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| 1 | Relocation of the Foreshocks and Aftershocks of the 2021 Ms 6.4 Yangbi Earthquake Sequence,Yunnan,China显示文摘An Ms 6.4 earthquake occurred in Yangbi,Yunnan,China on May 21,2021,which has obvious foreshock activity and abundant aftershocks.Based on the seismic observation data recorded by the Yunnan Seismic Network three days before and seven days after the mainshock,a doubledifference location method was used to relocate 2133 earthquakes of the Yangbi sequence.Aftershocks are mostly distributed to the southeast of the mainshock in a unilateral rupture pattern.This sequence exhibits a SE-trending linear alignment with a length of about 25 km,and most of the focal depth is above 12 km.Integrated with the seismic distribution and focal mechanism results,we infer that the strike of the seismogenic fault is about 140°,and dipping to the SW.The fault structure revealed by the seismic sequence is complex,with the NW segment exhibiting a steep dip and relatively simple structure of strike-slip rupture and the SE segment consisting of several branching ruptures.The Yangbi Earthquake is a typical foreshock-mainshock-aftershock sequence,and the mainshock is likely triggered by the largest foreshock.This earthquake occurred in the boundary between high-and lowvelocity anomalous zone,where is susceptible to generate large earthquakes. | Ting Yang Boren Li Lihua Fang Youjin Su Yusheng Zhong Jingqiong Yang Min Qin Yaji Xu | 2022 | Journal of Earth Science2022，33，4： | 5 |
| 2 | Introduction to China’s Earthquake Emergency Response System显示文摘Following the M_(S)6.4 earthquake that occurred on May 21,2021 in Yangbi,Yunnan,China,the earthquake emergency response system(EERS)responded immediately.The real-time software delivered many seismic parameters that provided a preliminary assessment of the earthquake.The 24-hour on-duty staff and scientific researchers revised these parameters and produced more detailed reports to understand the cause of the earthquake and the potential damage,which provided valuable information for emergency rescue operations and earthquake situation assessment.Emergency personnel were dispatched immedia-tely to the earthquake site to observe the aftershocks,investigate the damage,and guide and assist in the relief efforts.This paper describes the EERS response to the Yangbi earthquake to demonstrate the characteristics of the system and discuss the potential for further improvement. | Jianhong Liang Nan Xi Jie Liu Jingqiong Yang Hongbo Shi Zhigao Yang | 2021 | Earthquake Science2021，34，5： | 0 |
| 3 | Static and Dynamic Scaling Relationships for Moderate and Small Earthquakes in the Yunnan Region显示文摘Source spectra for moderate and small earthquakes are obtained after removing the path effect,site effect,and instrument response,etc. in the observed S-wave spectra. Based on the Brune source model and by means of genetic algorithm, the source parameters including seismic moment, stress drop, source dimension, etc. are determined, the radiated seismic energy for small-to-moderate earthquakes is measured with consideration of underestimation and compensation brought forth by limited bandwidth of the instrument,and the scaling relationships of static and dynamic parameters for earthquakes with M_L 2. 0 ~ 5. 3 in the Yunnan region are analyzed. The results show that the seismic moment is between 2. 1 × 10^(12) N·m and 1. 2 × 10^(16) N·m,and there is a linear relation of lgM_0 = 1. 01M_L + 10. 59 between the seismic moment and local magnitude. The source dimension varies from 86. 9m to 1220. 4m. The seismic moment and rupture radius remain a linear correlation of lgM_0 = 0. 003a + 12. 90. The stress drop is in the range of 0. 03 ~ 57. 55MPa,and increases with seismic moment for M_0 < 4 × 10^(14) N·m,but it doesn't vary with seismic moment for M_0 > 4 × 10^(14) N·m. The seismic moment shows dependency of corner frequency. Assuming a constant stress drop,we can obtain the relationship of lgf_c = - 1/3 lgM_0 + 5. 32 between the seismic moment and corner frequency using least squares fitting. The theoretical radiated seismic energy is between 3. 01 × 10~6 J and 2. 06 × 10^(12) J. The linear relationship between the radiated seismic energy and local magnitude is lgE_R = 1. 18M_L + 5. 69. The scaled energy increases with seismic moment for M_0 < 4 × 10^(14) N·m,however it doesn't seem to vary with seismic moment for M_0 > 4 × 10^(14) N·m. The apparent stress is in the range of 0. 02 ~ 31. 4 MPa,and also seems independent of seismic depth. | Liu Lifang Yang Jingqiong Hua Wei Su Youjin Liu Jie | 2012 | Earthquake Research in China2012，26，3： | 0 |
| 4 | Research on the Crustal Velocity Model of the Yunnan Region and Its Application显示文摘This paper selects the records of 7,412 earthquakes,each recorded by more than 10 stations in Yunnan between 2009 and 2014 to acquire the traveltime curves.Meanwhile,for improving precision,linear analysis,reduced traveltime curve and interval stability analysis are conducted focusing on the records of 83 earthquakes with M_L≥3.0 recorded each by≥80%of the stations,and by combining predecessors'research results,the initial crustal velocity model of the study area is obtained.By selecting 200 earthquakes with M≥3.0 occurring in Yunnan between 2010 and 2014,using the Hyposat batch location processing method to iterate the initial velocity model,and performing fitting to S waves layered velocity structure,we obtain the crustal velocity model for the Yunnan region,namely,the 2015 Yunnan model,with:v_(P1)=6.01km/s,v_(P2)=6.60km/s,v_(Pn)=7.89km/s,H_1=20km,H_2=21km,v_(S1)=3.52km/s,v_(S2)=3.86km/s,v_(Sn)=4.43km/s.Analysis on earthquake relocations based on the new model shows that most earthquakes occurring in Yunnan are at a depth of 10km-20km of the upper crust.The March 10,2011 M_S5.8Yingjiang and August 3,2014 M_S6.5 Ludian earthquakes are relocated,and the focal depths determined with the new model are respectively close to the precise positioning result and hypocentral distance to the strong motion stations at the epicenters,indicating that the new one-dimensional velocity model can better reflect the average velocity structure of the study area. | Yang Jingqiong Yang Zhousheng Zhang Huiyuan | 2018 | Earthquake Research in China2018，32，4： | 0 |
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