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首页> 外文期刊>Physics of the Earth and Planetary Interiors: A Journal Devoted to Obsevational and Experimerntal Studies of the Chemistry and Physics of Planetary Interiors and Their Theoretical Interpretation >On the reported magnetic precursor of the 1989 Loma Prieta earthquake
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On the reported magnetic precursor of the 1989 Loma Prieta earthquake

机译：关于据报道的1989年Loma Prieta地震的磁性前兆

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Among the most frequently cited reports in the science of earthquake prediction is that by Fraser-Smith et at. (1990) and Bernardi et a]. (1991). They found anomalous enhancement of magnetic-field noise levels prior to the 18 October 1989 Loma Prieta earthquake in the ultra-low-frequency range (0.0110-10.001 Hz) from a ground-based sensor at Corralitos, CA, just 7 km from the earthquake epicenter. In this analysis, we re-examine all of the available Corralitos data (21 months from January 1989 to October 1990) and the logbook kept during this extended operational period. We also examine 1.0-Hz (1-s) data collected from Japan, 0.0167-Hz (1-min) data collected from the Fresno, CA magnetic observatory, and the global Kp magnetic-activity index. The Japanese data are of particular importance since their acquisition rate is sufficient to allow direct comparison with the lower-frequency bands of the Corralitos data. We identify numerous problems in the Corralitos data, evident from both straightforward examination of the Corralitos data on their own and by comparison with the Japanese and Fresno data sets. The most notable problems are changes in the baseline noise levels occurring during both the reported precursory period and at other times long before and after the earthquake. We conclude that the reported anomalous magnetic noise identified by Fraser-Smith et al. and Bernardi et al. is not related to the Loma Prieta earthquake but is an artifact of sensor-system malfunction.
机译：Fraser-Smith等人在地震预测科学中引用最多的报道之一。 （1990）和Bernardi等[a]。 （1991）。他们发现，在距地震仅7公里的加利福尼亚州科拉里托斯市的地面传感器发出的超低频范围（0.0110-10.001 Hz）的超低频范围（0.0110-10.001 Hz）地震之前，磁场噪声水平异常增强。震中。在此分析中，我们重新检查了所有可用的Corralitos数据（从1989年1月到1990年10月为21个月），并在此扩展的操作期内保留了日志。我们还检查了从日本收集的1.0 Hz（1-s）数据，从加利福尼亚州的弗雷斯诺磁观测站收集的0.0167 Hz（1 min）数据以及全球Kp磁活度指数。日本数据特别重要，因为它们的采集速率足以与Corralitos数据的较低频段进行直接比较。我们在Corralitos数据中发现了许多问题，从对Corralitos数据本身的直接检查以及与日语和Fresno数据集的比较中可以明显看出。最明显的问题是在报告的前期期间以及地震前后很长的其他时间发生的基线噪声水平的变化。我们得出的结论是，由Fraser-Smith等人确定的报告的异常磁噪声。和Bernardi等。与Loma Prieta地震无关，而是传感器系统故障的产物。

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