ESTIMATION OF RUPTURE DIRECTION AND FREQUENCY-DEPENDENT RUPTURE DIRECTIVITY EFFECT OF NORTHWESTERN CHIBA PREFECTURE EARTHQUAKES

Q2 Engineering

Journal of Structural and Construction Engineering Pub Date : 2023-10-01 DOI:10.3130/aijs.88.1417

Toshimi SATOH

引用次数: 0

Abstract

Rupture directions of 17 northwestern Chiba prefecture earthquakes with Mw3.8-5.9 are estimated assuming the unilateral rupture using azimuth-dependency of apparent source spectral ratios. Rupture directions of at least near 1/3 of earthquakes have frequency-dependency. This result can be interpreted that different-sized strong motion generation areas are located at the different directions from the hypocenter. The largest two repeating earthquakes with Mw5.9 are estimated to have the same stress drop, but they ruptured to different direction each other and the directions have frequency-dependency. Ground motions within 100 km of most of earthquakes have rupture directivity effects up to 10Hz.

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千叶县西北部地震破裂方向及频率相关破裂方向性效应的估计

利用视震源谱比的方位角依赖性，估计了千叶县西北部17次mw3.8 ~ 5.9级地震的单向破裂方向。至少有近1/3的地震的破裂方向与频率有关。这一结果可以解释为不同大小的强震发生区位于离震源不同的方向。估计最大的两次5.9级重复地震具有相同的应力降，但它们彼此破裂的方向不同，并且方向具有频率依赖性。大多数地震100公里以内的地面运动具有高达10Hz的破裂指向性效应。

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

Journal of Structural and Construction Engineering Engineering-Architecture

CiteScore

0.80

自引率

0.00%

发文量

104

审稿时长

24 weeks

期刊介绍： The Architectural Institute of Japan’s Journal of Structural and Construction Engineering aim to pursue theories for building and maintaining pieces of architecture as well as the cities or areas surrounding them, and to accumulate and systematize the knowledge needed to put those theories into practice. The Journal of Structural and Construction Engineering focuses on research results in the specific fields of “building materials and construction” and “structures.” Accordingly, it compiles articles in the following areas, disseminates relevant information, and hosts discussions: ・Concrete, steel, and inorganic materials ・Timber and organic materials ・Finishing materials ・Construction and quality management ・Applied mechanics ・Loads and reliability on structures ・Building foundations ・Timber structures ・Steel structures ・Reinforced concrete structures ・Shell and spatial structures ・Engineering seismology and structural dynamics ・Other composite structures