低频地震捕捉到的次级慢断层滑动动力学

IF 8.3 Q1 GEOSCIENCES, MULTIDISCIPLINARY
AGU Advances Pub Date : 2023-06-28 DOI:10.1029/2022AV000848
Caroline Mouchon, William B. Frank, Mathilde Radiguet, Piero Poli, Nathalie Cotte
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引用次数: 1

摘要

大地测量定位是慢滑事件的参考地球物理记录,但典型的日常解决方案将慢滑演化的研究局限于其长期动力学。在时间和空间上精确定位的伴随地震低频地震为在亚日常时间尺度上成像慢滑动力学提供了机会。在这里,我们表明,仅低频地震断层滑动的高分辨率时程就可以再现慢滑的大地测量记录,我们观察到慢滑主要受亚日常断层滑动动力学控制。然而,简单的线性模型无法适应整个慢滑周期中存在的复杂动力学,对慢滑周期不同阶段的分析表明,大地断层滑动与地震断层滑动的比率随时间变化。这表明低频震源区随着慢滑在力矩和面积上的增长而饱和。我们提出,与低频地震相关的板块边界流变不均匀性在慢滑破裂过程中没有起到重要作用,因此意味着它们的活动是驱动抗震滑动的附带活动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Subdaily Slow Fault Slip Dynamics Captured by Low-Frequency Earthquakes

Subdaily Slow Fault Slip Dynamics Captured by Low-Frequency Earthquakes

Geodetic positioning is the geophysical record of reference for slow slip events, but typical daily solutions limit studies of the evolution of slow slip to its long-term dynamics. Accompanying seismic low-frequency earthquakes located precisely in time and space provide an opportunity to image slow slip dynamics at subdaily time scales. Here we show that a high-resolution time history of low-frequency earthquake fault slip alone can reproduce the geodetic record of slow slip that we observe to be dominated by subdaily fault slip dynamics. However, a simple linear model cannot accommodate the complex dynamics present throughout the slow slip cycle, and an analysis of different phases of the slow slip cycle shows that the ratio of geodetic to seismic fault slip varies as a function of time. This suggests that the low-frequency earthquake source region saturates as slow slip grows in moment and area. We propose that rheological heterogeneities at the plate boundary associated with low-frequency earthquakes do not play a significant role in the slow slip rupture process, thus implying that their activity is incidental to the driving aseismic slip.

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