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学者姓名：江文
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Abstract ：
There are two seismic gaps (Dayi seismic gap and Tianquan-Kangding seismic gap) on the Longmen Shan fault (LMSF), despite the successive occurrence of the 2008 M(w)7.9 Wenchuan and 2013 M(w)6.6 Lushan earthquakes. To analyze the effects of the Wenchuan and Lushan earthquakes on the LMSF (especially on seismic gaps along the LMSF) and regional seismic hazards, we calculate Coulomb stress changes caused by the Wenchuan and Lushan earthquakes based on a three-dimensional viscoelastic finite element model. Additionally, we calculate the spatial distribution of regional b-values based on the instrumental seismic catalog before the Wenchuan earthquake. By utilizing the inverse correlation between b-value and stress level, we infer the regional background stress level. The results show that regional earthquakes (including the 2008 M(w)7.9 Wenchuan earthquake, 2013 M(w)6.6 Lushan earthquake, 2014 M(w)6.1 Kangding earthquake, 2017 M(w)6.5 Jiuzhaigou earthquake, and 2022 M(w)6.6 Luding earthquake) occurred in regions characterized by low b-values. Meanwhile, subsequent earthquakes occurred in regions where Coulomb stress changes caused by the Wenchuan and Lushan earthquakes were positive. This suggests that regions with both low b-values and positive Coulomb stress changes may pose higher seismic hazards. We found that there are four regions (southern Xianshuihe fault, Dongkunlun fault, northern Xiaojinhe fault, and Hanan-Qingshanwan fault) with both positive Coulomb stress changes caused by the Wenchuan and Lushan earthquakes and low b-values, which may indicate high stress accumulation and high seismic hazard in the future. The results also show that Coulomb stress changes caused by the Wenchuan and Lushan earthquakes increased significantly in the Dayi seismic gap (+ 0.216 similar to + 2.607 MPa) and Tianquan-Kangding seismic gap (+ 0.021 similar to + 0.211 MPa), while the result of the high b-values for the Dayi and Tianquan-Kangding seismic gaps indicate less background stress accumulation. However, with continued tectonic loading, seismic hazards on both seismic gaps should attract our attention.
Keyword ：
b-value b-value Coulomb stress changes Coulomb stress changes finite element model finite element model Longmen Shan fault Longmen Shan fault seismic gap seismic gap Wenchuan earthquake Wenchuan earthquake
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| GB/T 7714 | Sun, Yunqiang , Gong, Weicheng , Wei, Fuquan et al. Seismic Hazards Along the Longmen Shan Fault: Insights from Stress Transfer Between Major Earthquakes and Regional b-Values [J]. | PURE AND APPLIED GEOPHYSICS , 2023 , 180 (10) : 3457-3475 . |
| MLA | Sun, Yunqiang et al. "Seismic Hazards Along the Longmen Shan Fault: Insights from Stress Transfer Between Major Earthquakes and Regional b-Values" . | PURE AND APPLIED GEOPHYSICS 180 . 10 (2023) : 3457-3475 . |
| APA | Sun, Yunqiang , Gong, Weicheng , Wei, Fuquan , Jiang, Wen . Seismic Hazards Along the Longmen Shan Fault: Insights from Stress Transfer Between Major Earthquakes and Regional b-Values . | PURE AND APPLIED GEOPHYSICS , 2023 , 180 (10) , 3457-3475 . |
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Abstract ：
The Nanpanjiang Basin, one of the largest Triassic turbidite basins in the South China Block, has long been disputed with respect to its tectonic affinity. To better understand the tectonic processes of the basin, we conducted geological mapping, geochronological, and geochemical studies on the mafic intrusions (the Anding group) in Funing emplaced within the southern Nanpanjiang Basin. The Anding group mafic intrusions in Funing consist of gabbronorite and gabbroic diorite, and they are characterized by low TiO2 (0.54-1.18 wt%) and Ti/Y ratios (162-222), low (La/Yb)(CN) ratios (3.28-4.19), flat REE patterns, pronounced negative Nb, Ta and Ti anomalies. These mafic intrusions can be further divided into two subgroups: the Group 1 at 244 +/- 3 Ma and the Group 2 at 224 +/- 2 Ma. The Group 1 exhibits negative Eu anomalies, high Th/Hf ratios (1.61-1.91), high (Sr-87/Sr-86)(i) ratios (0.708710-0.711843), and low epsilon(Nd)(t) values (-6.70 to -7.82), while the Group 2 exhibits positive Eu anomalies, lower Th/Hf ratios (1.05-1.07), lower (Sr-87/Sr-86)(i) ratios (0.708397-0.708425) and higher epsilon(Nd) (t) values (-3.28 to -3.21). Both the Group 1 and Group 2 are derived from partial melting of spinel-bearing lithospheric mantle and formed at an intracontinental back-arc setting. These results, combined with regional considerations, support a new model that the Triassic Nanpanjiang Basin is an intracontinental back-arc extensional basin triggered by the westward subduction of the Palaeo-Pacific Plate, and the Triassic magmatism in Funing was a response to the extension.
Keyword ：
geochronology geochronology intracontinental back-arc extension intracontinental back-arc extension mafic intrusions mafic intrusions Nanpanjiang Basin Nanpanjiang Basin petrogenesis petrogenesis
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| GB/T 7714 | Jiang, Wen , Yan, Quanren , Xia, Wenjing et al. Geochronology and petrogenesis of Triassic low-Ti mafic intrusions in Funing: Implications for the tectonic evolution of Nanpanjiang Basin, SW China [J]. | GEOLOGICAL JOURNAL , 2021 , 56 (10) : 5235-5254 . |
| MLA | Jiang, Wen et al. "Geochronology and petrogenesis of Triassic low-Ti mafic intrusions in Funing: Implications for the tectonic evolution of Nanpanjiang Basin, SW China" . | GEOLOGICAL JOURNAL 56 . 10 (2021) : 5235-5254 . |
| APA | Jiang, Wen , Yan, Quanren , Xia, Wenjing , Deng, Li . Geochronology and petrogenesis of Triassic low-Ti mafic intrusions in Funing: Implications for the tectonic evolution of Nanpanjiang Basin, SW China . | GEOLOGICAL JOURNAL , 2021 , 56 (10) , 5235-5254 . |
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