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Correlation of the slope of the initial part of P-wave envelope,hypocenter depth and plate boundary

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Geodesy and Geodynamics 2018年第6期9卷 491-497页

作者： Chao Lian Xinqiang Chen Yuyang Kong Yueqiang Qiao hubei Key Laboratory of earthquake Early Warning Institute of Seismology China Earthquake Administration earthquake Administration of hubei Province China Earthquake Administration

We investigated correlation of the slope of the initial part of P-wave envelope, hypocenter depth and plate boundaries by B-Δ method, which is used to determine epicentral distances in the Japan Meteorological agency and Japan Railway Company earthquake early warning(EEW) systems. The Tohoku region was chosen as the study region. 19,899 strong motion data for 265 events with magnitudes in the range from 5.0 to 7.6 from KiK-net(Kiban Kyoshin network) had been collected. The coefficient c to investigate is obtained from the linear relation between log B and log Δ. Compared to the hypocenter depth, the coefficients c of events is more likely to decide by the spatial correlation of the plate boundaries. The differences are likely to be due to earthquake characteristics, since deeper events in the subducting slabs the structural effects are likely to be larger than or comparable to those for shallow crust events.

关键词： The slope of the initial part of P-wave envelope B-Δ Method Plate boundary Hypocenter depth

A Quantitative Seismic Topographic Effect Prediction Method Based upon BP Neural Network Algorithm and FEM Simulation

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Journal of Earth Science 2024年第4期35卷 1355-1366页

作者： Qifeng Jiang Mianshui Rong Wei Wei Tingting Chen Shandong Seismic Hazard Prevention Center Shandong Earthquake AgencyJinan250014China Shandong Institute of earthquake Engineering Jinan250021China Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education Beijing University of TechnologyBeijing100124China Publicity and Education Center Shandong Earthquake AgencyJinan250014China Shandong earthquake Station Shandong Earthquake AgencyJinan250014China

Topography can strongly affect ground motion,and studies of the quantification of hill surfaces’topographic effect are relatively *** this paper,a new quantitative seismic topographic effect prediction method based upon the BP neural network algorithm and three-dimensional finite element method(FEM)was *** FEM simulation results were compared with seismic records and the results show that the PGA and response spectra have a tendency to increase with increasing elevation,but the correlation between PGA amplification factors and slope is not obvious for low *** BP neural network models were established for the prediction of amplification factors of PGA and response *** kinds of input variables’combinations which are convenient to achieve are proposed in this paper for the prediction of amplification factors of PGA and response spectra,*** absolute values of prediction errors can be mostly within 0.1 for PGA amplification factors,and they can be mostly within 0.2 for response spectra’s amplification *** input variables’combination can achieve better prediction performance while the other one has better expandability of the predictive ***,the BP models only employ one hidden layer with about a hundred nodes,which makes it efficient for training.

关键词： seismic topographic effect finite element method BP neural network algorithm earthquake disaster prevention

Characteristics of ground cracks caused by the M_(S) 6.4 Yangbi earthquake and the corresponding tectonic significance

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earthquake Research Advances 2022年第2期2卷 21-29页

作者： Changwei Liu Zufeng Chang Jianlin Li Yunnan earthquake Disaster Prevention Center Yunnan Earthquake AgencyKunmingChina

An M_(S)6.4 earthquake occurred near Yangbi County, Dali Bai Autonomous Prefecture, Yunnan Province, at 21:48on May 21, 2021. The earthquake location is characterized by complex geological structures, with multiple active faults distributed around the epicenter that is located at the west edge of the Sichuan-Yunnan rhombic block(25.67°N, 99.87°E). A total of 42 ground cracks are found by earthquake field investigations. The cracks are mainly concentrated in the Ⅷ degree area on the west side of the Yangbi River. Among these, 9 coseismic tectonic ground cracks generated by shear fractures are found in three villages(i.e., Akechang, Meijia-Lijia, and Huajiazhuang), which are distributed along the strike of the northwest-trending linear folds, showing the tectonic characteristics of right-lateral tension or left-stepping cracks. The structural attribute of ground cracks sustains the kinematic properties of the Weixi-Qiaohou fault, namely right-lateral strike-slip.

关键词： Yangbi earthquake Structural ground crack Weixi-Qiaohou fault Seismogenic structure

Performance of the Yangbi M_(S)6.4 earthquake disaster in different geomorphic units in Yunnan

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earthquake Research Advances 2022年第2期2卷 30-37页

作者： Jianlin Li Zufeng Chang Changwei Liu Yunnan earthquake agency Kunming650224China

An M_(S)6.4 earthquake occurred in Yangbi,Yunnan province,on May 21,*** to related investigations,the macro-epicenter of the earthquake is 6 km northwest of Yangbi County,and the seismogenic structure is the NW-trending Weixi-Qiaohou *** earthquake area is located in the hinterland of the Hengduan Mountains in the northwest of Yunnan Province,a region dominated by high and medium-high mountains,with deep canyons and tectonic basins in *** geomorphic features are derived from drastic topographic changes and huge geological differences in the earthquake *** are a variety of buildings in the earthquake-affected zone,including civil and brick-wood structures ones with weak seismic performance,as well as brick-concrete and frame ones with better seismic *** paper summarizes and analyzes different characteristics of the earthquake in different geomorphic units through field investigations of different buildings and geological disasters in the affected *** results show that under the same earthquake intensity,the damage to most buildings(located in slope areas or rooted in weak strata)is amplified by the *** earthquake has exerted an obvious propagation effect along the direction of the seismogenic ***,local ground fissures will aggravate the damage to the buildings even without surface ***,we suggest that attention should be paid to the ground fissures caused by the slope *** fissure areas may also be the disaster spot of collapses and landslides in case of a high-magnitude earthquake.

关键词： Yangbi M_(S)6.4 earthquake earthquake intensity Geomorphic unit earthquake disaster

Intensity Distribution of the Mojiang M_S5.9 earthquake in Yunnan in 2018

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earthquake Research in China 2019年第1期33卷 74-85页

作者： LU Yongkun ZHOU Yang DAI Boyang YANG Jianqiang YAN Hang Yunnan earthquake agency

The distribution of the intensity of the Mojiang M_S5.9 earthquake in Yunnan Province is expounded, and the damage characteristics of buildings and the damage ratio and seismic damage index of various building structures in each intensity area are compared with those of The Chinese Seismic Intensity Scale. The main basis and method of seismic intensity assessment are discussed in this paper. It is concluded that: ① The seismic intensity should be based on the earthquake damage of the housing structure, which takes up a high ratio in the seismic intensity assessment. It is recommended that seismic intensity is estimated by calculating the average seismic damage index. ② The highest intensity of the Mojiang M_S5.9 earthquake is Ⅷ degrees, with the long axis trending in the north-west direction. The area above Ⅶ degrees is 5,180 km^2. ③ The intensity distribution of the Mojiang M_S5.9 earthquake meets the national standard and the distribution law of seismic intensity in Yunnan.

关键词： Mojiang MS5. 9 earthquake Seismic intensity Damage ratio Seismic damage index

Study on Azimuth Variation of Airgun Signal Propagation

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earthquake Research in China 2019年第4期33卷 557-572页

作者： HE Suge ZHOU Qingyun Yunnan earthquake agency

Based on the data recorded by the observation network during the intensive excitation period from November to December 2015 at Binchuan earthquake Signal Transmitting Seismic Station(BESTSS)in Yunnan Province,the noise in waveform recording is removed by S-transform template filtering method,and the azimuth of airgun signal propagation is calculated and analyzed from the horizontal waveform *** results show that:①the azimuth angle of airgun signal after propagation is sensitive to stress change,and can clearly reflect the diurnal variation of tidal stress,which can be used to monitor the change of stress state in crustal medium;②the azimuth angle of airgun signal in some stations has changed abruptly after propagation on December 4,which may be related to the change of airgun source;③five-shot superposition or fivepoint smoothing of azimuth angle of single shot are carried out for airgun signals in stations far away from epicenter,and results show that azimuth angle from superposition or smoothing is more stable and has clear diurnal variation characteristics after propagation.

关键词： Airgun source Azimuth change S-transform Template matched filtering Crustal medium change

Study on Dynamic Characteristics of Crustal Deformation in the Yunnan Area Using GPS

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earthquake Research in China 2019年第3期33卷 478-488页

作者： WANG Yan SHAO Desheng HONG Min Yunnan earthquake agency

Based on the GPS velocity field data of 1999-2007 and 2011-2013,we used the least squares configuration method and GPS velocity profile results to synthetically analyze the dynamic evolution characteristics of crustal deformation in the Yunnan area before and after the Wenchuan earthquake. The dynamic evolution of GPS velocity field shows that the direction is gradually changed from the south in the southern part of the SichuanYunnan block to the south-west in the southern Yunnan block and there is a clear relative motion characteristic near the block boundary fault zone. Compared with the GPS velocity of 1999-2007,the results of 2011-2013 also reflect segmental deformation characteristics of the block boundary fault zone. Southeast movement shows a significant increase,which may be related to crustal deformation adjustment after the Wenchuan earthquake. The dynamic evolution of strain parameters shows a pattern of"extension in the middle and compression at both ends"in the whole area and the distribution of deformation(shear,extension or compression)is closely related to the background motion and deformation characteristics of the main fault zone. Compared with the results of the period of 1999-2007,the extensional deformation zone of 2011-2013 is expanded eastward and southward. The compressional deformation of the eastern boundary(the Xiaojiang fault zone)of the Sichuan-Yunnan block is no longer significant,which is mainly concentrated in the northern section of the Xiaojiang fault zone and may be related to the post-seismic deformation adjustment of the Wenchuan earthquake. The GPS velocity profile results show that the left-lateral slip velocity of the Xiaojiang fault zone reduced gradually from north to south(10 mm/a-5 mm/a),and the width of the northern section is wider. The right-lateral slip rate of the Honghe fault zone is about 4 mm/a,and the deformation width is wider. The dynamic results show that the Wenchuan earthquake has little effect on the deforma

关键词： Least squares configuration GPS velocity field Strain parameter GPS velocity profile

Probability Data Screening Method in Airgun Signal Processing Application

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earthquake Research in China 2019年第2期33卷 235-247页

作者： LI Jun YOU Xiuzhen HU Shufang Fujian earthquake agency

The signal excited by the airgun source is weak,and is easily affected by human motion noise,instrument failure,and earthquake and blasting events,resulting in insufficient utilization of the amplitude information of the airgun *** effective removal of interference and the preservation of true amplitude information of the signal is difficult in airgun signal *** on the randomness of noise and the highly repetitive characteristics of airgun signals,we propose probability data screening *** airgun data from experiments conducted in the Ansha Reservoir and Shanmei Reservoir in Fujian Province in June,2017 are taken as the research object to assess the effect in practical *** results show that the probability data screening method can automatically reject multiple interferences and effectively preserve the amplitude information of the signal by screening out large amplitude records in appropriate *** with direct linear superposition,the probability-related linear superposition method can effectively reduce the impact of abnormal interference,and significantly improve the quality of the observed data.

关键词： Reservoir airgun Normal distribution Linear superposition Interference removal Amplitude information

A classification method of building structures based on multi-feature fusion of UAV remote sensing images

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earthquake Research Advances 2021年第4期1卷 38-47页

作者： Haoguo Du Yanbo Cao Fanghao Zhang Jiangli Lv Shurong Deng Yongkun Lu Shifang He Yuanshuo Zhang Qinkun Yu Yunnan earthquake agency Kunming650224YunnanChina

In order to improve the accuracy of building structure identification using remote sensing images,a building structure classification method based on multi-feature fusion of UAV remote sensing image is proposed in this *** identification approaches of remote sensing images are integrated in this method:object-oriented,texture feature,and digital elevation based on DSM and *** RGB threshold classification method is used to classify the identification *** accuracy of building structure classification based on each feature and the multi-feature fusion are compared and *** results show that the building structure classification method is feasible and can accurately identify the structures in large-area remote sensing images.

关键词： Remote sensing image Building structure classification Multi-feature fusion Object-oriented classification method Texture feature classification method DSM and DEM elevation classification method RGB threshold classification method