Paleoseismic events and recurrence interval along the Beichuan–Yingxiu fault of Longmenshan fault zone, Yingxiu, Sichuan, China

Ran, Yongkang; Chen, Wen-Shan; Xu, Xiwei; Chen, Lichun; Hu, Wang; Yang, Chih‐Wen; Shu, Dong Wei

doi:10.1016/j.tecto.2012.07.013

Cited by 60 publications

(45 citation statements)

References 17 publications

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“…Additionally, defining the shear modulus to be 30GPa, the accumulated geodetic strain moment rate of the central and northern LMSF within a depth of 20 km is equivalent to ~6.2 × 10 17 Nm/a. Assuming such a constant interseismic accumulation rate, depending on the released seismic moment (e.g., [6,10]), the recurrence interval for the 2008 Mw 7.9 Wenchuan earthquake vary between 1200 to 3200 years, which is roughly consistent with the paleoseismic result of at most 3000 years [43]. (Figure 3b), such as the case of the Andean megathrust after the 2010 Maule M 8.8 earthquake [27].…”

Section: Fault Coupling Of the Longmenshan Fault Before And After Thesupporting

confidence: 65%

GPS-Derived Fault Coupling of the Longmenshan Fault Associated with the 2008 Mw Wenchuan 7.9 Earthquake and Its Tectonic Implications

Zhang

Shan

et al. 2018

Remote Sensing

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Abstract:Investigating relationships between temporally-and spatially-related continental earthquakes is important for a better understanding of the crustal deformation, the mechanism of earthquake nucleation and occurrence, and the triggering effect between earthquakes. Here we utilize Global Positioning System (GPS) velocities before and after the 2008 Mw 7.9 Wenchuan earthquake to invert the fault coupling of the Longmenshan Fault (LMSF) and investigate the impact of the 2008 Mw 7.9 Wenchuan earthquake on the 2013 Mw 6.6 Lushan earthquake. The results indicate that, before the 2008 Mw 7.9 Wenchuan earthquake, fault segments were strongly coupled and locked at a depth of~18 km along the central and northern LMSF. The seismic gap between the two earthquake rupture zones was only locked at a depth < 5 km. The southern LMSF was coupled at a depth of~10 km. However, regions around the hypocenter of the 2013 Mw 6.6 Lushan earthquake were not coupled, with an average coupling coefficient~0.3. After the 2008 Mw 7.9 Wenchuan earthquake, the central and northern LMSF, including part of the seismic gap, were decoupled, with an average coupling coefficient smaller than 0.2. The southern LMSF, however, was coupled to~20 km depth. Regions around the hypocenter of the 2013 Mw 6.6 Lushan earthquake were also coupled. Moreover, by interpreting changes of the GPS velocities before and after the 2008 Mw 7.9 Wenchuan earthquake, we find that the upper crust of the eastern Tibet (i.e., the Bayan Har block), which was driven by the postseismic relaxation of the 2008 Mw 7.9 Wenchuan earthquake, thrust at an accelerating pace to the Sichuan block and result in enhanced compression and shear stress on the LMSF.

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Section: Fault Coupling Of the Longmenshan Fault Before And After Thesupporting

confidence: 65%

GPS-Derived Fault Coupling of the Longmenshan Fault Associated with the 2008 Mw Wenchuan 7.9 Earthquake and Its Tectonic Implications

Zhang

Shan

et al. 2018

Remote Sensing

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“…Many of Earth's most recent seismic disasters have resulted from the rupture of faults that have recurrence times measured in thousands of years. The average recurrence interval of the Longmenshan Fault that produced the M w 7.9 Wenchuan earthquake in 2008 may well be 3-4 kyear (e.g., Ran et al 2013;Ren and Zhang 2013). The Greendale Fault, which produced the 2010 M w 7.1 Darfield earthquake, has a mean recurrence interval of 10-60 kyear (Hornblow et al 2014).…”

Section: The Potential For Larger Earthquakes Within the Crocker Faulmentioning

confidence: 99%

The 2015 M w 6.0 Mt. Kinabalu earthquake: an infrequent fault rupture within the Crocker fault system of East Malaysia

et al. 2017

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The M w 6.0 Mt. Kinabalu earthquake of 2015 was a complete (and deadly) surprise, because it occurred well away from the nearest plate boundary in a region of very low historical seismicity. Our seismological, space geodetic, geomorphological, and field investigations show that the earthquake resulted from rupture of a northwest-dipping normal fault that did not reach the surface. Its unilateral rupture was almost directly beneath 4000-m-high Mt. Kinabalu and triggered widespread slope failures on steep mountainous slopes, which included rockfalls that killed 18 hikers. Our seismological and morphotectonic analyses suggest that the rupture occurred on a normal fault that splays upwards off of the previously identified normal Marakau fault. Our mapping of tectonic landforms reveals that these faults are part of a 200-km-long system of normal faults that traverse the eastern side of the Crocker Range, parallel to Sabah's northwestern coastline. Although the tectonic reason for this active normal fault system remains unclear, the lengths of the longest fault segments suggest that they are capable of generating magnitude 7 earthquakes. Such large earthquakes must occur very rarely, though, given the hitherto undetectable geodetic rates of active tectonic deformation across the region.

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“…On the central fault and fore-range fault of the central section, there are many active landforms and well-preserved paleoearthquake traces have been found at many places with coseismic displacement >1 m for single events [16][17][18][19]. On the southern section, scattered active traces of Holocene and paleoearthquakes are observed only on the Dachuan-Shuangshi fault with atypical offsets, ~0.3-m displacement for one event.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, slight damage was seen on buried faults around Mianzhu [15]. Following the Wenchuan earthquake, trenches excavated along the surface rupture belt revealed paleoearthquakes similar to the 2008 event in coseismic offset on the three aforementioned faults [16][17][18][19]. Further south, the Longmenshan fault zone sprays into a series of sub-parallel fault clusters without visible trace on the surface.…”

Section: Tectonic Settingmentioning

confidence: 99%

The Lushan M S7.0 earthquake and activity of the southern segment of the Longmenshan fault zone

Chen

Ran

et al. 2013

Chin. Sci. Bull.

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Following the Lushan M S 7.0 earthquake on 20 April 2013, a topic of much concern is whether events of M S 7 or greater could occur again on the southern segment of the Longmenshan fault zone. In providing evidence to answer this question, this work analyzes the tectonic relationship between the Lushan event and the 2008 Wenchuan earthquake and the rupture history of the southern segment of the Longmenshan fault zone, through field investigations of active tectonics and paleoearthquake research, and our preliminary conclusions are as follows. The activity of the southern segment of the Longmenshan fault zone is much different to that of its central section, and the late Quaternary activity has propagated forward to the basin in the east. The seismogenic structure of the 2008 Wenchuan earthquake is the central-fore-range fault system, whereas that of the 2013 Lushan event is attributed to the fore-range-range-front fault system, rather than the central fault. The southern segment of the Longmenshan fault zone becomes wider towards the south with an increasing number of secondary faults, of which the individual faults exhibit much weaker surface activity. Therefore, this section is not as capable of generating a major earthquake as is the central segment. It is most likely that the 2013 earthquake fills the seismic gap around Lushan on the southern segment of the Longmenshan fault zone.

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Paleoseismic events and recurrence interval along the Beichuan–Yingxiu fault of Longmenshan fault zone, Yingxiu, Sichuan, China

Cited by 60 publications

References 17 publications

GPS-Derived Fault Coupling of the Longmenshan Fault Associated with the 2008 Mw Wenchuan 7.9 Earthquake and Its Tectonic Implications

GPS-Derived Fault Coupling of the Longmenshan Fault Associated with the 2008 Mw Wenchuan 7.9 Earthquake and Its Tectonic Implications

The 2015 M w 6.0 Mt. Kinabalu earthquake: an infrequent fault rupture within the Crocker fault system of East Malaysia

The Lushan M S7.0 earthquake and activity of the southern segment of the Longmenshan fault zone

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