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| 1 | Three dimensional velocity structure and accurate earthquake location in Changning–Gongxian area of southeast Sichuan显示文摘In order to understand the crustal structure and tectonic background of the Changning–Gongxiang area, southeastern Sichuan Province, where a series of moderate-to-strong earthquakes occurred in recent years, we utilized the seismic phase data both from a local dense array and from the regional seismic networks;we used the tomoDD program to invert for the high-resolution three-dimensional velocity structure within the depth range of 0–10 km and for accurate hypocentral locations in this area. We analyzed the seismogenic structures for the events of Xingwen M5.7 in 2018 and Gongxian M5.3 and Changning M6.0 in 2019. The results show that:(1) widespread lateral inhomogeneity exists in the velocity structure of the study area, and the location of the velocity anomaly is largely consistent with known structures. In the range of distinguishable depth, the inhomogeneity decreases with increasing depth, and the velocity structure anomalies in some areas are continuous in depth;(2) earthquakes occurred in clusters, showing the characteristics of zonal folding trends in the NW-SE and NE-SW directions;the focal depth in the area is generally shallow in both the sedimentary cap and the crystalline basement. The seismogenic structures of small earthquake clusters are different in size and occurrence in different sections, and the clusters occurred mostly in regions with high P-or S-wave velocities;(3) synthesis of a variety of data suggests that the seismogenic structures of the Xingwen M5.7 and Changning M6.0 earthquakes are associated with slip faults that trend NW-SE in, respectively, the south wing and the axis of the Changning–Shuanghe anticline, while that of the Gongxian M5.3 earthquake is associated with thrust faults that trend N-S in the Jianwu syncline region. The dynamic sources of the three earthquakes are all from the SE pushing of the Qinghai–Tibet block on the Sichuan basin;(4) the risk of future strong earthquakes in this area must be reevaluated in light of the facts(a)that in recent years, moderate-to-strong earthquake swarms have occurred frequently in southeast Sichuan;(b) that the complex structural area exhibits the easy-to-trigger characteristic, and(c) that the small-scale faults in this area are characterized by the phenomenon of stress 'lock and release'. | Feng Long ZhiWei Zhang YuPing Qi MingJian Liang Xiang Ruan WeiWei Wu GuoMao Jiang LongQuan Zhou | 2020 | Earth and Planetary Physics2020，4，2： | 13 |
| 2 | Research Progress on the Problem of Fluid,Heat and Energy Distribution near the Earthquake Source Area显示文摘As the basic problems in seismology, fluid, heat and energy distribution near earthquake sources during earthquake generation have been the leading subjects of concern to seismologists. Currently, more and more research shows fluid around earthquake source areas, which plays an important role in the process of earthquake preparation and generation. However, there is considerable controversy over the source of fluid in the deep crust. As for the problem of heat around earthquake source areas, different models have been proposed to explain the stress heat flow paradox. Among them, the dynamic weakening model has been thought to be the key to solving the heat flow paradox issue. After large earthquakes, energy distribution is directly related to friction heat. It is of timely and important practical significance to immediately implement deep drilling in-site surveying to gain understanding of fluid, friction heat and energy distribution during earthquake generation. The latest international progress in fluid, heat and energy distribution research has been reviewed in this paper which will bring important inspiration for the understanding of earthquake preparation and occurrence. | Yan Rui Jiang Changsheng Shao Zhigang Zhou Longquan Li Yingchun | 2011 | Earthquake Research in China2011，25，4： | 1 |
| 3 | An im- proved harmony search based on teaching-learning strategy for unconstrained optimization problems 显示文摘 | TUO Shouheng YONG Longquan ZHOU Tao | 2013 | Mathematical Problems in Engineering2013，19，： | 1 |
| 4 | Research on the Accurate Location of the 2007 M_S6.4 Ning'er, Yunnan Earthquake显示文摘Five mobile digital seismic stations were set up by the Earthquake Administration of Yunnan Province near the epicenter of the main shock after the Ning'er M6.4 earthquake on June 3, 2007. In this paper, the aftershock sequence of the Ning'er M6.4 earthquake is relocated by using the double difference earthquake location method. The data is from the 5 mobile digital seismic stations and the permanent Simao seismic station. The results show that the length of the aftershock sequence is 40km and the width is 30km, concentrated obviously at the lateral displacement area between the Pu'er fault and the NNE-trending faults, with the majority occurring on the Pu'er fault around the main shock. The depths of aftershocks are from 2km to 12km, and the predominant distribution is in the depth of 8~10km. The mean depth is 7.9km. The seismic fault dips to the northwest revealed from the profile parallel to this aftershock sequence, which is identical to the dip of the secondary fault of the NE-trending Menglian-Mojiang fault in the earthquake area. There are more earthquakes concentrated in the northwest segment than in the southeast segment, which is perhaps related to the underground medium and faults. The depth profile of the earthquake sequence shows that the relocated earthquakes are mainly located near the Pu'er fault and the seismic faults dip to the southwest, consistent with the dip of the west branch of the Pu'er fault. In all, the fault strike revealed by earthquake relocations matches well with the strike in the focal mechanism solutions. The main shock is in the top of the aftershock sequence and the aftershocks are symmetrically distributed, showing that faulting was complete in both the NE and SW directions. | Lu Xian Zhou Longquan | 2012 | Earthquake Research in China2012，26，2： | 0 |
| 5 | A Review of Seismicity in 2016显示文摘1 SURVEY OF GLOBAL SEISMICITY A total of 17 strong earthquakes with MS≥7.0 occurred in 2016(by the end of December31,2016)throughout the world,according to the China Seismic Network.Among them,one earthquake with M_S8.0 occurred on November 13,2016 in New Zealand(Fig.1).The 2016New Zealand M_S8.0 earthquake(M_W7.8 measured by USGS)was the strongest | Li Zhichao Song Jin Jiang Xianghua Zang Yang Yang Wen Yao Qi Shi Haixia Han Yanyan Meng Lingyuan Zhou Longquan | 2017 | Earthquake Research in China2017，31，1： | 0 |
| 6 | The Static Stress Triggering Effects Related to the Yutian M_S7.3 Earthquake显示文摘This paper calculates the static Coulomb stress changes generated by four earthquakes in the Yutian area during 2008 ~ 2014 separately,then discusses the triggering influence,their accumulated Coulomb stress changes and their influence on nearby faults.The results indicate that the M S5.5 earthquake in 2011 and the M_S7.3 earthquake in 2014 are both in the regions where the Coulomb stress change is positive,the stress changes are 0.004 MPa and 0.021 MPa, respectively, meaning they are triggered by prior earthquakes.The M S6.2 earthquake in 2012 occurred in the place where Coulomb stress change was negative,so it is postponed by the prior earthquakes.The image of Coulomb stress changes of the M S7.3 earthquake in 2014 is in accord with aftershocks( M L≥ 3.0)distribution,but some regions on the fault where the Coulomb stress change is positive have few aftershocks,and strong aftershocks may occur at these districts in future.In addition,this paper calculates the Coulomb stress change on nearby faults,and finds that the Coulomb stress changes of different elements in the GGC fault are very different,and must receive strong triggered-influence,though the result may be influenced by the input finite fault model,so there is still a large earthquake-risk.The GGN,PLC,PLW and LBW faults were also triggered by the four earthquakes occurring between 2008 ~ 2014.Their maximum Coulomb stress changes all exceed 0.002 MPa,so they also have a strong earthquake hazard. | Song Jin Zhou Longquan | 2014 | Earthquake Research in China2014，28，4： | 0 |
| 7 | A Study on the Characteristics of the Yutian,Xinjiang M_S7.3 Earthquake,February 12,2014显示文摘The February 12,2014,MS7.3,earthquake in Yutian,Xinjiang,China,occurred as a result of shallow strike-slip faulting in the tectonically complex region of the northern Tibetan Plateau,with a depth of 17 km.This earthquake occurred several hundred kilometers north of the convergent India-Eurasia plate boundary.The epicenter location of the Yutian earthquake,36.1° N,82.5° E,is 110 km north of Yutian County,Hotan Prefecture.A large number of aftershocks from ML2.0 to ML3.0 occurred until 12:00oclock,February 23,2014 and the largest aftershock,MS5.7,occurred at 17:24 p.m.,February 12,2014.The b and h value of Yutian sequence are 0.70 and 1.29,respectively.The waiting time method reveals that the strong aftershocks above ML4.5comply with a linear relationship,which is consistent with the characteristics of a mainshock-aftershock sequence.Furthermore,we calculate the source parameters and analyze the rupture process based on the empirical relationships for the Yutian earthquake,and the results indicate a frictional undershoot behavior in the dynamic source process of the Yutian earthquake,which is also in agreement with the lower and similar b values compared with the 2008 MS7.3 Yutian earthquake and the 2012 MS6.2 Yutian earthquake. | Meng Lingyuan Zhou Longquan Shi Haixia | 2015 | Earthquake Research in China2015，29，1： | 0 |
| 8 | Research on the Distribution Features of the Benioff Strain Ratio in the North-South Seismic Belt after the Two Yutian M_S7.3 Earthquakes显示文摘In view of the correlation between tectonic activity and seismicity,the strong earthquake risk in the North-South Seismic Belt aroused wide concern after the 2014 Yutian M_S7.3 earthquake. Using the seismic catalog of the China Earthquake Networks Center,the Benioff strain ratio in the North-South Seismic Belt is calculated in 30 days before and after the March 21,2008 and February 12,2014 Yutian M_S7.3 earthquakes. Results show that in a year after the 2008 Yutian M_S7.3 earthquake,M > 5. 0 earthquakes all occurred near the high strain ratio area or the junction between the low and high strain ratio areas,the activity of strong earthquakes obviously coincides with the high strain ratio area,which indicates that these areas have a higher stress level. The Yutian earthquakes promoted the release of small earthquakes in the high stress areas. This research is of certain indicating significance to the study of subsequent strong earthquakes of this region. | Yang Wen Zhou Longquan Liu Jie Cheng Jia | 2014 | Earthquake Research in China2014，28，4： | 0 |
| 9 | Concentrated growth factor regulates the macrophage-mediated immune response显示文摘Concentrated growth factor(CGF)is a promising regenerative material that serves as a scaffold and adjunct growth factor for tissue engineering.The host immune response,particularly macrophage activity,plays a critical role in injury repair and tissue regeneration.However,the biological effect of CGF on the immune response is not clear.To enrich the theoretical groundwork for clinical application,the present study examined the immunoregulatory role of CGF in macrophage functional activities in vitro.The CGF scaffold appeared as a dense fibrin network with multiple embedded leukocytes and platelets,and it was biocompatible with macrophages.Concentrated bioactive factors in the CGF extract enhanced THP-1 monocyte recruitment and promoted the maturation of suspended monocytes into adherent macrophages.CGF extract also promoted THP-1 macrophage polarization toward the M2 phenotype with upregulated CD163 expression,as detected by cell morphology and surface marker expression.A cytokine antibody array showed that CGF extract exerted a regulatory effect on macrophage functional activities by reducing secretion of the inflammatory factor interleukin-1b while inducing expression of the chemokine regulated on activation,normal T cell expressed and secreted.Mechanistically,the AKT signaling pathway was activated,and an AKT inhibitor partially suppressed the immunomodulatory effect of CGF.Our findings reveal that CGF induces a favorable immune response mediated by macrophages,which represents a promising strategy for functional tissue regeneration. | Haiyun Luo Wenjing Liu Yachuan Zhou Xiao Jiang Yeungyeung Liu Qin Yang Longquan Shao | 2021 | Regenerative Biomaterials2021，8，6： | 0 |
| 10 | Characteristics of Seismic Activity in a 3-Dimensional Space before the Wen'an Earthquake,Hebei Province by Relocation of Small Earthquakes in the China's Capital Area显示文摘Characteristics of seismic activity before the M5.1 earthquake in Wen'an,Hebei Province on July 4,2006 are analyzed by relocation of small earthquakes in the China's capital area,and some results are obtained as follows:① The seismic activity of M L ≥3.0 in the middle part of the Hebei plain seismic belt displayed a feature of strengthening (lasting 43 months) quiescence (17 months) five years before the Wen'an earthquake.Simultaneously,the strain release curve showed a variation process of accelerating-flatting.② A seismogenic gap in a three-dimensional space,located at the depth of 15km ~ 20km,with 70km long in latitude direction and 90km long in longitude orientation,was formed by M≥2.0 earthquakes four years prior to the Wen'an earthquake.The initial rupture point of the Wen'an earthquake is situated at the bottom of the gap.③ The focal depths of earthquakes with M L ≥2.0 in the middle part of the Hebei plain seismic belt gradually increased from 10km to 30km during the period from April,2003 to October,2004.Meanwhile,the seismic activity obviously strengthened in the middle and lower crust (from 20km to 30km in depth). | Xue Yan Zhou Longquan Ma Hongsheng Liu Jie | 2010 | Earthquake Research in China2010，24，4： | 0 |
| 11 | Characteristics of Far-field Seismic Radiated Energy from the Five Earthquakes with MS≥5. 0 in the Earthquake Swarm Sequence of 2013,MS5. 8,Qianguo,Jilin Province,China显示文摘The Qianguo M_S5. 8 earthquake swarm of 2013 occurred in Qianguo,Jilin Province,China. There are five earthquakes with M_S≥5. 0 in the Qianguo earthquake swarm,with magnitudes of M_S5. 5,M_S5. 0,M_S5. 3,M_S5. 8 and M_S5. 0. In this study,the far-field seismic radiated energy characteristics of the earthquakes are compared based on the source spectrum and the ground motion spectrum of the earthquake swarm. The ground motion spectrum of the five earthquakes at Changchun seismic station( CN2),which is the national standard station,is first investigated with the recorded ground motions,and then the far-field seismic radiated energy is calculated and combined with the relationships of the source spectrum to describe the variable characteristics of the Qianguo earthquake swarm. Research results indicate that the second earthquake( No. 2) with M_S5. 0 is the key event of the earthquake swarm,which occurred on October 31,the same day following the first M_S5. 5 earthquake( No.1). In fact,the magnitude of event No. 2 decreased compared to event No.1,which did not agree with its large far-field seismic radiated energy. It needs to be pointed out that event No. 2 was the turning point event of the Qianguo earthquake swarm,as being a significant transition before the largest M_S5. 8 earthquake. | Meng Lingyuan Han Yanyan Zhou Longquan | 2016 | Earthquake Research in China2016，30，1： | 0 |
| 12 | Tomography for Q of the Eastern Section of the Tianshan Area from High-frequency Attenuation of S-wave显示文摘Based on the waveform data of 5,076 local earthquakes recorded at 25 stations in Xinjiang during the period from 2009 to 2014 and the observation reports provided by the Xinjiang Digital Seismic Network,a data set of 19,140 attenuation factors t*is obtained by fitting the high-frequency attenuation of S-wave spectra with a genetic algorithm. The spatial distribution of Q_S is determined by inverting the t*data with seismic tomography. The results show that the average Q0 in eastern Tianshan is 520,and there is a significant correlation between the Q_S value distribution or attenuation characteristics it disclosed and the surface structure of the study area. The Q_S value is lower in the intersection area of the mountain basin which is located on the north and south sides of the Tianshan Mountains,and the high Q_S distribution is more concentrated inside the Tianshan orogenic belt. The M≥6. 0 earthquakes have been basically located in the Low-Q_S region since 1900. 24 high heat flow points in eastern Tianshan are located at the north and south of Tianshan Mountains where low Q_S exists,indicating a negative correlation. In addition,there is a positive correlation between the velocity structure and the attenuation structure in the study area,which reflects the consistency of the 2-D attenuation structure with the velocity structure and the two-dimensional density structure. | Li Jin Zhou Longquan Wang Huilin Xiang Yuan | 2018 | Earthquake Research in China2018，32，1： | 0 |
| 13 | A Review of Seismicity in 2017显示文摘A total of 8 strong earthquakes with M S≥7.0 occurred in 2017(from January 1 to December 31,2017)throughout the world,according to the China Seismic Network,including one with M S≥8.0,i.e.,the great earthquake with M S8.2 which occurred on September 8,2017 in Chiapas,Mexico(Fig.1).The 2017 M S8.2 Chiapas,Mexico earthquake was located in the east of the Circum-Pacific Seismic Belt.The mainshock was normal type and the rupture was unilateral along the NW direction,with maximum intensityⅨ.Features of global seismicity of M S≥7.0 in 2017 are as follows. | Jiang Xianghua Wang Yue Han Yanyan Xue Yan Yang Wen Zang Yang Deng Shiguang Ma Yawei Yao Qi Song Jin Shi Haixia Zhang Xiaotao Meng Lingyuan Zhou Longquan | 2018 | Earthquake Research in China2018，32，1： | 0 |
| 14 | Study on the Anomaly of Small Earthquake Activity Before Moderate-strong Earthquake in the Northeast Margin of the Qinghai-Xizang (Tibet) Block显示文摘26 earthquakes with MS ≥5. 0 have been recorded in the northeast margin of the Qinghai- Xizang (Tibet) block since 1980,22 of which were relatively independent of other moderate- strong earthquakes. Research on the increase of small earthquake activity before the 22 moderate-strong earthquakes has indicated that small earthquake activity was enhanced before 17 of the moderate-strong earthquakes. Though the increased seismicity is a common phenomenon in the northeast margin of the Qinghai-Xizang ( Tibet ) block,we have difficulty in predicting the moderate-strong earthquakes by this phenomenon. In order to predict the moderate-strong earthquakes through the increased seismicity of small earthquakes,this paper attempts to propose a new method, which calculates small earthquake frequency through the change of distribution pattern of small earthquakes, based on the characteristics of small earthquake activity in the northeastern Qinghai-Xizang (Tibet) block,and then make primary applications. The result shows that we are able to obtain obvious anomalies in the frequency of small earthquakes before moderate strong earthquakes through the new method,with little spatial range effect on the amplitude of this small earthquake frequency anomaly. We can obtain mid to short-term anomaly indices for moderate-strong earthquakes in the northeast margin of the Qinghai-Xizang (Tibet) block. | Feng Jiangang Zhou Longquan Yang Liming Dai Wei | 2010 | Earthquake Research in China2010，24，1： | 0 |
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