Abstract:The main urban area of Weifang City is densely populated and located near the earthquake fault zone,so the earthquake risk is relatively high.In order to analyze the distribution suitability of 93 earthquake emergency shelters in the main urban area of Weifang City,this paper used ArcGIS software to carry out buffer analysis,kernel density analysis,and calculation of the nearest distance from the shelter to the fault,and adopted entropy weight method to evaluate the suitability.The analysis shows that:The number of shelters in the east of Kuiwen District,the north of Hanting District(Binhai District and Jingkai District),and the southeast of Fangzi District(Xiashan District)is obviously too small to cover effectively.The distance from the shelter to the fault is too close.67 of the 93 shelters are 0-2000 m away from the fault,accounting for 72.0%.The distance from the shelter to the supermarket has become an important factor affecting the rating of the suburban shelter.The open land on the edge of densely populated areas is a good choice for the construction of earthquake emergency shelters,and the current development and utilization are not sufficient.After a comprehensive analysis,it is concluded that the number of emergency shelters in the new functional areas in the main urban area of Weifang City is too small,and the supporting basic settings of the shelters built in this area need to be improved.It is recommended to add large shelters in places far from the fault zone.

Abstract:Social media has become the core carrier for disseminating emergency information and intensifying public opinions.This study took the Liupanshui MS4.6 earthquake in Guizhou Province on July 24,2024 as an example,collected text,address,and time data from social media within 48 hours after the earthquake.This study investigated the focus themes,emotional characteristics,spatial distribution,and temporal changes of public opinions on this earthquake.The research results indicate that the peak of event discussion occurs 4 hours after the earthquake,with themes including earthquake zone safety,earthquake sensation description,earthquake event experience,blessings,and gratitude.In terms of emotional evolution,neutral emotions account for a relatively high proportion in the early stage,and they gradually turn into positive emotions as there are no reports of casualties or property damage within 20 hours after the earthquake.In terms of spatial distribution,comments are mainly concentrated in the Guizhou region,particularly the provinces and surrounding areas where earthquakes have occurred,as well as the central and eastern regions.The results of this study can provide decision support or theoretical reference for post-earthquake network public opinion analysis and disposal in areas with fewer earthquakes.

Abstract:Based on the importance-performance analysis(IPA)method,this paper compared the differences in evaluation of the importance and satisfaction of earthquake early warning publicity among teachers in urban and rural areas and schools that have received early warning information.The results show that in terms of content,the publicity knowledge is distributed in four quadrants.The knowledge with strong practicality and high guidance is of high importance and satisfaction,and the principle-based knowledge with high difficulty in understanding and poor practicality is of low importance and satisfaction.Among them,the practical knowledge of schools that have not received early warning information is concentrated in the first quadrant.In terms of publicity intensity,it is generally in the fourth quadrant.Urban schools have greater publicity intensity and higher satisfaction than rural schools.Schools that have not received early warning information have more urgent demand for early warning knowledge.In terms of publicity methods,the contradiction between high demand and low recognition of earthquake early warning publicity methods is the consensus of school teachers,and this index is located in the fourth quadrant.

Abstract:The suddenness and destructiveness of earthquake disasters pose severe challenges to emergency response systems.Traditional drill models,lacking a behavioural science perspective,result in low conversion rates of self-rescue skills,failing to meet the modernisation requirements of the national emergency management system.Based on the theory of protective motivation and the theory of planned behavior,this study designed a questionnaire and collected 248 valid responses,identifying four self-rescue behavior patterns:precise executors,mechanical followers,experience-misguided individuals,and incapacitated panic-stricken individuals.The study proposed targeted optimization strategies,including designing advanced training programs,establishing a decentralized training system,addressing cognitive rigidity,and overcoming the mind-body decoupling dilemma,so as to facilitate a transition from standardized drills to precision-oriented training.

Abstract:Earthquake disasters seriously threaten the safety of human society,and the accuracy of disaster information dissemination directly affects public emergency response effectiveness.Based on the characteristics of disaster news reporting and information processing mechanisms,this study collected 333 valid questionnaires by questionnaire survey method,and analyzed the influence mechanisms of education level,gender characteristics,and geographic location on the cognitive differences of disaster information by independent samples T-test and one-way analysis of variance(ANOVA),and the results reveal that the education level affects the credibility of the information and the guiding judgement of actions,and intensifies the cognitive differentiation within the group by regulating the level of scientific literacy.Therefore,it is suggested to establish a hierarchical information system that is appropriate for the education level so that accurate information can be conveyed through the construction of an information hub in the whole region to achieve emergency guidance.

Abstract:The Zhamutu Wulan Gold Deposit in Inner Mongolia is located within the metallogenic belt of gold,silver,copper,lead,zinc,platinum,molybdenum,boron,graphite,and talc along the northern margin of the North China Plate.In recent years,gold deposits such as the Changshanhao and Saiyinwusu have been discovered,making it a promising area for gold exploration.To further investigate the metallogenic geological characteristics of the Zhamutu Wulan Gold Deposit,this study analyzed the regional geological and geochemical features,employed digital geological survey methods,and combined geological and geochemical data from the study area.By referencing the metallogenic characteristics of known deposits both within and outside the region,the study proposed the key exploration indicators for altered rock-type gold deposits in fault zones:fault fracture zones,multi-element(such as Au,As,and Sb)geochemical anomaly areas,and silicification and limonitization phenomena formed after alteration of the surrounding rocks.Based on these exploration indicators,three prospective exploration targets were delineated within the study area,including one A-grade gold target and two B-grade gold targets.This study aims to provide guidance for future exploration efforts and offer a reference for the discovery of similar deposit types in the region.

Abstract:Taking a mega landslide area in Guangdong Province as an object,this paper innovatively adopted a sky-earth synergistic three-dimensional investigation method,integrating the application of ground-penetrating radar and three-dimensional oblique photography to carry out a comprehensive investigation and analysis of landslides.Ground-penetrating radar utilized high-frequency and low-frequency dual-channel antennas to detect the underground structure and sliding surface characteristics,and revealed the fissure development and hydrological characteristics of the landslide body.Three-dimensional oblique photography visualized the surface morphology of the landslide area,the distribution of the fissures,and the sliding characteristics through the high-precision three-dimensional model.The results show that the joint application of the two technologies effectively compensates for the limitations of a single means,realizes the organic integration of surface and underground information,and can accurately reveal the spatial structure and sliding mechanism of landslides,providing a scientific basis for the monitoring and early warning of landslide hazards and prevention and control measures.The multi-technology joint investigation method proposed in this paper has high practicality and popularization value,and can provide reference for the comprehensive study of geological disasters.

Abstract:In view of the short construction period required by the construction unit of Zhuhai industrial project,PHC500 pipe pile foundation is given priority.However,for the site with isolated stone or silt stratum directly to the strongly weathered granite or medium weathered granite site,the damage ratio of hammered pipe pile is high,and the construction of pilot holes is required.This paper compared the cost,efficiency,and technical characteris-tics of three methods:long auger drill pilot holes,rotary excavator pilot holes,and drill hammer pilot holes.The long auger drill method struggles to penetrate rock,and the rotary excavator method has low construction efficiency in hard rock strata.Although the drill hammer method has a relatively high unit price,it offers superior efficiency in hard rock strata due to the impact of air-driven hammers,resulting in significant overall benefits.

Abstract:This study focused on the Shaoguan and its surrounding areas,utilizing a total of 546 scenes of ascending and descending SAR data from the LT-1 Satellite from July 2023 to March 2024.Using the Stacking-InSAR method,the paper conducted early identification research on landslide hazards,and summarized 11 remote sensing identification features,including micro-topography,deformation damage signs,and primary threat objects.By combining optical remote sensing images with a resolution better than 1 meter from April 2024 and field verification,the effectiveness of LT-1 in identifying landslide hazards in vegetation-covered areas was validated.The results show that 116 suspected landslide hazards were identified by using LT-1 satellite,and 70 sites were confirmed as potential risks through field verification,with an identification accuracy of 60.3%.This indicates that the Stacking-InSAR method based on LT-1 satellite can effectively detect the distribution of landslide hazards,and provides critical technical support for the early identification and comprehensive defense against landslide hazards.

Abstract:The vibration table model test of indoor slope is a reduced scale model test.The preparation of similar materials that can reflect the static and dynamic characteristics of rocks is related to whether the model test results can be correctly reversed to the prototype.This paper focused on the mechanical properties and failure modes of similar materials in the range of strain rates in vibration table tests.The results show that:Within the range of strain rates determined by the vibration table model test in this paper,the elastic modulus and crack initiation stress of similar materials of rocks basically do not change with the increase in strain rates,and the uniaxial compressive strength,peak strain,and the number of micro-cracks show three-step changes as a whole.Compared with real rocks,similar materials are more sensitive to strain rates.When the strain rate is greater than 0.5 s-1,the failure mode of similar materials changes,and the failure degree increases significantly,which will lead to the exaggerated failure degree of the prototype slope rock mass after entering the nonlinear deformation stage.Therefore,the calculated strain rate of the model should be controlled within 0.5 s-1.

Abstract:In order to solve the problem of complex structure imaging in seismic exploration,the proposed marine secondary three-dimensional(3D)acquisition based on target exploration in recent years mainly focuses on wide azimuth and high coverage,but the difficulty of construction and acquisition costs have doubled.According to the current demand for cost reduction and quality and efficiency improvement,the seismic profiles of forward modelling from five different streamer acquisition and observation systems were compared by experiments,and it was concluded that the effect of seismic profiles by"plug-line"acquisition fusion was equivalent to that by high-density acquisition.Based on the results of forward modeling,a new and old 3D"plug-line"high-density streamer acquisition and observation system was designed for the first time in China.At the same time,technical research was conducted on the fusion processing of new and old 3D seismic data,forming a set of new and old 3D"plug-line"high-density acquisition and data processing technologies.Compared with the conventional acquisition and observation system,new and old 3D"plug-line"acquisition increased the gun channel density per unit area,reduced the seismic acquisition bin,and significantly enhanced coverage times,and it could obtain high-quality high-density seismic data results.The application in the paleogene complex structural zone in the M area of the South China Sea shows that the new and old 3D"plug-line"acquisition can effectively improve the imaging quality of seismic data and effectively support the exploration target evaluation.It is of great reference significance for secondary 3D exploration and deployment in other sea areas.

Abstract:This paper,in conjunction with the actual work of data quality maintenance for the seismic network in the Fujian region,aims to analyze the data quality of more than 1300 seismic observation stations in the Fujian region in a process-oriented and quantitative manner,with the starting point of improving the usability of observed data.The paper introduced the data quality analysis process,evaluation indicators,and business-oriented analysis and processing software of the Fujian Seismic Data Center,and proposed plans for future data quality monitoring and analysis.Through comprehensive analysis by using multiple technical means,multi-level monitoring,and multi-alarm dimensions,a full-dimensional assessment of the quality of seismic observation data and its daily business operation has been achieved,which helps to enhance the disaster mitigation and scientific benefits of seismic observation data.

Abstract:The study analyzes the temporal patterns of M≥4 earthquakes(removing aftershocks)in the southeast coastal seismic zone since 1974.The results reveal that these earthquakes exhibit a pattern of grouped occurrence.Firstly,the paper establishes the criteria for identifying the onset and termination of such grouped episodes:If an M≥4 earthquake occurs within 0.75 years after the end of the previous group of seismic activities,the new group of seismic activities is considered to have started,and the occurrence time of the first earthquake(initial earthquake)is taken as the start time of the group of seismic activities.If no earthquake occurs within 417 days(the maximum time interval between earthquakes within the group)after an earthquake,the group of seismic activities is considered to have ended,and the occurrence time of the last earthquake within the group is taken as the end time of the group of seismic activities.At the same time,this paper summarizes three prediction indicators.Indicator 1∶Within 4.1 years following the first earthquake,multiple M≥4 earthquakes,potentially including M≥5 events,may occur in this seismic zone.Indicator 2:Between 25 and 275 days after the first earthquake,there is potential for another M≥4 earthquake in the zone.Indicator 3:An M≥5 earthquake may occur within 53 to 320 days after the first earthquake.Finally,by integrating the criteria for determining the onset and termination of such grouped activity with these three prediction indicators,this paper proposes an evaluation and prediction plan for M≥4 earthquakes in the Southeastern Coastal Seismic Belt,along with implications of the Qingyuan M4.3 earthquake for evaluating subsequent seismic activity patterns.

Abstract:Based on the results of the First National Census for Natural Disaster Risk,on the basis of studying the evaluation index system of earthquake prevention and disaster reduction ability of different scholars at different scales,an evaluation indicator system suitable for the central urban area of megacities is proposed by using the comprehensive evaluation algorithm model of entropy weight-Topsis method,and the central urban area of Tianjin was taken as an example for application.The results show that the overall earthquake prevention and disaster reduction capacity is still weak.Only one area has reached a strong level,three areas at a weak level,and the remaining areas at a medium level.In areas with higher economic development,the earthquake disaster preparedness capacity is stronger,but the denser the wealth of personnel,the higher the risk of economic loss.There is also a phenomenon where"a few areas occupy most resources"in terms of earthquake disaster relief capacity.The proposed suggestions provide valuable references for enhancing earthquake disaster prevention and mitigation capabilities in central urban areas of megacities,ensuring rational resource allocation,and leveraging the guiding role of earthquake departments in disaster prevention and mitigation.

Abstract:Compared with conventional orthogonal connected structures,oblique connected structures exhibit more complex mechanical behaviors under seismic actions.The connection method between the connector and tow-ers serving as a critical influencing parameter.This study focused on an asymmetric oblique weakly connected struc-ture of dual connectors and predominantly conducted comparative analysis on seismic performance under the con-nection stiffness variation schemes of three kinds of bearings.The results indicate that:As the stiffness of each con-nector bearing increases,the natural vibration period of the structure decreases,while the variation amplitudes of base shear and displacement increase with the number of stiffness-modified bearings.The control effect on displace-ment increases in the direction with lower lateral stiffness.The load stress of the double-layer connector increases with bearing stiffness,while that of the single-layer connector shows no distinct pattern.Bearing relative displace-ment generally decrease,and the shear forces on the edge columns of towers connected to double-layer connectors exhibit a generally increasing trend along seismic action directions,whereas those connected to single-layer con-nectors demonstrate more complex load stress situations.When modifying unilateral bearing stiffness,the transla-tional vibration modes of corresponding main structures experience greater impacts,with relative displacements and edge column shear variations exceeding those on unmodified sides.Stiffness adjustment in individual connector minimally affects translational vibration modes and seismic responses of other connectors.Therefore,these conclu-sions provide valuable references for scheme selection and design of asymmetric oblique weakly connected struc-tures.

Abstract:The BZ-X Gas Field located in the Bohai Bay Basin first revealed a fracture-pore glutenite gas reservoir with huge thickness in Paleogene Kongdian Formation,which indicates that the glutenite formation in deep Kongdi-an Formation in Bozhong Sag also has great exploration potential.Meanwhile,drilling studies have confirmed that the abnormal pressure characteristics of the formation are obvious.It is of great significance to obtain accurate pre-drilling pressure prediction results in oil and gas field exploration and development to ensure drilling safety.With the development of the nonlinear mathematical theory of artificial intelligence,the paper introduced the amplitude variation with frequency(AVF)information in frequency division inversion in the research area.By taking the pres-sure measurement data of the drilled cable as the quality control condition,the nonlinear mapping relationship be-tween logging data and different frequency division seismic attributes was established by the support vector machine algorithm in machine learning.This prediction method could accurately reveal the pressure distribution characteris-tics of glutenite formation,and the formation pressure prediction results obtained are more accurate and reliable than the linear statistical method,which also points out a new direction for the prediction of abnormal pressure of special lithologic formation in the Bohai Bay Basin.

Abstract:To study the deformation characteristics of loess under the moisture-pressure-vibration coupling,dynamic simple shear tests were conducted on undisturbed Q3 loess under initial water contents of 5%,10%,15%,and 20%,consolidation pressures of 50,100,150,and 200 kPa,and dynamic shear strain amplitudes of 0.15%,0.5%,1.0%,2.2%,3.3%,and 4.5%.The test results show that both the seismic subsidence and its single-cycle increment increase with the shear strain.Under low water content conditions,the seismic subsidence deformation increases significantly as consolidation pressure increases.Under high water content conditions,the compression-vibration effect shows different patterns of influence on seismic subsidence deformation.Under low consolidation pressure conditions,seismic subsidence deformatopn increases significantly with the increase of water content,while under high consolidation pressure conditions,the moisture-vibration effect also shows different patterns of influence on seismic subsidence deformation.It is concluded that shear strain amplitude,consolidation pressure,and water content have obvious effects on the seismic subsidence of loess,with the increase of any influencing factor leading to larger seismic subsidence.The influence of consolidation pressure and water content on seismic subsidence deformation needs to consider the coupling effect between them.When either variable reaches a critical value,the influence of the other variable will become relatively weak.

Abstract:With the expansion of the scale of deep resource exploitation,mine earthquake disasters continue to in-tensify.High-frequency and high-energy catastrophic events pose severe threats to production safety and disrupt re-gional ecological chains.Traditional management methods face bottlenecks such as delayed monitoring responses,coarse engineering interventions,and disproportionate ecological restoration when dealing with complex geological conditions and multi-field coupled disaster mechanisms.Through the synergistic effect of hydrological regulation,rock mass modification and environmental restoration,hydrogeological and environmental geotechnologies provide innovative solutions for the"monitoring-governance-restoratio"full-chain prevention and control of mine seismic disasters.This paper systematically discusses the theoretical evolution,technology integration and engineering par-adigm of hydraulic enviroment geological technology,aiming to promote the formation of a more perfect theoretical framework of disaster prevention and control and a standardized engineering application system in this field.

Abstract:In order to study the seismic capacity of old masonry buildings widely distributed in Zhejiang urban area,this paper takes a typical multi-story masonry building which does not meet the requirements of the current seismic design code as the object,and uses the seismic capacity index method and time history analysis method to analyze its seismic capacity.The results of the seismic capacity index method show that the average seismic capacity index of the middle floors of the masonry structure is relatively low,which can be preliminarily judged as the seismic weak link of the building.The results of time history analysis show that under the action of small earthquake,medium earthquake and large earthquake with seismic fortification intensity of 7 degrees(0.10 g),the highest inter-story displacement angle occurs mainly on the second floor(in the X direction).Based on the three design seismic accelerations,five seismic acceleration time histories that meet the characteristics of the engineering site are selected for structural numerical simulation analysis.It is concluded that the average inter-story displacement angles of the building are 1/1356,1/408 and 1/230,respectively.According to the classification of earthquake damage to buildings and special structures,the damage state of the masonry structure is slight damage,medium damage and serious damage.The analysis results of the two methods are in good agreement,and the seismic capacity level of the typical masonry structure is preliminarily determined.

Abstract:To assess the geological disaster hazard of slope collapse in mountainous areas of eastern Guangdong,this study selected Meixi Town as the representative research area.An evaluation index system was constructed com-prising the following factors:slope,aspect,plan curvature,profile curvature,stratigraphic lithology,distance from fault,distance from water system,normalized difference vegetation index(NDVI),distance from building,distance from road,and land use types.Then,a susceptibility evaluation was conducted by SMOTETomek hybrid sampling integrated with machine learning and deep learning models,including random forest(RF),gradient boosting decision tree(GBDT),3D convolutional neural network(3D CNN),and graph attention network(GAT).Based on the optimal model,precipitation analysis was incorporated to complete the risk assessment.The results show that models based on SMOTETomek hybrid sampling generally achieve higher accuracy,and the SMOTE-Tomek-GAT model has the highest precision,with an AUC value of 0.93.