Chapter 11 Imaging Inhomogeneous Structures in the Earth by Coda Envelope Inversion and Seismic Array Observation

Nishigami, K.; Matsumoto, Satoshi

doi:10.1016/s0065-2687(08)00011-3

Cited by 2 publications

(1 citation statement)

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“…Note that the depth of layers is represented as three pairs of circles to which each block belongs, where the center corresponds to the middle circle of the three pairs. As the heterogeneous structure identified by this study was mainly the surface layer and upper crust (Nishigami 1991;Nishigami and Matsumoto 2008), the RSCs showed a smaller and narrower range in variation in deeper layers, i.e., layers 7-9 occurred in only restricted areas and layer 10 had none (Figures S5).…”

Section: Analytical Proceduresmentioning

confidence: 72%

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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Section: Analytical Proceduresmentioning

confidence: 72%