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:Based on the data of 134 earthquakes with M≥6.0 in Chinese mainland since 1976,the paper presents a statistical analysis of the rupture types,sequence types,magnitude difference between the main shock and the largest aftershock,time interval,as well as the relationship between sequence types and small and medium-sized seismicity in the pre-mainshock epicentral region.It is found that 90%of the largest aftershocks occurred within 90 days after the main shock.According to the classification of rupture types,the proportion of main and after types in each type is more than 60%,and the proportion is higher in strike-slip type and normal fault type,while the proportion of isolated type is lower in strike-slip type,there is no isolated earthquake in the normal fault type.Isolated earthquakes usually occur in regions where earthquakes are relatively inactive,and with the increase of the magnitude of the main earthquake,the proportion of isolated sequences decreases significantly.Based on the relationship between the largest aftershock within 24 hours after the main shock and the largest aftershock,it is found that the larger the largest aftershock within 24 hours,the smaller the subsequent largest aftershock.If the magnitude difference between the largest aftershock within 24 hours and the main shock is less than one magnitude or more than 2.5 magnitude,the probability of a subsequent larger aftershock is 18.2%for the former and 89.5%for the latter.These statistical rules can be used to estimate the largest aftershocks in different time periods before and after an earthquake.

Abstract:This study focused on the public opinion guidance mechanism of post-earthquake news coverage on the reconstruction process of disaster areas and constructed an analytical framework based on agenda-setting theory and emotional motivation theory.A stratified sampling of 360 public questionnaires and media texts was collected and a hierarchical regression analysis was used to empirically examine the role of frequency of reporting,type of framing,and public participation behavior.It is found that the frequency of reporting significantly enhances the public concern for reconstruction,but there is a law of diminishing marginal effect;the heroic reporting framework effectively promotes the willingness to donate through the mediation of empathic emotion,forming a fully mediated path;the positive effect of scientific reconstruction framework on the degree of policy support is moderated by the level of public education.

Abstract:Taking Chenda Town in Sanming City as the research object,this paper discussed the application value of shallow geophysical exploration in urban earthquake prevention and disaster reduction.By adopting a detection method mainly based shallow seismic shear wave reflection exploration and supplemented by geological radar detection,the structural conditions of underground rock formations and fault distributions in this area were demonstrated.It is pointed out that shallow geophysical exploration can effectively improve the seismic capacity of cities and provide scientific basis for geological safety assessment,and it is also necessary to strengthen interdisciplinary integration and data processing accuracy to optimize urban earthquake prevention and disaster mitigation strategies.

Abstract:Due to the inability of traditional research on the seismic performance of bridge bearings to simulate different seismic scenarios and parameter changes,and the inability to conduct multidimensional evaluations of the performance of large-span bridges,the seismic performance of large-span bridge bearings is poor.To solve this problem,a large-span railway steel truss arch bridge was selected as the research object.Four different types of supports were selected,and a three-dimensional spatial finite element model of the research object was constructed by using the three-dimensional spatial finite element software Abaqus.The seismic performance of the research object's bearings under different ground motion input conditions was analyzed.The results show that the friction pendulum reduction and isolation bearings have a significant limiting function within the research object,which suppresses the longitudinal bridge deformation level of all bearings within the range of 0.85 m.The research object uses friction pendulum reduction and isolation bearings to exert corresponding constraint effects on the displacement of the main beam under seismic action.Under the influence of ground motion,friction reduction and deformation of isolation bearings are greater than their free path state,and their limiting function is activated to generate longitudinal constraints,resulting in an increase in the seismic internal force value transmitted from the upper structure of the research object to the bridge tower pier.After using friction pendulum reduction and isolation bearings,the research object can achieve collaborative seismic resistance between different bridge piers under different ground motion conditions.The research object maintains an elastic state under different seismic ground motions after using friction pendulum reduction and isolation bearings,which meets the expected seismic target.

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.