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四川地区应力应变和重力的地震短临前兆异常特征 总被引:3,自引:0,他引:3
对多年来四川地区的应力应变及重力观测资料的短临前兆异常进行了系统的整理和研究,整理出各台项在多次中等以上地震前的异常特征,并对其中一些异常的物理机制进行了研究.短期异常特征如下:攀枝花仁和台应变曲线表现为"N"形异常,西昌小庙台应变曲线为单点突跳与固体潮畸变.临震异常特征包括:攀枝花仁和台与西昌小庙台应变曲线的阶跃及"应变波",攀枝花仁和台钻孔水位的"前驱波".结合相关物理理论论证了西昌小庙台应变在2001年雅江6.0 级地震前异常的阶段性及异常从中期向短期过渡的特征.另外,通过数学方法处理得到了攀枝花南山台重力异常从中期向短期过渡的标志. 相似文献
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结合地震波记录原理,分析并讨论攀枝花台数字仪震相的一些物理特征,并使用MATLAB对攀枝花、长春台的地震资料做简单滤波分析,便于真实地反映地震波震相。参考川滇交界地区地质构造,总结出攀枝花台对多次地震记录震相分析的经验规律,为地震速报快速识别震相提供实用参考。 相似文献
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攀枝花古地幔柱的形成与演化对这一地域的大地构造格局、金属矿产的聚集和区域大陆动力学研究均有着极为重要的科学意义和应用价值.本文通过穿越攀枝花古地幔柱中心部位的四条人工源深部地震探测剖面和区域地球物理边界场响应研究提出:(1)攀枝花古地幔柱具有特异的壳、幔速度结构;(2)在其中心部位由结晶基底到壳、幔边界均为高速体,且结晶基底和Moho界面局部隆起、地壳内部存在厚达10余千米的低速层,且被数条深、大断裂切割;(3)重力场、磁力场的边界异常场响应组构了攀枝花古地幔柱的地表形态和中心部位的圈闭范围. 相似文献
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攀枝花钻孔应力-应变异常与昆仑山口西8.1级地震 总被引:1,自引:0,他引:1
攀枝花基准台距离2001年11月14日的昆仑山口西8.1级地震震中1312千米。虽然与震中遥隔千里,穿越复杂构造,但攀枝花台的钻孔应力-应变观测仍监测到了明显的中短期和临震异常。 相似文献
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攀枝花数字地震台网是一个采用全无线传输方式的地方台网。唯一可资利用的大黑山中继站电磁干扰强烈和部分子台传输路径条件差是该台网设计建设中最大的技术难点。避、滤、纠是在攀枝花台网设计建设中采取的三大应对措施,要点是避开密集而强烈的干扰、在接收机中用多种方法滤除干扰、应用具有高编码增益的前向差错控制技术纠正已出现的误码。通过避、滤、纠使地震波形数据的高质量无线传输在攀枝花特有的恶劣环境中得以实现。 相似文献
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王翠芳 《地震地磁观测与研究》2003,24(5):112-115
引言 攀枝花地区被多个强震潜在震源区围限,是四川省地震多发区之一。为了快速准确地测定攀枝花及邻区可能发生的地震,在市政府的支持下,攀枝花数字遥测地震台网已经投入建设。 众所周知,一个地震台网的建成分为总体设计、野外勘选和安装调试3个阶段。其中野外勘选阶段又分为台基测试和无线信道测试(不包括有线传输)。无线信道测试的主要目的是摸清信道的主要状况,包括增益储备、路由中的阻挡情况,传输方向以及雷电袭击等情况,这将为今后设备选型和工作频段的选择提供强有力的设计依据。在信道测试中主要用信道误码来表征信道的主要状况。具… 相似文献
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以震前会商记录和震情跟踪研讨资料为主,回顾了2008年8月30日攀枝花仁和—凉山州会理间6.1级地震前的短期异常和跟踪预测情况.结果表明:2008年8月30日仁和—会理6.1级地震前川滇交界的布拖、普格、宁南一带存在小震群活动异常;理塘至川滇交界的西昌和攀枝花一带存在地下流体、形变及电磁等多项短期前兆异常;有的防震减灾部门在震前提出了短期分析预测意见. 相似文献
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利用高温高压多功能三轴实验装置对四川省攀枝花辉长岩进行了部分熔融实验研究, 实验的围压为450~500MPa, 温度区间为900~1200℃. 实验产物的透射电镜研究表明, 辉长岩部分熔融的初始熔体主要分布在不同矿物的颗粒边界和三联点, 熔体存在明显的不混溶的现象, 两相熔体的成分亦具有明显差异, 基质相富Si, Al, K,贫Mg, Fe, Ca, Na, Ti, 而球体相则恰好相反. 辉长岩的部分熔融产生的熔体各相的自由能值计算表明, 本区辉长岩岩浆不混溶是有其热力学内在原因的, 不混溶作用符合熔体体系向自由能降低方向发展的要求. 野外观察亦证明攀枝花钒钛磁铁矿的含矿岩浆发生过岩浆不混溶作用.为攀枝花钒钛磁铁矿的成矿机制提供了实验依据. 相似文献
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A. V. Kiryukhin N. P. Asaulova O. B. Vereina A. Yu. Polyakov 《Journal of Volcanology and Seismology》2014,8(3):156-167
It is shown that the productive reservoir received considerable quantities of meteoric water during the operation of the Pauzhetka geothermal field (1960–2007), which amounted to 30% of the total with-drawal of heat carrier. This led to cooling of the productive reservoir and reduced steam extraction. Modeling the operation process with the infiltration zones sealed shows that steam extraction can be enhanced by 23.2%. Multi-option modeling for the operation of the Dachnyi site of the Mutnovskii geothermal field shows that the most-likely scenario is infiltration of meteoric water with a discharge of about 60 kg/s into the productive reservoir from above. These results are consistent with the decrease in the steam concentration during the first 4 years of operation. 相似文献
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Saritha Padiyedath Gopalan Naota Hanasaki Adisorn Champathong Taichi Tebakari 《水文研究》2021,35(1):e14005
Climate change adaptation has become the current focus of research due to the remarkable potential of climate change to alter the spatial and temporal distribution of global water availability. Although reservoir operation is a potential adaptation option, earlier studies explicitly demonstrated only its historical quantitative effects. Therefore, this article evaluated the possibility of reservoir operation from an adaptation viewpoint for regulating the future flow using the H08 global hydrological model with the Chao Phraya River basin as a case study. This basin is the largest river system in Thailand and has often been affected by extreme weather challenges in the past. Future climate scenarios were constructed from the bias-corrected outputs of three general circulation models from 2080 to 2099 under RCP4.5 and RCP8.5. The important conclusions that can be drawn from this study are as follows: (i) the operation of existing and hypothetical (i.e., construction under planning) reservoirs cannot reduce the future high flows below the channel carrying capacity, although it can increase low flows in the basin. This indicates that changes in the magnitude of future high flow due to climate change are likely to be larger than those achieved by reservoir operation and there is a need for other adaptation options. (ii) A combination of reservoir operation and afforestation was considered as an adaptation strategy, but the magnitude of the discharge reduction in the wet season was still smaller than the increase caused by warming. This further signifies the necessity of combining other structural, as well as non-structural, measures. Overall, this adaptation approach for assessing the effect of reservoir operation in reducing the climate change impacts using H08 model can be applied not only in the study area but also in other places where climate change signals are robust. 相似文献
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As the largest hydroelectric dam in the world, the Three Gorges Dam (TGD) has raised wide concerns over the environmental and ecological impacts since its dramatic effect on the downstream flow regime of the Yangtze River. Since 2003, the TGD has progressed from the initial operation period to the full operation period, with different effects on the downstream flow regime over each period. Although the upstream inflow change (USIC) of the TGD is a possibly additional factor affecting the downstream flow regime, this has drawn little attention. This study aims to quantify the individual contributions of the TGD and the USIC to the changes of the downstream flow regime over different operation periods of the dam. Using the Muskingum routing model and the Xin'anjiang rainfall–run‐off model, we reconstruct the discharge unregulated by the TGD for the post‐TGD period from 2003 to 2015. On this basis, the effects of the TGD and the USIC on the downstream flow regime are quantitatively assessed. Benchmarked against the flow regime during the pre‐TGD period from 1955 to 2002, it is found that the TGD and the USIC play considerable and comparable roles in affecting the downstream flow regime during the whole post‐TGD period from 2003 to 2015. Furthermore, the TGD appears to have a limited effect on the downstream flow regime during the initial operation period from 2003 to 2008 relative to the USIC. In contrast, during the full operation period from 2009 to 2015, the TGD plays a dominant role in changing the downstream flow regime, although the effect of the USIC cannot be neglected. The findings of this study are helpful to understand the exact impacts of the TGD on the downstream flow regime, thereby facilitating the development of a rational strategy for operating the dam. 相似文献
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Multi-tier interactive genetic algorithms for the optimization of long-term reservoir operation 总被引:1,自引:0,他引:1
Genetic algorithms (GAs) are well known optimization methods. However, complicated systems with high dimensional variables, such as long-term reservoir operation, usually prevent the methods from reaching optimal solutions. This study proposes a multi-tier interactive genetic algorithm (MIGA) which decomposes a complicated system (long series) into several small-scale sub-systems (sub-series) with GA applied to each sub-system and the multi-tier (key) information mutually interacts among individual sub-systems to find the optimal solution of long-term reservoir operation. To retain the integrity of the original system, over the multi-tier architecture, an operation strategy is designed to concatenate the primary tier and the allocation tiers by providing key information from the primary tier to the allocation tiers when initializing populations in each sub-system. The Shihmen Reservoir in Taiwan is used as a case study. For comparison, three long-term operation results of a sole GA search and a simulation based on the reservoir rule curves are compared with that of MIGA. The results demonstrate that MIGA is far more efficient than the sole GA and can successfully and efficiently increase the possibility of achieving an optimal solution. The improvement rate of fitness values increases more than 25%, and the computation time dramatically decreases 80% in a 20-year long-term operation case. The MIGA with the flexibility of decomposition strategies proposed in this study can be effectively and suitably used in long-term reservoir operation or systems with similar conditions. 相似文献
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随着黑龙江省地震设备运维管理系统的应用,实现对区域内监测设备的智能管理,运维效率提高。针对智能手机使用率越来越高的特点,为了进一步提高工作效率,基于HTML5+CSS3+jQuery Mobile软件技术,开发移动端设备管理系统,使用户可以同时使用移动端与PC端,通过Web浏览器操作服务器,为工作人员提供便捷、快速的设备监测管理服务,进一步提高地震台站设备运维效率。 相似文献
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地震超快速报系统能够在地震发生后几秒至几十秒内自动确定地震三要素。2018年12月在自贡数字遥测地震台网中心部署该系统进行试运行。在2019年1月—2020年1月试运行期间,显示了该系统产出的时效性,产出的平均用时,实现了秒级产出。定位误差均在测震台网要求范围内,通过短信方式将信息传递出去,大大提升了自贡市的应急响应能力。 相似文献
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Summary The spectral content of an operation which may be called the operation of selecting the step for treating a certain, discretely expressed datum, continuous by nature is shown. 相似文献