Based on the existing research results of the enhancement of the journal editors'overall qualities,this paper makes a case study of the editors of the journals of geosciences,and proposes that the editors of scientific and technological periodicals should develop five abilities,namely"ability of editing and processing","ability of subject selection and planning","ability of multi-dimensional communication","ability to use integrated media",and"ability to do academic research".Further,this paper puts forward detailed measures to improve editors'these five abilities.
The construction of earthquake intensity rapid reporting and early warning projects in Jiangsu Province has been introduced.This article recalculated the seismic monitoring capability of the Jiangsu Seismic Network and evaluated the capability of earthquake early warning.Through this project,it was discovered that the seismic monitoring capability of the Jiangsu Seismic Network has been improved.It formed the capabilities of the earthquake early warning and information service.Through analysis,it is believed that Jiangsu Seismic Network could provide certain earthquake early warning services to society.
On May 2,2022,an earthquake with a local magnitude(ML)of 4.1 occurred in Qingzhou,Shandong Province.Before the earthquake,on April 25,2022,the deep-well comprehensive observation instrument of Qingshan in Weifang Central Station showed abnormal trend variations in several observation items,including borehole component strain,vertical pendulum,pore pressure,and hydrostatic level.In order to clarify the properties of abnormal variations,Weifang Earthquake Monitoring Center Station has carried out several on-site verifications of the working state of the instrument,as well as the surrounding environment.Comprehensive analysis has been performed by analyzing the historical observation data,observation data of surrounding areas,historical earthquake data,and simulating the effects of pumping disturbance.It is considered that the synchronous trend variation of the Changyi Qingshan deep-well comprehensive observation instrument is more likely to be affected by pumping and drought during irrigation,and this abnormal change is not a precursor anomaly of the earthquake.
2023年2月6日9时17分、18时24分,土耳其连续发生2次7.8级地震,导致土耳其、叙利亚超过 5 万人遇难,数百万人流离失所.综合赴土耳其救援队队员工作记实、地震专家分析解读、新闻报道等情况后发现,土耳其这 2 次大地震灾害暴露出"三大问题",为此对云南防震减灾工作提出 5 个方面的建议.
The Yadu-Ziyun fault zone is the most active fault zone in western Guizhou and has been active since Quaternary.Many studies have been made on the active age and geometric structure of the Yadu-Ziyun fault zone,but most of them focus on the exposed fault zone,and there is no research on the hidden fault zone.This paper mainly uses field geological survey,shallow seismic exploration,borehole combined geological section,and other deep,shallow,and surface three-dimensional multi-level research methods to analyze the geometric characteristics of the Yadu-Ziyun fault zone and the relationship between deep,shallow,and surface structures,so as to fill the research gap in the activity characteristics of the hidden area of the Yaozhai fault zone in the Yadu-Ziyun fault zone.The research results show that the buried depth of the Yaozhai fault is relatively shallow,the fault characteristics are mainly left-lateral strike-slip,and the shallow seismic exploration section shows that the fault is a normal fault.However,due to the lack of SEM,TL,and OSL dating,the latest activity age of the fault cannot be judged temporarily.However,according to the comprehensive geological,remote sensing,and shallow survey data,the probable latest activity age is the late Middle Pleistocene-early late Pleistocene(Q2-Q3).
Two geo-resistivity observation systems thatuse DC and AC power supplies are operated in parallel at the Chengdu Seismic Monitoring Central Station.The observational data from January to February 2022 were selected,and the comparative analysis was carried out in terms of the observation results,anti-metro interference,and the influence on geomagnetic observations at the same station.The results show that the geo-resistivity measurement values by the two observation systems are similar.The geo-resistivity observation system by AC power supply has higher observation accuracy and better data quality.At the same time,the observation by the AC system has good anti-metro interference performance,and the power supply measurement will not cause interference to the geomagnetic observation operating at the same station.Through comparative analysis,it is beneficial to deepen the understanding of the observation system and various types of interference,and can also provide a reference for other electromagnetic observation stations.
The national earthquake intensity rapid report and early warning project is a major projectapproved by the State Council and it is an important component of China's earthquake warning system construction.It was officially implemented in 2018 and is expected to be fully completed by 2023.More than 10 000 observation stations will be built nationwide.This paper introduces the process of the Fujian general station construction project of the National Earthquake Intensity Rapid Report and Early Warning Project from station construction to acceptance,rectification,examination and operation,and station construction quality inspection,analyzes the reasons affecting the operation rate and thegeneral station base background noise level,puts forward the existing problems and the direction to be strengthened in the future.
Based on the in-phase superposition method,the transition images in the Changshu Seismic Station body strain gauge,water pipe tilt meter,and vertical pendulum observation data and the rainfall data in the corresponding time period are superimposed,and the characteristics of the change pattern of the deformation observation rainfall are analyzed.Several anomalous turning data that appear vertically during the rainfall period are superimposed in phase,and it is found that it has nothing to do with the impact of rainfall and should be affected by the stress change of the crustal tectonic activity.
Based on the calculation and analysis of the background noise of the seismic stations in Heilongjiang,the root mean square values(RMS)of the ground motion velocity of the background noise at the stations,the noise level at the stations,and the effective measurement dynamic range are obtained;the PSD curves with outstanding problems are analyzed.Finally,through the calculation of the power spectral density of each station,the interference situations of the station in different frequency bands are obtained.Analysis shows that the environmental noise level of 29 stations in Heilongjiang Province is Level Ⅰ,the environmental noise level of the Nianzishan Seismic Station is Level Ⅱ(Affected by local mining machinery vibration),and the environmental noise level at the Qitaihe Seismic Station is level Ⅳ.Except for the dynamic range observed by the Qitaihe Seismic Station,which is less than 130 dB,all other stations are greater than 130 dB.
This study summarized the seismic activity and geophysical observation anomalies in Yunnan before the Honghe MS 5.0 earthquake.The results showed thatthe Honghe MS 5.0 earthquake occurred on the ML≥4.0 seismic belt from northeast to south to southwest in Yunnan,which had been active since 2019.A new M 3.0 seismic belt,the opening of the Eshan seismic window,and the earthquake cluster activity formed rapidly one year before the earthquake,which can be used as the basis for determining the occurrence of MS 5.0 earthquakes around south-southwest Yunnan in the next six months.The anomalies of deformation and fluid observation within 200 km of the epicenter were significant.The tiltmeter and water level observations at the Shiping Seismic Station and the water temperature and gas radon observations atthe Simao Seismic Station appeared later than the rapidly formed M 3.0 seismic belt,which can be used as the basis for determining the urgency of earthquakes.
From February 4th to 11th,2006,there were 8 earthquakes of ML 4 or above at Shanxi reservoir in Zhejiang Province,with the largest earthquake being the ML 4.6 earthquake.As of December 10th,2009,a total of 1 063 small earthquakes had occurred.In order to explore the Coulomb stress variation characteristics of the main fault of 8 ML 4 and above earthquakes,as well as the promoting effect of Coulomb stress variation on subsequent earthquakes,based on the Coulomb failure criterion,the static Coulomb stress variation of the ML 4.6 earthquake swarm in Shanxi reservoir was calculated,and the influence of different effective friction coefficients on Coulomb stress variation was discussed.And calculate and discuss the impact of static Coulomb stress changes on subsequent seismic activity based on Dietrich's rate state friction law.The results show that the static Coulomb stress changes and the static friction force changes caused by the infiltration of reservoir water in 8 ML 4.0 and above earthquakes in the Shanxi reservoir have played a certain promoting role in the occurrence of subsequent earthquakes.About 76.3%of earthquakes occur in areas with positive Coulomb stress changes;the effective friction coefficient has little effect on the relationship between the Coulomb stress field and aftershock distribution;calculation of the Coulomb stress changes in the middle of F11-1,F11-2,and F11-3 branch faults showed that Coulomb stress decreased on F11-1 and F11-2 faults,and increased on F11-3 faults,indicating a greater likelihood of future earthquakes occurring near F11-3 faults.
2022 年云南省重点危险区地震监测台站改造专项资金项目原计划采购 130 万重力仪, 2022 年 11 月因拟选重力仪指标达不到业务使用要求,后变更为地球物理和测震专用设备采购.自 2022 年 11 月开始,地球物理专业设备历经 4 次招标,直至 2023 年 6 月才完成全部采购.一方面云南省地球物理台网仪器老化严重,备机备件不足,亟待加强仪器更新工作;另一方面仪器采购却经常流标.针对这一现象,通过资料收集、走访座谈,重点调研云南地球物理台网仪器更新情况,分析仪器更新工作存在的主要问题,并提出相关工作意见和建议.
On January 28,2022,an unusual low-value anomaly was observed in well water temperature at the Zhaodong Seismic Station.During the on-site verification,potential sources of interference,including the observation system,environmental factors,meteorological elements,and geothermal heat pump systems,were systematically ruled out.To address this anomaly,a set of water temperature sensors of the same model was introduced for comparative observations at the same depth,and their data variations were compared with concurrent water level measurements from the same well.Additionally,a daily average water temperature anomaly analysis was conducted within a 200 km radius around the observation well,using seismic events as a reference.The results indicated that the anomalous water temperature data exhibited irregular occurrences and significant data fluctuations,which is attributed primarily to a technical system malfunction rather than being indicative of pre-seismic anomalies.The analysis suggests that this particular water temperature anomaly was mainly due to sensor aging.This verification process serves as a reference basis for field verification of observational data anomalies at seismic monitoring stations.
Continuous gravitational observation data at the Gaotai and Lanzhou seismic stations before the Menyuan MS 6.4 earthquake were analyzed and studied.The results show that both stations observed non-tidal gravity decline changes that lasted 6 months one year before the earthquake,with variation rates of about 9.36 μGal per month at Gaotai Seismic Station and about 6.17 μGal per month at Lanzhou Seismic Station,respectively.The cumulative variation amplitudes are about 56.15 μGal and 37.05 μGal respectively.Through verification,theoretical calculation,and analysis,the disturbance of the surrounding environment is excluded.It is believed that the continuous decline in non-tidal gravity over 6 months before the earthquake may be related to the seismogenic process.The results of this study may provide an important reference for the construction of the earthquake prediction index system based on continuous gravitational observations.
China's seismic earth resistivity observation serves the medium and short-term earthquake prediction by continuously monitoring the change of underground medium resistivity with time and its spatial distribution.Since the observation was carried out in 1967,a large amount of observation data and many abnormal changes before moderate and strong earthquakes have been accumulated.Through literature research and data analysis,this paper systematically combs the earth resistivity anomalies before MS≥6.0 earthquakes in and around the observation station network.Statistical analysis shows that the ratio of observation stations with abnormal ground resistivity before earthquakes with MS≥6.0 decreases significantly with the increase of epicenter distance;The duration of anomalies before MS 6.0-6.9 earthquakes increases slightly with the increase of magnitude,and there is no phenomenon that the duration increases with magnitude before MS≥7.0 earthquakes;The duration of anomaly before MS≥7.0 earthquakes decreases with the increase of epicenter distance,but the dispersion of statistical results is large,while there is no secondary phenomenon before MS 6.0-6.9 earthquakes.On the whole,the anomaly duration in different epicentral distances does not show good regularity.
Seismic signals are typical non-stationary random signals that are susceptible to site conditions and the surrounding environment,resulting in noise interference.In this paper,the adaptive noise-complete ensemble empirical mode decomposition(CEEMDAN)method is used to analyze and preprocess the seismic data,which decomposes the seismic signal into a series of intrinsic modal functions(IMF)with different characteristic time scales.The autocorrelation calculation of each IMF component was carried out,the noisy IMF component was screened,and the noisy IMF component was denoised by the soft threshold wavelet packet method.The denoised component and the noise-free component are reconstructed to reduce noise interference and improve data quality.
Suifenhe Reference Station is a newly built reference station in Heilongjiang Province earthquake intensity quick reporting and early warning project,which is equipped with a GL-CS60B underground seismometer for seismic observation.In order to verify the observation performance of the seismometer,a GL-CS60 seismometer at the surface is used as a reference to conduct azimuth inspection and calibration calculation and compare and analyze the background noise level of the two seismometers.The results show that the parameters of the underground seismometer are up to standard,and the azimuth is 164.349°.The underground seismometer has strong anti-interference ability,especially for the suppression of human interference in the 1-20 Hz band,and the background noise level of the station reaches levelⅠ,and the observation data quality is better.
Based on 22 strong earthquakes that occurred during 2008-2022,we analyze the features of the co-seismic response of Jiangxi groundwater level and temperature and summarize post-earthquake morphology.The results show that in general,the response frequency of water level is higher than that of water temperature.The forms of the co-seismic response of water level to distant strong earthquakes are step change,oscillation,and sustained change.The co-seismic response of water temperature is mainly step change,which has two characteristics transient and continuous variation.The response patterns of the same well to different earthquakes are basically the same,different wells have different responses to the same earthquake.Based on the analysis of the mechanism of the co-seismic response of groundwater level and temperature,it is considered that the variation of different co-seismic responsesis related to the well hydrogeological conditions and observation systems.
A collocation test for the JS-120 very broadband seismometers was conducted with the methods of two and three seismometers at the Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards.We selected 600 hours of continuous observation record samples and extracted typical self-noise values with advantage probability based on the sub-band probability statistics method to analyze differences in test results.The results show that the three seismometers method can correct the transfer function difference between seismometers through the ratio of cross-power spectra,and the result is lower and more stable than the two seismometers method.When the performance of seismometers differs,seismometers with higher self-noise will affect the coherence of the records,leading to higher self-noise results for other seismometers.Due to inconsistencies in the installation process,the shape of the seismometers'self-noise power spectrum curves change in the range of 0.1 to 1 Hz close to the secondary microseism frequency band,and the performance of the two seismometers method is more obvious.In the low-frequency band below 0.04 Hz,the seismometer self-noise level is relatively high,which is close to the observation ambient noise.The influence of seismometer self-noise in the low-frequency band should be considered when the selection of observatories for scientific experiments with low noise and the evaluation of ambient noise level was conducted.
In 2015-2016,most stations of Manwan and Xiaowan reservoir seismic monitoring networks stopped working one after another.In 2019,a total of 18 stations of the two networks were optimized,restored,and rebuilt.After the optimized replacement and restoration of the equipment of the seismic stations and the central computer room,the operation rate of the 13 stations in the reservoir seismic network is over 95%,and the lower limit of the seismic monitoring capability of the reservoir monitoring area is up to ML 0.3,the monitoring capability was better than that before restoration.The restoration and reconstruction of the seismic monitoring network of Manwan and Xiaowan reservoirs have improved the seismic monitoring capability of the reservoirs in the monitoring area and play an important role in promoting the development of earthquake prevention and disaster reduction and the security of People's livelihood.
