Tidal triggering of seismicity in the region of Palu, Central Sulawesi, Indonesia

IF 2.8 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Geodesy and Geodynamics Pub Date : 2023-07-01 DOI:10.1016/j.geog.2022.12.002

Ibnu Nurul Huda , Sébastien Lambert , Jean Souchay

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引用次数: 1

Abstract

This paper investigates the correlation between tidal stress and earthquakes for periods ranging from hours to months in the limited zone of the Palu region (Central Sulawesi, Indonesia). Through Schuster and binomial tests, we examined the relation between the seismicity (time density of seismic events) and tidal potential arising from the Moon and Sun, using all tidal components simultaneously and focusing on the estimation of specific terms. The results show significant correlations between the seismicity and tidal potential for S₂ (0.5 d) and O₁ (1.075 d) tidal components in the case of solely isolated earthquake events, particularly for shallow earthquakes. Meanwhile, there is a strong relationship between aftershocks and tidal components larger than the M_f period (13.661 d). Finally, the analysis of the temporal variation of the earthquake-tide relation reveals an optimal correlation for about six years before the 2018 great Palu earthquake. The correlation becomes insignificant afterwards.

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印度尼西亚中苏拉威西巴鲁地区地震活动的潮汐触发

本文研究了在帕卢地区(印度尼西亚苏拉威西岛中部)有限区域潮汐应力与地震之间从数小时到数月不等的相关性。通过Schuster和二项检验，我们研究了地震活动性(地震事件的时间密度)与由月球和太阳引起的潮汐势之间的关系，同时使用所有潮汐分量并侧重于特定项的估计。结果表明，在单独孤立的地震事件中，特别是浅层地震，S2 (0.5 d)和01 (1.075 d)潮汐分量的地震活动性与潮汐势之间存在显著的相关性。同时，余震与大于Mf周期(13.661 d)的潮汐分量之间存在较强的相关性。最后，对地震-潮汐关系的时间变化分析表明，2018年帕卢大地震前约6年的相关关系最优。之后相关性变得不显著。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geodesy and Geodynamics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

4.40

自引率

4.20%

发文量

566

审稿时长

69 days

期刊介绍： Geodesy and Geodynamics launched in October, 2010, and is a bimonthly publication. It is sponsored jointly by Institute of Seismology, China Earthquake Administration, Science Press, and another six agencies. It is an international journal with a Chinese heart. Geodesy and Geodynamics is committed to the publication of quality scientific papers in English in the fields of geodesy and geodynamics from authors around the world. Its aim is to promote a combination between Geodesy and Geodynamics, deepen the application of Geodesy in the field of Geoscience and quicken worldwide fellows'' understanding on scientific research activity in China. It mainly publishes newest research achievements in the field of Geodesy, Geodynamics, Science of Disaster and so on. Aims and Scope: new theories and methods of geodesy; new results of monitoring and studying crustal movement and deformation by using geodetic theories and methods; new ways and achievements in earthquake-prediction investigation by using geodetic theories and methods; new results of crustal movement and deformation studies by using other geologic, hydrological, and geophysical theories and methods; new results of satellite gravity measurements; new development and results of space-to-ground observation technology.