Seismic evidence for reverse activation of a paleo-rifting system in the East Sea (Sea of Japan)

Choi, Hoseon; Hong, Tae Kyung; He, Xiaobo; Baag, Chang‐Eob

doi:10.1016/j.tecto.2011.12.023

Cited by 70 publications

(45 citation statements)

References 45 publications

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“…The ambient regional stress field around the Korean Peninsula is N75°E-directional compression ( Fig. 1(c); Choi et al (2012)). The magnitude of the regional stress field is set to be 65 bars (Junn et al, 2002).…”

Section: Coulomb Stress Change and Induced Tension Fieldmentioning

confidence: 99%

“…The best-fit focal depth is searched from 1 to 20 km. The focal mechanism solutions of earthquakes before the megathrust are collected from early studies for comparison with those after the megathrust (Jun, 1991;Cipar, 1996;Park et al, 2007;Choi et al, 2012;Hong and Choi, 2012; Fig. 7).…”

Section: Temporal Concentration Of Moderate-size Earthquakesmentioning

confidence: 99%

“…Major cities with high populations are placed in intraplate regions where lithostatic stress induces diffused shallow seismicity (Sykes, 1978;Mooney et al, 2012;Choi et al, 2012;Hong and Choi, 2012). Stable intraplate regions display characteristics of low seismicity rates and long recurrence intervals.…”

Section: Introductionmentioning

confidence: 99%

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Long-term evolution of intraplate seismicity in stress shadows after a megathrust

Hong

Lee

Houng

2015

Physics of the Earth and Planetary Interiors

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Section: Coulomb Stress Change and Induced Tension Fieldmentioning

confidence: 99%

Section: Temporal Concentration Of Moderate-size Earthquakesmentioning

confidence: 99%

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Long-term evolution of intraplate seismicity in stress shadows after a megathrust

Hong

Lee

Houng

2015

Physics of the Earth and Planetary Interiors

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“…It is known that strike-slip earthquakes are dominant on the Korean Peninsula Hong and Choi, 2012). However, thrustal earthquakes caused by reverse activation of paleo-rifting structures occur in a region off the southeast coast (Hong and Kang, 2009;Choi et al, 2012). The paleo-rifting structures are associated with the East Sea opening.…”

Section: Tectonics and Seismicitymentioning

confidence: 99%

“…Earthquakes occur in weak media, and keep the media weak. Thus, it is often observed that earthquakes are clustered in certain weak zones and structures (e.g., Liu and Zoback, 1997;Gangopadhyay and Talwani, 2003;Choi et al, 2012;Hong and Choi, 2012), and a long-period correlation between instrumental and historical earthquakes is well observed (e.g., Musson, 1998).…”

Section: Validation Testmentioning

confidence: 99%

Probabilistic Analysis of the Korean Historical Earthquake Records

Houng

Hong

2013

Bulletin of the Seismological Society of America

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Seismic-hazard assessment for earthquakes with long recurrence intervals requires long earthquake records. Historical records for seismic damage can complement instrumental earthquake records, which is particularly useful for low-seismicity regions. Uncertainty in epicenters and magnitudes, however, hinders the full use of historical earthquake records. A probabilistic method to determine the epicenters of historical events is presented. The epicenters of historical events are determined probabilistically considering the nature of seismicity such that the spatial distribution of seismicity is nearly stationary with time in a constant tectonic environment. The probabilities for historical events to have occurred at given locations can be calculated using an instrumental seismicity density function and a distance-dependent weighting function. A location is selected randomly from a set of candidate source locations, of which probabilities are greater than a given prescribed value. The epicentral seismic intensity for the determined source location is calculated using an intensity-distance relationship. The magnitude is determined using an intensity-magnitude relationship. The method is verified with analysis of seismic intensity data for earthquakes in California. The method is applied to an ∼1900 year long Korean historical seismic record, and the magnitudes of historical earthquakes are estimated. The Gutenberg-Richter b values for the historical events are determined to be 0.73. It is observed that the northwestern and southern peninsula, and the southeastern offshore region have high seismic-hazard potentials.

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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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Seismic evidence for reverse activation of a paleo-rifting system in the East Sea (Sea of Japan)

Cited by 70 publications

References 45 publications

Long-term evolution of intraplate seismicity in stress shadows after a megathrust

Long-term evolution of intraplate seismicity in stress shadows after a megathrust

Probabilistic Analysis of the Korean Historical Earthquake Records

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

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Seismic evidence for reverse activation of a paleo-rifting system in the East Sea (Sea of Japan)

Cited by 70 publications

References 45 publications

Long-term evolution of intraplate seismicity in stress shadows after a megathrust

Long-term evolution of intraplate seismicity in stress shadows after a megathrust

Probabilistic Analysis of the Korean Historical Earthquake Records

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

Contact Info

Product

Resources

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