The International Monitoring System (IMS) was established in the late 1990s for verification of the Comprehensive Nuclear-Test-Ban Treaty (CTBT). Upon completion, 60 infrasound stations distributed over the globe will monitor the Earth's atmosphere for low-frequency pressure waves. In this study, we present advanced infrasound data products of the 53 currently certified IMS infrasound stations for atmospheric studies and civilian applications. For this purpose, 18 years of raw IMS infrasound waveform data (2003–2020) were reprocessed using the Progressive Multi-Channel Correlation (PMCC) method. A one-third octave frequency band configuration between 0.01 and 4 Hz was chosen to run this array-processing algorithm which detects coherent infrasound waves within the background noise. From the comprehensive detection lists, four products were derived for each of the certified 53 IMS infrasound stations. The four products cover different frequency ranges and are provided at the following different temporal resolutions: a very low-frequency set (0.02–0.07 Hz, 30 min; https://doi.org/10.25928/bgrseis_bblf-ifsd, Hupe et al., 2021a), two so-called microbarom frequency sets – covering both the lower (0.15–0.35 Hz, 15 min; https://doi.org/10.25928/bgrseis_mblf-ifsd, Hupe et al., 2021b) and a higher (0.45–0.65 Hz, 15 min; https://doi.org/10.25928/bgrseis_mbhf-ifsd, Hupe et al., 2021c) part – named after the dominant ambient noise of interacting ocean waves that are quasi-continuously detected at IMS stations, and observations with center frequencies of 1 to 3 Hz (5 min), called the high-frequency product (https://doi.org/10.25928/bgrseis_bbhf-ifsd, Hupe et al., 2021d). Within these frequency ranges and time windows, the dominant repetitive signal directions are summarized. Along with several detection parameters, calculated quantities for assessing the relative quality of the products are provided. The validity of the data products is demonstrated through example case studies of recent events that produced infrasound detected at IMS infrasound stations and through a global assessment and summary of the products. The four infrasound data products cover globally repeating infrasound sources such as ocean ambient noise or persistently active volcanoes, which have previously been suggested as sources for probing the winds in the middle atmosphere. Therefore, our infrasound data products open up the IMS observations also to user groups who do not have unconstrained access to IMS data or who are unfamiliar with infrasound data processing using the PMCC method. These types of data products could potentially serve as a basis for volcanic eruption early warning systems in the future.

中文翻译：

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用于大气研究和民用应用的国际监测系统次声数据产品

国际监测系统（IMS）成立于 1990 年代后期，用于核查《全面禁止核试验条约》（CTBT）。建成后，分布在全球的 60 个次声台站将监测地球大气中的低频压力波。在这项研究中，我们展示了 53 个目前经过认证的 IMS 次声台站的先进次声数据产品，用于大气研究和民用应用。为此，使用渐进多通道相关 (PMCC) 方法对 18 年的原始 IMS 次声波形数据（2003-2020 年）进行了重新处理。选择 0.01 到 4 Hz 之间的三分之一倍频程频带配置来运行这种阵列处理算法，该算法检测背景噪声中的相干次声波。从综合检测列表中，经认证的 53 个 IMS 次声台站中的每一个都派生了四种产品。这四种产品涵盖不同的频率范围，并以以下不同的时间分辨率提供：极低频组（0.02-0.07 Hz，30 分钟；https://doi.org/10.25928/bgrseis_bblf-ifsd，Hupe 等人。 , 2021a), 两个所谓的微气压频率组 – 覆盖较低的 (0.15–0.35 Hz, 15 分钟; https://doi.org/10.25928/bgrseis_mblf-ifsd, Hupe et al., 2021b) 和较高的 ( 0.45–0.65 Hz，15 分钟；https://doi.org/10.25928/bgrseis_mbhf-ifsd，Hupe 等人，2021c）部分——以在 IMS 站准连续检测到的相互作用海浪的主要环境噪声命名，以及中心频率为 1 到 3 Hz（5 分钟）的观测值，称为高频乘积（https://doi.org/10.25928/bgrseis_bbhf-ifsd，Hupe 等人，2021d）。在这些频率范围和时间窗口内，总结了主要的重复信号方向。除了几个检测参数外，还提供了用于评估产品相对质量的计算量。数据产品的有效性通过对在 IMS 次声台站检测到的产生次声的最近事件的示例案例研究以及对产品的全球评估和总结得到证明。这四种次声数据产品涵盖了全球重复的次声源，例如海洋环境噪声或持续活跃的火山，以前曾建议将其作为探测中层大气风的来源。所以，我们的次声数据产品还向无法无限制地访问 IMS 数据或不熟悉使用 PMCC 方法处理次声数据的用户群体开放 IMS 观测。这些类型的数据产品有可能成为未来火山喷发预警系统的基础。