Tectonophysical Features of the Load–Unload Response Ratio (LURR) Caused by the Tokachi-Oki Earthquake (September 25, 2003, Mw = 8.3)

IF 0.9 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Russian Journal of Pacific Geology Pub Date : 2024-08-09 DOI:10.1134/s1819714024700118

A. S. Zakupin, A. Yu. Polets

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Abstract

The paper presents the results of retrospective and tectonophysical analysis of the Tokachi-Oki earthquake source area on the September 25, 2003 (M_w = 8.3). Particular attention is paid to the Hidaka tectonic belt, the structures of which were affected by the Tokachi-Oki earthquake. The load–unload response ratio (LURR) method was applied at sufficient spatial (a square with a side of about 400 km) and temporal (continuous 20-year period) intervals to consider the results reliable. The forerunners of the Tokachi-Oki earthquake on the September 25, 2003, were revealed (on average, two years before the seismic event), which strictly determined the earthquake location. The data obtained with The method of cataclastic analysis (MCA), together with LURR data, made it possible to establish the stages of instability development in the Hidaka collision zone. The Hidaka tectonic belt became outlined by destruction zones (mainly horizontal compression) from 1997 to 2003 (up to the Tokachi-Oki earthquake). LURR anomalies were detected along the belt a couple of years before the earthquake. The prediction of the Tokachi-Oki earthquake by the LURR method is one of the most reliable in our practice.

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由十胜隐岐地震（2003 年 9 月 25 日，Mw = 8.3）引起的荷载-非荷载反应比 (LURR) 的构造物理特征

摘要本文介绍了对 2003 年 9 月 25 日（Mw = 8.3）十胜冲地震震源区的回顾和构造物理分析结果。本文特别关注了日高构造带，该构造带的结构受到了十胜-冲地震的影响。在足够的空间间隔（边长约 400 千米的正方形）和时间间隔（连续 20 年）内采用了荷载-卸载反应比（LURR）方法，以确保结果的可靠性。揭示了 2003 年 9 月 25 日十胜冲地震的先兆（平均在地震发生前两年），从而严格确定了地震位置。通过 "崩塌分析法"（MCA）获得的数据与 LURR 数据相结合，可以确定日高碰撞带的不稳定性发展阶段。从 1997 年到 2003 年（直到 Tokachi-Oki 地震），日高构造带被破坏带（主要是水平压缩）勾勒出来。在地震发生前几年，沿该构造带发现了 LURR 异常。在我们的实践中，用 LURR 方法预测十胜冲地震是最可靠的方法之一。

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来源期刊

Russian Journal of Pacific Geology 地学-地球科学综合

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Russian Journal of Pacific Geology publishes the results of research on the Earth crust and mantle composition and provides articles on the geological structure and patterns of distribution of mineral deposits in the Pacific Ocean, marginal seas and continental margins. It discusses the topics of stratigraphy, sedimentology, magmatic activity, and seismicity. The journal deals with the problems of lithosphere plates tectonics, and offers the results of neotectonic, geomorphological, geodesic, environmental and mining studies in the Pacific region. The journal accepts theoretical, methodical and philosophical articles covering general issues of geology, geophysics, geochemistry, geoecology and mining. The journal also publishes critical notes and comments, and reviews.