Triggered and recurrent slow slip in North Sulawesi, Indonesia

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Tectonophysics Pub Date : 2024-07-06 DOI:10.1016/j.tecto.2024.230416
N. Nijholt , W. Simons , R. Riva , J. Efendi , D. Sarsito , T. Broerse
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Abstract

Nearby faults interact with each other through the exchange of stress. However, the extent of fault interaction is poorly understood. In particular, interactions may lead to slow-slip activity, resulting in episodes of transient surface motion. Our study concentrates on Northwest Sulawesi (Indonesia), which hosts two fault zones with potential for major earthquakes and tsunamis: the strike-slip Palu-Koro fault and the Minahassa subduction zone. Thanks to a 20-year-long effort in geodetic monitoring, we are able to identify multiple periods during which surface velocities deviate from their interseismic trend. We use a Bayesian methodology with forward predictions of slip on the two fault interfaces to match the observations following the 2018 Mw7.5 Palu earthquake, and infer that both deep afterslip on the Palu-Koro fault and slow slip on the Minahassa subduction interface have caused the observed transient surface motion. This finding represents the first recording of a slow slip event on the Minahassa subduction interface. We also infer that the subduction interface and the strike-slip fault are likely interacting on a regular basis.

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印度尼西亚北苏拉威西岛的触发和经常性缓慢滑移
邻近的断层通过应力交换相互影响。然而,人们对断层相互作用的程度知之甚少。特别是,相互作用可能会导致缓慢的滑动活动,从而引发瞬时地表运动。我们的研究集中在苏拉威西岛西北部(印度尼西亚),这里有两个可能发生大地震和海啸的断层带:走向滑动的帕卢-科罗断层和米纳哈萨俯冲带。通过长达 20 年的大地测量监测,我们能够确定地表速度偏离地震间趋势的多个时期。我们使用贝叶斯方法对两个断层界面的滑动进行前瞻性预测,以与 2018 年帕卢 Mw7.5 地震后的观测结果相匹配,并推断帕卢-科罗断层的深层后滑动和米纳哈萨俯冲界面的缓慢滑动造成了观测到的瞬态地表运动。这一发现首次记录了米纳哈萨俯冲界面的缓慢滑动事件。我们还推断,俯冲界面和走向滑动断层可能经常发生相互作用。
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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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