3D crustal velocity structure beneath the broadband seismic array in the Gyeongju area of Korea by receiver function analyses

Lee, Dong Hun; Lee, Jung Mo; Cho, Hyun-Moo; Kang, Tae Cheon

doi:10.1016/j.tecto.2016.08.022

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…1c), ref. 45 observed a low velocity layer in the seismogenic zone (<15 km, ref. 46 ), with depths of 4 to 14 km.…”

Section: Resultsmentioning

confidence: 98%

“…Mantle degassing in the SeKP region illustrates that the fault zones appear to penetrate into the lithospheric mantle. The Moho depths of the SeKP region ranges between 26 and 32 km based on S-wave velocities 45 , with the seismogenic depth of 15 km (ref 46 ). Hence, the brittle-ductile transitions zone may be located at the depth of 15 km, which is consistent with the lower crustal thickness approximately ranging from 15 and 30 km (ref.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, the brittle-ductile transitions zone may be located at the depth of 15 km, which is consistent with the lower crustal thickness approximately ranging from 15 and 30 km (ref. 45 ). The ductile lower crust is thought to be impermeable for mantle-derived helium transport 7,8,44 .…”

Section: Resultsmentioning

confidence: 99%

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Mantle degassing along strike-slip faults in the Southeastern Korean Peninsula

Lee

Kim

Kagoshima

et al. 2019

Sci Rep

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On September 12, 2016, a ML 5.8 earthquake hit Gyeongju in the southeastern part of the Korean Peninsula (SeKP), although the area is known to be far from the boundary of the active plate. A number of strike-slip faults are observed in heavily populated city areas (e.g., Busan, Ulsan, Pohang, and Gyeongju). However, dissolved gases related to the active faults have rarely been studied despite many groundwater wells and hot springs in the area. Here we report new results of gas compositions and isotope values of helium and carbon dioxide (CO2) in fault-related fluids in the region. Based on gas geochemistry, the majority of gas samples are abundant in CO2 (up to 99.91 vol.%). Measured 3He/4He ratios range from 0.07 to 5.66 Ra, showing that the mantle contribution is up to 71%. The range of carbon isotope compositions (δ13C) of CO2 is from −8.25 to −24.92‰, showing mantle-derived CO2 is observed coherently where high 3He/4He ratios appear. The weakening of faults seems to be related to enhanced pressures of fluids containing mantle-derived helium and CO2 despite the ductile lower crust underneath the region. Thus, we suggest that the SeKP strike-slip faults penetrate into the mantle through ductile shearing.

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“…1c), ref. 45 observed a low velocity layer in the seismogenic zone (<15 km, ref. 46 ), with depths of 4 to 14 km.…”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%