Evidence of a Large Triggered Event in the Nepal Himalaya Following the Gorkha Earthquake: Implications Toward Enhanced Seismic Hazard

2018 ◽  
Vol 175 (8) ◽  
pp. 2807-2819
Author(s):  
Prantik Mandal
Keyword(s):  
Seismic Hazard ◽  
Gorkha Earthquake ◽  
Nepal Himalaya

scholarly journals 25 April 2015 Gorkha Earthquake in Nepal Himalaya (Part 2)

2017 ◽  
Vol 141 ◽  
pp. 235
Author(s):  
N. Purnachandra Rao ◽  
Roland Burgmann ◽  
Jean-Louis Mugnier ◽  
Vineet Gahalaut ◽  
Anand Pandey
Keyword(s):  
Gorkha Earthquake ◽  
Nepal Himalaya ◽  
2015 Gorkha Earthquake

scholarly journals Convergence rate across the Nepal Himalaya and interseismic coupling on the Main Himalayan Thrust: Implications for seismic hazard

2012 ◽  
Vol 117 (B4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Thomas Ader ◽  
Jean-Philippe Avouac ◽  
Jing Liu-Zeng ◽  
Hélène Lyon-Caen ◽  
Laurent Bollinger ◽  
...  
Keyword(s):  
Convergence Rate ◽  
Seismic Hazard ◽  
Nepal Himalaya ◽  
Interseismic Coupling

Contribution of Fault Geometry on Probabilistic Seismic Hazard Assessment in Intermontane Basin: An example from Kathmandu Valley

2020 ◽  
Vol 60 ◽  
pp. 21-36
Author(s):  
Deepak Chamlagain ◽  
Govinda Prasad Niroula
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Main Shock ◽  
Seismic Hazard Assessment ◽  
Probabilistic Seismic Hazard Assessment ◽  
Kathmandu Valley ◽  
Probabilistic Seismic Hazard ◽  
Gorkha Earthquake ◽  
2015 Gorkha Earthquake ◽  
The Himalaya

The intermontane basins of the Himalaya are prone to damaging earthquakes as they are located roughly 10-15 km above the Main Himalayan Thrust (MHT), a major seismogenic thrust fault in the Himalaya.  After the Mw 7.8 2015 Gorkha earthquake, the geometry of the MHT has been investigated using different approaches. Two contrasting models with a single ramp and double ramp geometries are proposed. However, the contribution of these geometries on seismic hazard has not been investigated yet. In this contribution, therefore, a probabilistic seismic hazard assessment is carried out using both models for Kathmandu valley and the obtained results are compared with the measured strong ground motion data of main shock of the 2015 Gorkha seismic sequence at Kirtipur, Kathmandu (rock site). It is found that the areal sources have the least contribution indicating sole contribution of MHT to relatively higher level of seismic hazard in the valley located on the up-dip locked portion of the MHT. The Peak Ground Acceleration (PGA) of the main shock of the 2015 Gorkha earthquake and PGA for 760 yr (exposure period of 50 yr and probability of exceedance 6.36%) of return period adopting both single and double ramp models are approximately same with error level of ± 3.84%. The results indicate that the adopted seismic model fairly represents the seismo-tectonic of the region, particularly of MHT. Considering this as the best fit results, the spatial distribution of the seismic hazard is analysed using double ramp model. It is found that the PGA values in the valley for 760 yr return period vary from 0.24 g to 0.28 g. The PGA values are higher in the southern part and gradually decrease towards north. Such decrease in PGA is consistent with the decrease in locking level of the MHT towards north. The study, therefore, emphasizes detailed geometrical characterization of the MHT while carrying out the seismic hazard assessment in the Himalaya.

scholarly journals 30-year record of Himalaya mass-wasting reveals landscape perturbations by extreme events

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Joshua N. Jones ◽  
Sarah J. Boulton ◽  
Martin Stokes ◽  
Georgina L. Bennett ◽  
Michael R. Z. Whitworth
Keyword(s):  
Extreme Rainfall ◽  
Return Periods ◽  
Monsoon Precipitation ◽  
Mass Wasting ◽  
Short Term ◽  
Gorkha Earthquake ◽  
Empirical Relationships ◽  
Nepal Himalaya ◽  
Rainfall Events ◽  
Hazard Management

AbstractIn mountainous environments, quantifying the drivers of mass-wasting is fundamental for understanding landscape evolution and improving hazard management. Here, we quantify the magnitudes of mass-wasting caused by the Asia Summer Monsoon, extreme rainfall, and earthquakes in the Nepal Himalaya. Using a newly compiled 30-year mass-wasting inventory, we establish empirical relationships between monsoon-triggered mass-wasting and monsoon precipitation, before quantifying how other mass-wasting drivers perturb this relationship. We find that perturbations up to 5 times greater than that expected from the monsoon alone are caused by rainfall events with 5-to-30-year return periods and short-term (< 2 year) earthquake-induced landscape preconditioning. In 2015, the landscape preconditioning is strongly controlled by the topographic signature of the Gorkha earthquake, whereby high Peak Ground Accelerations coincident with high excess topography (rock volume above a landscape threshold angle) amplifies landscape damage. Furthermore, earlier earthquakes in 1934, 1988 and 2011 are not found to influence 2015 mass-wasting.

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
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