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首页> 外文期刊>Earth, planets and space: EPS >Magnitude determination using duration of high frequency energy radiation and displacement amplitude: Application to the 2011 off the pacific coast of tohoku earthquake
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Magnitude determination using duration of high frequency energy radiation and displacement amplitude: Application to the 2011 off the pacific coast of tohoku earthquake

机译：利用高频能量辐射的持续时间和位移振幅确定幅值：在2011年东北太平洋地震中的应用

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摘要

We have applied a technique to determine earthquake magnitudes, using durations of high frequency energy radiation and the maximum displacement amplitudes, to the 2011 off the Pacific coast of Tohoku Earthquake. The estimated duration of high frequency energy radiation and magnitude are 170.5 s, and 8.96, respectively. This agrees well with preliminary analyses for this earthquake. Compared with the December 26, 2004, Sumatra earthquake (M _w 9.0), this event is characterized by a shorter duration of high frequency energy radiation and a larger displacement amplitude. The measured durations of high frequency energy radiation show azimuthal dependence, which indicates rupture propagation in the southwest direction. This result, together with rupture models obtained by other studies using lower frequency seismic signals or tsunami waveforms, suggests that there were two distinct rupture propagations in this event: one in a southwest direction from which high frequency energies were radiated efficiently, and the other in an east direction from which a very large seismic moment was released. We measured the time differences between F-wave arrivals and the times at which the absolute amplitudes of high bandpass (2-4 Hz) filtered F-waves became the largest. Most of the measured time differences, normalized by twice the centroid time shift, are in the range between 50 and 80 per cent. This is consistent with the frequency distribution that we obtained previously for a set of 68 large shallow earthquakes.
机译：我们采用了一种技术，利用高频能量辐射的持续时间和最大位移振幅，确定了2011年东北东北太平洋地震的地震震级。估计的高频能量辐射持续时间和幅度分别为170.5 s和8.96。这与对该地震的初步分析非常吻合。与2004年12月26日的苏门答腊地震（M _w 9.0）相比，该事件的特点是高频能量辐射的持续时间较短，位移幅度较大。测得的高频能量辐射持续时间显示出方位角依赖性，这表明破裂向西南方向传播。该结果与其他研究使用低频地震信号或海啸波形获得的破裂模型一起表明，在此事件中存在两种截然不同的破裂传播：一个是向西南方向有效地辐射了高频能量，而另一个则是向东释放很大的地震矩。我们测量了F波到达之间的时间差以及经过高带通（2-4 Hz）滤波的F波的绝对振幅变为最大的时间。大多数测得的时差（以质心时移的两倍进行标准化）在50％到80％之间。这与我们先前针对一组68次大的浅层地震获得的频率分布一致。

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