Activity Characteristic of the Two Buried Faults in Zhongwei Basin along the Northeastern Margins of Tibetan Plateau, China, by Means of Shallow Seismic and Composite Drilling Section Exploration

Liu, Chao; Lei, Qiyun; Du, Peng; Wu, Zhiqun; Li, Zeshan; Yu, Sihan; Yang, Shun; Wang, Yin

doi:10.3390/app122312074

Cited by 2 publications

(3 citation statements)

References 16 publications

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“…The depth of the boreholes ranges from 90 to 129 m, with a cumulative footage of 691 m. The length of the drilling profile B-B is close to 765 m and the cumulative footage is 724 m, including 6 boreholes with depths ranging from 111 m to 129 m. From south to north, the boreholes are named ZK12, ZK11, ZK4, ZK13, ZK15 and ZK6, with spacing of 277 m, 157 m, 74 m, 137 m and 120 m. During the construction, the "folding method" was used to determine the layout of the boreholes. This method approaches the fault from sides to center, emphasizing dynamic construction and analysis [19,20]. Each column of the boreholes was completely photographed and well logged, and the coordinates and elevations of the boreholes were obtained using Global Position System Real-Time Kinematic (GPS RTK) measurements.…”

Section: Drillingmentioning

confidence: 99%

“…the construction, the "folding method" was used to determine the layout of the boreholes. This method approaches the fault from sides to center, emphasizing dynamic construction and analysis [19,20]. Each column of the boreholes was completely photographed and well logged, and the coordinates and elevations of the boreholes were obtained using Global Position System Real-Time Kinematic (GPS RTK) measurements.…”

Section: Drillingmentioning

confidence: 99%

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Late Quaternary Activity Studies on the Lintong–Chang’an Fault Zone in the Weihe Graben, Central China, Using Combined Techniques

Wang,

Tian,

Chong

et al. 2023

Applied Sciences

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The Lintong–Chang’an Fault Zone (LCFZ) is an important active structure in the Weihe Graben (central China). The study on the activity of the LCFZ is not only of great significance to explore the regional tectonic mechanism, but also has practical value in urban seismic mitigation and disaster relief. In this study, based on high-resolution remotely sensed imagery, shallow seismic reflection survey, borehole data and excavation of a foundation pit, we determined the distribution and activity of the Wangjiabian–Houjiawan fault (a branch fault of the LCFZ) in the Shaoling Loess Tableland. Combined with previous studies, we further inferred that the vertical displacements were 0–6 m along the LCFZ, but most displacements were around 1 m. Furthermore, there are eight locations where no displacements have been found in the Late Pleistocene strata. The offsets on the fault zone since the Late Pleistocene display a wave-like pattern, which is unrelated to the regional topographic expression. Compared to other faults in the Weihe Graben, the activity of the LCFZ in vertical component is relatively weak, implying a possible strike–slip motion. In addition, a major active fault may exist on the northwest side of this fault zone, bearing part of the fault motion in this region.

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Section: Drillingmentioning

confidence: 99%

Section: Drillingmentioning

confidence: 99%

Late Quaternary Activity Studies on the Lintong–Chang’an Fault Zone in the Weihe Graben, Central China, Using Combined Techniques

Wang,

Tian,

Chong

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

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“…At the same time, some borehole and high-density electrical data were also collected. Among them, 25 boreholes and four high-density electrical sections were drilled in the active-fault detection project [21], one borehole was drilled in the risk-survey project, and 20 holes and 8 high-density electrical sections were drilled in the seismic-safety evaluation and seismic-microzoning project. In this work, the basin strata deposition was determined.…”

Section: Seismology and Geology Conditions Of The Zhongwei Basinmentioning

confidence: 99%

Study on the Seismic Effect of the Pebble Soil Site in the Zhongwei Basin

Yang

Han²,

Lei

et al. 2022

Applied Sciences

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Based on a large amount of drilling and geophysical exploration work in the Zhongwei Basin, and combined with the collected borehole data of a seismic safety assessment, this paper summarizes and builds 16 typical pebble soil layer calculation models. The effects of the thickness of the pebble layer, the thickness of the overlying silty clay, the top interface of the pebble layer on the peak acceleration and the response spectrum of the site seismic response were analyzed using the equivalent linearization method of the one-dimensional soil layer seismic response. The analysis results showed that the variation in pebble layer thickness had no obvious effect on the peak acceleration of the ground surface under different inputs; the influence of the pebble layer thickness on the ground acceleration response spectrum was primarily concentrated in the middle/high-frequency band of 0.2–0.6 s. Within this range, the acceleration response spectrum of the site with a 30 m pebble layer thickness was small, and the response spectrum curve showed a “trough” shape with a certain “weak isolation” effect. Under the same pebble layer thickness, the upper ground surface peak acceleration with a silty clay layer thickness increased with the increase in the central basin pebble soil field, where a short cycle of the seismic wave amplification effect was more obvious. The response spectrum peak period points were within 0.1–0.2 s and were influenced by the action of rare earthquakes. Moreover, the response spectrum curve showed a more obvious phenomenon of “twin peaks”, and the second peak point appeared in the period of 0.5–0.7 s. With the increase in the input intensity, the PGA amplification ratio of the pebble-top interface was significantly smaller than that of the site surface; under different intensities of input, the acceleration response spectrum of the pebble-top interface showed a “trough” phenomenon that was lower than the bedrock input at approximately 0.1 s. Under the action of rare ground motion, the acceleration response spectrum curve of the pebble-top interface showed a “double peak” phenomenon, and within 0.24–0.4 s, the spectrum value was lower than the bedrock input, showing an obvious shock absorption and isolation effect. Under the action of an earthquake, the energy of the pebble-top interface was concentrated in the low-frequency range of 1.1–2.2 Hz, and the amplification effect was obvious. In the range of 8–10 Hz, the amplitude was lower than the bedrock input, and the seismic isolation effect was obvious.

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Activity Characteristic of the Two Buried Faults in Zhongwei Basin along the Northeastern Margins of Tibetan Plateau, China, by Means of Shallow Seismic and Composite Drilling Section Exploration

Cited by 2 publications

References 16 publications

Late Quaternary Activity Studies on the Lintong–Chang’an Fault Zone in the Weihe Graben, Central China, Using Combined Techniques

Late Quaternary Activity Studies on the Lintong–Chang’an Fault Zone in the Weihe Graben, Central China, Using Combined Techniques

Study on the Seismic Effect of the Pebble Soil Site in the Zhongwei Basin

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