论文标题
风的相干性低引起的地震噪声：对重力波检测的影响
Low coherency of wind induced seismic noise: Implications for gravitational wave detection
论文作者
论文摘要
地震噪声对重力波检测构成挑战。有效的振动隔离和减去无法说的牛顿噪声的方法就是例子。地震阵列提供了一种假设地震相干性的方法来处理这些问题。在本文中，我们发现风诱导的地震噪声是不连贯的，并且会大大降低未来重力波探测器的预计低频灵敏度。为了量化这一点，我们在三个不同的位置中测量了风引起的地震噪声的连贯性长度：靠近建筑物，高大的树木和灌木丛中的地震噪声。我们表明，风诱导的地震噪声无处不在，并将连贯性长度降低至2--40〜m，从0.06---0.1〜Hz开始，从$> $> $> $> $> $> $> $> $> $> $> $> $> 3--16〜m for 1.5---2.5〜Hz，从$> $> $> $> $> $ 35〜m到1--1--16〜M到1--1--1--1--1--1--1--1--1--1--1-16.6 Hz HZ频率频率频率频率频率频率频率。这会导致阵列在原发性微作用中的速度和角度分辨率的显着损失，而牛顿噪声通过2〜Hz的过滤来消除了牛顿噪声的5倍，而在10-20〜Hz之间，牛顿噪声消除的挑战并没有带来额外的挑战。
Seismic noise poses challenges for gravitational wave detection. Effective vibration isolation and methods to subtract unsheildable Newtonian Noise are examples. Seismic arrays offer one way to deal with these issues assuming seismic coherency. In this paper we find that wind induced seismic noise is incoherent and will dramatically reduce the projected low frequency sensitivity of future gravitational wave detectors. To quantify this, we measure the coherence length of wind induced seismic noise from 0.06--20~Hz in three distinct locations: close to a building, among tall trees and in shrubs. We show that wind induced seismic noise is ubiquitous and reduces the coherence lengths form several hundred meters to 2--40~m for 0.06--0.1~Hz, from $>$60~m to 3--16~m for 1.5--2.5~Hz and from $>$35~m to 1--16~m around 16.6 Hz frequency bands in the study area. This leads to significant loss of velocity and angular resolution of the array for primary microseism, 5 times worse Newtonian Noise cancellation by wiener filtering at 2~Hz, while it does not pose additional challenge for Newtonian Noise cancellation between 10--20~Hz.
