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on Septmeber 23,1999,an earthquake swarm occured in Fuzhou,Because the swarm occurred in the region where earthquaks occurred scarcely before and very close to the center of the city as well as shortly after the Jiji earthquake with Ms7.6 in Taiwan,September 21,1999,has aroused interest broadly.In this paper,we analyzed the characteristics of spatial and temporal distribution of the earthquake swarm and validated magnitude-number constituent of the swarm is special.In present theory,the earthquake swarm means that a small scale macro original rupture has formed in the layer of the crust in Fuzhou region where moderately strong earthquake risk exists. 相似文献
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Bartolome C. Bautista 《中国地震研究》2002,16(3):236-242
It has taken more than a hundred years for seismic observations in the Philippines to evolve to a modern observation system.The responsibility of seismic observations was likewise transfeered from one agency to another during this same period of time.At present,the mandate of conducting seismic observatins in the Philippines rests with the Philippine Institute of Volcanology and Seismology(PHIVOLCS),In 2000,through a grant aid from the Japan International Cooperation Agency(JICA),the Philippine Seismic netowrk was upgraded to a digital system.As a result,a new set of seismic monitoring equipments was installed in all of the 34 PHIVOLCS seismic stations all over the country,Digital waveforms are now available for high level seismic data processing.and data acquisition and processing are now automated.Included in the upgrade is the provision of strong motion accelerographs in all stations whose data can now be used for studying ground motion and intensity attenuation relations,The new setup is now producing high-resolution data that can now be used for conducting basic seismological researches,Earthquake locations have now improved allowing for the modeling and delineation of earthquake source regions necessary for earthquake hazard studies.Current seismic hazard studies in the Philippines involve the estimation of ground motion using both probabilitstic and deterministic approaches,seismic microzonation studies of key cities using microtremor observations,paleoseismology and active faults mapping ,and identification of liquefaction-prone,landslide-prone nd tsunami-affected areas.The earthquake database is now being reviewed and completed with the addition of historical events and from data from regional databases,While studies of seismic hazards were primarily concentrated on a regional level ,PHIVOLCS is now focusing on doing these seismic hazard studies on a micriolevel.For Metro Manila,first generation hazard maps showing ground rupture,ground shaking and liquefaction hazards have recently been completed.Other large cities that are also at risk from large earthquakes are the next targets.The elements at risk such as population,lifelines,and vertical and horizontal structures for each of these urban centers are also being incorporated in the hazard maps for immediate use of planners,civil defense officials,policy-makers and engineers.The maps can also now be used to describe possible scenarios during times of strong events and how appropriate socio-economic and engineering responses could be designed.In addition,a rapid earthquake damage assessment system has been started which will attempt to produce immediate or rapid assessments identification of elements at risk durin times of strong earthquakes 相似文献
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ZhuShilong 《中国地震研究》2002,16(3):210-216
As an earthquake-prone country, China has made sustained efforts in the study of earthquakes and disaster mitigation during the past several decades, with China Seismological Bureau (CSB) as the backbone of these efforts. Working towards this purpose, a series of key projects were implemented in the “Ninth Five-Year Plan” (1995-2000) to upgrade earthquake monitoring systems and to improve the supporting infrastructure, significant results in earthquake science were achieved. In the new century, we have worked out a blueprint for earthquake preparedness and disaster mitigation in the “Tenth Five-Year Plan”, which emphases 3 systems (i.e. Seismic Monitoring & Prediction, Seismic Hazards Prevention, Emergency Response), and 10 key projects in earthquake science and technology. 相似文献
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INTRODUCTIONDuetotheincreaseddemandsofmarineengineeringseismologyandseismicsafetyassessmentinlittoralmegalopolisesinrecentyears ,thestudyofhistoricalearthquakebackgroundandtheseismicitypatternsintheYellowSeaanditsadjacentareahasarousedgeneralconcern .Geog… 相似文献
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Historical earthquakes and a tsunami in Bohai Sea 总被引：1，自引：0，他引：1
王健 《地震学报(英文版)》2007,20(5):584-592
Quantitative analysis on seismicity showed that there are several seismic dense zones in Bohai Sea. These seismic dense zones of modern small earthquakes behave prominent NE orientation, although a seismic dense zone with NW direction exists actually. Taking 39°N as a boundary, seismicity in the south is different from that in north of Bohai Sea. Almost all strong earthquakes and seismic dense zones are concentrated in the southern part. Based on archives and seismic dense characteristics, we amended the epicenter of strong earthquakes in 1548 and discussed about magnitude of the earthquake in 1888. Possibility of the event in 173 as a tsunami was discussed. The event in 1597 was doubted as a strong earthquake in Bohai Sea. 相似文献
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Bruin Wechbunthung 《中国地震研究》2002,16(3):253-267
The details of seismic monitoring network and seismological work in Thailand,including some information on felt earthquakes that occured from 2000 to August 2001,are reported here. 相似文献
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ShenJun LiYingzhen WangYipeng 《中国地震研究》2005,19(1):1-11
Comparative analysis between the quantitative data of active faults and seismicity reveals that a complete earthquake recurrence cycle includes the characteristic earthquake and the submaxima earthquakes in-between. The magnitude of the sub-maxima events is correlated with the elapsed time of the characteristic earthquake and the slip rate of the fault. The fault displacement includes the major stick-slip generated by the characteristic earthquakes and the minor stick-slip by the sub-maxima ones. The magnitude-frequency relationship still works in the complete recurrence cycle. The energy accumulation in the cycle is divided approximately into four phases, and the seismicity differs at each phase. The relation of the maximum displacement with the average displacement of the characteristic earthquake suggests the partitioning of deformation between the characteristic and the sub-maxima earthquakes. Based on the above analysis, relevant mathematical equations are put forward for the quantitative assessment of the potential magnitude and earthquake risk of seismogenic tectonics. Tentative study has been carried out in this aspect in some areas of Tianshan. 相似文献
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The Characteristics of Earthquake Disasters and Countermeasures for Their Mitigation in Metropolitans 总被引：1，自引：0，他引：1
Gao Mengtan 《中国地震研究》2003,17(4):297-304
Metropolitans are a result of fast economic development in China. Many metropolitans have emerged in the eastern part of China. Earthquake disasters in metropolitans are more complicated and serious than those in a smaller city, and the impact of earthquake disaster on the economy and society is large. The characteristics of earthquake disasters and countermeasures to protect against and mitigate disaster in the metropolitan, as well as some key research fields in the earthquake disaster protection and mitigation, are discussed. 相似文献
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Introduction For a long time, the seismologists have paid great attentions to the research on the spatio- temporal distribution of earthquake intensity, which provide us with significant information for the researches on crustal stress variation, tectonic activity and earthquake risk prediction in a certain spatio-temporal region. The existing results have shown consistently that the intensity of earth- quakes is characterized by non-stability, non-linearity in temporal domain and non-uniformi… 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓｋｎｏｗｎｔｈａｔＣｈｉｎａｉｓａｎｅａｒｔｈｑｕａｋｅ ｐｒｏｎｅｃｏｕｎｔｒｙｉｎｔｈｅｗｏｒｌｄａｎｄｉｓａｌｓｏａｃｏｕｎｔｒｙｓｕｆｆｅｒｉｎｇｍｏｓｔｓｅｖｅｒｅｓｅｉｓｍｉｃｃａｌａｍｉｔｉｅｓｉｎｔｈｅｗｏｒｌｄ .Ｃｈｉｎａ’ｓｔｅｒｒｉｔｏｒｙｏｃｃｕｐｉｅｓａｂｏｕｔ 1 1 4ｏｆｔｈｅｇｌｏｂａｌｃｏｎｔｉ ｎｅｎｔａｌａｒｅａ ,ｗｈｉｌｅａｂｏｕｔ 1 3ｏｆｇｌｏｂａｌＭ≥ 7.0ｃｏｎｔｉｎｅｎｔａｌｅａｒｔｈｑｕａｋｅｓｏｃｃｕｒｒｅｄｉｎＣｈ… 相似文献
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新形势下地震监测预报发展的思考 总被引：1，自引：0，他引：1
本文从我国30多年地震监测预报历程、今后监测预报的发展方向以及改进监测预报管理工作等方面简明扼要地阐明了在新形式下如何推进地震监测预报发展的思考,文中所讨论的问题及新思维、新观点,相信对广大读者会带来更多的启迪,以此促进防震减灾事业的不断发展。 相似文献
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我国是世界上自然灾害最严重的国家之一,依靠科技进步来提高全国防灾减灾的综合能力已成为防灾减灾工作的重要内容之一。介绍了国内外防灾减灾领域科技应用与建设的现状,讨论了我国在这方面存在的主要问题;总结了国内外防灾减灾领域科技支撑建设的经验与启示,提出了增强我国防灾减灾领域科技应用能力的措施及建议。 相似文献
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2003年中国地震救灾评价 总被引：6，自引：1，他引：6
2003年，中国地震灾害救援取得巨大成就。中央地震应急资金在震后1～2天拨付到灾区，大大增强了地震救灾的能力；救灾物资走向标准化；建立中央救灾物资储备库；地震紧急救援队开始发挥作用。但在救援物资调度上还有待改进。 相似文献
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Alkali-rich igneous rocks and related Au and Cu large and superlarge deposits in China 总被引：6，自引：1，他引：6
The alkali-rich igneous rocks in China occur as fifteen linear distributed belts of each extending several hundreds to several thousands kilometers in length. These include most types of alkali-rich igneous rock categories discovered worldwide. The related Au, Cu large and superlarge deposits or metallogenic focus-areas include Dongping, Guilaizhuang, Yulong, etc. Direct and indirect genetic links have been found between alkali-rich igneous rocks and Au, Cu mineralization. The petrogenesis and metallogenesis of the alkali-rich igneous rocks are mainly controlled by (1) mantle enrichment, (2) strong interaction between mantle and crust, (3) lower contens of sulfur, high and high contents of volatiles, (4) the significant turn of regional tectonic framework from compress to extension and (5) the strong change of regional lithosphere structure. 相似文献
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我国是世界上地震灾害最为严重的国家之一。50余年的防震减灾工作实践表明,健全防震减灾法律体系对于提升我国地震灾害防御能力具有十分重要的作用。采用文献查阅、对比分析等方法,在全面梳理我国防震减灾法律体系现状的基础上,总结分析了存在的4个方面问题,并借鉴日本和美国的先进经验,提出了出台《自然灾害防治法》、修订《突发事件应对法》,适时修订防震减灾有关法律法规,进一步明确防震减灾职权主体的法定职责任务,完善地方防震减灾法律体系等对策建议。 相似文献
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Marcello Lappa 《地球物理与天体物理流体动力学》2016,110(4):348-386
Different phenomena related to the spontaneous accumulation of solid particles dispersed in a fluid medium in microgravity conditions are discussed, with an emphasis on recent discoveries and potential links with the general field of astrophysical fluid-dynamics on the one hand, and with terrestrial applications in the field of materials science on the other hand. With special attention to the typical physical forces at play in such an environment, namely, surface-tension gradients, oscillatory residual gravity components, inertial disturbances and forces of an electrostatic nature, specific experimental and numerical examples are presented to provide inputs for an increased understanding of the underlying cause-and-effect relationships. Studying these systems can be seen as a matter of understanding how macroscopic scenarios arise from the cooperative behaviour of sub-parts or competing mechanisms (nonlinearities and interdependencies on various spatial and temporal scales). Through a critical assessment of the properties displayed by the resulting structures (which appear in the form of one-dimensional circuits formed by aligned particles, planar accumulation surfaces, three-dimensional compact structures resembling “quadrics”, micro-crystallites or fractal aggregates), we discuss a possible classification of the related particle attractors in the space of parameters according to the prevailing effect. 相似文献
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Fog (haze) droplet concentrations and size distributions were measured at five sampling sites representing rural and urban regions and a highly polluted marine-urban environment. Droplet imprints in a thin gelatine layer were evaluated and compared to the measurement by light scattering instruments. This enabled conditions for the application of the logarithmic-normal size distribution and for the classification of typical fog droplet size distributions to be established. In particular, the parameters featuring the width and asymmetry of a size distribution were suggested and calculated. Advantages and drawbacks of the applied droplet sampling and evaluation technique are discussed in more detail. 相似文献