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Spatiotemporal variations in the stress field in the northeasternmost part of the NE Japan arc: constraints from microearthquakes
Earth, Planets and Space ( IF 3.362 ) Pub Date : 2020-08-10 , DOI: 10.1186/s40623-020-01245-8
Sumire Maeda , Toru Matsuzawa , Tomomi Okada , Hiroshi Katao , Takeyoshi Yoshida , Masahiro Kosuga , Makoto Otsubo

We determined focal mechanism solutions of microearthquakes and examined the stress field in the low-seismicity region from southern Hokkaido to eastern Aomori, NE Japan. The stress fields determined in this study comprise (1) a reverse faulting stress regime in southern Hokkaido with the axis of maximum compressional stress ( σ 1 ) being sub-horizontal and trending WNW–ESE, and (2) a stress regime in eastern Aomori to Tsugaru Strait that shows temporal variations and differential stress of less than tens of MPa. The spatiotemporal variation in stress from eastern Aomori to Tsugaru Strait might reflect the effects of the upper-plate bending and the 2011 M w 9.0 Tohoku-Oki earthquake. It also indicates that the compressional stress caused by the descending Pacific plate is relatively weak, which is similar to other areas in eastern parts of the NE Japan arc.

中文翻译:

日本东北弧东北部应力场的时空变化:来自微地震的约束

我们确定了微地震的震源机制解,并检查了从北海道南部到日本东北部青森东部的低地震区的应力场。本研究中确定的应力场包括 (1) 北海道南部的逆断层应力状态,最大压缩应力 (σ 1 ) 轴为亚水平和趋向 WNW-ESE,以及 (2) 青森东部的应力状态到津轻海峡的时间变化和应力差小于几十兆帕。从青森东部到津轻海峡的应力时空变化可能反映了上板弯曲和 2011 年 M w 9.0 东北-冲地震的影响。这也表明太平洋板块下降所造成的压应力相对较弱,
更新日期:2020-08-10
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