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Fracture-fissure systems found at mid-ocean ridges are dominating conduits for the circulation of metallogenic fluid. Ascertaining the distribution area of active faults on both sides of mid-ocean ridges will provide a useful tool in the search for potential hydrothermal vents, thus guiding the exploration of modern seafloor sulfides. Considering the Mid-Atlantic Ridge 20°N–24°N (NMAR) and North Chile Rise (NCR) as examples, fault elements such as Fault Spacing (?S) and Fault Heave (?X) can be identified and quantitatively measured. The methods used include Fourier filtering of the multi-beam bathymetry data, in combination with measurements of the topographic slope, curvature, and slope aspect patterns. According to the Sequential Faulting Model of mid-ocean ridges, the maximal migration distance of an active fault on either side of mid-ocean ridges—that is, the distribution range of active faults—can be measured. Results show that the maximal migration distance of active faults at the NMAR is 0.76–1.01 km (the distance is larger at the center than at the ends of this segment), and at the NCR, the distribution range of active faults is 0.38–1.6 km. The migration distance of active faults on the two study areas is positively related to the axial variation of magma supply. In the NCR study area, where there is an abundant magma input, the number of faults within a certain distance is mainly affected by the variation of lithospheric thickness. Here a large range of faulting clearly corresponds to a high proportion of magmatism to seafloor spreading near mid-ocean ridges (M) value, and in the study area of the NMAR, there is insufficient magmatism, and the number of faults may be controlled by both lithospheric thickness and magma supply, leading to a less obvious positive correlation between the distribution range of active faults and M. 相似文献
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Mai Miyamoto Masashi Kiyota Hiroto Murase Takeshi Nakamura Takeshi Hayashibara 《Marine Geodesy》2017,40(4):205-223
We investigated the effects of the spatial resolution of bathymetry data on the predicted local distribution of large gorgonian corals on the southern Emperor Seamounts in the high seas of North Pacific. Terrain attributes were calculated from bathymetric survey data at six different grid-cell sizes (25–800 m) to investigate how the values of bottom terrain attributes and the prediction of MaxEnt habitat suitability models would vary with grid-cell size. The values of each terrain attribute showed different patterns among different grid-cell sizes, and MaxEnt demonstrated better performance at grid-cell size of 100 m or less than at larger sizes. 相似文献
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利用Bayes估计进行多波束测深异常数据探测 总被引：1，自引：1，他引：0
在海底地形变化连续、平缓的假设条件下,基于Bayes估计理论提出了多波束测深异常数据探测方法,并与选权迭代加权平均滤波法进行了分析和比较。结果证明,该方法可以解决测深异常值判断标准可靠性的问题,而且能合理、有效地探测出异常值。 相似文献
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《Chinese Astronomy and Astrophysics》2020,44(3):383-398
The Superconducting Superconductor-Insulator-Superconductor (SIS) receivers have become the preferred method for (sub)millimeter-wave radio astronomical observations due to the extremely low receiver noise temperature. The coupling noise of the local oscillator (LO) system is also a part of the receiver noise. In many years of astronomical observations, it is found that the LO-coupled noise cannot be completely ignored, which has a certain impact on the sensitivity of astronomical observations. The noise temperature of the superconducting SIS receiver was tested using two different kinds of signal generators as the primary signal source of the LO system. It is found that the base noise output by the signal generator can be coupled into the receiver to increase the receiver noise. By adding a narrow band filter to the output of the signal generator, the base noise of the signal generator can be filtered out, and this part noise of the receiver can be eliminated, the overall noise of the receiver is reduced, and the sensitivity of the telescope is improved. 相似文献
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声速误差是多波束水深地形测量主要误差源之一,通常采用现场声速剖面测量的方式加以改正,但在深远海多波束水深地形测量时,现场获取全深度的声速剖面并非易事。针对这一问题,利用东南印度洋海洋调查工作中采集到的17个站位的CTD数据,将所有站位声速剖面拓展到全深度,采用经验正交函数分析法(Empirical Orthogonal Functions,EOF)构建调查区声速剖面场,可获得声速剖面场内任意一点的声速值。然后通过EOF重构声速剖面场获得的声速值对测区内多波束水深地形数据进行改正,并与实测声速剖面对多波束水深地形数据的改正结果进行对比,结果表明,5000 m水深范围内2种声速改正结果相差很小,EOF重构法对深水多波束的声速改正满足水深测量的要求。 相似文献
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