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| 1 | Fault plane parameters of Sanhe-Pinggu M8 earthquake in 1679 determined using present-day small earthquakes显示文摘The great Sanhe-Pinggu M8 earthquake occurred in 1679 was the largest surface rupture event recorded in history in the northern part of North China plain. This study determines the fault geometry of this earthquake by inverting seismological data of present-day moderate-small earthquakes in the focal area. We relocated those earthquakes with the double-difference method.Based on the assumption that clustered small earthquakes often occur in the vicinity of fault plane of large earthquake, and referring to the morphology of the long axis of the isoseismal line obtained by the predecessors, we selected a strip-shaped zone from the relocated earthquake catalog in the period from 1980 to 2009 to invert fault plane parameters of this earthquake. The inversion results are as follows: the strike is 38.23°, the dip angle is 82.54°,the slip angle is-156.08°, the fault length is about 80 km,the lower-boundary depth is about 23 km and the buried depth of upper boundary is about 3 km. This shows that the seismogenic fault is a NNE-trending normal dip-slip fault,southeast wall downward and northwest wall uplift, with the right-lateral strike-slip component. Moreover, the surface rupture zone, intensity distribution of the earthquake and seismic-wave velocity profile in the focal area all verified our study result. | Xiaoshan Wang Xiangdong Feng Xiwei Xu Guiling Diao Yongge Wan Libin Wang Guangqing Ma | 2014 | Earthquake Science2014，27，6： | 9 |
| 2 | Fault plane parameters of Tancheng M81/2 earthquake on the basis of present-day seismological data显示文摘The great Tancheng earthquake of M81/2 occurred in 1668 was the largest seismic event ever recorded in history in eastern China.This study determines the fault geometry of this earthquake by inverting seismological data of present-day moderate-small earthquakes in the focal area.We relocated those earthquakes with the double-difference method and found focal mechanism solutions using gird test method.The inversion results are as follows:the strike is 21.6°,the dip angle is 89.5°,the slip angle is 170°,the fault length is about 160 km,the lower-boundary depth is about 32 km and the buried depth of upper boundary is about 4 km.This shows that the seismic fault is a NNE-trending upright right-lateral strike-slip fault and has cut through the crust.Moreover,the surface seismic fault,intensity distribution of the earthquake,earthquake-depth distribution and seismic-wave velocity profile in the focal area all verified our study result. | Cuiying Zhou Guiling Diao Jie Geng Yonghong Li Ping Xu Xinliang Hu Xiangdong Feng | 2010 | Earthquake Science2010，23，6： | 7 |
| 3 | Difference between focal mechanisms of Dayao earthquake doublet sequence显示文摘Using the maximum amplitude ratios of vertical component of P and S waves recorded by a regional network, 921 focal mechanisms of Dayao earthquake doublet sequence are determined by means of synthetic seismograms of a point source of dislocation in a plane layered medium.Among them,389 focal mechanisms are in the aftershock sequence of M6.2 earthquake occurred on 21 July,2003 and the other 532 focal mechanisms are in the aftershock sequence of M6.1 earthquake occurred on 16 October,2003 in Dayao,Yunnan.The focal mechanism consistent parameter a of the two aftershock sequences are calculated and analyzed.According to the focal mechanism consistent parameter a,the focal mechanisms of the first aftershock sequence are more consistent than those of the second.According to the comparison of CMT solutions of the two M6 earthquakes,the physical mechanism of the doublet in the intra-plate earthquake is very complex,and many processes are involved and interacted with each other.This doublet provides insights into earthquake clustering,triggering and stress cycling. | Xiaoshan Wang Xiangdong Feng Guiling Diao Libing Wang Lingling Cai | 2009 | Earthquake Science2009，22，6： | 1 |
| 4 | Consistent Distribution of Stress before Strong Earthquake from Focal Mechanisms显示文摘At some stage of a strong earthquake preparation,the focal mechanisms of small earthquakes have roughly the same direction with the tectonic stress field.According to this feature,we define the angle between P,B and T axis of focal mechanisms and the three stress axes of tectonic stress field as the consistency parameter a in studying the dynamic changes of stress fields in earthquake preparation areas.We mainly analyze the changes of the consistency parameter a of the MW8.3 Kuril island arc earthquake and the MW8.4 Peru earthquake.Our study shows that before the strong earthquakes,the earthquake area saw a low consistency,and the focal mechanisms of a series of small earthquakes had small differences in the directions with the tectonic stress field,which means the foreshocks were under the control of the stress field.On the other hand,a higher consistency means the focal mechanisms of their aftershocks are scattered and have big differences in the directions with the tectonic field,which indicate that the control of background stress field starts weakening. | Zeren Zhima Diao Guiling Li Zhixiong | 2010 | Earthquake Research in China2010，24，4： | 0 |
| 5 | Tectonic Features of the M_S8.0 Wenchuan Earthquake and Its Aftershocks显示文摘The M8.0 Wenchuan earthquake occurred on the Longmenshan fault zone. Based on field investigation of the surface rupture and focal mechanism study of the aftershocks, we discuss the geological relationship of the main, secondary and triggered ruptures. The main rupture is about 200km long and can be divided into the south part and the north part. The south part consists of two parallel fault zones characterized by reverse faulting, with several parallel secondary ruptures on the hanging wall of the main fault, and the north part is a single main fault zone characterized by lateral strike-slip and reverse faulting. Compared to a 300km long aftershock distribution, the surface rupture only occupies 200km, and the remaining 100km on the northeast of the main rupture was triggered by aftershocks. Study on the ruptures of this earthquake will be useful for studying the earthquake risk evolution on the Longmenshan fault system. | Tian Qinjian Diao Guiling Hao Ping Feng Xiangdong Sun Qing | 2009 | Earthquake Research in China2009，23，4： | 0 |
| 6 | Discussion on the Relationship between Different Earthquake Magnitude Scales and the Effect of Seismic Station Sites on Magnitude Estimation显示文摘Based on the earthquake catalog reported by the Chinese digital seismic network in recent years,we select the earthquakes with both surface wave magnitude and local magnitude and fit them into a relationship between the two magnitudes.The systematic difference is found from the formula which has been used for 30 years.Because of a large dynamic range and wide frequency range of the current digital observation system,in addition to a larger number of stations and earthquakes being used compared to before,the relation obtained in this paper seems more reliable.Our calculation shows that there is no significant difference before and after magnitude conversion so we suggest the abandonment of magnitude conversion.The site response of a station consists of amplification at different frequencies.The amplification is equal to about 1 and changes little with frequency at stations located on basement rock,and it is greater than 1 at low frequency ranges and less than 1 at high frequency ranges at stations located on sediment layers.The difference between magnitudes from single station located on sediment layer and the average magnitude from the whole network increases from negative to positive with period.It seems that there is no fixed station correction factor and the station correction method does not work to improve the accuracy and magnitude estimates. | Zhang Hongzhi Diao Guiling Zhao Mingchun Wang Qincai Zhang Xiao Huang Yuan | 2008 | Earthquake Research in China2008，22，1： | 0 |
| 7 | Clustering Analysis of Spatial Distribution of Seismicity in the Yellow Sea and Bohai Sea显示文摘According to tie records of seismic station networks of China’s continent and Korea Peninsula and the historical data,the complete seismicity pattern was obtained for the first time.The seismic zoning was conducted by means of the cluster analysis method.The map’s spatial distribution of seismicity from 1960 to 1994 shows that there are three strong seismic zones:the first one strikes in the NE direction,from the Jiangsu plain in China to the central Korean Peninsula; the second strikes in the NW direction,from the Bohai Sea,China to the southern Korean Peninsula; the third strikes in the NW direction,from the western Liaoning Province to Pyongyang.Most of earthquakes are located along these three zones,the seismic intensity is lower than that in the mainland,and exhibited the feature of fractured crust of a marginal sea basin. | Zhao Genmo,Diao Guiling,and Yang Gangsheng Seismological Bureau of Tianjin Municipality,Tianjin 300201,China | 1997 | Earthquake Research in China1997，11，4： | 0 |
| 8 | Characteristics of focal mechanisms in Chile subduction显示文摘We use the Centroid Moment Tensor(CMT) solution of the earthquakes occurred in Chile subduction to analyze the characteristics of focal mechanisms.We define the angle between P,B,and T axes of focal mechanisms and three stress axes of tectonic stress field as the consistency parameter,to research the dynamic changes of focal mechanism pattern in earthquake preparation area before the 2010 Maule,Chile earthquake.The result shows that the consistency parameter decreases before the earthquake,and the area of the lower consistent parameter visually coincides with the distribution of aftershocks.This phenomenon is similar to the Load-Unload Response Ratio(LURR) decreases prior to the occurrence of macro-fracture happened in the acoustic emission experiments involving large rock specimens under tri-axial stress. | Wang Xiaoshan Diao Guiling Feng Xiangdong Yang Yaqiong | 2012 | Geodesy and Geodynamics2012，3，3： | 0 |
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