Surface creep and slip-behavior segmentation along the northwestern Xianshuihe fault zone of southwestern China determined from decades of fault-crossing short-baseline and short-level surveys

Zhang, Jing; Xu, Wen; Cao, Junxing; Yan, Wei; Yang, Yanping; Su, Qin

doi:10.1016/j.tecto.2017.11.002

Cited by 29 publications

(38 citation statements)

References 35 publications

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“…Fault crossing baselines from J. Zhang et al. (2018) are shown as triangles colored by the reported along‐strike slip rates (all but one below 1.5 mm/yr). Locations of major cities along the XSF are labeled with squares.…”

Section: Resultsmentioning

confidence: 99%

“…(a and b): Average LOS velocity maps for (a) ascending track 26 and (b) descending tracks 33 and 135 in the Xianshuihe Fault region.In both (a and b), red color represents radar range increase and blue color represents range decrease. Fault-crossing baseline survey sites from J Zhang et al (2018). are denoted with yellow triangles labeled with their station names.…”

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confidence: 99%

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Partial Coupling and Earthquake Potential Along the Xianshuihe Fault, China

Bürgmann

2021

JGR Solid Earth

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Creeping faults slip aseismically in their upper few kilometers and have been observed in various kinds of tectonic settings and environments around the world (Bürgmann, 2018;Harris, 2017). Continental strikeslip creeping faults represent an important portion of the slow slip family. In addition to field deployed creepmeters, alignment arrays and near-field GPS measurements, the dense spatial sampling of InSAR has proved to be particularly valuable for studies of creeping strike-slip faults, such as the San Andreas Fault (e.g.,

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Partial Coupling and Earthquake Potential Along the Xianshuihe Fault, China

Bürgmann

2021

JGR Solid Earth

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“…Evidence of creep on active faults in and around the Tibetan Plateau is uncommon. The other known case is the Xianshuihe fault in the section near 31°N, which creeps mostly in response to the 1973 M 7.6 Luhuo earthquake (Lv et al, 1997;Du et al, 2010;Zhang et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…2 and 3), or a long-lived acceleration driven by enhanced stress at the tip of the adjacent 1920 M ~8 rupture that terminated at the Jingtai pull-apart basin. It is common on partially creeping faults for the surface creep rate to be higher following a brittle faulting event and then decrease to the background creep rate in the decades afterward (e.g., Kaneko et al, 2013;Lienkaemper et al, 2014;Thomas et al, 2014;Zhang et al, 2018). The same earthquake rupture may also cause the depth of creep to increase temporarily from shallow down to the seismogenic depth (Jolivet et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Geomorphic offsets along the creeping Laohu Shan section of the Haiyuan fault, northern Tibetan Plateau

et al. 2018

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High-resolution topographic or imagery data effectively reveal geomorphic offsets along faults that can be used to deduce slipper event of recurrent rupture events. Documentation of patterns of geomorphic offsets is scarce on faults that undergo both creep and coseismic rupture. In this paper, we used newly acquired high-resolution light detection and ranging (LiDAR) data to compile geomorphic offsets along the Laohu Shan section of the Haiyuan fault, in the northern Tibetan Plateau, where interferometric synthetic aperture radar (InSAR) data suggest creep presently occurs over a 35-km-long stretch at a rate comparable to the long-term geological slip rate, despite evidence for past coseismic fault rupture. Numerous offset gullies identified using the LiDAR data yield a range of offsets from less than 2 m up to 50 m. These offsets have well-separated probability density peaks at 2-3 m, ~7 m, and ~14 m, with increments of 2-3 m, 4-6 m, and 5-7 m. The sequence of paleoseismic events along the Laohu Shan section indicates that the gullies with offsets of 2-3 m are likely related to surface rupture of the historical 1888 Jingtai earthquake, plus subsequent creep. Offset increments of 4-6 m and 5-7 m may represent coseismic slip in past paleoseismic events plus creep during the interseismic period. The creeping Laohu Shan section preserves numerous discrete cumulative offsets, with an offset clustering pattern indistinguishable from that on a locked fault with recurrent earthquake ruptures. Association of offset increments with known paleoseismic events yields a slip rate of 3-5 mm/yr during the past 200 years, roughly similar to the ~5 mm/yr creep rate. If the ratio of surface creep rate to the total fault slip rate has been continuous, then seismic moment release by brittle ruptures, and thus seismic hazard, would be much reduced on the Laohu Shan section of the Haiyuan fault. Alternatively, the current high creep rate may be a transient phenomenon, perhaps after slip following the 2000 Jingtai Mw 5.6 earthquake or in response to the adjacent 1920 M ~8 Haiyuan earthquake rupture that terminated immediately to the east.

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“…While slow slip was considered to follow such exponential decay since the last large M

_{normalw}

7 earthquake along the North Anatolian Fault creeping section in 1947, InSAR and recent creepmeter measurements highlight the transient‐like behavior of slow slip there (Bilham et al, ; Rousset et al, ). Close examination of creepmeter data recording the postseismic aseismic transient slip following the 1973, M

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7.6, and 1981, M

_{normalw}

6.9, earthquakes along the Xianshuihe fault along the eastern boundary of the Tibetan plateau suggests slip is also made of transient events (Zhang et al, ). Such burst‐like behavior was even evidenced much earlier on along the San Andreas fault system following the 1966 M

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6 Parkfield or 1987 M

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6+ Superstition Hills earthquakes (Bilham, ; Smith & Wyss, ).…”

Section: Spatial and Temporal Complexity Of Slow Slipmentioning

confidence: 99%

The Transient and Intermittent Nature of Slow Slip

Jolivet

Frank

2020

AGU Advances

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To first order, faults are locked while stress builds up to a devastating earthquake. However, we know that faults also slip slowly. After decades of geophysical observation, slow slip is now recognized as part of a continuum of transient deformation ranging from the dynamic propagation of seismic rupture to aseismic events over a wide range of durations and sizes. A growing body of evidence suggests that large‐scale slow slip events can be decomposed into a multitude of smaller, temporally clustered events. Slow slip is more frequent and more dynamic than is suggested by conceptual models of rate‐strengthening, stable slip.

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Surface creep and slip-behavior segmentation along the northwestern Xianshuihe fault zone of southwestern China determined from decades of fault-crossing short-baseline and short-level surveys

Cited by 29 publications

References 35 publications

Partial Coupling and Earthquake Potential Along the Xianshuihe Fault, China

Partial Coupling and Earthquake Potential Along the Xianshuihe Fault, China

Geomorphic offsets along the creeping Laohu Shan section of the Haiyuan fault, northern Tibetan Plateau

The Transient and Intermittent Nature of Slow Slip

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