Seismological Observations on Amplitude‐Dependent Energy Dissipation in the Crust and Uppermost Mantle
Abstract The amplitude‐dependent seismic attenuation in the crust and uppermost mantle was investigated using spectral analysis of crustal and intraslab earthquakes that occurred in two areas in northeastern Japan. P‐wave attenuation (Q−1) was found to be weakly proportional to amplitude (A) in both...
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | Geophysical Research Letters |
| Online Access: | https://doi.org/10.1029/2024GL112427 |
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| _version_ | 1832593480383201280 |
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| author | Hayato Tero Junichi Nakajima |
| author_facet | Hayato Tero Junichi Nakajima |
| author_sort | Hayato Tero |
| collection | DOAJ |
| description | Abstract The amplitude‐dependent seismic attenuation in the crust and uppermost mantle was investigated using spectral analysis of crustal and intraslab earthquakes that occurred in two areas in northeastern Japan. P‐wave attenuation (Q−1) was found to be weakly proportional to amplitude (A) in both areas, following the relationship, Q−1∝An. Quantitative analysis reveals that amplitude‐dependent attenuation is more pronounced in the uppermost mantle (n ∼ 0.16) than in the crust (n ∼ 0.05). This depth‐dependent behavior of attenuation may be attributed to increasing temperature and pressure, which enhance dislocation density and mobility. Our findings challenge the common assumption of amplitude‐independent attenuation. Although we infer dislocation mechanisms as the primary cause of the amplitude‐dependent energy dissipation, further experimental studies under high temperature and pressure conditions are necessary for better understanding of the complex nature of seismic attenuation and the underlying processes. |
| format | Article |
| id | doaj-art-801cdb8ccbdd4075b8a59fcde81804ae |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-801cdb8ccbdd4075b8a59fcde81804ae2025-01-20T13:05:57ZengWileyGeophysical Research Letters0094-82761944-80072025-01-01521n/an/a10.1029/2024GL112427Seismological Observations on Amplitude‐Dependent Energy Dissipation in the Crust and Uppermost MantleHayato Tero0Junichi Nakajima1Department of Earth and Planetary Sciences School of Science Institute of Science Tokyo Tokyo JapanDepartment of Earth and Planetary Sciences School of Science Institute of Science Tokyo Tokyo JapanAbstract The amplitude‐dependent seismic attenuation in the crust and uppermost mantle was investigated using spectral analysis of crustal and intraslab earthquakes that occurred in two areas in northeastern Japan. P‐wave attenuation (Q−1) was found to be weakly proportional to amplitude (A) in both areas, following the relationship, Q−1∝An. Quantitative analysis reveals that amplitude‐dependent attenuation is more pronounced in the uppermost mantle (n ∼ 0.16) than in the crust (n ∼ 0.05). This depth‐dependent behavior of attenuation may be attributed to increasing temperature and pressure, which enhance dislocation density and mobility. Our findings challenge the common assumption of amplitude‐independent attenuation. Although we infer dislocation mechanisms as the primary cause of the amplitude‐dependent energy dissipation, further experimental studies under high temperature and pressure conditions are necessary for better understanding of the complex nature of seismic attenuation and the underlying processes.https://doi.org/10.1029/2024GL112427 |
| spellingShingle | Hayato Tero Junichi Nakajima Seismological Observations on Amplitude‐Dependent Energy Dissipation in the Crust and Uppermost Mantle Geophysical Research Letters |
| title | Seismological Observations on Amplitude‐Dependent Energy Dissipation in the Crust and Uppermost Mantle |
| title_full | Seismological Observations on Amplitude‐Dependent Energy Dissipation in the Crust and Uppermost Mantle |
| title_fullStr | Seismological Observations on Amplitude‐Dependent Energy Dissipation in the Crust and Uppermost Mantle |
| title_full_unstemmed | Seismological Observations on Amplitude‐Dependent Energy Dissipation in the Crust and Uppermost Mantle |
| title_short | Seismological Observations on Amplitude‐Dependent Energy Dissipation in the Crust and Uppermost Mantle |
| title_sort | seismological observations on amplitude dependent energy dissipation in the crust and uppermost mantle |
| url | https://doi.org/10.1029/2024GL112427 |
| work_keys_str_mv | AT hayatotero seismologicalobservationsonamplitudedependentenergydissipationinthecrustanduppermostmantle AT junichinakajima seismologicalobservationsonamplitudedependentenergydissipationinthecrustanduppermostmantle |