Seismotectonics of the Taiwan Shoal region in the northeastern South China Sea: Insights from the crustal structure

Wan, Keshu; Sun, Jianbao; Xu, H.; Xie, Xiao‐Bi; Xia, Shaohong; Zhang, Xiang; Cao, Jianyu; Zhao, Fang; Fan, Chun‐An

doi:10.1007/s11802-018-3443-8

Cited by 3 publications

(1 citation statement)

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“…Figure 11b shows that the model has a good ray coverage with the ray coverage of most areas exceeding 20-40 hits. To better determine the resolution of the inversion model, we imposed a checkerboard pattern on the model [28]. This grid pattern had a width of 15-25 km in the upper crust, 20-40 km in the lower crust, and the vertical dimension was constrained by the model interface.…”

Section: Inversion Results and Analysismentioning

confidence: 99%

Travel-Time Inversion Method of Converted Shear Waves Using RayInvr Algorithm

et al. 2021

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The detailed studies of converted S-waves recorded on the Ocean Bottom Seismometer (OBS) can provide evidence for constraining lithology and geophysical properties. However, the research of converted S-waves remains a weakness, especially the S-waves’ inversion. In this study, we applied a travel-time inversion method of converted S-waves to obtain the crustal S-wave velocity along the profile NS5. The velocities of the crust are determined by the following four aspects: (1) modelling the P-wave velocity, (2) constrained sediments Vp/Vs ratios and S-wave velocity using PPS phases, (3) the correction of PSS phases’ travel-time, and (4) appropriate parameters and initial model are selected for inversion. Our results show that the vs. and Vp/Vs of the crust are 3.0–4.4 km/s and 1.71–1.80, respectively. The inversion model has a similar trend in velocity and Vp/Vs ratios with the forward model, due to a small difference with ∆Vs of 0.1 km/s and ∆Vp/Vs of 0.03 between two models. In addition, the high-resolution inversion model has revealed many details of the crustal structures, including magma conduits, which further supports our method as feasible.

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Section: Inversion Results and Analysismentioning

confidence: 99%