Broad-band ocean bottom seismometer noise properties
Broad-band ocean bottom seismometer noise properties
复制标题
宽带海底地震仪噪声特性
DOI：
10.1093/gji/ggac450
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发表时间：
2022
影响因子：
2.8
通讯作者：
Coats, S.
中科院分区：
文献类型：
--
作者：
Janiszewski, Helen A.;Eilon, Z.;Russell, J. B.;Brunsvik, B.;Gaherty, J. B.;Mosher, S. G.;Hawley, W. B.;Coats, S.
我们提出了一个新的汇编和分析的宽带海底地震计噪声特性从15年的地震部署。我们编制了一个全面的数据集的代表性四分量（地震计和压力计）噪声谱和交叉谱特性（相干性，相位和导纳）的551个独特的站跨越18个美国- LED实验与此相匹配的是与每个台站的仪器和环境特性有关的元数据参数的全面汇编。我们系统地调查的相似性噪声频谱进行分组，根据这些元数据参数，以确定哪些因素是最重要的，在确定噪声特性。我们发现证据的噪声特性的相似性的改进时，分组参数，与地震检波器类型和部署水深产生最显着的和可解释的结果分组。仪器设计，即整个部署的软件包，也起着重要的作用，尽管它与地震仪和水深密切相关。我们评估了传统的倾斜源，顺应性和微震噪声的存在，以表征它们在各种常用地震频带中的相对作用。我们发现倾斜噪声的存在主要取决于所使用的地震计类型（与仪器设计的特定子集协变），合规性噪声遵循与水深的预期关系，并且浅海陆棚环境具有系统性不同的微震噪声属性（这反过来又与部署在浅湖环境中的仪器不同）。这些观测结果对常用地震分析技术的可行性具有重要意义。最后，我们比较了垂直通道倾斜和顺应性噪声去除前后的频谱和相干性，以评估这些标准处理技术的有效性和局限性。这些发现可能有助于未来的实验规划和仪器开发，我们新编制的噪声数据集可作为海洋地震学界未来更有针对性的调查的基础。
We present a new compilation and analysis of broad-band ocean bottom seismometer noise properties from 15 yr of seismic deployments. We compile a comprehensive data set of representative four-component (seismometer and pressure gauge) noise spectra and cross-spectral properties (coherence, phase and admittance) for 551 unique stations spanning 18 U.S.-led experiments. This is matched with a comprehensive compilation of metadata parameters related to instrumentation and environmental properties for each station. We systematically investigate the similarity of noise spectra by grouping them according to these metadata parameters to determine which factors are the most important in determining noise characteristics. We find evidence for improvements in similarity of noise properties when grouped across parameters, with groupings by seismometer type and deployment water depth yielding the most significant and interpretable results. Instrument design, that is the entire deployed package, also plays an important role, although it strongly covaries with seismometer and water depth. We assess the presence of traditional sources of tilt, compliance, and microseismic noise to characterize their relative role across a variety of commonly used seismic frequency bands. We find that the presence of tilt noise is primarily dependent on the type of seismometer used (covariant with a particular subset of instrument design), that compliance noise follows anticipated relationships with water depth, and that shallow, oceanic shelf environments have systematically different microseism noise properties (which are, in turn, different from instruments deployed in shallow lake environments). These observations have important implications for the viability of commonly used seismic analysis techniques. Finally, we compare spectra and coherences before and after vertical channel tilt and compliance noise removal to evaluate the efficacy and limitations of these now standard processing techniques. These findings may assist in future experiment planning and instrument development, and our newly compiled noise data set serves as a building block for more targeted future investigations by the marine seismology community.