Contemporary kinematics of the Ordos block, North China and its adjacent rift systems constrained by dense GPS observations

Zhao, Bin; Zhang, Caihong; Wang, Dongzhen; Yong, Huang; Tang, Kai; Du, Rong; Liu, Jingnan

doi:10.1016/j.jseaes.2016.12.045

Cited by 55 publications

(48 citation statements)

References 38 publications

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“…This gives an average vertical slip rate of the HPF of ~0.24 mm/year during the late Pleistocene, equivalent to a horizontal extension rate of ~0.14 mm/year. Our Holocene result is comparable to the GPS‐derived extension rate of 0.5–1.0 mm/year (Middleton et al, ; Wang et al, ; Zhang et al, ; Zhao et al, ), but the average late Pleistocene rate is smaller than GPS‐derived results. The slip rate is comparable to the other major active faults and grabens around the Ordos; see Middleton et al ().…”

Section: Discussionsupporting

confidence: 84%

Section: Slip Parameters Of the Ce 1303 Eventsupporting

confidence: 89%

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TheCE1303 Hongdong Earthquake and the Huoshan Piedmont Fault, Shanxi Graben: Implications for Magnitude Limits of Normal Fault Earthquakes

Deng

et al. 2018

JGR Solid Earth

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The CE 1303 Hongdong earthquake, with ~270,000 deaths, has been suggested as the first magnitude 8 earthquake recorded in North China. We use 31 AMS‐14C ages to date earthquakes recorded in the Huoshan Piedmont Fault, which is interpreted to be the causative fault for the event. We interpret fault traces and map the Hongdong earthquake surface rupture in detail. Four events are identified with timings constrained at 1,060–590 year BP (corresponding to the Common Era 1303 event), 3,310–3,210 year BP, 5,460–5,380 year BP, and 26,380 year BP, respectively. The later three events have a recurrence interval of ~2,000–3,000 years. We find that the Hongdong earthquake had a rupture length of ~98 km, a maximum throw of 5.0 m and a best estimate for magnitude in the range Mw 7.2–7.6. We suggest that previous magnitude estimates are overestimates. Normal fault earthquakes have smaller upper limits to their magnitudes than thrusts, because their relatively steep dips produce intersections at the base of the seismogenic layer at smaller downdip widths than gently dipping thrust faults. The Hongdong event was not an exception to this pattern. The historic released seismic moment may be closer to the accumulated moment than previously calculated.

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Section: Discussionsupporting

confidence: 84%

Section: Slip Parameters Of the Ce 1303 Eventsupporting

confidence: 89%

TheCE1303 Hongdong Earthquake and the Huoshan Piedmont Fault, Shanxi Graben: Implications for Magnitude Limits of Normal Fault Earthquakes

Deng

et al. 2018

JGR Solid Earth

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“…Furthermore, Li et al (2017) processed GPS data from a dense network of stations in the northeast Tibetan Plateau during 1999-2016 and found that the thrusting component of the Liupan Shan fault was approximately 2.9 ± 1.2 mm/a. Zhao et al (2017) suggested that shortening rate of the Liupan Shan fault was 3.0 ± 1.1 mm/a based on GPS data from 1998-2014. In this study, we assume that the shortening rate is identical to the movement velocity of the Liupan Shan, and the initial time of movement corresponds to the initial time of stage 3, which was 12 Ma (Li et al 2013).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

Gravity analysis of the offset between crustal structure and topography in the Liupan Shan, northeast Tibetan Plateau

Wang

2020

Earth Planets Space

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Dense gravity/GPS measurements collected around the southwest margin of the Ordos Block in 2014 and 2017 were used to obtain three gravity anomaly profiles across the Liupan Shan Mountains. The Liupan Shan is located in a Bouguer gravity anomaly (BGA) transitional zone; however, low BGAs to the west do not correspond to the topography of the Liupan Shan in that region, with a maximum offset of approximately 34 km. This offset is also found in inverted crustal density structures whereby the interface between the upper and lower crust is notably concave to the west of the Liupan Shan. Flexural analysis indicates that the effective elastic thickness is 5 km and the uplift is caused by oblique subduction of surface materials. According to this uplift mechanism, the offset suggests that Liupan Shan migrated eastward following partial isostatic compensation. Therefore, we suggest that Liupan Shan has experienced an uplift-compensation-uplift tectonic process.

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“…Here, we suggest that there are two possible reasons for the normal faulting tectonic stress field in this area. One is that the Haiyuan and -Nivet et al, 2004;Qu et al, 2017;Wang et al, 2011Wang et al, , 2013Zhao et al, 2017), with this regulatory zone exhibiting a NNW-SSE extensional environment (Figure 11a). As the Liupanshan region is on the leading edge of the E-SE movement of the Liupanshan Basin secondary block and is in contact with other F I G U R E 9 (a) Results of crustal stress field inversion from the 240 fault plane solutions for the study area with a grid interval of 0.5 × 0.5 .…”

Section: Characteristics Of the Liupanshan Basin Stress Fieldmentioning

confidence: 99%

Spatial variability of modern tectonic stress fields in the north‐eastern margin of Tibetan Plateau

Li¹,

Li³

et al. 2020

Geological Journal

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A modern tectonic stress field for the northeastern margin of Tibetan Plateau was determined using linear inversion. Focal mechanism solutions and the depths of 54 earthquakes from 2009 to 2017 were obtained from broadband seismic waveforms. We derived the tectonic stress field using the SATSI (Spatial and Temporal Stress Inversion) software based on the damped linear inversion method. The stress tensor structures are primarily indicative of strike-slip and thrust faulting; their distributions are controlled by the West Qinling and Haiyuan faults. The Longxi Block is surrounded by two faults dominated by thrust faulting; the regions in the periphery of the faults, (e.g., West Qingling Fault Zone and Liupanshan Basin) are primarily characterized by strike-slip faulting. However, normal faulting has developed in the Haiyuan-Zhongwei Belt of Liupanshan Basin, indicating that the latest tectonic regime is an NNW-SSE extension instead of a strike-slip fault with a thrust component, as has been previously suggested. This anomalous stress mechanism reflects the combined effects of block rotation and local extension resulting from movement along strike-slip faults. The West Qinling Fault is dominated by thrust faulting instead of strike-slip faulting. The Haiyuan-Liupanshan and Niushoushan-Luoshan faults are predominantly strike-slip faulting. The directions of the maximum stress axes (σ1) in both Liupanshan Basin and the Longxi Block are ENE-WSW down to Liupanshan in the south and West Qinling Fault Zone, where the stress axes gradually rotate clockwise to E-W. The modern tectonic stress field implies that regional stress originates from far-field effects of Indian and Eurasian plate collision. K E Y W O R D S focal mechanism solutions, Liupanshan Basin, northeastern margin of Tibetan Plateau, tectonic stress field, West Qinling Fault Zone 1 | INTRODUCTION The leading edge of growth and expansion of the Tibetan Plateau is along the northeastern margin, which is a modern geomorphologic and tectonic feature formed by ordered extension of the plateau during its gradual formation (

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Contemporary kinematics of the Ordos block, North China and its adjacent rift systems constrained by dense GPS observations

Cited by 55 publications

References 38 publications

TheCE1303 Hongdong Earthquake and the Huoshan Piedmont Fault, Shanxi Graben: Implications for Magnitude Limits of Normal Fault Earthquakes

TheCE1303 Hongdong Earthquake and the Huoshan Piedmont Fault, Shanxi Graben: Implications for Magnitude Limits of Normal Fault Earthquakes

Gravity analysis of the offset between crustal structure and topography in the Liupan Shan, northeast Tibetan Plateau

Spatial variability of modern tectonic stress fields in the north‐eastern margin of Tibetan Plateau

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