Geodetic analysis of post-seismic crustal deformations occurring in South Korea due to the Tohoku-Oki earthquake

Kim, Dusik; Park, Kwan-Dong; Ha, Ji-Hyun; Sohn, Dong-Hyo; Won, Ji-Hye

doi:10.1007/s12205-016-0086-4

Cited by 13 publications

(23 citation statements)

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“…The megathrust earthquake coseismically displaced the Korean Peninsula by 2 to 5 cm in the direction of the epicenter [Baek et al, 2012;Kim and Bae, 2012;Ha et al, 2014;Hong et al, 2015;Houng et al, 2016]. Postseismic displacement has occurred in the Korean Peninsula for several years since the megathrust earthquake [Baek et al, 2012;Zhou et al, 2012;D. Kim et al, 2016].…”

Section: Introductionmentioning

confidence: 99%

The 12 September 2016M_L5.8 midcrustal earthquake in the Korean Peninsula and its seismic implications

Hong

Lee

Kim

et al. 2017

Geophysical Research Letters

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The seismicity in the Korean Peninsula has increased since the 2011 Mw9.0 Tohoku‐Oki megathrust earthquake. Two strike‐slip earthquakes with magnitudes of ML5.1 and 5.8 occurred in the southeastern Korean Peninsula on 12 September 2016. The two events occurred within 48 min. The ML5.8 earthquake was the largest event in the Korean Peninsula since 1978 when national seismic monitoring began. Both events produced strong high‐frequency ground motions. More than 500 aftershocks with local magnitudes greater than or equal to 1.5 followed the events for 2 months. An unreported subsurface strike‐slip fault with a dip of 65° to the east and a strike of N27°E was responsible for the earthquakes. The fault ruptured at depths of 11–16 km, resulting in a rupture plane of ∼26 km2. The aftershock distribution displayed horizontal streaks at a depth of ∼14 km, which was consistent with the focal mechanism solutions from long‐period waveform inversion. The number of aftershocks decreased exponentially with time. The two ML5.1 and 5.8 earthquakes produced regional Coulomb stress changes of −4.9 to 2.5 bar. The spatial distribution of the aftershocks correlated with the Coulomb stress changes. The peak dynamic stress induced by strong ground motions reached 14.2 bar. The groundwater levels changed coseismically in some regions of decreased static stresses. The earthquakes on previously unidentified faults raised attention for the potential seismic hazards by earthquakes with long recurrence intervals.

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Section: Introductionmentioning

confidence: 99%

The 12 September 2016M_L5.8 midcrustal earthquake in the Korean Peninsula and its seismic implications

Hong

Lee

Kim

et al. 2017

Geophysical Research Letters

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“…The postseismic displacements at shorter distances from the epicenter were generally larger than those at longer distances. The seismicity for earthquakes with magnitudes greater than the minimum magnitude (

M_{\min} = 2.5

) ensuring complete records increased after the megathrust earthquake (Hong et al, ; Kim et al, ). In addition, moderate size earthquakes increased after the megathrust earthquake (Hong et al, , ).…”

Section: Data and Megathrust Earthquake Effectsmentioning

confidence: 99%

“…The postseismic displacements decreased with time, lasting more than ∼1,000 days (Kim et al, ) and producing negative gradients in time. The postseismic displacements at shorter distances were larger than those at longer distances (Figure c).…”

Section: Data and Megathrust Earthquake Effectsmentioning

confidence: 99%

“…The peak lateral coseismic displacements reached ∼4.3 m in Northern Honshu and 2–5 cm on the Korean Peninsula (Baek et al, ; Hong et al, ; Simons et al, ). Postseismic displacements continued following the coseismic displacements (Kim et al, ; Sun et al, ; Tobita, ). These cumulative postseismic displacements after the megathrust earthquake were comparable to the coseismic displacements in the Korean Peninsula.…”

Section: Introductionmentioning

confidence: 99%

“…The 2011 M w 9.0 Tohoku‐Oki earthquake and its effects. (a) Lateral coseismic displacements (contours with solid lines) (Hong et al, ) and postseismic displacements over 3 years (arrows) (Kim et al, ) around the Korean Peninsula. A coseismic slip model is presented (Yagi & Fukahata, ).…”

Section: Introductionmentioning

confidence: 99%

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Seismic Velocity Changes in the Backarc Continental Crust After the 2011 M_w 9.0 Tohoku‐Oki Megathrust Earthquake

Hong

Lee

Chi

et al. 2017

Geophysical Research Letters

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The 2011 M w 9.0 Tohoku-Oki megathrust earthquake accompanied coseismic and postseismic displacements around the eastern Eurasian continental plate. Noise cross correlations produced transient seismic waveforms along interstation paths in the Korean Peninsula. We measured the traveltime changes of the fundamental mode Rayleigh waves over the range of 0.03-0.08 Hz after the megathrust earthquake. The temporal seismic velocity changes in the lower crust were assessed from the traveltime changes. The traveltimes increased instantly after the megathrust earthquake and were gradually recovered over several hundreds to thousands of days. The instant shear wave velocity decreases ranged between 0.731 (±0.057)% and 4.068 (±0.173)%. The temporal medium perturbation might be caused by the transient uniaxial tensional stress due to the coseismic and postseismic displacements. The medium properties may be recovered by progressive stress field reconstruction.

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Contemporary deformation and strain analysis in South Korea based on long-term (2000–2018) GNSS measurements

Ansari

Bae

2020

Int J Earth Sci (Geol Rundsch)

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Geodetic analysis of post-seismic crustal deformations occurring in South Korea due to the Tohoku-Oki earthquake

Cited by 13 publications

References 10 publications

The 12 September 2016M_L5.8 midcrustal earthquake in the Korean Peninsula and its seismic implications

The 12 September 2016M_L5.8 midcrustal earthquake in the Korean Peninsula and its seismic implications

Seismic Velocity Changes in the Backarc Continental Crust After the 2011 M_w 9.0 Tohoku‐Oki Megathrust Earthquake

Contemporary deformation and strain analysis in South Korea based on long-term (2000–2018) GNSS measurements

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Geodetic analysis of post-seismic crustal deformations occurring in South Korea due to the Tohoku-Oki earthquake

Cited by 13 publications

References 10 publications

The 12 September 2016ML5.8 midcrustal earthquake in the Korean Peninsula and its seismic implications

The 12 September 2016ML5.8 midcrustal earthquake in the Korean Peninsula and its seismic implications

Seismic Velocity Changes in the Backarc Continental Crust After the 2011 Mw 9.0 Tohoku‐Oki Megathrust Earthquake

Contemporary deformation and strain analysis in South Korea based on long-term (2000–2018) GNSS measurements

Contact Info

Product

Resources

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The 12 September 2016M_L5.8 midcrustal earthquake in the Korean Peninsula and its seismic implications

The 12 September 2016M_L5.8 midcrustal earthquake in the Korean Peninsula and its seismic implications

Seismic Velocity Changes in the Backarc Continental Crust After the 2011 M_w 9.0 Tohoku‐Oki Megathrust Earthquake