Seismic hazard of multi-segment rupturing for the Anninghe–Zemuhe–Daliangshan fault region, southeastern Tibetan Plateau: constraints from geological and geodetic slip rates

Cheng, Jia; Xu, Xiwei; Yao, Qi; Yang, Xiaodong; Chen, Hua

doi:10.1007/s11069-021-04643-7

Cited by 12 publications

(6 citation statements)

References 60 publications

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“…We used predicted PGA to represent strong ground motion. The 475-year PGA results are from Jia Cheng et al (2021). Two sets of the results were supplied in their work: a compatible fault model from geological slip rates and geodetic slip rates inverted in an elastic block model.…”

Section: Datamentioning

confidence: 99%

“…Here, we converted the predicted PGA data to seismic intensity levels according to the statistical relationship between peak ground acceleration and seismic intensity according to the Chinese national standard China Seismic Intensity Scale (GB_T 17742-2020). The PGA data are those predicted as 10% in the next 50 years (Jia Cheng et al, 2021), based on the inverted geodetic and geological fault slip rates. In the intensity maps both from the geodetic and geological fault slip rates, the urban area of Xichang City is located in the Ⅷ+ intensity zone (Figure 6).…”

Section: Influence From Strong Ground Motionmentioning

confidence: 99%

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Earthquake scenario-specific framework for spatial accessibility analysis (SAA) of emergency shelters: a case study in Xichang City, Sichuan Province, China

Wang,

Cheng,

2024

Front. Earth Sci.

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The spatial accessibility of emergency shelters, indicating the difficulty of evacuation and rescue, is crucial for disaster mitigation and emergency management. To analyze accessibility, an effective approach is to evaluate the service capacity of emergency shelters. Multifaceted factors were employed to enhance the quantitative accuracy of accessibility indicators. However, scenario-specific analysis has not been emphasized. Considering the devastating potential of great earthquake disasters, we cannot ignore the impact of these scenarios on emergency shelter accessibility, especially in areas with high seismic risk. In this study, we developed an earthquake scenario-specific framework for spatial accessibility analysis (SAA), which integrates the service capacity of emergency shelters and the impact of strong ground motion and fault rupturing. We applied this framework to the urban area of Xichang City in Sichuan Province, western China. Xichang City, located in the linked area of the Anninghe fault and Zemuhe fault with many extreme historical earthquake disaster records, is prone to high seismic risk. We firstly collected emergency shelter and road network data in Xichang City. We then applied SAA based on the road network, using the network analysis method. After that, we analyzed the impact of strong ground motion on accessibility and generated the setback zone of fault rupturing. We integrated the effect of strong ground motion on accessibility within the setback zone of active faults. Finally, we generated a comprehensive accessibility map, considering both the predicted strong ground motion and potential fault rupturing. Our results show that the accessibility level changed in several towns of urban Xichang City due to strong ground motion and fault rupturing. The accessibility level decreased in Lizhou, Xingsheng, and Anning Towns. For areas with mapped fault lines, the accessibility level is Very-Low. Our results demonstrate the impact of earthquake damage on the accessibility of emergency shelters and the complexity of evacuation in earthquake scenarios. In general, we added earthquake rupturing and ground motion characteristics into the SAA framework. This framework will help us enhance the reliability of SAA and the feasibility of seismic vulnerability evaluation.

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Section: Datamentioning

confidence: 99%

Section: Influence From Strong Ground Motionmentioning

confidence: 99%

Earthquake scenario-specific framework for spatial accessibility analysis (SAA) of emergency shelters: a case study in Xichang City, Sichuan Province, China

Wang,

Cheng,

2024

Front. Earth Sci.

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“…Wang et al, 2020), seismogenic depth and seismic risk research based on seismic data and deformation data (J. , b value distribution studies based on seismic data (Yi et al, 2008), studies based on CO 2 and radon gas emissions (Y. Yang et al, 2018;, and earthquake hazard assessment based on rupture scenarios (Cheng et al, 2021;S. Yao & Yang, 2022).…”

Section: Luo Et Almentioning

confidence: 99%

“…The seismic hazard of the Anninghe fault has been studied in some previous studies. For example, Cheng et al (2021) calculated the peak ground acceleration (PGA) of the Anninghe-Zemuhe-Daliangshan area by considering multisegment ruptures and slip rates; the PGA obtained was on average higher than the China Seismic Ground Motion Parameters Zonation Map. For another example, S. Yao and Yang (2022) performed rupture simulations of the Anninghe fault by using the stress accumulation at the fault plane estimated by the interseismic locking model as the initial stress status, with the results indicating that the Anninghe fault has the potential for generating earthquakes with magnitudes of 6.9-7.3.…”

Section: Luo Et Almentioning

confidence: 99%

“…However, there have been no earthquakes of magnitude greater than or equal to 7 on the Anninghe fault since 1536, and since January 1977, the Anninghe fault has experienced a 30 yr period of quiescence without earthquakes with a magnitude greater than 4.0, forming a seismic gap, so an earthquake of a large magnitude is highly probable in the future (Wen et al., 2008). A number of other studies support this viewpoint, such as slip deficit studies based on global positioning system (GPS) data (Y. C. Li et al., 2021), interseismic coupling studies based on GPS data and interferometric synthetic aperture radar (InSAR) data (Jiang et al., 2015; Y. C. Li, Nocquet, Shan, & Jian, 2021), strain rate research based on GPS data (Q. Wang et al., 2020), seismogenic depth and seismic risk research based on seismic data and deformation data (J. Li et al., 2020), b value distribution studies based on seismic data (Yi et al., 2008), studies based on CO 2 and radon gas emissions (Y. Yang et al., 2018; Y. Yang et al., 2021), and earthquake hazard assessment based on rupture scenarios (Cheng et al., 2021; S. Yao & Yang, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Apparent Low‐Velocity Belt in the Shallow Anninghe Fault Zone in SW China and Its Implications for Seismotectonics and Earthquake Hazard Assessment

et al. 2023

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The Anninghe fault forms the eastern boundary of the Sichuan‐Yunnan block in Southwest China and has been identified as an earthquake gap zone. This study intends to construct the upper crustal shear wave velocity (Vs) structure beneath the Anninghe fault to understand its seismotectonics and potential large earthquake hazards. We deployed a dense seismic array along the southern central Anninghe fault valley. From the 3‐month continuous records, we calculated vertical‐component cross‐correlation functions (CCFs). However, the surface wave signals in the CCFs are intensely interfered by near zero‐time‐lag noise. We proposed a mode separation method based on the high‐resolution linear Radon transform, which suppressed the interfered noise and greatly enhanced the surface wave signals for ambient noise tomography of the Vs structure. The fine upper crustal structure reveals a distinct narrow low‐velocity belt within a depth of 3 km beneath the Anninghe fault zone. At deeper depths (4.5–8 km), the narrow low‐velocity belt shifts to the east and correlates with the distribution of local earthquakes. Combining previous results with our new findings, we presented a seismotectonic model of the southern central Anninghe fault, which interprets the narrow low‐velocity belt as a water‐contained fracture zone that forms a seismogenic zone at deeper depths under transpression. In addition, we demonstrated through scenario earthquake simulations that fine structures play a significant role in the assessment of earthquake hazards along the Anninghe fault. As such, this study provides a typical window into seismotectonics and large earthquake hazards in the active southeastern Tibetan Plateau.

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The activity, segmentation, and evolution characteristics of large-scale landslides along the Anninghe active fault zone, Southwest China

Zhou

et al. 2022

Bull Eng Geol Environ

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Seismic hazard of multi-segment rupturing for the Anninghe–Zemuhe–Daliangshan fault region, southeastern Tibetan Plateau: constraints from geological and geodetic slip rates

Cited by 12 publications

References 60 publications

Earthquake scenario-specific framework for spatial accessibility analysis (SAA) of emergency shelters: a case study in Xichang City, Sichuan Province, China

Earthquake scenario-specific framework for spatial accessibility analysis (SAA) of emergency shelters: a case study in Xichang City, Sichuan Province, China

Apparent Low‐Velocity Belt in the Shallow Anninghe Fault Zone in SW China and Its Implications for Seismotectonics and Earthquake Hazard Assessment

The activity, segmentation, and evolution characteristics of large-scale landslides along the Anninghe active fault zone, Southwest China

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