Shallow very-low-frequency earthquakes accompany slow slip events in the Nankai subduction zone

Masaru Nakano (), Takane Hori, Eiichiro Araki, Shuichi Kodaira and Satoshi Ide
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Masaru Nakano: Japan Agency for Marine-Earth Science and Technology
Takane Hori: Japan Agency for Marine-Earth Science and Technology
Eiichiro Araki: Japan Agency for Marine-Earth Science and Technology
Shuichi Kodaira: Japan Agency for Marine-Earth Science and Technology
Satoshi Ide: University of Tokyo

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Recent studies of slow earthquakes along plate boundaries have shown that tectonic tremor, low-frequency earthquakes, very-low-frequency events (VLFEs), and slow-slip events (SSEs) often accompany each other and appear to share common source faults. However, the source processes of slow events occurring in the shallow part of plate boundaries are not well known because seismic observations have been limited to land-based stations, which offer poor resolution beneath offshore plate boundaries. Here we use data obtained from seafloor observation networks in the Nankai trough, southwest of Japan, to investigate shallow VLFEs in detail. Coincident with the VLFE activity, signals indicative of shallow SSEs were detected by geodetic observations at seafloor borehole observatories in the same region. We find that the shallow VLFEs and SSEs share common source regions and almost identical time histories of moment release. We conclude that these slow events arise from the same fault slip and that VLFEs represent relatively high-frequency fluctuations of slip during SSEs.

Date: 2018
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DOI: 10.1038/s41467-018-03431-5

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