Slip Distribution and Footwall Topography of the Yanggao‐Tianzhen Fault (Northern Shanxi Graben): Implications for the Along‐Strike Variations in Fault Activity and Regional Deformation

Abstract

Slip rate is a fundamental component for understanding the tectonic activity of active faults (Cowie et al., 2012). Existing studies suggest that slip rates along a fault zone can vary in space and time (e.g.

Direct Evidence for Dextral Shearing in the Shanxi Graben System: Geologic and Geomorphologic Constraints From the North Liulengshan Fault

“…Following the approach of Thompson et al (2002), Rood et al (2011), Hughes et al (2018), andLuo et al (2021), we calculate fault slip rates and their uncertainties by carrying out Monte Carlo simulations in a worksheet-based software package, Oracle Crystal Ball (https://www.oracle.com/middleware/technologies/crystalball.html). This was done by assigning each input variable a probability density function that describes the uncertainty in that variable.…”

“…For each of the first three variables, we assigned normal probability distribution functions (PDFs) (defined by the mean and standard deviation). For the last variable, we used a trapezoidal PDF to model the fault position within the scarp, assuming that the fault position is most likely between one‐half and one‐third of the scarp height, measured from the base of the scarp, with the likelihood decreasing to zero at the top and base of the scarp (Hughes et al., 2018; Luo et al., 2021). In the strike‐slip rate calculations, the input variables that we considered were relatively simple, involving only lateral offsets and ages of geomorphic surfaces which were all assigned normal distribution PDFs.…”

“…Our study area is located in the northern SGS, which is characterized by ENE‐striking normal faults and asymmetric half‐grabens with footwall blocks tilted to the SSE (and NNW), creating typical basin‐and‐range morphology (Luo et al., 2021; Xu & Ma, 1992; Xu et al., 2002). Geodetic surveys indicate that the northern SGS is dominated by horizontal crustal extension at rates of 1–2 mm/yr in the NNW‐SSE direction (Middleton et al., 2017; Zhao et al., 2017).…”

3D deep electrical structure and seismogenic environment in the western section of the Zhangjiakou-Bohai fault zone

“…Most of them are concealed, discontinuous, and arranged as an echelon. These EW-trending faults are represented by the southern margin fault of Huai'an Basin (F9), the southern margin fault of Xuanhua Basin (F10), and the northern margin fault of Huaizhuo Basin (F11) (Ran et al, 2001;Zhou, 2011;Qi, 2017;Luo et al, 2021).…”

“…FIGURE 2Geological setting [modified fromPeng et al (2017),Zhou (2011);Luo et al (2021)] and MT stations in studied region. Black Squares denote MT stations; Green square denote typical MT stations in Figure2; Abbreviations are: HAB, Huaian basin; YTB, Yanggao-Tianzhen basin; XHB, Xuanhua basin; HZB, Huaizhuo basin; F1, Daman-Qianheishatu fault; F2, Miaodongying-Dayingtan fault; F3, Dahezhen-Hailiutu fault; F4, Shangyi-Chicheng fault; F5, Zhangjiakou fault; F6, Ximalin-shuiquan fault; F7, Northern margin fault of the Huaian basin; F8, Northern margin fault of the Yanggao-Tianzhen basin; F9, Southern margin fault of the Huaian basin; F10, Southern margin fault of the Xuanhua basin; F11, Northern margin fault of the Huaizhuo basin; DQG, Daqinggou; GH, Gonghui; DHL, Dahulun; HLT, Hailiutu; DJH, Danjinghe; MJ, Manjing; DH, Dahe; SY, Shangyi; CL, Chongli; HTL, Hongtuliang; GJY, Gaojiaying; WQ, Wanquan; XML, Ximalin; ZJK, Zhangjiakou; HA, Huaian; ZW, Zuowei; TJY, Tianjiayao; LJW, LuJiawan; HAC, Huaiancheng; GC, Guocun; XHY, Xiahuayuan; TZ, Tianzhen; ZL, Zhuolu; HL, Huialai.…”