scholarly journals Crustal Deformation of South Korea After the Tohoku-Oki Earthquake: Deformation Heterogeneity and Seismic Activity

Tectonics ◽  
2018 ◽  
Vol 37 (8) ◽  
pp. 2389-2403 ◽  
Author(s):  
Sungshil Kim ◽  
Jin-Han Ree ◽  
Ha Su Yoon ◽  
Byung-Kyu Choi ◽  
Pil-Ho Park
Keyword(s):  
South Korea ◽  
Crustal Deformation ◽  
Seismic Activity

Current status of design basis earthquake level for nuclear power plant sites in several countries

2021 ◽  
Author(s):  
Hoseon Choi ◽  
Seung Gyu Hyun
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
South Korea ◽  
Seismic Activity ◽  
Nuclear Power ◽  
Current Status ◽  
Seismic Safety ◽  
Design Basis ◽  
Design Earthquake ◽  
Design Construction

<p>According to strict criteria step by step for site selection, design, construction and operation, the seismic safety of nuclear power plant (NPP) sites in South Korea are secured by considering design basis earthquake (DBE) level capable of withstanding the maximum ground motions that can occur on the site. Therefore, it is intended to summarize DBE level and its evaluation details for NPP sites in several countries.</p><p>Similar but different terms are used for DBE from country to country, i.e. safe shutdown earthquake (SSE), design earthquake (DE), SL2, Ss, and maximum calculated earthquake (MCE). They may differ when applied to actual seismic design process, and only refer to approximate comparisons. This script used DBE as a representative term, and DBE level was based on horizontal values.</p><p>The DBE level of NPP sites depends on seismic activity of the area. Japan and Western United States, where earthquakes occur more frequently than South Korea, have high DBE values. The DBE level of NPP sites in South Korea has been confirmed to be similar or higher compared to that of Central and Eastern Unites Sates and Europe, which have similar seismic activity.</p>

scholarly journals GPS crustal deformation, strain rate, and seismic activity after the 1999 Chi-Chi earthquake in Taiwan

2010 ◽  
Vol 115 (B7) ◽  
Author(s):  
Kuan-Chuan Lin ◽  
Jyr-Ching Hu ◽  
Kuo-En Ching ◽  
Jacques Angelier ◽  
Ruey-Juin Rau ◽  
...  
Keyword(s):  
Strain Rate ◽  
Crustal Deformation ◽  
Seismic Activity ◽  
Deformation Strain ◽  
Deformation Strain Rate

Inelastic strain rate and stress fields in and around an aseismic zone of Kyushu Island, Japan, inferred from seismic and GNSS data

2020 ◽  
Vol 221 (1) ◽  
pp. 289-304
Author(s):  
Y Yuasa ◽  
S Matsumoto ◽  
S Nakao ◽  
T Matsushima ◽  
T Ohkura
Keyword(s):  
Stress Concentration ◽  
Strain Rate ◽  
Crustal Deformation ◽  
Lower Crust ◽  
Seismic Activity ◽  
Deformation Zone ◽  
Inelastic Deformation ◽  
Upper Crust ◽  
Localized Deformation ◽  
Concentration Process

SUMMARY Understanding earthquake processes and crustal deformation requires knowledge of the stress concentration process in the crust. With the enhancement of observation networks, it has become possible to consider in detail the relationships between localized deformation and seismic activity in island arcs and the process of stress concentration. According to previous studies, inelastic deformation in localized weak zones in the crust is considered to play an important role in the stress concentration process. Kyushu, located in southwest Japan, has a 20–30 km band-like active seismic activity and an enclosed aseismic zone. In particular, a part of the seismic active region called the Beppu-Simahara Graben, which is dominated by north–south extensional deformation, is characterized by high seismic activity and a remarkable aseismic zone. We identified the relationship between inelastic deformation and stress concentration processes in this area by using analyses of geodetic and seismic data. The results inverted from both the strain rate field obtained by the geodetic observations and the deviatoric stress field estimated from focal mechanism data reveal a large inelastic deformation zone ($\sim {10^{ - 7}} \,\mathrm{ yr}^{-1}$) beneath the area of active seismicity. From comparison with previous works, the inelastic deformation zone in the lower crust may correspond to an area with high temperature and/or fluid. This may suggest that inelastic deformation is in progress in the area where the strength of lower crustal rocks has reduced due to the presence of geothermics and/or fluids. Furthermore, we confirmed that this inelastic deformation causes stress concentrations of up to $10\,\,{\rm{kPa}}\,\,{\rm{yr}}^{-1}$ in the upper crust. These results show that stress concentration occurs locally in the upper crust, above the inelastic deformation zone in the weakened lower crust, owing to the presence of geothermal and/or fluid; this stress concentration induces seismic activity and crustal deformation.

Deep structure of the northeastern Japan arc and its implications for crustal deformation and shallow seismic activity

2005 ◽  
Vol 403 (1-4) ◽  
pp. 59-75 ◽  
Author(s):  
Akira Hasegawa ◽  
Junichi Nakajima ◽  
Norihito Umino ◽  
Satoshi Miura
Keyword(s):  
Crustal Deformation ◽  
Seismic Activity ◽  
Deep Structure ◽  
Shallow Seismic ◽  
Northeastern Japan

GROUNDWATER CAN TELL US SEASONAL AND SPATIAL VARIATION OF SEISMIC ACTIVITY IN SOUTH KOREA

2019 ◽  
Author(s):  
SUK HWAN JANG ◽  
KYOUNG DOO OH ◽  
JAE-KYOUNG LEE ◽  
JUN WON JO
Keyword(s):  
South Korea ◽  
Spatial Variation ◽  
Seismic Activity

scholarly journals Crustal Deformation and Shallow Seismic Activity beneath the Northeastern Japan Arc

2004 ◽  
Vol 56 (4) ◽  
pp. 413-424
Author(s):  
Akira HASEGAWA ◽  
Junichi NAKAJIMA ◽  
Norihito UMINO ◽  
Satoshi MIURA ◽  
Yoko SUWA
Keyword(s):  
Crustal Deformation ◽  
Seismic Activity ◽  
Shallow Seismic ◽  
Northeastern Japan
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