Detectability analysis of interplate fault slips in the Nankai subduction thrust using seafloor observation instruments

Agata, Ryoichiro; Hori, Takane; Ariyoshi, Keisuke; Ichimura, Tsuyoshi

doi:10.1007/s11001-019-09380-y

Cited by 15 publications

(8 citation statements)

References 28 publications

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“…Both events were smaller than the detectable limit for shallow SSEs when using a DONET pressure gauge (Figure S8). Note that the detectable limit of shallow SSEs using only onshore GNSS stations is larger than M W 7 (e.g., Agata et al, 2019;Suito, 2016). Although GNSS-A is a powerful tool for monitoring plate motions, its time interval is approximately several points per year.…”

Section: Geophysical Research Lettersmentioning

confidence: 99%

Migrations and Clusters of Shallow Very Low Frequency Earthquakes in the Regions Surrounding Shear Stress Accumulation Peaks Along the Nankai Trough

Takemura

Noda

Kubota

et al. 2019

Geophysical Research Letters

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The spatiotemporal characteristics of shallow slow earthquake activity are linked to the tectonic environments of shallow plate boundaries. In this work, the spatiotemporal variations of shallow very low frequency earthquake (SVLFE) activity along the Nankai Trough were investigated using a cross‐correlation analysis. The SVLFEs migrated or spread eastward along the strike direction of the trench during large SVLFE episodes. Migrations and clusters of SVLFEs suggest the occurrence of shallow slow slip events. The observed lateral variations in SVLFE activity patterns reflect the heterogeneous distributions of effective strengths at the shallow plate boundary along the Nankai Trough. Migrations and clusters of SVLFEs tended to be concentrated in the regions surrounding the stress accumulation peaks on the Philippine Sea Plate boundary. The stress accumulated in the transitional regions between high‐strength and low‐strength zones can be released by shallow slow earthquakes.

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Section: Geophysical Research Lettersmentioning

confidence: 99%

Migrations and Clusters of Shallow Very Low Frequency Earthquakes in the Regions Surrounding Shear Stress Accumulation Peaks Along the Nankai Trough

Takemura

Noda

Kubota

et al. 2019

Geophysical Research Letters

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“…The accuracy of SSE detection was also examined by integrating both on-land and seafloor observation networks (Agata et al, 2019), but this is beyond the scope of this study.…”

Section: Comprehensive Synthetic Test For Pcamentioning

confidence: 99%

Non-tidal oceanographic fluctuation characteristics recorded in DONET ocean-bottom pressure time series using principal component analysis

Otsuka

Ohta

Hino

et al. 2023

Preprint

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We applied a principal component analysis to the long-term continuous data from a dense and wide ocean bottom pressure gauge network • Our principal component analysis revealed the spatiotemporal characteristics of the meandering of the ocean geostrophic currents • We propose a method to discriminate the transient tectonic signal from the bottom pressure data based on amplitudes of principal component

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“…However, it is still difficult to evaluate small deformations due to slow slip events (SSEs), which are geodetic slips of slow earthquakes with durations of several days to years. SSEs with Mw 5.5 and 6.5 are the detectable limits in onshore and offshore regions, even when using dense Global Navigation Satellite System observations in Japan (e.g., Agata et al., 2019; Nishimura et al., 2013; Suito, 2016).…”

Section: Introductionmentioning

confidence: 99%

Source Characteristics and Along‐Strike Variations of Shallow Very Low Frequency Earthquake Swarms on the Nankai Trough Shallow Plate Boundary

Takemura

Baba

Yabe

et al. 2022

Geophysical Research Letters

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We detected shallow very low frequency earthquakes (VLFEs) off the Cape Muroto and Kii Channel in the Nankai subduction zone and estimated their moment rate functions. Combining the new and previously estimated catalogs, we obtained the comprehensive catalog of shallow VLFE moment rate functions along the Nankai Trough. We defined the shallow VLFE swarms and investigated the scaling relationships of their cumulative moments, activity area, and durations in each region. Detected swarms were considered candidates for shallow slow slip events. A similar scaling relationship was observed between the cumulative moments and activity areas, irrespective of regions. It indicates similar stress drops in each region. However, the relationship between the cumulative moments and durations varied. This difference was explained by the along‐strike variations in the faulting conditions of shallow slow earthquakes, such as material or hydrological properties.

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Detectability analysis of interplate fault slips in the Nankai subduction thrust using seafloor observation instruments

Cited by 15 publications

References 28 publications

Migrations and Clusters of Shallow Very Low Frequency Earthquakes in the Regions Surrounding Shear Stress Accumulation Peaks Along the Nankai Trough

Migrations and Clusters of Shallow Very Low Frequency Earthquakes in the Regions Surrounding Shear Stress Accumulation Peaks Along the Nankai Trough

Non-tidal oceanographic fluctuation characteristics recorded in DONET ocean-bottom pressure time series using principal component analysis

Source Characteristics and Along‐Strike Variations of Shallow Very Low Frequency Earthquake Swarms on the Nankai Trough Shallow Plate Boundary

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