Bounds on the Average Recurrence Interval of Major Earthquakes Along the Haiyuan Fault In North-Central China

Zhang, Peizhen; Molnár, Péter; Weigi, Zhang; Deng, Qi; Wang, Yipeng; Burchfiel, B. C.; Fangmin, Song; Royden, L.; Decheng, Jiao

doi:10.1785/gssrl.59.3.81

Cited by 34 publications

(7 citation statements)

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“…Thus, if the average displacement were 8 m and the recurrence interval were 800 to 1300 yr, the average slip rate would be 6 to 10 mm/yr. Moreover, we expect that any great earth-quake that occurred in the last 800 yr would have been recorded in the historic documents of China, because the Haiyuan area is only about 300 km from the ancient capital city of Xian (Zhang Peizhen et al, 1988). For the absence of such a recorded event, we suspect that the Holocene slip rate along the Haiyuan fault has not been much larger than about 10 mm/yr, but we cannot prove this definitely.…”

Section: Discussionmentioning

confidence: 89%

“…+ 325 yr B.P., or 5295 + 325 yr before 1920. Since this layer is clearly older than the 30 + 2 m offset (Zhang Peizhen et al, 1988), its age yields a minimum slip rate. For 22 + 2 m of pre-1920 slip, the resulting lower bound on slip rate is 4.1 + 0.5 mm/yr.…”

Section: Holocene Slip Rate Of the Haiyuan Faultmentioning

confidence: 97%

“…There are no terraces adja-within the channel in order to obtain the cent to the upstream and the downstream organic material to date the offset as well as reaches. Where the stream crosses the to study the earthquake recurrence interfault, it turns to trend N60"W, the general vals (Zhang Peizhen et al, 1988). Organic orientation of the Haiyuan fault.…”

Section: Holocene Slip Rate Of the Haiyuan Faultmentioning

confidence: 99%

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Bounds on the Holocene Slip Rate of the Haiyuan Fault, North-Central China

et al. 1988

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We measured the offsets of six stream valleys, of 30 to 90 m, along the northwest-southeast trending, left-lateral Haiyuan strike-slip fault, in north-central China. Minimum ages of these offsets were determined to estimate lower bounds for the Holocene slip rate. The most reliable bounds are 7.6 ± 1.0 and 6.7 ± 1.0 mm/yr, with three others that are smaller (3.4 ± 0.7, 3.5 ± 0.9, and 4.1 ± 0.4 mm/yr) and one large value (16.4 ± 5.9 mm/yr) that we doubt. Thus, the average Holocene slip rate of the Haiyuan fault is larger than 6 mm/yr and probably exceeds 7 mm/yr. If the average slip rate of 5 to 10 mm/yr for the Quaternary Period is applicable to the Holocene Epoch, the average rate is 8 ± 2 mm/yr.

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Section: Discussionmentioning

confidence: 89%

Section: Holocene Slip Rate Of the Haiyuan Faultmentioning

confidence: 97%

Section: Holocene Slip Rate Of the Haiyuan Faultmentioning

confidence: 99%

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Bounds on the Holocene Slip Rate of the Haiyuan Fault, North-Central China

et al. 1988

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“…However, there is no consensus on the slip rate along the HYF. Based on the ages of fault-related, scarp-derived colluvial wedges, Zhang et al (1988) obtained a slip rate of 8 ± 2 mm/year along the eastern section of the HYF. Based on offset geomorphic features and age constraints, Li et al (2009) inferred a slip rate of 4.5 ± 1.0 mm/year on the same section.…”

Section: Introductionmentioning

confidence: 99%

Systematic Search for Repeating Earthquakes Along the Haiyuan Fault System in Northeastern Tibet

2020

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Repeating earthquakes have been found at many faults around the world. The Haiyuan fault is a major left‐lateral strike‐slip fault along the northeastern boundary of the Tibetan Plateau. Two great earthquakes (1920 Haiyuan and 1927 Gulang) have occurred on and round this fault system, but the section between the ruptures of the two earthquakes, also known as the Tianzhu seismic gap, remains unbroken. Shallow creep has been observed from geodetic data at the Laohushan section of the Haiyuan fault near the eastern end of the seismic gap. However, the driving mechanism and depth extent of shallow creep are not clear. Here we conduct a systematic search for repeating earthquakes in northeastern Tibet based on seismic data recorded by permanent stations in 10 years (2009–2018). Based on waveform cross‐correlations, we find several repeating earthquake clusters at the Laohushan section. This is consistent with the shallow creep inferred from the geodetic data, indicating repeating earthquakes can be driven by nearby aseismic slip. Approximately 300 repeaters were found within clusters of intense seismicity near the rupture zones of the 1927 M8.0 Gulang and 2016 M6.4 Menyuan earthquakes. Relocation of events in the cluster near the Gulang earthquake delineates two possible unmapped faults orthogonal to the Haiyuan fault. In addition, we also identify several repeating earthquakes generated by mining activities with different waveforms and occurrence patterns. Our study suggests that repeating earthquakes around the Haiyuan fault are likely driven by long‐term postseismic relaxation process associated with the 1920 Haiyuan and 1927 Gulang earthquakes.

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“…The most often quoted of these are M 8.7 (Cavalié et al, 2008;Deng et al, 1986;Lasserre et al, 1999Lasserre et al, , 2002P. Zhang et al, 1987;W. Zhang et al, 1988), M 8 (Cavalié et al, 2008;Lasserre et al, 2007;, although the definition of the M used is unclear, and M S 8.5 (Ren et al, 2016(Ren et al, , 2018.…”

Section: Introductionmentioning

confidence: 99%

Magnitude of the 1920 Haiyuan Earthquake Reestimated Using Seismological and Geomorphological Methods

Kulikova

et al. 2020

JGR Solid Earth

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Reported magnitudes ranging between 7.8 and 8.7 highlight a confusion about the true size of the 1920 Haiyuan earthquake, the largest earthquake recorded in the northeast Tibetan Plateau. We compiled a global data set of previously unlooked‐at historical seismograms and performed modern computational analyses on the digitized seismic records. We found the epicenter to be near Haiyuan town and obtained a moment magnitude of MW=7.9±0.2. Following traditional approaches, we obtained mB=7.9±0.3 with data from 21 stations and MS(20)=8.1±0.2 with data from three stations. Geomorphologically, we mapped the surface rupture and horizontal offsets on high‐resolution Pleiades satellite and drone imagery that covered the entire western and middle sections of the 1920 Haiyuan earthquake rupture and compiled offsets reported on the eastern section from field measurements in the 1980s. Careful discrimination between single‐event and cumulative offsets suggests average horizontal slips of 3.0±1.0 m on the western section, 4.5±1.5 m on the middle section, and 3.5±0.5 m on the eastern section, indicating a total moment magnitude of MW=7.8±0.1. Thus, the seismological and geomorphological results agree within the uncertainties, a weighted average giving a moment magnitude of MW=7.9±0.2 for the 1920 Haiyuan earthquake. It is likely that earthquake magnitudes based on the historical M were systematically overestimated.

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Bounds on the Average Recurrence Interval of Major Earthquakes Along the Haiyuan Fault In North-Central China

Cited by 34 publications

References 0 publications

Bounds on the Holocene Slip Rate of the Haiyuan Fault, North-Central China

Bounds on the Holocene Slip Rate of the Haiyuan Fault, North-Central China

Systematic Search for Repeating Earthquakes Along the Haiyuan Fault System in Northeastern Tibet

Magnitude of the 1920 Haiyuan Earthquake Reestimated Using Seismological and Geomorphological Methods

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