CTBT infrasound network performance to detect the 2013 Russian fireball event
CTBT infrasound network performance to detect the 2013 Russian fireball event
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DOI：
10.1002/2015gl063482
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发表时间：
2015-04
影响因子：
5.2
通讯作者：
C. Pilger;L. Ceranna;J. Ross;A. Le Pichon;P. Mialle;M. Garcés
中科院分区：
文献类型：
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作者：
C. Pilger;L. Ceranna;J. Ross;A. Le Pichon;P. Mialle;M. Garcés
2013年车里雅宾斯克陨石的爆炸碎片产生了一个相当于500千吨TNT当量的大空爆。这是全面禁止核试验条约国际监测系统（CTBT-IMS）次声部分记录的最具活力的事件，全球42个运行站中有20个检测到。本研究使用车里雅宾斯克陨石作为全球参考事件，对IMS探测能力进行逐站估计，以解释从短距离到长距离的次声探测和未探测。调查参数影响的检测能力是线源信号的方向性，管道的声能，和个人的噪音条件在每个站。调查结果包括一个明确的检测偏好站垂直于陨石轨迹，即使在很大的距离。在这种低频情况下，只观察到平流层管道的微弱影响。此外，在每个站的背景噪声水平的昼夜变化的强烈依赖，有利于夜间检测。
The explosive fragmentation of the 2013 Chelyabinsk meteorite generated a large airburst with an equivalent yield of 500 kT TNT. It is the most energetic event recorded by the infrasound component of the Comprehensive Nuclear‐Test‐Ban Treaty‐International Monitoring System (CTBT‐IMS), globally detected by 20 out of 42 operational stations. This study performs a station‐by‐station estimation of the IMS detection capability to explain infrasound detections and nondetections from short to long distances, using the Chelyabinsk meteorite as global reference event. Investigated parameters influencing the detection capability are the directivity of the line source signal, the ducting of acoustic energy, and the individual noise conditions at each station. Findings include a clear detection preference for stations perpendicular to the meteorite trajectory, even over large distances. Only a weak influence of stratospheric ducting is observed for this low‐frequency case. Furthermore, a strong dependence on the diurnal variability of background noise levels at each station is observed, favoring nocturnal detections.