Microzonation of Seismic Hazards and Assessment of Potential Human Fatality in the Chianan Area, Taiwan

2016 ◽  
Vol 106 (1) ◽  
pp. 141-157
Author(s):  
Kun‐Sung Liu ◽  
Yi‐Ben Tsai
Keyword(s):  
Seismic Hazards

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.

Geological variation in S-wave velocity structures in Northern Taiwan and implications for seismic hazards based on ambient noise analysis

2014 ◽  
Vol 96 ◽  
pp. 353-360
Author(s):  
Ya-Chuan Lai ◽  
Bor-Shouh Huang ◽  
Yu-Chih Huang ◽  
Huajian Yao ◽  
Ruey-Der Hwang ◽  
...  
Keyword(s):  
Wave Velocity ◽  
Ambient Noise ◽  
Noise Analysis ◽  
Seismic Hazards ◽  
S Wave ◽  
Northern Taiwan

Seismic Risk Evaluation of Retrofitted Reinforced Concrete Buildings Utilizing Base Isolation and Considering Mainshock-Aftershock

2013 ◽  
Vol 671-674 ◽  
pp. 1372-1375
Author(s):  
Rui Long Han ◽  
Yue Li
Keyword(s):  
Seismic Risk ◽  
Risk Evaluation ◽  
Base Isolation ◽  
Seismic Hazards ◽  
Nonlinear Finite Element ◽  
Structural Safety ◽  
Seismic Fragility ◽  
Rc Frame ◽  
Actual Situation ◽  
Element Analysis

The insufficient consideration of seismic risk caused hidden danger for structural safety in many areas. A promising retrofit method for these structures is base isolation. In order to evaluate the effectiveness of this approach, a hypothetical RC frame based on actual situation is designed to be retrofitted using base isolation. Then, seismic fragilities for both un-retrofitted and isolated frames are analyzed, utilizing the results obtained from nonlinear finite-element analysis. The ground motion of the analysis contains 22 earthquake motions, and the results of considering mainshock-aftershock and those of considering only mainshock are compared. The study proves the well designed base isolation can reduce the seismic fragility of the RC frame effectively, and the exclusive consideration of mainshock will underestimate the seismic hazards for structures.

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