Huazhong Tectonomechanical Research Center

Wuhan, China

Huazhong Tectonomechanical Research Center

Wuhan, China

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Zeng Z.,China Three Gorges University | Zeng Z.,Wuhan University | Zeng Z.,Huazhong Tectonomechanical Research Center | Sibgatulin V.G.,Russian Academy of Sciences | And 8 more authors.
Earth Science Frontiers | Year: 2013

At 11: 55 of May 7, 2013, Victor G. Sibgatulin in the Special Engineering Design Bureau, Krasnoyarsk Scientific Center, Siberian Department of Russian Academy of Science, informed Zeng Zuoxun, the first author of the paper, that the natural electromagnetic pulse anomalies indicated that there would be an earthquake of magnitude about MS 6 in the west or east direction of the Wuhan City of China. At 22: 20 of May 7, 2013, Song Song in the Professional Secondary School of Pingyuan County, Dezhou, Shandong, China, informed Zeng Zuoxun about an earthquake prediction cooperated with Song Kefu, based on his observation of a precursory halo lasted for 10 minutes beginning from 11 o'clock of May 7, 2013. They predicted that an earthquake with magnitude ranging from MS 5.5 to 6.2 would occur in 7 days in the adjoining area of Tibet, Xinjiang and Qinghai of West China. On the basis of the comprehensive analysis of the prediction of Victor Sibgatulin and the prediction of Song Song and Song Kefu, and an observation for the locations of a degasification of the earth in the Naqu, Tibet by Zeng Zuoxun himself, the first author made a prediction for an earthquake around MS 6 in 10 days in the area of the degasification point(31.5°N, 89.0°E)and E-mailed the prediction to Song Song, Wang Jie and Pan Lili at 0: 54 of May 8, 2013. He offered another degasification point (31°N, 86°E) for the epicenter prediction at 8: 34 of the same day. At 18: 54: 30 of May 15, 2013, an earthquake of MS 5.2 occurred in the Nima County, Naqu, China. The epicenter is located at 31.6°N, 86.5°E. The focus is at the depth of 10 km. The occurring time of the Nima earthquake fell into the time window of the prediction made by Zeng Zuoxun and by Song Song and Song Kefu. The epicenter of the Nima earthquake fell into the area around the second degasification point. The Nima earthquake fell basically into the predicted magnitude by Victor Sibgatulin, by Song Song and Song Kefu and by Zuoxun Zeng. The significance of the successful imminent prediction of the Nima earthquake is that it is a successful case of the cooperation between two countries and among three institutions. It further proves that the successful prediction needs comprehensive analysis with multiple-method information. It is indicated by the section of the crust in the area around the epicenter and by the research of the active faults in the area that the NNW-trending Laiduo-Cuomai fault is the triggering fault of the Nima earthquake, that the concentration and storage of the earthquake energy was closely related to the high conductive-low velocity layer in the mid-crust and that the current stress field controlling the fault activities in the Tibet area is of characteristics of compression in SN direction and extension in EW direction.


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.


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.


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.


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.


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.


Wang J.,Wuhan University | Wang J.,China Three Gorges University | Wang J.,Huazhong Tectonomechanical Research Center | Zhang X.,Wuhan University | And 8 more authors.
Earth Science Frontiers | Year: 2013

The effects of methane and other fluid on earthquake have widely attracted attention of the world after the Wenchuan earthquake(MS 8.0). Since most of the data used in observation and research were derived from surface or subsurface stations which are distributed scatteringly and are costly to be maintained, it is difficult to develop real-time monitoring in a large area. We studied the relationship between the variation of methane concentration and the abnormal temperature increasing of the atmosphere before the Lushan earthquake (MS 7.0) in the Longmenshan area, by using the methane concentration data extracted from Atmospheric Infrared Sounder (AIRS) on NASA's Aqua satellite. The results show that we could find the emission of subsurface methane before earthquake from Atmospheric Infrared Sounder, which provides a new way to monitor the seismic precursor. Moreover, this research shows that the methane emission was closely related to the abnormal temperature increasing of the atmosphere before the earthquake. The methane emission anomalies were controlled by active fractures significantly. They mainly concentrated along the Longmenshan fracture zone, Xianshuihe fault, and Rongjing-Mabian fault. Finally, we discussed the mechanism of emission of methane and other fluid. It is considered that the emission of these fluids was attributed to the fracturing and fracture propagation in the upper crust in the pre-earthquake stage.


Liu G.,China Three Gorges University | Zeng Z.,China Three Gorges University | Zeng Z.,Wuhan University | Zeng Z.,Huazhong Tectonomechanical Research Center | And 5 more authors.
Earth Science Frontiers | Year: 2013

At 7: 45 of July 22, 2013, an earthquake occurred at the border between Minxian and Zhangxian of Dingxi City (34.5°N, 104.2°E), Gansu Province with magnitude of MS 6.6. The depth of the focus is 20 km. In this disaster, 95 people died, 1366 people were injured, and the total economic loss reaches 21 billion Yuan RMB. We review the imminent prediction process and basis for the earthquake using the fingerprint method created by the first author. We also discuss the triggering structure and the seismic mechanism of the earthquake. Nine channels or 15 channels of anomalous components-time curves can be output from the SW monitor for earthquake precursors (or simply SW monitor for short). These components include geomagnetic, geoelectric, crust stresses, resonance, and crust inclination components. When we compress the time axis, the output curves become different geometric images. The precursor images are different for earthquake in different regions. The alike or similar images correspond to earthquakes in a certain region. In this way, we can predict the location for a coming earthquake using the precursor images. This can be analogous to a person's definite fingerprint. We can find a person with a fingerprint. Therefore, the method predicting earthquake by using the precursor images is called fingerprint method. According to the 7-year observation of the precursor images and their corresponding earthquakes, we usually get the fingerprint 6 days before the corresponding earthquake. The magnitude prediction needs the comparison between the amplitudes of the fingerprints from the same channel. In this way, the fingerprint works a miracle that we can predict the three key elements of earthquake using single station data. At 10: 45 of July 15, 2013, the first author predicted that there would be an earthquake occurring on July 19, 2013, in Gansu (35.19°N, 103.69°E)with the magnitude of MS 5.1 on the basis of the comparison between the fingerprints from the channel 5 on July 14, and on June 2, 2013. The Minxian MS 6.6 earthquake occurred on July 22, 2013 indicates that the predicted epicenter is accurate, that the earthquake occurring time is delayed only 3 days, and that the magnitude is larger than the predicted magnitude by MS 1.5. In general, it is a successful imminent prediction. From the comprehensive analysis of the tectonic setting, the crust P wave velocity structures and the focus mechanism of the Minxian earthquake, we consider that the Lintan-Lixian left-lateral thrusting is its triggering and that the joint location of the edge of the low-velocity (high-conductivity) layer and the Lintan-Lixian fractures is the location for the focus to release the accumulated energy. This provides a new case of the three-level tectonic model for intraplate earthquake.


Pan L.,China Three Gorges University | Pan L.,Wuhan University | Pan L.,Huazhong Tectonomechanical Research Center | Zeng Z.,China Three Gorges University | And 5 more authors.
Earth Science Frontiers | Year: 2013

The infrasound monitors installed in the Three Gorges Reservoir Area by the Three Gorges Research Center for Geo-hazard of China University of Geosciences (Wuhan) had received abnormal signals before the onset of the Lushan earthquake (MS 7.0, April 20, 2013) and Yushu earthquake (MS 5.2, June 26, 2011). We analyzed the abnormal signals received by different stations using both Matlab filtration and wavelet analysis. The frequency of the precursory infrasonic signals predating the Lushan earthquake is mainly (0-4)×10-3Hz, and that of the Yushu earthquake is mainly (0-5)×10-3Hz. The amplitude of the precursory infrasonic signal increases with the earthquake magnitude. After we analyzed the time difference of the abnormal signals received by Yesanguan and Zigui stations and the distance between the epicenter and the stations, we calculated that the velocity of the precursory ultra-low frequency infrasonic wave of the Yushu earthquake is 6.4 m/s. To investigate the possibility of short-term and impending earthquake predictions, we developed a monitoring array, a big triangle array enclosing a small triangle array, to detect the location of the epicenter for the further researches.


Zeng Z.,China Three Gorges University | Zeng Z.,Wuhan University | Zeng Z.,Huazhong Tectonomechanical Research Center | Wang J.,China Three Gorges University | And 2 more authors.
Earth Science Frontiers | Year: 2013

Lushan Earthquake (MS 7.0, April 20, 2013) is another disastrous geological event along the Longmenshan earthquake fracture zone after 2008. This article reviews a successful medium-term prediction for the large Earthquake. It also gives the reason for the prediction of the epicenter. In the morning of November 25, 2012, the Committee for Predicting Natural Disasters of Chinese Geophysical Society discussed the Medium-Term earthquake prediction for the southwest China. Qingguo Geng, the director of the committee reviewed his prediction presented in April, 2012, that there would be a possible earthquake of MS 7.0 to MS 8.0 in the southwest China during the period of May, 2012 through May, 2013. Members attended the meeting agreed with the prediction time, but had different opinion in the location of the possible large earthquake in the southwest China. The first author made a presentation at the meeting. Zuoxun Zeng gave a definite location on his prediction map. It is located at the middle of the line linking Ya'an and Kangding, Sichuan Province. This prediction is made mainly according to two aspects. One is that two satellite local intense gravity anomalies with the same characteristics are appearing at the Wenchuan area and the west to Ya'an City, respectively. The other is that the Wenchuan earthquake only released the energy of the northeast part of the longmenshan fracture zone, this leads to the stress and energy concentration at the southwestern part of the fracture zone, especially at the southwestern end of the Longmenshan fracture zone with the abrupt gravity change, or abrupt change of density of the middle crust. The epicenter of Ya'an Earthquake (MS 7.0) is located at Lushan of Ya'an City, 80 km from the predicated location. The origin time of the quake is before May of 2013. The successful medium-term prediction of the Lushan earthquake has given us a good deal of enlightenment: as a geological process, earthquake should have its own regularity. A successful earthquake prediction needs comprehensive analysis by using information from different observations. Just because of this, the main need now is a national or international expert group with comprehensive analysis experience and an efficient information platform for seismic precursor. The data processing and update for the satellite gravity will be helpful to narrowing the area of the possible large earthquakes.

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