Imaging the graben structure in the deep basin with a microtremor profile crossing the Yinchuan City

Zhao, Boming; Xie, Xiaofeng; Chai, Zhifang; Ma, Hongyu; Xu, Xiwei; Du, Pengfei; Yin, Wang; Jin, Tao

doi:10.1088/1742-2132/4/3/s08

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…The sediments on this profile appear to dip to the east, and they are thickest in the center of the basin, between the Luhuatai and Yinchuan‐Pingluo Faults (see Figure b). On the basis of this, and other unpublished profiles, a number of authors have drawn similar interpretive cross sections [e.g., Zhang et al , ; He et al , ; Zhao et al , ; Lei et al , and Lei et al , ].…”

Section: Tectonic Settingsupporting

confidence: 59%

A major, intraplate, normal‐faulting earthquake: The 1739 Yinchuan event in northern China

et al. 2016

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A large continental normal‐faulting earthquake occurred in the Yinchuan Graben in northern China on 3 January 1739. This event is of significant interest for two reasons. First, it has been suggested on the basis of historical records of shaking that this was a magnitude 8.0 event. If this is true, the 1739 earthquake would be one of the largest continental normal‐faulting earthquakes ever recorded, and this should prompt us to consider the factors contributing to its unusual size. Second, there has been some debate in the literature about the causative structure, with at least three different faults posited as the seismogenic source. We use five 14C ages to date a series of scarps on the East Helanshan Fault, which lies to the west of the graben, and bracket the scarp formation to the last 350 years. We use high‐resolution, stereo imagery from the Pleiades satellites to build a 1 to 2 m resolution DEM of the fault and combine this with field observations to map the East Helanshan rupture in detail. We then construct a throw distribution, determine the slip vector azimuth, and reassess the earthquake magnitude using simple scaling relationships. We conclude that the 1739 earthquake occurred on the East Helanshan Fault, had a rupture length of approximately 87 km, a maximum throw of 5.1 m, and an average throw of 3.0 m, yielding a best estimate magnitude in the range Mw 7.1 to Mw 7.6. We suggest that the previous magnitude estimates are biased by enhanced shaking of the sediments within the Yinchuan Graben.

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Section: Tectonic Settingsupporting

confidence: 59%

A major, intraplate, normal‐faulting earthquake: The 1739 Yinchuan event in northern China

et al. 2016

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“…We adopted isotropic layered models that are composed of 50 layers with 1-km thickness of each layer overlying a halfspace. The S-wave velocity in each layer is referred to deep seismic sounding profiles and tomography results (Zhao et al, 2007;Li et al, 2002;Jin et al, 1999; The Committee Compiled Earth Science Profiles, SSB, 1992), and P-wave velocity and density are computed from S-wave velocity based on empirical formulas. Since the maximum period we measured for group …”

Section: Group Velocity Distributions and Shear Wave Velocity Structuresmentioning

confidence: 99%

Rayleigh wave group velocity distribution in Ningxia

Liu

et al. 2011

J. Earth Sci.

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In this article, seven months ambient noise data and 10 events recorded at seven digital stations from the Ningxia (宁夏) regional seismic network and 5 500-t controlled source explosion data recorded by 15 temporary and 7 permanent seismic stations are used to measure dispersion curves of fundamental mode Rayleigh waves. The study region was divided into grids with 0.1°×0.1°; group velocity distributions of Rayleigh waves from 6-22 s were determined with the Occam's inversion technique. These velocity distribution maps show the lateral velocity variations in the study area, and the velocity structures are correlated with surface geology and tectonic units. The Yinchuan (银川) basin is clearly featured with low velocities, and the Helan (贺兰) Mountain and southern mountain areas are revealed with high velocities.

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“…The merits and demerits of this method are discussed by several workers and has been used extensively as a low cost tool for site characterization in estimating the resonant frequency and thickness of sedimentary layers, viz. Field and Jacob (1993), Parolai and Galiana-Merino (2006), Bonnefoy-Claudet et al (2006), Garcia-Jerez et al (2006), Zhao et al (2007), Nakamura (2008), Bard (2008), Pilz et al (2009), Lunedei and Albarello (2010), and Sánchez-Sesma et al 2011.…”

Section: Microtremor Studiesmentioning

confidence: 99%

“…The assessment was quicker than the conventional indirect methods. The microtremor method has been used successfully to map subsurface rheological boundaries based on strong acoustic impedance along contrasting density at sediment/rock interphases at shallow depths and across fault zones (Kanai 1957;Yamanaka et al 1994;Ibs-Vonseht and Wohlenberg 1999;Delgado et al 2000a, b;Parolai et al 2002;Garcia-Jerez et al 2006;Guéguen et al 2006;Zhao et al 2007;Dinesh et al 2010;Rošer and Gosar 2010;Sukumaran et al 2011;Paudyal et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Subsurface profiling of granite pluton using microtremor method: southern Aravalli, Gujarat, India

Joshi

Sant

Parvez

et al. 2017

Int J Earth Sci (Geol Rundsch)

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22 stations identified as the phyllite and quartzite boundary. The proposed equation describing frequency-depth relationship between granite and overlaying regolith matches with those already published in the literature. The morphology of granite pluton highlights the rootless character of Champaner Group showing sharp discordance with granitic pluton. The findings of manifestation of pluton at a shallower depth imply a steep easterly plunge within the Champaner metasediments, whereas signature of pluton at a deeper level implies a gentle westerly plunge. The present method enables to assess how granite emplacement influences the surface structure.

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Imaging the graben structure in the deep basin with a microtremor profile crossing the Yinchuan City

Cited by 10 publications

References 5 publications

A major, intraplate, normal‐faulting earthquake: The 1739 Yinchuan event in northern China

A major, intraplate, normal‐faulting earthquake: The 1739 Yinchuan event in northern China

Rayleigh wave group velocity distribution in Ningxia

Subsurface profiling of granite pluton using microtremor method: southern Aravalli, Gujarat, India

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