scholarly journals Elastogravity Waves and Dynamic Ground Motions in the Korean Peninsula Generated by the March 11, 2011 M W 9.0 Tohoku‐Oki Megathrust Earthquake

2021 ◽  
Vol 126 (2) ◽  
Author(s):  
Tae‐Kyung Hong ◽  
Ilgoo Kim ◽  
Seongjun Park ◽  
Dongwoo Kil
Keyword(s):  
Korean Peninsula ◽  
Ground Motions ◽  
Megathrust Earthquake

scholarly journals Energetic Rupture and Tsunamigenesis during the 2020 Mw 7.4 La Crucecita, Mexico Earthquake

2020 ◽  
Vol 92 (1) ◽  
pp. 140-150
Author(s):  
Diego Melgar ◽  
Angel Ruiz-Angulo ◽  
Xyoli Pérez-Campos ◽  
Brendan W. Crowell ◽  
Xiaohua Xu ◽  
...  
Keyword(s):  
Tide Gauge ◽  
Ground Motions ◽  
Edge Wave ◽  
Megathrust Earthquake ◽  
Moment Ratio ◽  
Gulf Of Tehuantepec ◽  
Mexico Earthquake ◽  
Wave Modes

Abstract The La Crucecita earthquake ruptured on the megathrust, generating strong shaking and a modest but long-lived tsunami. This is a significant earthquake that illuminates important aspects of the behavior of the megathrust as well as the potential related hazards. The rupture is contained within 15–30 km depth, ground motions are elevated, and the energy to moment ratio is high. We argue that it represents a deep megathrust earthquake, the 30 km depth is the down-dip edge of slip. The inversion is well constrained, ruling out any shallow slip. It is the narrow seismogenic width and the configuration of the coastline that allow for deformation to occur offshore. The minor tsunamigenesis can be accounted for by the deep slip patch. There is a significant uplift at the coast above it, which leads to negative maximum tsunami amplitudes. Finally, tide-gauge recordings show that edge-wave modes were excited and produce larger amplitudes and durations in the Gulf of Tehuantepec.

Three-Dimensional Seismic-Wave Propagation Simulations in the Southern Korean Peninsula Using Pseudodynamic Rupture Models

2021 ◽  
Author(s):  
Jaeseok Lee ◽  
Jung-Hun Song ◽  
Seongryong Kim ◽  
Junkee Rhie ◽  
Seok Goo Song
Keyword(s):  
Wave Propagation ◽  
Ground Motion ◽  
Korean Peninsula ◽  
Seismic Velocity ◽  
Ground Motions ◽  
Velocity Model ◽  
Wave Radiation ◽  
3D Seismic ◽  
Earthquake Scenarios ◽  
Large Earthquakes

ABSTRACT Accurate and practical ground-motion predictions for potential large earthquakes are crucial for seismic hazard analysis of areas with insufficient instrumental data. Studies on historical earthquake records of the Korean Peninsula suggest that damaging earthquakes are possible in the southeastern region. Yet classical ground-motion prediction methods are limited in considering the physical rupture process and its effects on ground motion in complex velocity structures. In this study, we performed ground-motion simulations based on rigorous physics through pseudodynamic source modeling and wave propagation simulations in a 3D seismic velocity model. Ensembles of earthquake scenarios were generated by emulating the one- and two-point statistics of earthquake source parameters derived from a series of dynamic rupture models. The synthetic seismograms and the distributions of simulated peak ground velocities (PGVs) were compared with the observations of the 2016 Mw 5.4 Gyeongju earthquake in the Korean Peninsula. The effects of surface-wave radiation, rupture directivity, and both local and regional amplifications from the 3D wave propagation were reproduced accurately in the spatial distribution of simulated PGVs, in agreement with the observations from dense seismic networks by mean log residuals of −0.28 and standard deviations of 0.78. Amplifications in ground motions were found in regions having low crustal velocities and in regions of constructive interference from the crustal shear-wave phases associated with postcritical reflections from the Moho discontinuity. We extended the established approach to earthquake scenarios of Mw 6.0, 6.5, and 7.0, at the same location, to provide the distribution of ground motions from potential large earthquakes in the area. Although we demonstrate the value of these simulations, improvements in the accuracy of the 3D seismic velocity model and the scaling relationship of the source models would be necessary for a more accurate estimation of near-source ground motions.

scholarly journals A Numerical Model for Simulating Ground Motions for the Korean Peninsula

2020 ◽  
Vol 10 (4) ◽  
pp. 1254 ◽  
Author(s):  
Sang Whan Han ◽  
Hyun Woo Jee
Keyword(s):  
Korean Peninsula ◽  
Ground Motions ◽  
Focal Depth ◽  
Economic Loss ◽  
Ground Motion Model ◽  
Proposed Model ◽  
Moderate Seismic Regions ◽  
A Site ◽  
Simulated Ground Motions ◽  
The City

Ground motions are used as input for the response history analyses of a structure. However, the number of ground motions recorded at a site located in low-to-moderate seismic regions such as the Korean Peninsula is few. In this case, artificial ground motions need to be used, which can reflect the characteristics of source mechanism, travel path, and site geology. On 15 November, 2017, the Pohang earthquake, with a magnitude of 5.4 and a focal depth of 9 km, occurred near the city of Pohang. This earthquake caused the most significant economic loss among the earthquakes that occurred in the Korean Peninsula. During the Pohang earthquake, valuable ground motions were recorded at stations distributed in the Korean Peninsula. In this study, a ground motion model is proposed based on ground motions recorded during the 2017 Pohang earthquake. The accuracy of the proposed model is verified by comparing measured and simulated ground motions at 111 recording stations.

China's Policy toward the Korean Peninsula

Asian Survey ◽  
1992 ◽  
Vol 32 (12) ◽  
pp. 1137-1156 ◽  
Author(s):  
Jia Hao ◽  
Zhuang Qubing
Keyword(s):  
Korean Peninsula
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