Epicenter relocation of two 2013 earthquake sequences in the Yellow Sea, Korea, using travel-time double-differences and Lg-wave cross-correlation

Son, Miwon; Shin, Jehyun; Kim, Geunyoung; Cho, Chang Soo

doi:10.1007/s12303-014-0038-2

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…We used the maximum CC and corresponding time lag, for both hypocenter relocation and further event associations, based on hierarchical waveform clustering. This cross-correlation approach has been successfully applied to earthquake sequences in the Korean Peninsula in the past (Han et al, 2019;Son et al, 2015Son et al, , 2018.…”

Section: Methodsmentioning

confidence: 99%

“…selecting a master event (Harris, 1991;Son et al, 2015;West, 2013). We applied this method to the waveforms of 134 events (M L > 2.0; Figure S3 for 280 events M L > 1.5) recorded at a station (CHS)~25 km northwest of the source area, where the event station direction corresponds to the maximum P-wave energy radiation from the mainshock among close stations.…”

Section: Methodsmentioning

confidence: 99%

“…The dendrogram was constructed by placing similar waveforms close together, with branch heights corresponding to one minus the average CC of the subentries (Figure S2). Therefore, we could determine subsets of similar waveforms by cutting the dendrogram at a specific height (i.e., clustering threshold) without considering affinities between event locations or arbitrarily selecting a master event (Harris, 1991; Son et al, 2015; West, 2013). We applied this method to the waveforms of 134 events (M L > 2.0; Figure S3 for 280 events M L > 1.5) recorded at a station (CHS) ~25 km northwest of the source area, where the event station direction corresponds to the maximum P ‐wave energy radiation from the mainshock among close stations.…”

Section: Methodsmentioning

confidence: 99%

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Partitioned Fault Movement and Aftershock Triggering: Evidence for Fault Interactions During the 2017 M_w 5.4 Pohang Earthquake, South Korea

et al. 2020

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The 2017 Pohang earthquake (M w 5.4) is the largest earthquake associated with fluid injection activities. We report new characteristics of the earthquake and propose a dislocation-type model explaining previously reported observations. We identify fault geometry by relocating the hypocenters of 1,132 events that occurred during the first 3 months and then resolve their source regions as the northern, central, and southern patches, based on event groups with similar waveforms. The spatial features of these similar waveform groups, in addition to our obtained source mechanisms, indicate that oblique contraction is prevalent in the source region: Reverse faulting dominates the southern fault and the deeper part of the central fault; near-parallel strike-slip sense controls the northern fault and the shallower part of the central fault. Furthermore, we identify a migrating aftershock pattern that matches the fluid diffusion process along both sides of the northern and central faults. This observation suggests the interconnection of the two faults, allowing fluid transport, and implies mainshock coseismic movement along the fault intersection. The coseismic slip of the fault intersection can induce a fault-valve process, which explains the aftershock migration pattern along the two intersecting faults. The proposed fault interaction accounts for the previously reported uplift between the two intersecting faults and successfully reproduces the non-double-couple mechanism of the mainshock. Our results raise the question of fluid-faulting interactions in the aftershock seismicity of the Pohang earthquake, and the complex fault movement provides insight into the rupture process that allowed the Pohang earthquake runaway. The Pohang earthquake was characterized by a full moment tensor with a large non-double-couple component, which implies the failure of multiple faults with different senses of slip (Grigoli et al., 2018). The complexity of the rupture process of the earthquake was also mentioned by Song and Lee (2019), who reported a local concentration of coseismic deformation northeast of the epicenter. Kim et al. (2019) reported geometry

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Partitioned Fault Movement and Aftershock Triggering: Evidence for Fault Interactions During the 2017 M_w 5.4 Pohang Earthquake, South Korea

et al. 2020

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The 2022 Goesan earthquake of the moment magnitude 3.8 along the buried fault in the central Korean Peninsula

Lim,

Cho,

Son

2024

J Seismol

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On October 28, 2022, a moment magnitude (Mw) 3.8 earthquake occurred in Goesan, South Korea, typically characterized as a stable continental region. Herein, we analyze 42 earthquakes, including the Mw 3.8 earthquake, the largest foreshock (Mw 3.3), which preceded the mainshock by 17 s, and the largest aftershock (Mw 2.9). The primary aim of this study is to identify interactions among the seismic events. To this end, we utilized the permanent seismic networks with the closest station at 8.3 km from the epicenter, and the temporary network deployed eight hours after the mainshock’s occurrence. Relocation results delineate that the mainshock occurred at the southeastern tip of the hypocenter distribution of three foreshocks, trending west-northwest–east-southeast. The aftershocks form an overall spatially diffused seismic pattern that propagates toward both ends of the inferred lineament in the downdip direction. The rupture directivity of the mainshock, along with waveform similarity across the mainshock and foreshocks, confirms the inferred geometry, corresponding well with the focal mechanisms of the mainshock and the largest foreshock. We demonstrate that the change in Coulomb failure stress (ΔCFS) by the largest foreshock was positive where the mainshock occurred and that the mainshock generated ΔCFS capable of triggering the propagation of the aftershocks.

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Spatiotemporal patterns of the 2020 Haenam earthquake sequence, South Korea: lineament and migration implying fluid-driven earthquake swarm

et al. 2020

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Epicenter relocation of two 2013 earthquake sequences in the Yellow Sea, Korea, using travel-time double-differences and Lg-wave cross-correlation

Cited by 10 publications

References 23 publications

Partitioned Fault Movement and Aftershock Triggering: Evidence for Fault Interactions During the 2017 M_w 5.4 Pohang Earthquake, South Korea

Partitioned Fault Movement and Aftershock Triggering: Evidence for Fault Interactions During the 2017 M_w 5.4 Pohang Earthquake, South Korea

The 2022 Goesan earthquake of the moment magnitude 3.8 along the buried fault in the central Korean Peninsula

Spatiotemporal patterns of the 2020 Haenam earthquake sequence, South Korea: lineament and migration implying fluid-driven earthquake swarm

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Epicenter relocation of two 2013 earthquake sequences in the Yellow Sea, Korea, using travel-time double-differences and Lg-wave cross-correlation

Cited by 10 publications

References 23 publications

Partitioned Fault Movement and Aftershock Triggering: Evidence for Fault Interactions During the 2017 Mw 5.4 Pohang Earthquake, South Korea

Partitioned Fault Movement and Aftershock Triggering: Evidence for Fault Interactions During the 2017 Mw 5.4 Pohang Earthquake, South Korea

The 2022 Goesan earthquake of the moment magnitude 3.8 along the buried fault in the central Korean Peninsula

Spatiotemporal patterns of the 2020 Haenam earthquake sequence, South Korea: lineament and migration implying fluid-driven earthquake swarm

Contact Info

Product

Resources

About

Partitioned Fault Movement and Aftershock Triggering: Evidence for Fault Interactions During the 2017 M_w 5.4 Pohang Earthquake, South Korea

Partitioned Fault Movement and Aftershock Triggering: Evidence for Fault Interactions During the 2017 M_w 5.4 Pohang Earthquake, South Korea