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Similar scaling laws for earthquakes and Cascadia slow-slip events

机译：地震和卡斯卡迪亚慢滑事件的类似缩放定律

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摘要

Faults can slip not only episodically during earthquakes but also during transient aseismic slip events(1-5), often called slow-slip events. Previous studies based on observations compiled from various tectonic settings(6-8) have suggested that the moment of slow-slip events is proportional to their duration, instead of following the duration-cubed scaling found for earthquakes(9). This finding has spurred efforts to unravel the cause of the difference in scaling(6,10-14). Thanks to a new catalogue of slow-slip events on the Cascadia megathrust based on the inversion of surface deformation measurements between 2007 and 2017(15), we find that a cubic moment-duration scaling law is more likely. Like regular earthquakes, slow-slip events also have a moment that is proportional to A(3/2), where A is the rupture area, and obey the Gutenberg-Richter relationship between frequency and magnitude. Finally, these slow-slip events show pulse-like ruptures similar to seismic ruptures. The scaling properties of slow-slip events are thus strikingly similar to those of regular earthquakes, suggesting that they are governed by similar dynamic properties.
机译：断层不仅可以在地震过程中突然滑脱，还可以在瞬态抗震滑移事件中（1-5）发生，通常被称为慢滑事件。以往基于各种构造背景的观测资料的研究（6-8）表明，慢滑事件的时刻与其持续时间成正比，而不是遵循地震发现的持续时间成倍尺度（9）。这一发现促使人们努力揭示结垢差异的原因（6,10-14）。多亏了2007年至2017年间基于表面变形测量值反演的卡斯卡迪亚超大推力上的慢滑事件新目录（15），我们发现立方矩持续时间的比例定律更有可能。像常规地震一样，慢滑事件的矩也与A（3/2）成比例，其中A是破裂区域，并且服从频率与幅度之间的古登堡-里希特关系。最后，这些缓慢滑动事件显示出类似于地震破裂的脉冲状破裂。因此，慢滑事件的标度性质与常规地震的标度性质极为相似，表明它们受相似的动态性质支配。

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  • 来源
    《Nature》 |2019年第7779期|522-526|共5页
  • 作者

    Michel Sylvain; Gualandi Adriano; Avouac Jean-Philippe;

  • 作者单位

    CALTECH Dept Geol & Planetary Sci Pasadena CA 91125 USA|Univ Cambridge Dept Earth Sci Bullard Labs Cambridge England|Ecole Normale Super Geol Lab Paris France;

    CALTECH Dept Geol & Planetary Sci Pasadena CA 91125 USA|CALTECH Jet Prop Lab Pasadena CA 91125 USA;

    CALTECH Dept Geol & Planetary Sci Pasadena CA 91125 USA|Ecole Polytech Palaiseau France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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