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Yang J.,Wuhan University | Yang J.,Chongqing Three Gorges University | Zeng Z.,Wuhan University | Zeng Z.,Huazhong Tectonomechanical Research Center | And 6 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2015

On August 28st and 31st, 2013, two earthquakes with magnitude of 5.1 and 5.9 occurred on the boundary between Deqing County, Yunnan Province, and Derong County, Sichuan Province. In order to evaluate the damage of the earthquake, we investigated on lots of seismo-geological hazards induced by the earthquakes and conducted the field investigation of geological structural section about the fractures near the epicenter. Those two earthquakes successively occurring at the adjacent position led to the intensity of this earthquake higher than that of the same magnitude. The maximum intensity of the 5.9 earthquake is VIII degree and the perceptible area is relatively large. The macroseismic epicenter is about 5.1 km from the 5.1 microseismic epicenter is roughly located at the middle of the two microseismic epicenter (28.20°N, 99.36°E). The isoseismic line is shaped as an anomalous ellipse and the orientation of its long axis is NW-SE orientation along the Deqin-Zhongdian fault. According to the field investigation of geological structural section about the fractures near the epicenter, the focal mechanism solution data and the special distribution characteristics of the aftershocks, we preliminary infer that the seismogenic structure is Deqin-Zhongdian fault and the Deqing-Derong 5.9 earthquake is a normal fault type earthquake characterized by strike-slip. ©, 2015, China University of Geosciences. All right reserved. Source


Liu W.,Hubei University | Zeng Z.-X.,Hubei University | Zeng Z.-X.,Huazhong Tectonomechanical Research Center | Li S.-F.,Hubei University | And 3 more authors.
Geology in China | Year: 2014

The Yangyingzui W-Mo-Cu polymetallic deposit is located in the middle segment of the northeast Guangxi metallogenic belt. Orebodies occur within the porphyry and skarn of the contact zone, and mineralization is closely related to.the Yanyingzui porphyry. Up till now, however, there have been no precise data concerning the porphyry mineralization age of this ore deposit. The authors conducted the LA-ICP-MS zircon U-Pb chronologic study of the mineralized granite porphyry and granodiorite porphyry in the Yanyingzui W-Mo-Cu deposit and obtained ages of (426.2±2.3) Ma and (426.9±2.3) Ma, indicating that the porphyry is a product of tectonic-magmatic activity during the Caledonian. Combined with regional tectonic evolution, contrastive study of the timing for diagenesis and mineralization as well as geological characteristics of ores, it is suggested that the ore-forming and igneous activities of the Yangyingzui W-Mo-Cu polymetallic deposit occurred during Late Silurian, when the tectonic setting of the deposit was in the transition period from collision orogeny compression to extension. The Yangyingzui W-Mo-Cu polymetallic deposit has the same metallogenic age and same structural setting as the northeast Guangxi W-Mo mineralization belt, implying that the probable existence of an intense W-Mo-Cu mineralization during Caledonian period in northeast Guangxi. In addition, the NE-trending tectonomagmatic belt, the porphyry body zone and the periphery of the mineralization area are favorable areas in search for porphyry-skarn-type W-Mo-Cu polymetalic deposits, homologous series deposits and conceaned ore deposits, and hence more attention should be paid to the exploration and evaluation of the study area in the future. Source


Jin W.,Huazhong University of Science and Technology | Li Y.,Huazhong University of Science and Technology | Zhao W.,Guanzhou Institute of Road Engineering | Zheng W.,Huazhong University of Science and Technology | Zheng W.,Huazhong Tectonomechanical Research Center
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | Year: 2015

To check the efficiency of distributed optic fiber sensor in concrete component for stress, strain, and inner cracks, an experimental study was conducted by testing a standard 2 m beam. This study based on the physics of Brillouin scattered light, that is, the frequency of scatter has linear relation to the strain. In addition, the embedded optic fiber was adopted, and the beam was tested on the mechanical universal testing machine. The optical fiber analyzer was used for pumping the laser, inputting the detective pulse, and reading the scatter. The data's analysis was done by the analyzer to get the stress and strain and output a text file. During the testing process, traditional strain gauge was used for comparative study. Two types of optic sensor, naked optic fiber and glassfiber reinforced plastic (GFRP) intelligent reinforce bar, were checked. The result shows that the two types of optic sensor are effective for measuring the strain of concrete and detecting the cracks, and naked optic fiber is more sensitive than GFRR intelligent reinforce bar. © 2015, Huazhong University of Science and Technology. All right reserved. Source


He C.,Wuhan University | He C.,Huazhong Tectonomechanical Research Center | Li X.,Huazhong Tectonomechanical Research Center | Li X.,Wuhan University | And 4 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2015

At 08:04 of August 31st, 2013, an earthquake with a magnitude of Ms 5.9 occurred in Shangrila county of Tibetan Autonomous Prefecture, Yunnan Province (28.1°N, 99.4°E). The depth of the hypocenter is 10 km. The study area is seismically active in history and prone to earthquake in northwestern Yunnan. Then the focal mechanism solutions show that the Diqing Ms 5.9 earthquake is of normal faulting with dextral strike-slip and the attitude of the NW nodal plane is consistent to the Deqin-Zhongdian fault. In this paper, we discuss the bouguer anomaly near the epicenter using EIGEN-6C2 model, and the epicenter is located at the Moho depth undulating position, and place where the crustal thickness is unstable. From the profile of P wave velocity and crustal structure, we know that low-velocity layer exists at the bottom of the upper crust, and the layer is likely to be closely related to seismic energy accumulating and storing. The joint location of the edge of the low-velocity (high conductivity) layer and the Deqin-Zhongdian fractures is the location for the focus to release the accumulating energy. This provides a new case of the three-level tectonic model for intra-plate earthquake. ©, 2015, China University of Geosciences. All right reserved. Source


Zeng Z.,China Three Gorges University | Zeng Z.,Wuhan University | Zeng Z.,Huazhong Tectonomechanical Research Center | Liu G.,Huazhong Tectonomechanical Research Center | And 6 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2014

At 16:30 of August 3rd, 2014, an earthquake with a magnitude of Ms 6.5 occurred in Ludian County of Zhaotong City, Yunnan Province (27.1°N, 103.3°E). The depth of the hypocenter is 10 km. Due to this disaster, 617 people were died, 112 people disappeared and 108 840 000 people were injured. According to the superposition effects of the moon declination angle, sunspot extreme year cycles and the two, summed up 2013-2014 years is Yunnan strong earthquake periods of high risk, with the condition for the occurrence of Ms7 earthquake. The following year, forecast method based SW fingerprint information using the earthquake precursory instrument, developed by the end of 2014 211 earthquake prediction table, predict 2014 August Sichuan (26.18°N, 105.33°E) Ms5.3 earthquake will occur. The Ludian Ms 6.5 earthquake occurred on August 3, 2014 indicates that the error of the predicted date is only 1 day, the predicted epicenter is about 226 km away from the actual earthquake epicenter. Besides that the actual magnitude is Ms 1.2 larger than the predicted magnitude. According to the comprehensive analysis in tectonic setting, the S-wave crustal velocity structure and the focus mechanism of the Ludian earthquake, we believe that the Baogunao-Xiaohe left-lateral strike-slip fault triggered the Ludian earthquake, while the junction of the middle-low crust's low-velocity (high-conductivity) body and the Baogunao-Xiaohe fault is the location of the focus releasing the accumulated energy which practically is the epicenter. This provides a new case study of the three-level tectonic model for intraplate earthquakes. ©, 2014, China University of Geosciences. All right reserved. Source

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