Temporal Variations in QP−1 ${Q}_{P}^{-1}$ and QS−1 ${Q}_{S}^{-1}$ Above a Megathrust Following Episodic Slow‐Slip Events
Abstract Recent observations beneath central Japan have shown that periodic fluid drainage occurs during slow‐slip events (SSEs) based on temporal variations in QP−1 above the megathrust boundary of the subducting Philippine Sea slab. However, no previous studies have estimated associated QS−1. A co...
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| Format: | Article |
| Language: | English |
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Wiley
2023-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2023GL103577 |
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| author | Yosuke Ito Junichi Nakajima |
| author_facet | Yosuke Ito Junichi Nakajima |
| author_sort | Yosuke Ito |
| collection | DOAJ |
| description | Abstract Recent observations beneath central Japan have shown that periodic fluid drainage occurs during slow‐slip events (SSEs) based on temporal variations in QP−1 above the megathrust boundary of the subducting Philippine Sea slab. However, no previous studies have estimated associated QS−1. A comparison of QP−1 and QS−1 can provide clues to the mechanism of seismic attenuation because of different propagation characteristics of the two waves. We estimate temporal variations in QP−1 and QS−1 via spectral analyses of waveform data from November 2009 to August 2021 period. The results indicate that both QP−1 and QS−1 exhibit temporal variations at about 1‐year periodicity and there are systematic differences between QP−1 and QS−1 that QS−1 have smaller values, less insignificant variation, and weaker correlations with SSEs. Furthermore, QP−1/QS−1 increases concurrent with SSEs. These differences suggest that attenuation is caused by the wave‐induced fluid flow. QP−1/QS−1 could be an important parameter for detecting the presence of fluid. |
| format | Article |
| id | doaj-art-47f6d51568bc4a4ea8707afb7251bf5d |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2023-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-47f6d51568bc4a4ea8707afb7251bf5d2025-08-20T02:11:58ZengWileyGeophysical Research Letters0094-82761944-80072023-07-015014n/an/a10.1029/2023GL103577Temporal Variations in QP−1 ${Q}_{P}^{-1}$ and QS−1 ${Q}_{S}^{-1}$ Above a Megathrust Following Episodic Slow‐Slip EventsYosuke Ito0Junichi Nakajima1School of Science Earth and Planetary Sciences Tokyo Institute of Technology Tokyo JapanSchool of Science Earth and Planetary Sciences Tokyo Institute of Technology Tokyo JapanAbstract Recent observations beneath central Japan have shown that periodic fluid drainage occurs during slow‐slip events (SSEs) based on temporal variations in QP−1 above the megathrust boundary of the subducting Philippine Sea slab. However, no previous studies have estimated associated QS−1. A comparison of QP−1 and QS−1 can provide clues to the mechanism of seismic attenuation because of different propagation characteristics of the two waves. We estimate temporal variations in QP−1 and QS−1 via spectral analyses of waveform data from November 2009 to August 2021 period. The results indicate that both QP−1 and QS−1 exhibit temporal variations at about 1‐year periodicity and there are systematic differences between QP−1 and QS−1 that QS−1 have smaller values, less insignificant variation, and weaker correlations with SSEs. Furthermore, QP−1/QS−1 increases concurrent with SSEs. These differences suggest that attenuation is caused by the wave‐induced fluid flow. QP−1/QS−1 could be an important parameter for detecting the presence of fluid.https://doi.org/10.1029/2023GL103577slow‐slip eventsattenuationfluid |
| spellingShingle | Yosuke Ito Junichi Nakajima Temporal Variations in QP−1 ${Q}_{P}^{-1}$ and QS−1 ${Q}_{S}^{-1}$ Above a Megathrust Following Episodic Slow‐Slip Events Geophysical Research Letters slow‐slip events attenuation fluid |
| title | Temporal Variations in QP−1 ${Q}_{P}^{-1}$ and QS−1 ${Q}_{S}^{-1}$ Above a Megathrust Following Episodic Slow‐Slip Events |
| title_full | Temporal Variations in QP−1 ${Q}_{P}^{-1}$ and QS−1 ${Q}_{S}^{-1}$ Above a Megathrust Following Episodic Slow‐Slip Events |
| title_fullStr | Temporal Variations in QP−1 ${Q}_{P}^{-1}$ and QS−1 ${Q}_{S}^{-1}$ Above a Megathrust Following Episodic Slow‐Slip Events |
| title_full_unstemmed | Temporal Variations in QP−1 ${Q}_{P}^{-1}$ and QS−1 ${Q}_{S}^{-1}$ Above a Megathrust Following Episodic Slow‐Slip Events |
| title_short | Temporal Variations in QP−1 ${Q}_{P}^{-1}$ and QS−1 ${Q}_{S}^{-1}$ Above a Megathrust Following Episodic Slow‐Slip Events |
| title_sort | temporal variations in qp 1 q p 1 and qs 1 q s 1 above a megathrust following episodic slow slip events |
| topic | slow‐slip events attenuation fluid |
| url | https://doi.org/10.1029/2023GL103577 |
| work_keys_str_mv | AT yosukeito temporalvariationsinqp1qp1andqs1qs1aboveamegathrustfollowingepisodicslowslipevents AT junichinakajima temporalvariationsinqp1qp1andqs1qs1aboveamegathrustfollowingepisodicslowslipevents |