Migration diffusivity as a controlling factor in the duration of earthquake swarms

被引：15

作者：

Amezawa, Yuta ^{[1
]}

Maeda, Takuto ^{[1
]}

Kosuga, Masahiro ^{[1
]}

机构：

[1] Hirosaki Univ, Grad Sch Sci & Technol, 3 Bunkyo Cho, Hirosaki, Aomori 0368561, Japan

来源：

EARTH PLANETS AND SPACE | 2021年 / 73卷 / 01期

关键词：

Earthquake swarm; Hypocenter migration; Diffusivity; Duration; Triggering; TOHOKU-OKI EARTHQUAKE; NE JAPAN; HYPOCENTER MIGRATION; MAMMOTH MOUNTAIN; SEISMIC ACTIVITY; FAULT STRUCTURE; FLUID; EVOLUTION; CALIFORNIA; BENEATH;

D O I：

10.1186/s40623-021-01480-7

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Earthquake swarms exhibit highly uncertain temporal behavior. We investigated the relationship between the swarm duration and the diffusivity of hypocenter migration for triggered earthquake swarms in northeastern Japan. These parameters were systematically estimated by applying a diffusion model and using a unified definition of time windows for the initial and final stages of swarm activity. This approach detected a clear negative correlation between the diffusivity and swarm durations. The relation follows a power-law with an exponent of -0.5 to - 1.0. Examination of published data confirmed that this relationship globally holds under various localities and tectonic environments. These results suggest that diffusivity, and by extension, crustal permeability and fluid viscosity play a key role in controlling the duration of the fluid-driven swarms.

引用

页数：11

共 34 条

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