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141.
野外考察结果表明,1927年古浪8级大地震造成了6段不同规模、不同方向、不同力学成因、不同等级的地表破裂,构成了呈面状分布的复杂地震破裂带,与我国西部地区由走滑断层运动形成的破裂带相比具有较大差异。其中的4段破裂与极震区及余震分布的位置相重合,主体散布在冬青顶北麓一带,沿皇城-双塔活动断裂的东段和武威-天祝活动断裂北段分布,是1927年古浪地震的主破裂带。其余两段分别分布在Ⅸ度区内的皇城-双塔断裂中段和西山堡-滴水崖断裂带上,是高烈度区内的次级破裂。4段主破裂是在统一构造应力场作用下形成的产物,具有统一变形机制。其中冬青顶张性破裂带是发育在山前下方寨-严家新庄逆断层上盘的次级张性破裂,而主破裂是由逆断层运动在寺儿沟滩等处的山前洪积台地上产生的 相似文献
142.
三维地震数据的同一共中心点道集是由不同方位角的地震道组成的。当地下地层倾斜时,共中心点道集的反射同相轴就存在方位角时差。本文根据方位角时差校正(AMO)的基本原理,从f-k域的正、逆DMO出发,通过稳相法得到积分法AMO脉冲响应的时间、振幅因子公式。把AMO应用于一束实际三维地震数据处理,经AMO处理后的剖面绕射波和断面反射波得到了加强,其效果是令人满意的。 相似文献
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Hou Baorong 《中国海洋湖沼学报》1986,4(3):293-303
Corrosion of marine steel constructions may vary to a considerable extent owing to their different locations such as atmosphere,
splash zone, tidal zone, immersion zone and mud zone[7, 8]. A rather lengthy hanging steel sample is needed to test its corrosion resistance in various environments. But it is cumbersome
to handle and not convenient for frequent observation and maintenance. So an indoor analogue test method is generally adopted
for this purpose[1]. This paper is a report of such a test.
Contribution No. 1333 from the Institute of Oceanology, Academia Sinica. 相似文献
146.
The thermal condition anomaly of the western Pacific warm pool and its zonal displacement have very important influences on climate change in East Asia and even the whole world. However, the impact of the zonal wind anomaly over the Pacific Ocean on zonal displacement of the warm pool has not yet been analyzed based on long-term record. Therefore, it is important to study the zonal displacement of the warm pool and its response to the zonal wind anomaly over the equatorial Pacific Ocean. Based on the NCDC monthly averaged SST (sea surface temperature) data in 2°×2° grid in the Pacific Ocean from 1950 to 2000, and the NCEP/NCAR global monthly averaged 850 hPa zonal wind data from 1949 to 2000, the relationships between zonal displacements of the western Pacific warm pool and zonal wind anomalies over the tropical Pacific Ocean are analyzed in this paper. The results show that the zonal displacements are closely related to the zonal wind anomalies over the western, central and eastern equatorial Pacific Ocean. Composite analysis indicates that during ENSO events, the warm pool displacement was trigged by the zonal wind anomalies over the western equatorial Pacific Ocean in early stage and the process proceeded under the zonal wind anomalies over the central and eastern equatorial Pacific Ocean unless the wind direction changes. Therefore, in addition to the zonal wind anomaly over the western Pacific, the zonal wind anomalies over the central and eastern Pacific Ocean should be considered also in investigation the dynamical mechanisms of the zonal displacement of the warm pool. 相似文献
147.
Observed typhoon wave spectrum in northern South China Sea 总被引:1,自引:0,他引:1
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To improve the accuracy of short-term(0–12 h) forecasts of severe weather in southern China, a real-time storm-scale forecasting system, the Hourly Assimilation and Prediction System(HAPS), has been implemented in Shenzhen, China. The forecasting system is characterized by combining the Advanced Research Weather Research and Forecasting(WRF-ARW)model and the Advanced Regional Prediction System(ARPS) three-dimensional variational data assimilation(3DVAR) package. It is capable of assimilating radar reflectivity and radial velocity data from multiple Doppler radars as well as surface automatic weather station(AWS) data. Experiments are designed to evaluate the impacts of data assimilation on quantitative precipitation forecasting(QPF) by studying a heavy rainfall event in southern China. The forecasts from these experiments are verified against radar, surface, and precipitation observations. Comparison of echo structure and accumulated precipitation suggests that radar data assimilation is useful in improving the short-term forecast by capturing the location and orientation of the band of accumulated rainfall. The assimilation of radar data improves the short-term precipitation forecast skill by up to9 hours by producing more convection. The slight but generally positive impact that surface AWS data has on the forecast of near-surface variables can last up to 6–9 hours. The assimilation of AWS observations alone has some benefit for improving the Fractions Skill Score(FSS) and bias scores; when radar data are assimilated, the additional AWS data may increase the degree of rainfall overprediction. 相似文献