Strain Accumulation and Release of the Gorkha, Nepal, Earthquake (Mw 7.8, 25 April 2015)

2018 ◽  
pp. 315-329
Author(s):  
Federico Morsut ◽  
Tommaso Pivetta ◽  
Carla Braitenberg ◽  
Giorgio Poretti
Keyword(s):  
Strain Accumulation ◽  
Nepal Earthquake

Strain Accumulation and Release of the Gorkha, Nepal, Earthquake (M w 7.8, 25 April 2015)

2017 ◽  
Vol 175 (5) ◽  
pp. 1909-1923 ◽  
Author(s):  
Federico Morsut ◽  
Tommaso Pivetta ◽  
Carla Braitenberg ◽  
Giorgio Poretti
Keyword(s):  
Strain Accumulation ◽  
Nepal Earthquake

SLIP AND STRAIN ACCUMULATION ALONG THE SADIE CREEK FAULT, OLYMPIC PENINSULA, WA

2019 ◽  
Author(s):  
Cody Duckworth ◽  
◽  
Colin B. Amos ◽  
Elizabeth Schermer ◽  
John P. Loveless ◽  
...  
Keyword(s):  
Strain Accumulation ◽  
Olympic Peninsula

scholarly journals On the Plastic Strain Accumulation in Notched Bars During High-Temperature Creep Dwell

2020 ◽  
Vol 36 (2) ◽  
pp. 167-176 ◽  
Author(s):  
Daniele Barbera ◽  
Haofeng Chen
Keyword(s):  
High Temperature ◽  
Cyclic Loading ◽  
Plastic Strain ◽  
Kinematic Hardening ◽  
High Temperature Creep ◽  
Strain Accumulation ◽  
Material Models ◽  
Cyclic Loading Condition ◽  
Hardening Material ◽  
Temperature Creep

ABSTRACTStructural integrity plays an important role in any industrial activity, due to its capability of assessing complex systems against sudden and unpredicted failures. The work here presented investigates an unexpected new mechanism occurring in structures subjected to monotonic and cyclic loading at high temperature creep condition. An unexpected accumulation of plastic strain is observed to occur, within the high-temperature creep dwell. This phenomenon has been observed during several full inelastic finite element analyses. In order to understand which parameters make possible such behaviour, an extensive numerical study has been undertaken on two different notched bars. The notched bar has been selected due to its capability of representing a multiaxial stress state, which is a practical situation in real components. Two numerical examples consisting of an axisymmetric v-notch bar and a semi-circular notched bar are considered, in order to investigate different notches severity. Two material models have been considered for the plastic response, which is modelled by both Elastic-Perfectly Plastic and Armstrong-Frederick kinematic hardening material models. The high-temperature creep behaviour is introduced using the time hardening law. To study the problem several results are presented, as the effect of the material model on the plastic strain accumulation, the effect of the notch severity and the mesh element type and sensitivity. All the findings further confirm that the phenomenon observed is not an artefact but a real mechanism, which needs to be considered when assessing off-design condition. Moreover, it might be extremely dangerous if the cyclic loading condition occurs at such a high loading level.

scholarly journals The stop-start control of seismicity by fault bends along the Main Himalayan Thrust

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Sharadha Sathiakumar ◽  
Sylvain Barbot
Keyword(s):  
Seismic Hazards ◽  
Geodetic Data ◽  
Source Mechanism ◽  
Seismogenic Zone ◽  
Seismic Cycle ◽  
Rupture Propagation ◽  
Alternative Models ◽  
Nepal Earthquake

AbstractThe Himalayan megathrust accommodates most of the relative convergence between the Indian and Eurasian plates, producing cycles of blind and surface-breaking ruptures. Elucidating the mechanics of down-dip segmentation of the seismogenic zone is key to better determine seismic hazards in the region. However, the geometry of the Himalayan megathrust and its impact on seismicity remains controversial. Here, we develop seismic cycle simulations tuned to the seismo-geodetic data of the 2015 Mw 7.8 Gorkha, Nepal earthquake to better constrain the megathrust geometry and its role on the demarcation of partial ruptures. We show that a ramp in the middle of the seismogenic zone is required to explain the termination of the coseismic rupture and the source mechanism of up-dip aftershocks consistently. Alternative models with a wide décollement can only explain the mainshock. Fault structural complexities likely play an important role in modulating the seismic cycle, in particular, the distribution of rupture sizes. Fault bends are capable of both obstructing rupture propagation as well as behave as a source of seismicity and rupture initiation.

scholarly journals Contribution to crustal strain accumulation of minor faults: a case study across the Niigata–Kobe Tectonic Zone, Japan

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Tomonori Tamura ◽  
Kiyokazu Oohashi ◽  
Makoto Otsubo ◽  
Ayumu Miyakawa ◽  
Masakazu Niwa
Keyword(s):  
Strain Accumulation ◽  
Tectonic Zone ◽  
Crustal Strain

Ex-Post Coping Responses and Post-Disaster Resilience: a Case from the 2015 Nepal Earthquake

2020 ◽  
Vol 4 (3) ◽  
pp. 575-599 ◽  
Author(s):  
Veeshan Rayamajhee ◽  
Alok K. Bohara ◽  
Virgil Henry Storr
Keyword(s):  
Disaster Resilience ◽  
Coping Responses ◽  
Nepal Earthquake ◽  
Ex Post ◽  
Post Disaster ◽  
2015 Nepal Earthquake
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