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Correlation between local slip rate and local high-frequency seismic radiation in an earthquake fault

机译：地震断层局部滑移率与局部高频地震辐射的相关性

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摘要

For any earthquake, the slipping fault and the source of high-frequency seismic waves, by and large, coincide. On a more local scale, however, the areas of high seismic slip rate and of increased high-frequency radiation output (seismic luminosity) need not match. To study in some detail how slip rate and seismic luminosity are interrelated, a systematic study is performed that uses 251 records of teleseismic P waves from 23 intermediate-depth earthquakes of magnitude 6.8 and above. From a broadband trace we extract two time histories: (1) displacement and (2) 0.5-2.5 Hz band-passed and squared velocity, or "HF power'', and calculate correlation coefficient, rho between the two. To reduce the bias related to formation of P coda, a special procedure is applied to data. We estimated the average value rho = 0.52 (range of event averages 0.35 to 0.65) for the correlation coefficient between the radiated time histories for displacement and ``HF power'', which is considerably below the ``ideal'' value of unity. We argue that the same or even lower value characterizes the degree of slip rate - seismic luminosity correlation at the fault. Two factors may contribute to the revealed decorrelation: (1) random fluctuations of observed HF power (inevitable for a signal with a limited bandwidth), and (2) the genuine mismatch of slip rate and mean luminosity. We show that these factors, acting separately, would result in the rho values equal to, correspondingly, 0.72 and 0.80. We also show that genuine decorrelation is statistically significant. We conclude that the observed values of rho indicate genuine differences between the distributions of the slip rate and the seismic luminosity over the fault area. These results provide important constraints both for the accurate wide-band simulation of strong ground motion and for theoretical dynamic source models.
机译：对于任何地震，滑移断层和高频地震波的来源大体上是重合的。然而，在更局部的规模上，高地震滑动率和高频率高频辐射输出（地震光度）的区域不需要匹配。为了更详细地研究滑移率和地震光度之间的关系，进行了系统的研究，使用了来自23个6.8级及以上的中深度地震的251条远震P波记录。从宽带轨迹中，我们提取了两个时间历史记录：（1）位移和（2）0.5-2.5 Hz带通和平方速度或“ HF功率”，并计算两者之间的相关系数rho。与P尾气的形成有关，我们对数据进行了特殊处理。我们估计了位移的辐射时间历史与``HF功率''之间的相关系数的平均值rho = 0.52（事件平均值的范围为0.35至0.65）。 ，该值大大低于统一的“理想”值。我们认为相同或更低的值代表滑移率的程度-断层处的地震光度相关性。两个因素可能与揭示的去相关性有关：（1）观察到的高频功率的随机波动（对于带宽有限的信号而言是不可避免的），以及（2）滑移率和平均光度的真正不匹配，我们表明，这些因素分开作用，将导致rho值分别等于，0.72和0.80。 e也表明真正的去相关在统计上是重要的。我们得出的结论是，rho的观测值表明了断层区域的滑动率分布和地震光度分布之间的真正差异。这些结果为精确的强地面运动的宽带模拟和理论动态源模型提供了重要的约束。

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