Seismic hazard and tectonic stress in Halmahera, Indonesia based on b-value and apparent stress analyses

IF 2.1 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Physics of the Earth and Planetary Interiors Pub Date : 2026-03-01 Epub Date: 2026-02-01 DOI:10.1016/j.pepi.2026.107512

Muh. Farid Wajedy , Saaduddin , Muhammad Altin Massinai , Fahruddin Fahruddin , Ahmad Thariq

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Abstract

Halmahera is one of the eastern regions of Indonesia that experiences intense tectonic activity due to the convergence of four major tectonic plates: the Eurasian, Australian, Pacific, and Philippine Sea Plates. Given the region's complex tectonic setting and seismic potential, this study aims to investigate the prevailing stress conditions in Halmahera using b-value and apparent stress analyses. The dataset comprises earthquake events from 1970 to 2024 with magnitudes ranging from 3.0 to 5.9 and focal depths between 10 and 50 km. The results show that the b-values in Halmahera range from 0.886 to 1.928, while the apparent stress values vary between 0.049 and 0.165 MPa. Our analysis reveals that the northwestern part of Halmahera exhibits significant stress accumulation, likely associated with ongoing subduction processes, indicating a potential for large-magnitude earthquakes. These findings highlight the importance of continuous monitoring and targeted seismic hazard mitigation efforts, particularly in the northwestern Halmahera region.

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基于b值和视应力分析的印尼Halmahera地震危险性和构造应力

哈马赫拉是印度尼西亚东部地区之一，由于欧亚海、澳大利亚海、太平洋海和菲律宾海四大板块的汇聚而经历了强烈的构造活动。考虑到该地区复杂的构造环境和地震潜力，本研究旨在利用b值和表观应力分析来研究Halmahera地区的主要应力条件。该数据集包括1970年至2024年的地震事件，震级为3.0至5.9级，震源深度为10至50公里。结果表明：Halmahera地区的b值在0.886 ~ 1.928之间，视应力值在0.049 ~ 0.165 MPa之间；我们的分析表明，Halmahera西北部表现出明显的应力积累，可能与持续的俯冲过程有关，表明可能发生大地震。这些发现强调了持续监测和有针对性的地震减灾工作的重要性，特别是在Halmahera西北部地区。

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来源期刊

Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理

CiteScore

5.00

自引率

4.30%

发文量

审稿时长

18.5 weeks

期刊介绍： Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.