Unsupervised machine learning reveals slab hydration variations from deep earthquake distributions beneath the northwest Pacific
Unsupervised machine learning reveals slab hydration variations from deep earthquake distributions beneath the northwest Pacific
复制标题
无监督机器学习揭示了西北太平洋下方深层地震分布的板片水化变化
DOI:
10.1038/s43247-022-00377-x
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发表时间:
2022
影响因子:
7.9
通讯作者:
Chen, Min
中科院分区:
文献类型:
--
作者:
Mao, Gilbert L.;Ferrand, Thomas P.;Li, Jiaqi;Zhu, Brian;Xi, Ziyi;Chen, Min
Although transformational faulting in the rim of the metastable olivine wedge is hypothesized as a triggering mechanism of deep-focus earthquakes, there is no direct evidence of such rim. Variations of thebvalue – slope of the Gutenberg-Richter distribution – have been used to decipher triggering and rupture mechanisms of deep earthquakes. However, detection limits prevent full understanding of these mechanisms. Using the Japan Meteorological Agency catalog, we estimatebvalues of deep earthquakes in the northwestern Pacific Plate, clustered in four regions with unsupervised machine learning. Theb-value analysis of Honshu and Izu deep seismicity reveals a kink at magnitude 3.7–3.8, where thebvalue abruptly changes from 1.4–1.7 to 0.6–0.7. The anomalously highbvalues for small earthquakes highlight enhanced transformational faulting, likely catalyzed by deep hydrous defects coinciding with the unstable rim of the metastable olivine wedge, the thickness of which we estimate at1 km.
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DOI:
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发表时间:
1995
期刊:
影响因子:
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1960
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