稳定的频率域提取接收函数方法研究   总被引：2，自引：1，他引：1       下载免费PDF全文

张洪双  田小波  滕吉文 《地球物理学报》2009,52(10):2483-2490

频率域提取接收函数时引入“水准量”来代替垂向分量频谱中比较小的成分以保证反褶积结果的稳定性,却降低了精度,尤其对反映深部壳幔结构的低频信息影响较大;实际的等效震源时间函数长度是有限的,由于地震记录上后续干扰震相能量的影响,垂直分量波形往往比较复杂,若将其直接作为等效震源时间函数必然影响所提取接收函数的精度.针对以上问题,本文改进“水准量”的使用方法,并采取折中方案选取“水准量”和等效震源时间函数的长度,以便在频率域反褶积中得到稳定的接收函数,同时提高反褶积的精度.对观测数据的试验效果显示,本文方法提取的接收函数稳定性好、精度高,是一种有效的提取台站高质量接收函数的方法.  相似文献   

豫冀鲁不同级序旋扭构造体系和油气富集规律   总被引：1，自引：1，他引：0  

李红南  刘伟  蔡传强  刘泽蓉 《地质力学学报》2009,15(4):385-395

新华夏系第二沉降带华北沉降区受郯庐断裂中新生代应力方式及应力场的影响,广泛发育了不同级序旋扭构造体系,控制了不同级序复式油气聚集区带的形成分布。油气主要富集在内旋回层和撒开端,弧形断裂内侧和构造运动活跃期形成的低级序扭动构造中,对指导油气勘探开发有重要意义。   相似文献   

Gravity anomaly, lithospheric structure and seismicity of Western Himalayan Syntaxis     

V. M. Tiwari  R. P. Rajasekhar  D. C. Mishra 《Journal of Seismology》2009,13(3):363-370

A compiled gravity anomaly map of the Western Himalayan Syntaxis is analysed to understand the tectonics of the region around the epicentre of Kashmir earthquake of October 8, 2005 (Mw = 7.6). Isostatic gravity anomalies and effective elastic thickness (EET) of lithosphere are assessed from coherence analysis between Bouguer anomaly and topography. The isostatic residual gravity high and gravity low correspond to the two main seismic zones in this region, viz. Indus–Kohistan Seismic Zone (IKSZ) and Hindu Kush Seismic Zones (HKSZ), respectively, suggesting a connection between siesmicity and gravity anomalies. The gravity high originates from the high-density thrusted rocks along the syntaxial bend of the Main Boundary Thrust and coincides with the region of the crustal thrust earthquakes, including the Kashmir earthquake of 2005. The gravity low of HKSZ coincides with the region of intermediate–deep-focus earthquakes, where crustal rocks are underthrusting with a higher speed to create low density cold mantle. Comparable EET (∼55 km) to the focal depth of crustal earthquakes suggests that whole crust is seismogenic and brittle. An integrated lithospheric model along a profile provides the crustal structure of the boundary zones with crustal thickness of about 60 km under the Karakoram–Pamir regions and suggests continental subduction from either sides (Indian and Eurasian) leading to a complex compressional environment for large earthquakes.  相似文献   

北京地区地基辐射计与卫星云特性参数对比研究          下载免费PDF全文

郭文昕  车慧正  陈权亮  肖之盛 《沙漠与绿洲气象(新疆气象)》2021,15(6):95-102

利用2019年MODIS卫星数据、葵花-8卫星数据和天空辐射计观测数据分析北京城区云光学特性的时空分布特征。结果表明,北京地区的云光学厚度(Cloud optical depth,COD)和云滴有效半径(Cloud drop effective radius,CER)呈现明显的季节变化特征。北京地区COD主要分布特征为南部地区较高而北部地区较低,且夏季COD值明显高于其他季节,最高值为20左右。CER在春季和夏季呈现相反的区域分布特征,春季北京地区南低北高,夏季北京地区南高北低,而秋冬季CER明显低于春夏两季。通过将天空辐射计观测数据与卫星观测结果对比分析发现二者在COD方面一致性较高, r分别为0.69和0.66,MODIS对于CER数据的一致性较差,r值为0.053而葵花-8一致性较好r值为0.53。  相似文献   

What happens after climate change adaptation projects end: A community-based approach to ex-post assessment of adaptation projects     

《Global Environmental Change》2023

Over the last decade, hundreds of climate change adaptation projects have been funded and implemented. Despite the importance of these first-generation adaptation projects for establishing funders and implementors’ “best practices,” very little is known about how early adaptation projects have endured, to what ends, and for whom. In this article, I propose a community-based methodology for ex-post assessment of climate change adaptation projects. This methodology contributes to recognitional justice by asking the individuals and collectives tasked with sustaining adaptation initiatives to define adaptation success and what criteria for success should be assessed. I apply this subjective assessment approach in 10 communities across Ecuador that participated in an internationally funded adaptation project that concluded in 2015. My analysis draws together participatory mapping, walking interviews with local leaders, participant observation, and surveys with former project participants. The results highlight that even adaptation projects that were deemed highly successful at their closure have uncertain futures. I find that the sustainability mechanisms that were envisioned by project implementors have not functioned, and communities are shouldering the burden of reviving failing adaptation interventions. These findings highlight that the current model of episodic funding for climate change adaptation projects and evaluation processes needs to be revisited to acknowledge the long-term challenges faced by communities. This analysis also calls attention to the importance of ex-post assessment for adaptation projects and the potential of subjective assessment approaches for building more ontological and epistemological pluralism in understandings of successful climate change adaptation.  相似文献   

金华市风能资源分析          下载免费PDF全文

章永辉  楼俊伟  张鑫  王勇 《沙漠与绿洲气象(新疆气象)》2023,17(2):98-105

为了分析金华市风能资源的丰匮及其分布状况，利用2017—2020年金华市8个国家地面气象观测站和169个区域自动气象站的逐小时风向风速资料，统计分析了平均风速、有效风速时数、有效风能密度等风资源评估参数。结果表明：按照风能资源区划标准，武义大莱站和义乌站的风能资源达到可利用区的标准，而其他站点则处在风能资源贫乏区，其中，大莱距地面10 m高度的年平均有效风能密度达107.5 W/m²，有效风速时数为5 481.0 h，年主导风向为WNW，义乌的有效风能密度则为51.5 W/m²，有效风速时数2 571.3 h，年主导风向为N；义乌平均风速的日变化幅度较大，不利于其风电在并网过程中的安全稳定。  相似文献   

d−α radiative capture reaction at the 3+ resonance     

《New Astronomy》2022

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Effective transport width——A methodology to describe the spatial variability of bedload transport     

Rolf Rindler  Sabrina Schwarz  Marcel Liedermann  Dorian Shire-Peterlechner  Andrea Kreisler  Johann Aigner  Michael Tritthart  Helmut Habersack 《国际泥沙研究》2023,38(2):294-301

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