Depth‐Dependent Crustal Scattering Attenuation Revealed Using Single or Few Events in South Korea

Rachman, Asep Nur; Chung, Tae Woong

doi:10.1785/0120150351

Cited by 11 publications

(1 citation statement)

References 41 publications

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“…was used as the velocity model with S-wave velocities of 3.29, 3.45, 3.85, and 4.55 km/s separated at depths of 5.1, 16.7, and 31.9 km. This model showed the smallest residuals among the four models(Havskov and Ottemöller 1999;Rachman and Chung 2016) for the relocation of 799 aftershocks associated with the 2017 M 5.5 earthquake (Figure S2). The study area is an inland region between 35.5 -36.9 ºN and 128.5 -129.5 ºE, and has a crustal depth of 50 km.…”

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Seismic Scatter Associated with Earthquakes that Ended a Quiescent Period in Southeastern Korea

Iqbal

Chung

Nam

2020

Preprint

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Two recent hazardous earthquakes ( M 5.8 and 5.5) in southeastern Korea were the largest instrumentally recorded inland events after an abnormally long, seismically quiet, period. In this study, we used coda envelope tomography to observe the heterogeneities related to active faults, which can, in turn, help mitigate seismic hazard in the area. However, this tomography was not able to detect faults in the intraplate region. By separating the periods before and after the M 5.8 earthquake, we analyzed 225 and 204 seismograms obtained from 127 and 86 events, respectively. Both periods showed time-varying heterogeneity correlated with fault activity. Adding 446 seismograms from 235 aftershocks of the two events to the analysis showed us a heterogenous structure that closely correlated to the active faults where the recent earthquakes originated.

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confidence: 98%