Observing and Modeling the Spectrum of a Slow Slip Event

Observing and Modeling the Spectrum of a Slow Slip Event
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慢滑移事件的频谱观测和建模

DOI:
10.1029/2017jb015124
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发表时间:
2018
期刊:
影响因子:
3.4
通讯作者:
Hawthorne J
Hawthorne J
中科院分区:
地球科学2区
文献类型:
--
作者:
Hawthorne J

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我们估计和建模的归一化矩率功率谱的大慢滑事件在卡斯卡迪亚。我们使用来自GPS导出的滑动反演、钻孔应变记录和基于波束形成的震颤幅度的数据来估计频谱。归一化功率谱最初随频率降低,但随后在1至10天的周期内变平,然后在较高频率下衰减为频率,其中当从震颤估计时,m在1.1至1.4之间,当从应变估计时,m在0.4至1.5之间。我们探索了一种理解观测到的光谱的方法:通过将一个月的慢滑事件建模为稳定的背景矩速率和子事件的总和。这些子事件代表了观测到的各种各样的慢地震,从0.5秒长的震颤到3小时长的快速震颤逆转。我们参数化的子事件的震级分布和时刻持续时间缩放,我们研究子事件人口如何决定慢滑谱。有没有足够的数据来严格测试的子事件模型,但我们表明,数据是一致的一个单一的连续的慢地震的时刻尺度与他们的持续时间呈线性关系,如前所述。
We estimate and model the normalized moment rate power spectrum of large slow slip events in Cascadia. We estimate the spectrum using data from GPS‐derived slip inversions, borehole strain records, and beamforming‐based tremor amplitudes. The normalized power spectrum initially decreases with frequency but then may flatten at periods of 1 to 10 days before decaying as frequency at higher frequencies, wherenmis between 1.1 and 1.4 when estimated from tremor and between 0.4 and 1.5 when estimated from strain. We explore one way to understand the observed spectrum: by modeling a month‐long slow slip event as the sum of a steady background moment rate and a population of subevents. The subevents represent the wide variety of observed slow earthquakes, ranging from 0.5‐s‐long tremor to 3‐hr‐long rapid tremor reversals. We parameterize the subevents' magnitude distribution and moment‐duration scaling, and we examine how the subevent population determines the slow slip spectrum. There are not enough data to rigorously test the subevent model, but we show that the data are consistent with a single continuum of slow earthquakes whose moments scale linearly with their duration, as has been proposed previously.
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