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| 1 | Spatio-temporal rupture process of the 2008 great Wenchuan earthquake显示文摘Focal mechanism and dynamic rupture process of the Wenchaun Ms8.0 earthquake in Sichuan province on 12 May 2008 were obtained by inverting long period seismic data from the Global Seismic Network (GSN), and characteristics of the co-seismic displacement field near the fault were quantitatively ana-lyzed based on the inverted results to investigate the mechanism causing disaster. A finite fault model with given focal mechanism and vertical components of the long period P-waves from 21 stations with evenly azimuthal coverage were adopted in the inversion. From the inverted results as well as after-shock distribution, the causative fault of the great Wenchuan earthquake was confirmed to be a fault of strike 225°/dip 39°/rake 120°, indicating that the earthquake was mainly a thrust event with right-lateral strike-slip component. The released scalar seismic moment was estimated to be about 9.4×1020―2.0×1021 Nm, yielding moment magnitude of Mw7.9―8.1. The great Wenchuan earthquake occurred on a fault more than 300 km long, and had a complicated rupture process of about 90 s duration time. The slip distribution was highly inhomogeneous with the average slip of about 2.4 m. Four slip-patches broke the ground surface. Two of them were underneath the regions of Wenchuan-Yingxiu and Beichuan, respectively, with the first being around the hypocenter (rupture initiation point), where the largest slip was about 7.3 m, and the second being underneath Beichuan and extending to Pingwu, where the largest slip was about 5.6 m. The other two slip-patches had smaller sizes, one having the maximum slip of 1.8 m and lying underneath the north of Kangding, and the other having the maximum slip of 0.7 m and lying underneath the northeast of Qingchuan. Average and maximum stress drops over the whole fault plane were estimated to be 18 MPa and 53 MPa, respectively. In addition, the co-seismic displacement field near the fault was analyzed. The results indicate that the features of the co-seismic displacement field were coincident with those of the intensity distribution in the meizo-seismal area, implying that the large-scale, large-amplitude and surface-broken thrust dislocation should be responsible for the serious disaster in the near fault area. | ZHANG Yong FENG WanPeng XU LiSheng ZHOU ChengHu CHEN YunTai | 2009 | Science China Earth Sciences2009，52，2： | 68 |
| 2 | Accurate relocation of earthquakes in central-western China using the double-difference earthquake location algorithm显示文摘The double-difference earthquake relocation algorithm (DD algorithm) has been applied to the accurate relocation of 10057 earthquakes in the central-western China (21°-36°N, 98°-112E°) during the period of 1992-1999. In total, 79706 readings for P waves and 72169 readings for S waves were used in the relocation, and the source parameters of 6496 events were obtained. The relocation results revealed a more complete picture of the hypocentral distribution in the central-western China. In several seismic belts the relocated epicenters present a more defined lineation feature, reflecting the close correlation between the seismicity and the active tectonic structures. The relocated focal depths confirmed that most earthquakes (91 percent of the 6496 relocated events) in the central-western China were located at shallower depths not deeper than 20 km. The distribution of focal depths indicates that the seismogenic layer in the central-western China is located in the upper-mid crust with its thickness no deeper than 20 km. | YANG Zhixian (杨智娴) CHEN Yuntai (陈运泰) ZHENG Yuejun (郑月军) Yü Xiangwei (于湘伟) | 2003 | Science China Earth Sciences2003，46，z2： | 32 |
| 3 | Temporal and spatial rupture process of the great Kunlun Mountain Pass earthquake of November 14,2001 from the GDSN long period waveform data显示文摘The temporal and spatial rupture process of the 14 November 2001 Kunlun Mountain Pass earthquake (KMPE) is obtained by inverting the high signal-to-noise-ratio P-waveform data of vertical components of 20 stations with epicentral distances less than 90°, which are of Global Digital Seismogragh Network (GDSN). The inverted results indicate that the KMPE consists of 3 sub-events. The rupture of the first sub-event initiated at the instrumental epicenter (35.97°N,90.59°E) and then propagated both westwards and eastwards, extending 140 km westwards at the speed of 4.0 km/s and 80 km eastwards at the speed of 2.2 km/s, which appeared to be an asymmetrical bilateral rupture dominantly from east to west. This sub-event formed a 220-km-long fault. Fifty-two seconds after initiation of the first sub-event, at which time the first sub-event was not over but in its healing phase, the rupture of the second sub-event initiated 220 km west of the epicenter and propagated both westwards and eastwards, extending 50 km westwards at the speed of 2.2 km/s and 70 km eastwards at the speed of 5.8 km/s, which appeared to be an asymmetrical bilateral rupture dominantly from west to east. The secondsub-event formed a 120-km-long fault. The second sub-event fused with the first sub-event 140km west to the epicenter right 12 s after its initiation. Fifty-six seconds after initiation of the first sub-event, at which time the first sub-event was getting close to the end of its healing phase, the rupture of the third sub-event initiated 220 km east of the epicenter and propagated both westwards and eastwards, extending 140 km westwards at the speed of 4.0 km/s and 130 km eastwards at the speed of 3.7 km/s, which appeared to be nearly an bilateral rupture. This sub-event formed a 270-km-long fault. The third sub-event fused with the first sub-event 80 km east of the epicenter right 36 s after its initiation. Afterwards, the source process of the KMPE was dominated by the slip after fusion of the first and third sub-events. | XU Lisheng CHEN Yuntai | 2005 | Science China Earth Sciences2005，48，1： | 12 |
| 4 | Source process of M_s6.4 earthquake in Ning’er, Yunnan in 2007显示文摘The moment tensor solution, source time function and spatial-temporal rupture process of the MS6.4 earthquake, which occurred in Ning’er, Yunnan Province, are obtained by inverting the broadband waveform data of 20 global stations. The inverted result shows that the scalar seismic moment is 5.51×1018 Nm, which corresponds to a moment magnitude of MW 6.4. The correspondent best double couple solution results in two nodal planes of strike 152°/dip 54°/rake 166°, and strike 250°/dip 79°/ rake 37°, respectively. Considering the isoseismals and geological structures in the meizoseismal region, the first nodal plane (strike 152°/ dip 54°/ rake 166°) is preferred to be the seismogenic fault. Thus, the MS6.4 earthquake occurred mainly along a right-lateral fault striking 152°. The source time function shows that the duration time of the earthquake is about 14 s. The most of the energy releases within the first 11 s and in 11-14 s the rupture is weak. The snapshots of the slip-rate indicate that the rupture process has 3 more detailed stages. In the first stage of the first 4 s after rupture initiation, the rupture propagates simultaneously toward both strike and dip directions; in the second stage of the following 3 s, the rupture extends to down-dip direction; and in the third stage, the rupture looks to be scattering on the fault. In general, this earthquake is of bilateral rupture, and the rupture mainly takes place in strike-dip direction. The major ruptured area is in the shape of a diamond with a dimension of 19 km. On the whole fault plane, the maximum slip is about 1.2 m, the average slip is about 0.1 m, the maxi-mum slip-rate is 0.4 m/s and the average slip-rate is 0.1 m/s. The features of the co-seismic theoretical displacement field of the Ning’er earthquake fault, calculated based on the inverted fault parameters, are consistent with those of the observed isoseismals. | ZHANG Yong XU LiSheng CHEN YunTai FENG WanPeng DU HaiLin | 2009 | Science China Earth Sciences2009，52，2： | 4 |
| 5 | Inversion of site effects and attenuation parameters of seismic wave using Lg wave data 显示文摘 | Zhu Xinyun Chen Yuntai | 2007 | Acta Seismologica Siniea2007，29，6： | 1 |
| 6 | Benzyl benzoates: New phlorizin analogs as nmshroom tyrosinase inhibitors 显示文摘 | FANG YUNTAI CHEN YAOZONG FENG GUANFENG | 2011 | Bioorganic and Medicinal Chemistry2011，19，3： | 1 |
| 7 | Decadal correlation between crustal deformation and variation in length of day of the earth 显示文摘 | Wang Qingliang Chen Yuntai Cui Duxin | 2000 | Earth Planets Space2000，52，： | 1 |
| 8 | Moment Magnitude and Its Calculation显示文摘In this paper,we give a brief introduction to the proposal and development history of the earthquake magnitude concept. Moment magnitude MWis the best physical quantity for measuring earthquakes. Compared with other magnitude scales used traditionally,moment magnitude is not saturated for all earthquakes,regardless of big and small earthquakes,deep and shallow earthquakes,far field and near field seismic data,geodetic and geological data,moment magnitude can be measured,and can be connected with wellknown magnitude scales such as surface wave magnitude MS. Moment magnitude is a uniform magnitude scale,which is suitable for statistics with wide magnitude range.Moment magnitude is the preferred magnitude selected by the International Seismological community,and it is preferred by the departments responsible for publishing seismic information to the public. Moment magnitude is a uniform magnitude scale,which is suitable for statistics with wide magnitude range. Moment magnitude is a preferred magnitude for international seismology,it is preferred by the agency responsible for providing information about earthquakes to the public. We provide all formulas used in the calculation of moment magnitude,and the calculation steps in detail. We also analyzed some problems and rules to solve these problems by using different formulas and numerical value calculation steps. | Chen Yuntai Liu Ruifeng | 2018 | Earthquake Research in China2018，32，4： | 1 |
| 9 | Rapid source inversions of the 2023 SE Türkiye earthquakes with teleseismic and strong-motion data显示文摘We conducted rapid inversions of rupture process for the 2023 earthquake doublet occurred in SE Türkiye,the first with a magnitude of M_(W)7.8 and the second with a magnitude of M_(W)7.6,using teleseismic and strong-motion data.The teleseismic rupture models of the both events were obtained approximately 88 and 55 minutes after their occurrences,respectively.The rupture models indicated that the first event was an asymmetric bilateral event with ruptures mainly propagating to the northeast,while the second one was a unilateral event with ruptures propagating to the west.This information could be useful in locating the meizoseismal areas.Compared with teleseismic models,the strong-motion models showed relatively higher resolution.A noticeable difference was found for the M_(W)7.6 earthquake,for which the strong-motion models shows a bilateral event,rather than a unilateral event,but the dominant rupture direction is still westward.Nevertheless,all strong-motion models are consistent with the teleseismic models in terms of magnitudes,durations,and dominant rupture directions.This suggests that both teleseismic and strong-motion data can be used for fast determination of major source characteristics.In contrast,the strong-motion data would be preferable in future emergency responses since they are recorded earlier and have a better resolution ability on the source ruptures. | Chenyu Xu Yong Zhang Sibo Hua Xu Zhang Lisheng Xu Yuntai Chen Tuncay Taymaz | 2023 | Earthquake Science2023，36，4： | 1 |
| 10 | Irreversible sorption of pentachlorphenol to sediments:experimental observations显示文摘 | Yingxu Chen Hualin Chen Yuntai Xu Mengwei Shen | 2004 | Environmental International2004，30，1： | 1 |
| 11 | A dislocation model of the Tangshan earthquake of 1976 from the inversion of geodetic data 显示文摘 | Chen Yuntai Huang Liren Lin Banghui | 1979 | Acta Geophysica Sinica1979，22，3： | 1 |
| 12 | The focal mechanism of the 1966 Xingtai earthquake as inferred from the ground deformation observations 显示文摘 | Chen Yuntai Lin Banghui Lin Zhongyang | 1975 | Acta Geophysica Sinica1975，28，3： | 1 |
| 13 | Towards a Virtual Asian-Pacific Seismological Network显示文摘Regional international cooperation in seismic data exchange and joint seismological analysis in the Asian-Pacific regions plays an important role in the reduction of earthquake disasters in these regions as well as the development of global seismology. Based on the up-to-date development of new technology and digital broadband seismology, we discussed the Asian Seismological Commission (ASC) Proposal “Asian-Pacific Seismological Data Center”. We applied the concept of virtual seismological network (Ottemoeller and Havskov, 1999) to the proposed ASC data exchange program. Based on the development of digital seismology, we introduced a concept of “modern earthquake catalogues” which include not only location parameters and magnitudes as in the conventional earthquake catalogues but also new parameters of earthquakes such as CMT, radiated energy, STF, and earthquake rupture process. We recommended a web-based regional international data exchange program between the ASC members with the purpose of forming a virtual Asian-Pacific seismological network, and the interpretation and analysis of broadband digital seismic waveforms conducted at distributed “data centers”. | Zhu Chuanzhen, Chen Yuntai, Liu Ruifeng, Xu Lisheng and Wu ZhongliangChina Seismological Bureau, Beijing 100036, China | 2002 | Earthquake Research in China2002，16，3： | 0 |
| 14 | Physics of Seismic Sources Ⅰ. Presentation of Seismic Sources显示文摘The description of a seismic source in terms of seismic moment tensors is one of the most important advances in the physics of seismic sources. In this article, the fundamental concepts associated with seismic moment tensors are introduced, with emphasis on application of the interpretation of broadband digital seismograms. The introduction includes the representation theorem, concepts of seismic moment tensors, geometry of seismic moment tensors, moment tensor inversion, source time function, empirical Green’s function, and the spatio-temporal slip function. The physical significance of the concept of a point source is also discussed from the perspective of broadband seismology. | Chen Yuntai and Wu ZhongliangInstitute of Geophysics, CSB, Beijing 100081, China | 1999 | Earthquake Research in China1999，13，2： | 0 |
| 15 | Physics of Seismic Source Ⅱ. Mechanics of Seismic Source显示文摘An earthquake is regarded as a fracture from the viewpoint of continuum mechanics, in which stress and strain play key roles in understanding the nature of a seismic source. This review briefly outlines the mechanics of a seismic source in terms of the dislocation model and crack model. The introduction includes the Coulomb failure criterion, static stress drop, dynamic stress drop, the Griffith criterion, and the scaling of source parameters. The selection of topics in the introduction emphasizes the application of seismic data, i.e., in practice, the mechanical parameters introduced here are measurable in the interpretation and analysis of seismic waveform data. | Chen Yuntai and Wu ZhongliangInstitute of Geophysics, CSB, Beijing 100081, China | 1999 | Earthquake Research in China1999，13，2： | 0 |
| 16 | Physics of Seismic Source Ⅲ. Statistical Mechanics of Earthquakes显示文摘The statistical mechanics of earthquakes adopts the concepts and methodology of statistical mechanics, especially the theory of critical phenomena, in studying the preparation, initiation, propagation and healing of earthquake rupture, which forms a new branch in the physics of seismic source in recent years. This article introduces to the fundamental concepts of the statistical mechanics of earthquakes. The introduction includes the seismic Hamiltonian, percolation model, earthquake rupture nucleation, and Burridge-Knopoff spring-block model. It is pointed out that some of the statistical mechanical models of earthquakes have a sound seismological basis. There is a smooth 'transition' from the 'classical' theory to the 'modern' theory of seismic source. | Chen Yuntai and Wu ZhongliangInstitute of Geophysics, CSB, Beijing 100081, China | 1999 | Earthquake Research in China1999，13，2： | 0 |
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