Shallow Crustal Structures and Buried Active Faults Revealed by Seismic Reflection Profiles in the Northwest of Beijing Plain

Liu, Baojin; Hu, Peng; Chen, Yong; Zhang, Xian‐Kang; Su, Feng; Meng, Yongqi; Yang, Xiaoping; Yu, Shikai; Jin-hu, Shi; Kou, Kun‐Peng

doi:10.1002/cjg2.1404

Cited by 8 publications

(7 citation statements)

References 15 publications

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“…Thus, the Xiadian fault affects not only the geophysical characteristics (e.g., resistivity, geotherm, and crystalline basement) but also the Vp and Vs structures in DXH and DCS. A vertical geologic section near our A1–A2 profile shows clearly that the Nanyuan‐Tongxian fault (F32) and Xiadian fault have dislocated the strata below the cenozoic within 8 km depth (Lei et al., 2021). The buried depth of rocks is one of the factors affecting seismic wave velocity (Yao, 2006).…”

Section: Discussionmentioning

confidence: 89%

“…Blue line denotes the 1 km/s isodepth of Vs. Red line modified from Lei et al. (2021) denotes the gravity anomaly along profile A1–A2. FBS: Fengbo Sag; DXH: Daxing High; DCS: Dachang Sag.…”

Section: Shear‐wave Velocity Structure From Joint Inversion Methodsmentioning

confidence: 99%

“…As shown in Figure 1, the intersected faults in the plain are mainly distributed in the NE and NW directions. NE‐striking faults play a dominant role in the development of tectonic activity, and NW‐striking faults cut and reconstruct these NE‐striking faults (Lei et al., 2021; Y. Peng et al., 1981).…”

Section: Tectonic and Geological Settingmentioning

confidence: 99%

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Improved 3D Shallow‐Deep Vs Structure in Tongzhou, Beijing (China), Revealed by Dense Array Ambient Noise Tomography

Wei

Ding

et al. 2023

Earth and Space Science

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Shear‐wave velocity (Vs) structures can reveal the shallow sediment thickness and deep tectonic features of buried faults and geological units. They are important for reducing seismic and geological disasters in urban areas. Based on ambient noise data from the Tongzhou dense array (919 seismographic stations), we obtain a fine shallow‐deep (0–5 km) 3D Vs model, by jointly inverting the phase‐velocity dispersions of Rayleigh waves, including short‐period (0.3–2 s) multimode dispersions using the frequency‐Bessel transform method and the long‐period (2–6 s) fundamental‐mode dispersions using the fast marching method. Our results show that the Vs inhomogeneities agree well with the distribution of geological units. We use the 1 km/s isodepth of Vs as the reference thickness of quaternary sediments. Fengbo sag (FBS) and Dachang sag (DCS), which mainly show low velocity and density, have thick sediment thicknesses (approximately 550–600 and 320–420 m, respectively). The NE high‐velocity belt in Daxing high (DXH) has a thinner sediment thickness (∼230 m). Thus, FBS and DCS have a greater risk of earthquake hazards owing to the strong amplification effects of ground motion. Additionally, Vs distribution in the FBS, DCS, DXH, and Yanshan Fold Belt are spatially related to the medium density and buried faults (Nanyuan‐Tongxian, Daxing, and Xiadian faults). We infer that the Vs structures are associated with the controlling effects of these large normal faults and inhomogeneous strata density. The discontinuity of the NE high‐velocity belt in DXH probably results from the intense tectonic activity of Nankou‐Sunhe fault.

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Section: Discussionmentioning

confidence: 89%

Section: Shear‐wave Velocity Structure From Joint Inversion Methodsmentioning

confidence: 99%

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Improved 3D Shallow‐Deep Vs Structure in Tongzhou, Beijing (China), Revealed by Dense Array Ambient Noise Tomography

Wei

Ding

et al. 2023

Earth and Space Science

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“…Ground fissure can lead the ground and underground buildings to crack, the road surface to damage (Zhao et al, 2015;Xiong et al, 2017;Liu et al, 2019) and bring a lot of inconvenience for residents (Peng et al, 2007;Huang et al, 2010). A large number of surveys show that the ground fissure is not only the source of the earthquake but also the place where suffers from most seriously damage when earthquake happens (Liu et al, 2009;Zhang et al, 2011;Peng et al, 2012;Liu et al, 2018). Therefore, it is of great significance to take effective detection methods to find out ground fissure distribution characteristic.…”

Section: Introductionmentioning

confidence: 99%

Using 3D seismic exploration to detect ground fissure

Shi

Liu

Feng

et al. 2020

Adv. Geo-Energ. Res.

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As a kind of supergene geological phenomenon, ground fissure has brought great inconvenience to human life. In addition, it also has a close relationship with earthquake. However, it is very difficult to ascertain the extension depth of ground fissure since its concealment and uncertainty. In this paper, 3D seismic exploration is used to detect ground fissure in Shanxi Province of China. Specific parameters for seismic data acquisition, processing and interpretation are analysed. Firstly, seismic data acquisition method and its corresponding parameters are discussed. Small dose explosive sources and high frequency geophones are used. Small trace interval and appropriate fold are also adopted. Secondly, seismic data processing is processed from shot record to seismic profile. Multi-domain loop iteration de-noising is used to get high signal-to-noise ratio data. Accurate near surface model, interactive iteration and residual static correction are used to eliminate the impact of low velocity zone and the static correction problem. Large common middle point bin and small velocity analysis interval are used for high accuracy velocity spectrum analysis. The mute parameter of stretching distortion and the migration aperture are researched for shallow ground fissure detection. Thirdly, seismic data interpretation is processed to get ground fissure distribution. Fault enhanced filter is used to improve the signal-to-noise ratio effectively and the chimney cube is used to identify ground fissure automatically. Thus, the specific 3D seismic exploration method used in this paper is suitable for ground fissure detection.

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“…The Shunyi-Liangxiang fault trending NE40 • direction, dipping NW at angles 60 • ∼80 • is a normal fault that extends downward cutting through the Moho discontinuity. It was primarily active in the Mesozoic to Early Cenozoic epoch, while its north segment was active since Quaternary (Jiao et al, 2005;Liu et al, 2009). Striking in NW direction, inclining in SE direction with dip angles over 70 • , the Sunhe-Nankou fault is the largest buried normal fault with left slip in this region, which was still active since Quaternary (Jiao et al, 2005;Zhang et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

In‐Situ Stress Measurements and Slip Stability of Major Faults in Beijing Region, China

Qin

Zhang

Feng

et al. 2014

Chinese J of Geophysics

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In order to estimate the upper crustal stress state and slip stability of major faults after the Wenchuan Ms 8.0 earthquake, five boreholes, i.e., Pinggu, Shisanling, Xifengsi, Miyun, and Lisiguang Memorial Hall borehole ranging from 600 to 1000 m were drilled in Beijing region. Hydraulic fracturing method was used to conduct in-situ stress measurements in these five boreholes, and stress monitoring equipment was installed at appropriate depth and monitoring stations were constructed. Those data derived from the in-situ stress measurements reveal that the gradient coefficients of the maximum horizontal stresses and minimum horizontal stresses versus depth are 0.0328 and 0.0221, respectively; and the magnitudes of lateral pressure coefficient such as Kav, KHv and the ratios (K Hh ) of the maximum horizontal stress to minimum horizontal stress are consistent with previous studies. However, the ratios (µm) of the maximum horizontal shear stress to the average horizontal stress are relatively low. It is noted that the dominant direction of the maximum horizontal stress in Beijing region is ∼EW which is the same with the tectonic stress field of North China. However, sub-regional stress field induced by faults which shows deviation from the orientation of North China, has been also revealed. In addition, the stress regimes inferred from in-situ stress data imply that the maximum horizontal stress (σH) is the maximum principal stress (σ1), while the intermediate (σ2) and the minimum principal stress (σ3) show some variations. It is suggested that these variations may be caused mainly by the regional tectonic evolution and the activity of faults near the boreholes. Based on these characteristic parameters, we can point out that the maximum horizontal stress in the upper crust of Beijing region can be defined as dominant stress, while the horizontal shearing stress is relatively weak. Finally, slip stability of major faults in Beijing region is estimated according to Column friction criterion and Byerlee's law, together with the frictional coefficients being assumed to be 0.2, 0.4, 0.6 and 1.0. The results reveal that when the frictional coefficient ranges from 0.6 to 1.0, the recent crustal stress state of Beijing region does not yet reach the expected limit of fault slip. The stress values of the Xifengsi borehole will reach the expected limit when the frictional coefficient is weakened to 0.4, revealing that the Babaoshan fault stands chance of slipping; the Xiadian-Mafang fault and the Huangzhuang-Gaoliying fault will approach to the expected limit of slip and will stand chance of slipping under this hypothesis, but only with very low possibility. However, it should be pointed out that if the frictional coefficient is weakened to as low as 0.2, the major faults in Beijing region will be unstable and slip may occur under the present-day crustal stress state. Conclusions in this paper would be of great significance for studies on tectonic stress field and seismogeology in Beijing region, even North China.As a direct me...

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Shallow Crustal Structures and Buried Active Faults Revealed by Seismic Reflection Profiles in the Northwest of Beijing Plain

Cited by 8 publications

References 15 publications

Improved 3D Shallow‐Deep Vs Structure in Tongzhou, Beijing (China), Revealed by Dense Array Ambient Noise Tomography

Improved 3D Shallow‐Deep Vs Structure in Tongzhou, Beijing (China), Revealed by Dense Array Ambient Noise Tomography

Using 3D seismic exploration to detect ground fissure

In‐Situ Stress Measurements and Slip Stability of Major Faults in Beijing Region, China

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