新疆乌恰5.1级地震强震动记录及震中区烈度考察对比分析     

何金刚  史勇军  吴国栋  胡伟华 《内陆地震》2011,25(3):247-254

2011年1月1日新疆乌恰县西南发生MS 5.1地震,新疆强震动台网布设在震中附近的10个强震动固定台获取了这次地震完整的加速度记录,记录的最大加速度为80.08 cm.s-2。对10个强震动台的加速度记录进行了常规数据处理,计算了地震烈度,并将计算的仪器烈度与现场地震宏观考察烈度进行了比较,有较好的一致性。  相似文献   

Seismic stratigraphy and subsidence analysis of the southern Brazilian margin (Campos,Santos and Pelotas basins)     

Jorham Contreras  Rainer Zühlke  Scott Bowman  Thilo Bechstädt 《Marine and Petroleum Geology》2010

The Campos, Santos and Pelotas basins have been investigated in terms of 2D seismo-stratigraphy and subsidence. The processes controlling accommodation space (e.g. eustacy, subsidence, sediment input) and the evolution of the three basins are discussed. Depositional seismic sequences in the syn-rift Barremian to the drift Holocene basin fill have been identified. In addition, the subsidence/uplift history has been numerically modeled including (i) sediment flux, (ii) sedimentary basin framework, (iii) relation to plate-tectonic reconfigurations, and (iv) mechanism of crustal extension. Although the initial rift development of the three basins is very similar, basin architecture, sedimentary infill and distribution differ considerably during the syn-rift sag to the drift basin stages. After widespread late Aptian–early Albian salt and carbonate deposition, shelf retrogradation dominated in the Campos Basin, whereas shelf progradation occurred in the Santos Basin. In the Tertiary, these basin fill styles were reversed: since the Paleogene, shelf progradation in the Campos Basin contrasts with overall retrogradation in the Santos Basin. In contrast, long-term Cretaceous–Paleogene shelf retrogradation and intense Neogene progradation characterize the Pelotas Basin. Its specific basin fill and architecture mainly resulted from the absence of salt deposition and deformation. These temporally and spatially varying successions were controlled by specific long-term subsidence/uplift trends. Onshore and offshore tectonism in the Campos and Santos basins affected the sediment flux history, distribution of the main depocenters and occurrence of hydrocarbon stratigraphic–structural traps. This is highlighted by the exhumation and erosion of the Serra do Mar, Serra da Mantiqueira and Ponta Grossa Arch in the hinterland, as well as salt tectonics in the offshore domain. The Pelotas Basin was less affected by changes in structural regimes until the Eocene, when the Andean orogeny caused uplift of the source areas. Flexural loading largely controlled its development and potential hydrocarbon traps are mainly stratigraphic.  相似文献   

青岛海湾大桥变形监测方案及应用分析     

韩晓冬  黄鹏  王新文  张志刚 《测绘科学》2010,35(3):176-177

在众多变形监测的方法中,GPS无疑是最有效的手段之一,特别是在像海湾大桥这样需要连续监测的建筑中。但是由于GPS成本过高,而限制其发展,本文中通过分析几种监测的方法,选择GPS多天线阵列变形监测系统能很好地解决这一问题。此系统拥有与常规GPS监测方法相当的精度,但是大大地降低了成本。可以应用于青岛海湾大桥的变形监测中。  相似文献   

像平面坐标到经纬度坐标的转换   总被引：2，自引：2，他引：0  

张金金  梁洪有  陈兴峰  顾行发  余涛  葛慧斌 《地理空间信息》2010,8(1):63-66

坐标转换是所有的遥感、GIS、航测等软件都必须具备的一个基本功能,在功能实现中会遇到大规模的矩阵运算问题,而灵活运用IDL编程工具中的结构数组运算能大大地简化计算步骤,加快图像处理的速度。本文运用IDL设计了坐标转行算法,对于一幅row(行)、col(列)的图像,在已知该幅图像其中一个像元点在图像中的像元位置和经纬度坐标的情况下,利用该算法能够实现整幅图像中所有点的经纬度坐标的计算,并验证了其正确性。  相似文献   

Seismic Activity in the Himalayan Orogenic Belt and Its Related Geohazards     

Ling Bai  Bowen Song  Guohui Li  Yong Jiang  Sanjev Dhakal 《地球科学进展》2019,34(6):629-639

Himalayan orogenic belt is the highest and largest continental collision and subduction zone on the Earth. The Himalayan orogenic belt has produced frequent large earthquakes and caused several geohazards due to landslides and housing collapse, having an impact on the safety of life and property along a length of over 2500 km. Here we took three earthquake clusters as examples, which occurred at Nepal Himalaya, eastern Himalayan syntaxis and western Himalayan syntaxis, respectively. Here we calculated the earthquake locations and fault plane solutions based on the waveform data recorded by seismic stations deployed in source areas by the Institute of Tibetan Plateau Research, Chinese Academy of Sciences. We found that at the Nepal Himalayan, the Main Himalayan Thrust is the major tectonic structure for large earthquakes to occur. At the eastern Himalayan syntaxis, most earthquakes are of the reverse or strike-slip faulting. The major tectonic feature is the combination of the NE-dipping thrust with the southeastern escape of the Tibetan plateau. At the western Himalayan syntaxis, intermediate-depth earthquakes are active. These observations reveal the geometry of the deep subduction of the continental plate with steep dipping angle.  相似文献   

Study on Multi-Parameter Seismic Observation Technique Based on Optic Fiber Sensing     

Wenzhu Huang  Wentao Zhang  Fang Li 《地球科学进展》2019,34(4):424-432

”Deep well, wide band, multi-component comprehensive observation” is the development direction of seismic observation. In order to promote the application and development of underground integrated observation system, key technologies, such as high temperature resistance sensor, interference isolation of sensor unit and miniaturization of instrument, need to be developed. Optic fiber sensors have the advantages of small size, passive nature, resistance to electromagnetic interference, being easy to long distance transmission and multi-parametric network observation, which are expected to provide new technology for the comprehensive observation of multi-parameter earthquakes in deep wells. This paper proposed a comprehensive observation technique of seismic wave, crustal deformation and temperature. An integrated borehole seismic sensor based on fiber Bragg grating resonators was designed for measuring three-component earthquake, three-component crustal deformation and temperature signal. A new technique for simultaneous measurement of multi-parameters of temperature and strain of fiber based on effective cavity length was presented. The technique of high precision optical fiber signal demodulation based on single side band sweep laser and the design of multi-parameter integrated optical fiber probe were introduced. The resolution of strain and temperature measurement of the fiber multi-parameter sensor system reached 4.7 \times 10^-10 and 6×10^-5 ℃ , respectively. A comprehensive multi-parameter earthquake observation experiment was carried out at the seismic station. The results show that the integrated optical fiber multi-parameter seismic observation system can simultaneously record the earth tide signal, seismic wave signal and environmental temperature disturbance, and has good anti-environmental interference ability and long-term stability, which is expected to provide a new technique for crustal deformation observation.  相似文献   

南华县建设工程抗震设防管理探析     

李恒枝 《高原地震》2014,26(4):33-37

地震是群灾之首,地震灾害不可抗拒,只能防御,建设工程进行合理的抗震设防是震灾预防的关键环节,规范各类建设工程抗震设防管理是社会抵御地震灾害最为有效的途径.对南华县抗震设防管理现状和存在的问题进行深入分析后,提出了进一步规范抗震设防管理的对策意见.  相似文献   

拟建哈—佳铁路工程地震安评抗断参数研究——以依兰-伊通断裂为例   总被引：1，自引：1，他引：0  

余中元  韦庆海  王丽梅  马艳丽  张立忱  欧阳兆国 《震灾防御技术》2014,9(1):53-63

在对依兰-伊通断裂通河段晚第四纪活动参数获取的基础上,对该断裂的几何学特征和晚第四纪活动特征及有关拟建铁路地震安全的设防参数进行了探讨.研究结果表明,依兰-伊通断裂通河段总体走向N30-40°E,由3条断层组成,中支最新活动时代为全新世.该断裂未来发生7级地震时的水平位移量可能达2.2m左右,垂直位错量约为1.1m左右.该断裂全新世以来的活动性质表现为右旋走滑为主,兼具逆冲活动.根据探槽结果和野外地震地质调查得出断裂垂直位错约（1.0±0.2）m,右旋位错量约为（2.7±0.1）m,（1730-30）aB.P.以来的垂直滑动速率和水平滑动速率分别约为（0.57±0.11）mrn/a和（1.57±0.06）mm/a.未来100年内若遭遇地震,其最大水平位错量约2.87m,垂直位错值为1.04m.断层影响带宽度约为8m.该研究结果为拟建哈—佳铁路工程可能遭受的断层影响和抗震设防提供了一定的数据基础,也为地震安评中线状工程的抗断评价问题提供了一定的参考.  相似文献   

新地震区划图地震构造区划分的原则和方法——以中国东部中强地震活动区为例   总被引：1，自引：1，他引：0  

高战武  陈国星  周本刚  周庆  雷清清 《震灾防御技术》2014,9(1):1-11

在新编全国地震区划图潜在震源区划分工作中,采用了三级划分的技术思路,即在地震统计区内先划分出地震构造区,以控制地震统计区内地震构造和地震活动的差异性,然后,在地震构造区内再进行潜在震源区划分。地震构造区划分是新编全国地震区划图潜在震源区划分工作中的一个关键环节。本文论述了地震构造区的定义、作用、划分原则和依据等。介绍了中国东部地区地震构造区划分方案,并以东北地震区和华南沿海地震带为例,对地震构造区划分方案进行了详细论述。  相似文献   

玉溪市自建民居的抗震性能分析     

李亚琦  贺秋梅  张江伟 《震灾防御技术》2014,9(1):103-109

由于施工、材料、改建等因素的影响,自建民居往往达不到抗震设防的目标.本文以玉溪市某社区房屋为例,利用砖混结构的震害预测计算方法,探讨了加层及底层改建的做法对自建民居抗震性能的影响.计算分析结果表明：加层会减低民居的抗震性能,层数越多,抗震性能越弱,而底层改建更明显地降低了民居的抗震性能.  相似文献