Shrestha ◽  
Dibangar Khoteja
Keyword(s):  
Gorkha Earthquake ◽  
2015 Gorkha Earthquake ◽  
Building Reconstruction

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.

scholarly journals Regional variation of stress level in the Himalayas after the 25 April 2015 Gorkha earthquake (Nepal) estimated usingb-values

2018 ◽  
Vol 15 (3) ◽  
pp. 921-927 ◽  
Author(s):  
Pudi Ramesh ◽  
Tapas R Martha ◽  
K Vinod Kumar
Keyword(s):  
Stress Level ◽  
Regional Variation ◽  
Gorkha Earthquake ◽  
2015 Gorkha Earthquake

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

System Identification and Finite Element Modelling of Damaged Bal Mandir Monument in Kathmandu After the 2015 Gorkha Earthquake

2021 ◽  
pp. 222-231
Author(s):  
Rajesh Rupakhety ◽  
Dipendra Gautam ◽  
Rabindra Adhikari ◽  
Pratyush Jha ◽  
Lalit Bhatt ◽  
...  
Keyword(s):  
Finite Element ◽  
System Identification ◽  
Finite Element Modelling ◽  
Gorkha Earthquake ◽  
Element Modelling ◽  
2015 Gorkha Earthquake
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