The surface rupture zone and paleoseismic evidence on the seismogenic fault of the 1976 Ms 7.8 Tangshan earthquake, China

Guo, Hui; Jing-bo, Zhao

doi:10.1016/j.geomorph.2018.11.006

Cited by 16 publications

(14 citation statements)

References 13 publications

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“…Additionally, Fig. 3a earthquake sequence (Butler et al, 1979;Huang and Yeong, 1997;Wan et al, 2017) and the present active features of the main seismogenic faults in this area (Jiang, 2006;Guo et al, 2011;Guo and Zhao, 2019).…”

Section: Present Tectonic Stress Field In the Tangshan Seismic Regionmentioning

confidence: 94%

“…The topography is higher in the northern part of the basin than it is in the southern part of the basin (Guo and Zhao, 2019) (Fig. 1).…”

Section: Introductionmentioning

confidence: 97%

“…Previous studies indicate that most faults in the Tangshan seismic region, such as the Tangshan fault belt, the Luanxian-Laoting fault, the Changli-Ninghe fault, and the Jiyunhe fault, were created by late Pleistocene-Holocene tectonic activity (Li et al, 1998;You et al, 2002;Jiang, 2006;Guo and Zhao, 2019). While the seismic activity in the Tangshan region has decreased over the past 40 years , some ML 4.0-5.0 earthquakes have still occurred in the past 10 years (e.g., 5/28/2012 (ML 5.2), 9/14/2015 (ML 4.2), 9/10/2016 (ML 4.2), 3/24/2017 (ML 4.4), 8/2/2019 (ML 4.4)) (Yang et al, 2016;Lin et al, 2017;Feng et al, 2019;Fan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Geophysical prospecting (Hao et al, 1998;Li et al, 1998;Li et al, 2009;Yang et al, 2010;Liu et al, 2011;Ran et al, 2013;Zhang et al, 2013), geological mapping (Zheng et al, 1981;Gao et al, 2001;Guo et al, 2011;Guo and Zhao, 2019), and identification of geomorphic features (Qiu et al, 2005) have revealed the existence of various fault systems in this region (Fig. 1); the orientations of these fault systems are NEN (e.g., the Lulong fault -F6), ENE (e.g., the Tangshan fault belt -F4, the Ye'jituo fault -F3, the Changli-Ninghe fault -F5, the Cangdong fault -F14, and the Xi'nanzhuang fault -F11), NW (e.g., the Ji'yunhe fault -F2, the Luanxian-Laoting fault -F7, and the Bai'gezhuang fault -F8), WNW (e.g., the Lengkou fault -F17) and nearly EW (e.g., the Han'gu fault -F13 and the Haihe fault -F12).…”

Section: Introductionmentioning

confidence: 99%

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Fault slip potential induced by fluid injection in the Matouying EGS field, Tangshan seismic region, North China

Feng

Gao

Zhang

et al. 2022

Preprint

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Abstract. The Tangshan region is one of the most seismically active areas in the North China, and the 1976 M 7.8 earthquake occurred on July 28th near the Tangshan fault zone. The Matouying Enhanced Geothermal Systems (EGS) field is located ~90 km away from Tangshan City. Since the late 2020, preliminary hydraulic stimulation tests have been conducted at depths of ~3965–4000 m. Fluid injection into geothermal reservoir facilitates heat exchanger system. However, fluid injection may also induce earthquakes. In anticipation of the EGS operation at the Matouying uplift, it is essential to assess how the fault slip potential of the nearby active and quiescent faults will change in the presence of fluid injection. In this study, we first characterize the ambient stress field in the Tangshan region by performing stress tensor inversions using 98 focal mechanism data (ML ≥ 2.5). Then, we estimate the principal stress magnitudes near the Matouying EGS field by analyzing in situ stress measurements at shallow depths (~600–1000 m). According to these data, we perform a quantitative risk assessment using the Mohr-Coulomb framework in order to evaluate how the main active faults might respond to hypothetical injected-related pore pressure increases due to the upcoming EGS production. Our results mainly show that most earthquakes in the Tangshan seismic region have occurred on the faults that have relatively high fault slip potential in the present ambient stress field. At well distances of less than 15 km, the probabilistic fault slip potential on most of the boundary faults increase with continuing fluid injection over time, especially on these faults with well distances of ~6–10 km. The probabilistic fault slip potential increases linearly with the fluid injection rate. However, the FSP values decrease exponentially with increased unit permeability. The case study of the Matouying EGS field has important implications for the deep geothermal exploitation in China, especially for Gonghe EGS (in Qinghai province) and Xiong’an New Area (in Hebei province) geothermal reservoirs that are close to the Quaternary active faults. Ongoing injection operations in the regions should be conducted with these understandings in mind.

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Section: Present Tectonic Stress Field In the Tangshan Seismic Regionmentioning

confidence: 94%

“…The topography is higher in the northern part of the basin than it is in the southern part of the basin (Guo and Zhao, 2019) (Fig. 1).…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fault slip potential induced by fluid injection in the Matouying EGS field, Tangshan seismic region, North China

Feng

Gao

Zhang

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Northern China is marked by unusually active intraplate seismicity and Quaternary tectonic movement (Ye et al, 1985;Nábělek et al, 1987). Previous studies indicate that most faults in the Tangshan seismic region, such as the Tangshan fault belt, the Luanzhou-Laoting fault, the Changli-Ninghe fault, and the Jiyunhe fault, were created by Late Pleistocene-Holocene tectonic activity (Li et al, 1998;You et al, 2002;Jiang, 2006;Guo and Zhao, 2019). While the seismic activity in the Tangshan region has decreased over the past 40 years (Zhang et al, 2017), some M L 4.0-5.0 earthquakes still occurred in the past 10 yearse.g., on 28 May 2012 (M L 5.2), 14 September 2015 (M L 4.2), 10 September 2016 (M L 4.2), 24 March 2017 (M L 4.4), and 2 August 2019 (M L 4.4) (Yang et al, 2016;Lin et al, 2017;Feng et al, 2019;Fan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Fault slip potential induced by fluid injection in the Matouying enhanced geothermal system (EGS) field, Tangshan seismic region, North China

Feng

Gao

Zhang

et al. 2022

Nat. Hazards Earth Syst. Sci.

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Abstract. The Tangshan region is one of the most seismically active areas in the North China, and the 1976 M 7.8 earthquake occurred on 28 July near the Tangshan fault zone. The Matouying enhanced geothermal system (EGS) field is located ∼90 km away from the city of Tangshan. Since late 2020, preliminary hydraulic stimulation tests have been conducted at depths of ∼3965–4000 m. Fluid injection into geothermal reservoir facilitates a heat exchanger system. However, fluid injection may also induce earthquakes. In anticipation of the EGS operation at the Matouying uplift, it is essential to assess how the fault slip potential of the nearby active and quiescent faults will change in the presence of fluid injection. In this study, we first characterize the ambient stress field in the Tangshan region by performing stress tensor inversions using 98 focal-mechanism data (ML≥2.5). Then, we estimate the principal stress magnitudes near the Matouying EGS field by analyzing in situ stress measurements at shallow depths (∼600–1000 m). According to these data, we perform a quantitative risk assessment using the Mohr–Coulomb framework in order to evaluate how the main active faults might respond to hypothetical injected-related pore pressure increases due to the upcoming EGS production. Our results mainly show that most earthquakes in the Tangshan seismic region have occurred on the faults that have relatively high fault slip potential in the present ambient stress field. At well distances of less than 15 km, the probabilistic fault slip potential on most of the boundary faults increases with continuing fluid injection over time, especially on the faults with well distances of ∼6–10 km. The probabilistic fault slip potential (fsp) increases linearly with the fluid injection rate. However, the fsp values decrease exponentially with increased unit permeability. The case study of the Matouying EGS field has important implications for deep geothermal exploitation in China, especially for Gonghe EGS (in Qinghai Province) and Xiong'an New Area (in Hebei Province) geothermal reservoirs that are close to the Quaternary active faults. Ongoing injection operations in the regions should be conducted with these understandings in mind.

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Characteristics and main causes of earth fissures in northeastern Beijing Plain, China

Wan

Tan

Feng

et al. 2020

Bull Eng Geol Environ

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The surface rupture zone and paleoseismic evidence on the seismogenic fault of the 1976 Ms 7.8 Tangshan earthquake, China

Cited by 16 publications

References 13 publications

Fault slip potential induced by fluid injection in the Matouying EGS field, Tangshan seismic region, North China

Fault slip potential induced by fluid injection in the Matouying EGS field, Tangshan seismic region, North China

Fault slip potential induced by fluid injection in the Matouying enhanced geothermal system (EGS) field, Tangshan seismic region, North China

Characteristics and main causes of earth fissures in northeastern Beijing Plain, China

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