Analysis on Seismic Displacement and Change of CORS’ Position Caused by the Gyeongju Earthquake

2016 ◽  
Vol 3 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Joon Kyu Park ◽  
◽  
Min-Gyu Kim ◽  
Keyword(s):  
Seismic Displacement ◽  
Gyeongju Earthquake

scholarly journals Seismically induced changes in groundwater levels and temperatures following the ML5.8 (ML5.1) Gyeongju earthquake in South Korea

2021 ◽  
Author(s):  
Soo-Hyoung Lee ◽  
Jae Min Lee ◽  
Sang-Ho Moon ◽  
Kyoochul Ha ◽  
Yongcheol Kim ◽  
...  
Keyword(s):  
South Korea ◽  
Groundwater Level ◽  
Seismic Waves ◽  
Groundwater Resources ◽  
Fluid Pressure ◽  
Water Levels ◽  
Aquifer System ◽  
Groundwater Levels ◽  
Monitoring Wells ◽  
Gyeongju Earthquake

AbstractHydrogeological responses to earthquakes such as changes in groundwater level, temperature, and chemistry, have been observed for several decades. This study examines behavior associated with ML 5.8 and ML 5.1 earthquakes that occurred on 12 September 2016 near Gyeongju, a city located on the southeast coast of the Korean peninsula. The ML 5.8 event stands as the largest recorded earthquake in South Korea since the advent of modern recording systems. There was considerable damage associated with the earthquakes and many aftershocks. Records from monitoring wells located about 135 km west of the epicenter displayed various patterns of change in both water level and temperature. There were transient-type, step-like-type (up and down), and persistent-type (rise and fall) changes in water levels. The water temperature changes were of transient, shift-change, and tendency-change types. Transient changes in the groundwater level and temperature were particularly well developed in monitoring wells installed along a major boundary fault that bisected the study area. These changes were interpreted as representing an aquifer system deformed by seismic waves. The various patterns in groundwater level and temperature, therefore, suggested that seismic waves impacted the fractured units through the reactivation of fractures, joints, and microcracks, which resulted from a pulse in fluid pressure. This study points to the value of long-term monitoring efforts, which in this case were able to provide detailed information needed to manage the groundwater resources in areas potentially affected by further earthquakes.

scholarly journals Evaluation of seismic displacement demand for unreinforced masonry shear walls

2018 ◽  
Vol 5 (1) ◽  
pp. 1480189 ◽  
Author(s):  
Jayaprakash Vemuri ◽  
Syed Ehteshamuddin ◽  
Subramaniam V. L. Kolluru ◽  
Antonio Formisano
Keyword(s):  
Shear Walls ◽  
Unreinforced Masonry ◽  
Seismic Displacement ◽  
Displacement Demand

Performance-Based Probabilistic Seismic Slope Displacement Procedure

2018 ◽  
Vol 34 (2) ◽  
pp. 673-695 ◽  
Author(s):  
Jorge Macedo ◽  
Jonathan Bray ◽  
Norman Abrahamson ◽  
Thaleia Travasarou
Keyword(s):  
Seismic Performance ◽  
Full Range ◽  
Assessment Procedure ◽  
Seismic Displacement ◽  
Earth Systems ◽  
Crustal Earthquakes ◽  
Wide Range ◽  
Earth Structures ◽  
Hazard Level ◽  
Slope Displacement

Engineers often use simplified seismic slope displacement procedures to evaluate the seismic performance of earth structures and natural slopes. Current state of practice procedures typically separate the estimation of the ground motion intensity measure ( IM) from the estimate of seismic displacement ( D), given the selected IM hazard level. Thus D is estimated based on a single IM value. A straightforward performance-based seismic slope assessment procedure is proposed, which considers the full range of potential IM values to estimate seismic slope displacements directly related to a hazard level. Seismic performance is assessed through either a Newmark-type seismic displacement estimate or a calibrated seismic coefficient that can be used in pseudostatic slope stability analyses. The procedures were developed for a wide range of earth systems for shallow crustal earthquakes and subduction zone earthquakes. Currently employed simplified slope displacement procedures do not provide consistent assessments of the actual seismic slope displacement hazard. The proposed procedures can be readily used in practice to perform rigorous performance-based seismic slope displacement hazard assessments.

Seismic displacement along a log-spiral failure surface with crack using rock Hoek–Brown failure criterion

2017 ◽  
Vol 99 ◽  
pp. 74-85 ◽  
Author(s):  
Lian-heng Zhao ◽  
Xiao Cheng ◽  
Liang Li ◽  
Jia-qi Chen ◽  
Yingbin Zhang
Keyword(s):  
Failure Criterion ◽  
Failure Surface ◽  
Seismic Displacement

Multifault complex rupture and afterslip associated with the 2018 Mw 6.4 Hualien earthquake in northeastern Taiwan

2020 ◽  
Vol 224 (1) ◽  
pp. 416-434
Author(s):  
Dezheng Zhao ◽  
Chunyan Qu ◽  
Xinjian Shan ◽  
Roland Bürgmann ◽  
Wenyu Gong ◽  
...  
Keyword(s):  
Main Shock ◽  
Near Field ◽  
Active Faults ◽  
Fault Model ◽  
Body Waves ◽  
Coseismic Deformation ◽  
Coseismic Slip ◽  
Coulomb Stress Changes ◽  
Seismic Displacement ◽  
Stress Changes

SUMMARY We investigate the coseismic and post-seismic deformation due to the 6 February 2018 Mw 6.4 Hualien earthquake to gain improved insights into the fault geometries and complex regional tectonics in this structural transition zone. We generate coseismic deformation fields using ascending and descending Sentinel-1A/B InSAR data and GPS data. Analysis of the aftershocks and InSAR measurements reveal complex multifault rupture during this event. We compare two fault model joint inversions of SAR, GPS and teleseismic body waves data to illuminate the involved seismogenic faults, coseismic slip distributions and rupture processes. Our preferred fault model suggests that both well-known active faults, the dominantly left-lateral Milun and Lingding faults, and previously unrecognized oblique-reverse west-dipping and north-dipping detachment faults, ruptured during this event. The maximum slip of ∼1.6 m occurred on the Milun fault at a depth of ∼2–5 km. We compute post-seismic displacement time series using the persistent scatterer method. The post-seismic range-change fields reveal large surface displacements mainly in the near-field of the Milun fault. Kinematic inversions constrained by cumulative InSAR displacements along two tracks indicate that the afterslip occurred on the Milun and Lingding faults and the west-dipping fault just to the east. The maximum cumulative afterslip of 0.4–0.6 m occurred along the Milun fault within ∼7 months of the main shock. The main shock-induced static Coulomb stress changes may have played an important role in driving the afterslip adjacent to coseismic high-slip zones on the Milun, Lingding and west-dipping faults.

Research on Seismic Displacement Response of Cable Stayed Bridge without Back Stays

2014 ◽  
Vol 919-921 ◽  
pp. 1039-1042
Author(s):  
Liang Lv ◽  
Bin Liang ◽  
Wen Sheng Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Seismic Wave ◽  
Natural Vibration ◽  
Peak Displacement ◽  
Seismic Displacement ◽  
Displacement Response ◽  
Cable Stayed Bridge ◽  
Element Method ◽  
Design And Construction

Seismic displacement response of cable stayed bridge without back stays was studied in this paper. Based on the cable stayed bridge without back stays on Zhenshui Road in Xinmi City, finite element method (FEM) was applied to calculate and analyze natural vibration and peak displacement response of the structure. The results show that with regard to mid-span and consolidation of pier and main tower, uniaxial seismic wave input results in peak displacement response of corresponding direction is bigger than that of any other direction. Peak displacement response of the top of the main tower is bigger than those of mid-span and consolidation of pier and main tower in any seismic wave input cases, which indicates that the top of the tower needs to be focused in the process of design and construction. Seismic wave along triaxial direction has the biggest impact on the structure. Keywords: cable stayed bridge without back stays; seismic displacement response; seismic wave input; peak displacement response

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