AN AUTOMATIC EVENT DETECTOR AT THE TONTO FOREST SEISMIC OBSERVATORY
AN AUTOMATIC EVENT DETECTOR AT THE TONTO FOREST SEISMIC OBSERVATORY
复制标题
通托森林地震台的自动事件探测器
DOI：
10.1190/1.1440453
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发表时间：
1974
期刊：
影响因子：
3.3
通讯作者：
R. Blandford
中科院分区：
文献类型：
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作者：
R. Blandford
在托托森林观测站的短周期地震台阵上，对自动事件探测器的在线运行进行了评估。对于31台地震仪和1个固定阈值，千岛岛梁上以Δ=70度为中心的90%增量检测阈值为mb=4.15±0.05，实验确定的虚警率为每天0.17。这与人工操作员的能力相比是有利的。千岛群岛的风暴显著影响了F统计探测轨迹的幅度分布，我们估计，在运行阈值下观察到的大多数错误警报可以追溯到由风暴产生的能量引入的统计偏差。如果调整阈值以保持恒定的虚警率，则对阈值震级的最大影响将为0.05mb。
The on‐line operation of an automatic event detector has been evaluated at the Tonto Forest Observatory short‐period seismic array. For 31 seismometers and one fixed threshold, the 90 percent incremental detection threshold on the Kuril Island beam, centered at Δ=70 degrees, is mb=4.15±.05 with an experimentally determined false alarm rate of 0.17 per day. This compares favorably with the capabilities of a human operator. Storms in the Kurils significantly affect the distribution of amplitudes of the F-statistic detection trace, and we estimate that most of the false alarms observed at the operating threshold can be traced to the statistical bias introduced by this storm‐generated energy. If the threshold were adjusted to maintain a constant false alarm rate, the maximum effect on the threshold magnitude would be 0.05mb.