Article
Geosciences, Multidisciplinary
Xiangli He, Chong Xu, Wenwen Qi, Yuandong Huang, Jia Cheng, Xiwei Xu, Qi Yao, Yongkun Lu, Boyang Dai
Summary: On May 18, 2020, a magnitude 5.1 earthquake occurred in Qiaojia County, Yunnan Province, China, triggering numerous landslides. Through visual interpretation of high-resolution satellite images, the spatial distribution and tectonic significance of the landslides were analyzed. The results indicate that the landslides mainly align in the NW-SE direction parallel to a fault zone.
JOURNAL OF EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Yijian Zhou, Chunmei Ren, Abhijit Ghosh, Haoran Meng, Lihua Fang, Han Yue, Shiyong Zhou, Youjin Su
Summary: This study investigates the Yangbi earthquake sequence in southwest China in 2021 and its foreshock mechanism. Through the analysis of relocated aftershocks and focal mechanisms, the authors find that the mainshock and foreshocks occurred on different faults. By estimating the rupture area and calculating the evolution of Coulomb stress, they reveal the interactions between the foreshocks. The results suggest that the sequence can be explained by the cascade triggering mechanism, with evidence of aseismic slip contributing to the triggering process.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Xiangli He, Chong Xu
Summary: This study presents a detailed analysis of landslides induced by the Yangbi earthquake in Yunnan Province, China. The spatial distribution of the landslides is found to be correlated with topographic, seismic, and geological factors. The number and mobility of landslides increase with slope angle, while south- and southeast-facing slopes and weaker metamorphic rocks are more prone to landslides. The study also highlights the influence of both the mainshock and the foreshock on landslide development. The long axis of the landslide distribution area is parallel to a major fault zone, indicating a possible seismogenic structure.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Y. Cui, C. Zheng, L. Jiang, J. Huang, F. Sun, Z. Zou, J. Du
Summary: This study investigated the three-dimensional (3D) temporal variations and correlation analysis of CO, CH4 and O3 concentrations associated with two great earthquakes offshore Sumatra, Indonesia. The results showed that large amounts of gases were emitted from the Earth's crust before, during and after the earthquakes compared to the earthquake-free periods and background areas. Anomalies in gas concentrations occurred along the fault system and the correlation coefficients between the gas parameters increased closer to the earthquake occurrence. The findings are helpful in understanding geochemical earthquake anomalies and the mechanism of lithosphere-atmosphere-ionosphere coupling.
Article
Geochemistry & Geophysics
Edwin Nissen, Musavver Didem Cambaz, Elyse Gaudreau, Andrew Howell, Ezgi Karasozen, Elena Savidge
Summary: This study investigates the active tectonics in southwestern Turkey and reveals the dominant normal faulting orientation in the region. It also highlights the discrepancy between fault orientations in topography and actual faulting activity. The research provides valuable insights into the earthquake hazards in the area.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Haekal A. Haridhi, Bor Shouh Huang, Kuo Liang Wen, Arif Mirza, Syamsul Rizal, Syahrul Purnawan, Ilham Fajri, Frauke Klingelhoefer, Char Shine Liu, Chao Shing Lee, Crispen R. Wilson, Tso-Ren Wu, Ichsan Setiawan, Van Bang Phung
Summary: Near the northern border of Sumatra, the Sumatran fault zone splits into two branches and extends into the offshore. Large submarine landslides have been triggered by the extended fault zone, as indicated by seismic profiles. Based on simulation, the strike-slip fault system can generate a potential tsunami hazard along the northern coast of Aceh.
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2023)
Article
Environmental Sciences
Yuying Duan, Jing Luo, Xiangjun Pei, Zhuo Liu
Summary: The spatial distribution of co-seismic landslides in the 2014 Ludian earthquake showed complex patterns and did not align with the seismogenic fault. Factors such as distance to rivers and elevation were found to be influential, highlighting the importance of both geographical and seismic factors in landslide susceptibility.
Article
Geochemistry & Geophysics
Min Liu, Hongyi Li, Lu Li, Miao Zhang, Weitao Wang
Summary: This study investigates the foreshock sequence of the 2021 Yangbi M-S 6.4 earthquake using template matching and double-differencing methods. The analysis reveals that the foreshock sequence can be divided into four episodes, with the first episode initiating on a small fault and subsequent episodes shifting to a nearby major fault. The study also identifies aseismic slip in the early stage of mainshock nucleation and suggests that stress transfer may dominate the later stage. These findings suggest that both aseismic slip and stress transfer mechanisms are possible in the nucleation process of the mainshock.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Immunology
HengDuan Zhang, Jian Gao, Zu Ma, Yuan Liu, Ge Wang, Qing Liu, YuTong Du, Dan Xing, ChunXiao Li, Teng Zhao, YuTing Jiang, YanDe Dong, XiaoXia Guo, TongYan Zhao
Summary: This study reports the Wolbachia infection in wild Ae. aegypti in China. The infection rate was found to be 5%, with the prevalence of wAlbA and wAlbB strains in the natural population of Ae. aegypti in Yunnan Province.
FRONTIERS IN CELLULAR AND INFECTION MICROBIOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Kun Yan, Weijun Wang, Fei Peng, Qincai Wang, Huadong Kou, Aijing Yuan
Summary: By re-scanning continuous waveforms integrated with deep learning and template matching techniques, we constructed a more complete earthquake catalog in the 2021 Yangbi M6.4 focal area to explore the seismogenic structures and nucleation process. The new catalog has a higher number of earthquakes and a lower magnitude completeness compared to the CENC catalog. The distribution of earthquakes indicates a broom-shaped structure with oblique secondary faults and a strike-slip main fault. The southern part of the area has denser and higher magnitude aftershocks, possibly due to a weakened seismic gap caused by fluid at depth. Foreshocks were concentrated in the 8-kilometer-long fault zone south of the mainshock and showed a migration pattern towards the epicenter. In contrast, the northern part had fewer foreshocks and delayed triggered aftershocks that were shallow and small in magnitude. In summary, the northern part of the Yangbi fault is relatively locked, while the southern part has a weakening zone that promotes pre-slip.
SCIENCE CHINA-EARTH SCIENCES
(2022)
Article
Environmental Sciences
Qi Liu, Fengqin Chang, Ping Xie, Yang Zhang, Lizeng Duan, Haoyu Li, Xiaonan Zhang, Yun Zhang, Donglin Li, Hucai Zhang
Summary: Microbes play crucial roles in ecosystem services and biogeochemical processes in plateau lakes, but the composition, abundance, and diversity of microbiota in plateau lakes remain unclear. This study investigated the microbial communities in surface water of nine plateau lakes in Yunnan Plateau, southwestern China, during dry and rainy seasons using gene sequencing. The results revealed homogeneous bacterial community compositions and heterogeneous micro-eukaryotic community compositions in plateau lakes. The dominant bacterial phyla in oligotrophic lakes were Proteobacteria and Actinobacteriota, while mesotrophic lakes were dominated by Proteobacteria, Actinobacteriota, Bacteroidota, and Cyanobacteria. Eutrophic lakes were mainly dominated by Proteobacteria, Actinobacteriota, and Cyanobacteria. The major micro-eukaryotic phylum in these lakes was SAR_k_norank. The alpha-diversity of bacteria declined during the rainy season, while the diversity of micro-eukaryotes varied among lakes. Nutrient level-related factors drove microbiotic community assembly in the dry season, while in the rainy season, microbiota in oligotrophic lakes were influenced by nutrient levels. Precipitation drove microbial communities in mesotrophic and eutrophic lakes with large water volumes, while nutrient level-related factors regulated communities in lakes with small water volumes. This study provides important ecological knowledge about the microbiota of plateau lakes in Yunnan Plateau, with different characteristics.
Article
Geosciences, Multidisciplinary
Xuezhong Chen, Yane Li, Lijuan Chen
Summary: This study analyzes the relationship between b-value, Earth's rotation, and earthquake occurrence to explain the failure of the 1985 earthquake prediction. It suggests that a decline in b-value and significantly Earth's rotation-related seismic activity are precursors to earthquakes.
GEOMATICS NATURAL HAZARDS & RISK
(2022)
Article
Geochemistry & Geophysics
Marion Baques, Louis De Barros, Maxime Godano, Clara Duverger, Herve Jomard
Summary: The Ubaye Region in the French Western Alps is one of the most seismically active regions in France, experiencing mainshock-aftershock sequences, seismic swarms, and complex sequences. In this study, a regional catalogue of existing focal mechanisms is compiled, and 100 new calculated focal mechanisms of aftershocks following a mainshock in 2014 are added. The results suggest that fluid pressure is a common triggering mechanism for the seismic activity in the region.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Minhan Sheng, Risheng Chu, Zhigang Peng, Zigen Wei, Xiangfang Zeng, Qingdong Wang, Yong Wang
Summary: This study enhances our understanding of induced earthquakes by hydraulic fracturing by providing evidence from seismic data in the Weiyuan shale gas block in China. It confirms that the earthquakes in this area are induced by hydraulic fracturing and identifies pre-existing faults near the clusters. The study also suggests that fluid diffusion processes are the primary drivers of seismicity in this region.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Engineering, Geological
Ping Liu, Tongjie Ren
Summary: In this study, a region-specific Arias intensity attenuation relationship was developed using the China Strong-Motion Networks Center (CSMNC) database. It was recommended to be applied in the Sichuan-Yunnan region for moment magnitudes ranging between 4.2 and 7.0, distances ranging between 0 and 300 km, and with V-s30 ranging between 128 and 760 m/s. This relationship showed the best performance in fitting and predicting the data from the Sichuan-Yunnan region, although it had greater intra-event, inter-event, and total standard deviations compared to other regions.
BULLETIN OF EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Geological
Xiaying Li, Xinglin Lei, Qi Li
ROCK MECHANICS AND ROCK ENGINEERING
(2018)
Article
Energy & Fuels
Xiaying Li, Xinglin Lei, Qi Li, Xiaochun Li
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2017)
Article
Geochemistry & Geophysics
Lifen Zhang, Xinglin Lei, Wulin Liao, Jinggang Li, Yunsheng Yao
Article
Environmental Sciences
Yi Zhang, Ziqiu Xue, Hyuck Park, Ji-Quan Shi, Tamotsu Kiyama, Xinglin Lei, Yankun Sun, Yunfeng Liang
WATER RESOURCES RESEARCH
(2019)
Article
Chemistry, Multidisciplinary
Xinglin Lei, Shinian Li, Liqiang Liu
APPLIED SCIENCES-BASEL
(2018)
Article
Geochemistry & Geophysics
Ying-Hui Yang, Jyr-Ching Hu, Qiang Chen, Xinglin Lei, Jingjing Zhao, Weile Li, Rui Xu, Chun-Ying Chiu
Summary: The 6.0 magnitude earthquake in Sichuan's Changning county in June 2019 was possibly influenced by artificial pressure injections, geological conditions, and previous seismic events. The shallow depth and long slip distance indicate that the aftershocks with different motion patterns may be affected by high pore pressure.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Yi Zhang, Xinglin Lei, Tsutomu Hashimoto, Ziqiu Xue
Summary: This study demonstrates that high-resolution fiber optic distributed strain sensing (DSS) tools can successfully measure subtle elastic rock deformations during aquifer pumping tests, providing hydraulic parameter information. The results show that the simultaneous estimation of permeability and compressibility is possible using DSS data at low noise levels, but estimation difficulties arise when the data contain large noise.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
M. Kitamura, T. Hirose, X. Lei
Summary: This study determined the V-p-C-0 relationship in the Nankai accretionary prism down to around 3.2 km, revealing that sediments in this area tend to be weaker than estimated by other empirically determined V-p-C-0 relationships. Additionally, the study found that V-p generally increased with decreasing porosity in the accretionary prism sediments.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Shuai Wang, Guoyan Jiang, Xinglin Lei, Andrew J. Barbour, Xibin Tan, Caijun Xu, Xiwei Xu
Summary: Three destructive earthquakes occurred in the Changning shale gas field in the southwest Sichuan Basin, China from 2017 to 2019. These earthquakes were most likely induced by direct injection of pressurized fluids into fault zones. The earthquakes mainly ruptured sedimentary formations above the shale gas bed, with slip magnitudes ranging from 8.5 to 15 cm.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Min Liu, Lu Li, Miao Zhang, Xinglin Lei, Mladen R. Nedimovic, Alexandre P. Plourde, Rumeng Guo, Weitao Wang, Hongyi Li
Summary: Using a temporary dense seismic array, machine-learning-based detection, and accurate relocation, we identified a complex 3D fault zone accommodating a small earthquake swarm near Yunlong city, western Yunnan, China from February to May 2013. The swarm was primarily driven by pressurized fluid and likely initiated by stress fluctuations caused by a possible aseismic slip. The complexity of the initiation and evolution of the swarm was strongly controlled by 3D fault geometry.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Yingwen Zhao, Guoyan Jiang, Xinglin Lei, Caijun Xu, Bin Zhao, Xuejun Qiao
Summary: To understand the mechanism behind the Luxian earthquake that occurred on 15 September 2021 near an active hydraulic fracturing well pad, we utilized seismic waveforms, satellite imagery, and GPS data. Our findings indicate that the earthquake originated from a previously unmapped southwest-dipping reverse fault intersecting with a horizontal well on the well pad. The slip occurred below the shale gas bed but above the crystalline basement. Further analysis revealed that pore pressure increased near the hypocenter, likely due to fracking fluid injected through the wells, which ultimately triggered the Luxian earthquake.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Geological
Xiaying Li, Xinglin Lei, Haimeng Shen, Qi Li
Summary: The distribution of pore water significantly affects the mechanical property of rocks. In this study, the effect of heterogeneous distribution of pore water with high pressure on lower Shaximiao sandstone was investigated. It was found that flooding region with higher pore pressure benefits earlier fracturing, with fractures initiating in the saturated region and migrating towards partially saturated and dry regions. The formation of complex microcrack network and induced seismicity with higher b-value around the wet/dry boundary suggests the potential of developing an interactive wet/dry mixed fracturing technology to facilitate the formation of complex fracture networks and reduce the risk of induced earthquakes.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Jinrong Su, Xinglin Lei, Jun Li, Chunmei Huang
Summary: This study comprehensively analyzes the detailed seismogenic fault structure of the earthquake swarm that occurred in the Maerkang area on June 9, 2022. The results show that the swarm was not directly related to the nearby mapped fault, but rather resulted from the successive activation of a series of unknown faults. The findings provide insights into the tectonic stress environment of the Bayan Har plate and offer verifiable datasets for further research.
SEISMOLOGICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Guijuan Lai, Changsheng Jiang, Weilai Wang, Xinglin Lei, Long Zhang, Guangyao Cai, Haobo Gong, Xiangyun Guo, Mingfei Chen
Summary: On September 15, 2021, a Ms 6.0 earthquake occurred in Luxian County, southern Sichuan basin, China, causing significant damage and casualties. By analyzing data from temporary and permanent stations, researchers identified an increase in seismic activity since July 2021, with earthquakes showing specific directional patterns. The earthquake sequence, which occurred in an area with no previous notable seismic activity, was found to be associated with a blind thrust fault dipping to the southwest. These findings provide valuable insights for understanding local seismic risk and conducting future studies on the Luxian earthquake.
SEISMOLOGICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Zhiwei Wang, Xinglin Lei, Shengli Ma, Xiaolong Wang, Yongge Wan
GEOPHYSICAL RESEARCH LETTERS
(2020)