Neotectonic Movement and Seismic Activity in the East China Sea

Zhang, Lifang; Xu, Jian; Peng, Yanju

doi:10.2112/si73-075.1

Cited by 1 publication

(1 citation statement)

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“…In contrast to the other three segments, the western Yilan-Yitong Fault Zone (YYFZ) had an earthquake with a maximum modern instrumental magnitude of M 5.8 in 1963 in Luobei County near the China-Russia border area. In contrast, the eastern Dunhua-Mishan Fault Zone (DDFZ) connects a series of Neogene basalt and Quaternary basins without active faults at the surface (Zhang and Wang, 1995;Zhang et al, 2014;Yu et al, 2015a;2015b;Yu, 2016) (Figure 1). The latest deep seismic reflections across the northern part of the structure, the location of which is marked with a black dashed line in Figure 1B, reveal that the faults formed a large-scale flower structure with a distinctive Moho offset in the middle (Xu et al, 2017;Zheng et al, 2022) (Figure 2).…”

Section: Geologic Settingmentioning

confidence: 99%

Late Quaternary right-lateral slip rate along the Tangyuan segment of the Yilan–Yitong Fault Zone on the NE China Plain

Yu,

Yin,

Yang

et al. 2024

Front. Earth Sci.

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The slip rate of strike-slip active faults is crucial for fault rupture behavior analysis and seismic hazard assessment. Although many segments of the Yilan–Yitong Fault Zone (YYFZ) in NE China have been strongly deformed since the late Quaternary, little progress has been made on its slip rate. With the help of high-resolution satellite images, detailed field investigations, seismic reflections, and Quaternary chronological dating, we mainly studied the late Quaternary right-slip rate of the YYFZ. Field investigations revealed an ∼15 km long by ∼1–2 m high-surface scarp belt extending along the Tangyuan graben interior, with a series of sag ponds and small parallel bulges. Research has revealed that the most recent paleoearthquake (∼M 7.0) occurred between 2,800± 600 a BP and 1,700 ± 200 a BP, with evidence of coseismic surface rupture. The T2 terrace abandonment age of the Heijin River is approximately 55.13 ± 1.78 ka (OSL), and the maximum cumulative right-lateral offset may reach 110 ± 5 m. Thus, the maximum right-slip rate of the Tangyuan segment of the YYFZ since the late Quaternary is constrained to 1–2 mm/a according to the upper terrace model. This study suggests that the presence of a new fault in the basin interior merits more attention when assessing the influential surface range and earthquake potential along the YYFZ, and the features of “low tectonic loading rate, activity migration in space, and clustering in time separated by ten thousand years of seismic quiescence” observed along the YYFZ are highly important for earthquake model construction and tectonic deformation studies in stable continental regions (SCRs).

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Section: Geologic Settingmentioning

confidence: 99%