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Imaging evolution of Cascadia slow-slip event using high-rate GPS
The slip history of short-term slow slip event (SSE) is typically inferred from daily Global Positioning System (GPS) data, which, however, cannot image the sub-daily processes, leaving the underlying mechanisms of SSEs elusive. To address the temporal resolution issue, we attempted to employ the ki...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9065071/ https://www.ncbi.nlm.nih.gov/pubmed/35504923 http://dx.doi.org/10.1038/s41598-022-10957-8 |
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author | Itoh, Yuji Aoki, Yosuke Fukuda, Junichi |
author_facet | Itoh, Yuji Aoki, Yosuke Fukuda, Junichi |
author_sort | Itoh, Yuji |
collection | PubMed |
description | The slip history of short-term slow slip event (SSE) is typically inferred from daily Global Positioning System (GPS) data, which, however, cannot image the sub-daily processes, leaving the underlying mechanisms of SSEs elusive. To address the temporal resolution issue, we attempted to employ the kinematic subdaily GPS analysis, which has never been applied to SSE studies because its signal-to-noise ratio has been believed too low. By carefully post-processing sub-daily positions to remove non-tectonic position fluctuation, our 30-min kinematic data clearly exhibits the transient motion of a few mm during one Cascadia SSE. A spatiotemporal slip image by inverting the 30-min data exhibits a multi-stage evolution; it consists of an isotropic growth of SSE followed by an along-strike migration and termination within the rheologically controlled down-dip width. This transition at the slip growth mode is similar to the rupture growth of regular earthquakes, implying the presence of common mechanical factors behind the two distinct slip phenomena. The comparison with a slip inversion of the daily GPS demonstrates the current performance and limitation of the subdaily data in the SSE detection and imaging. Better understanding of the non-tectonic noise in the kinematic GPS analysis will further improve the temporal resolution of SSE. |
format | Online Article Text |
id | pubmed-9065071 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-90650712022-05-04 Imaging evolution of Cascadia slow-slip event using high-rate GPS Itoh, Yuji Aoki, Yosuke Fukuda, Junichi Sci Rep Article The slip history of short-term slow slip event (SSE) is typically inferred from daily Global Positioning System (GPS) data, which, however, cannot image the sub-daily processes, leaving the underlying mechanisms of SSEs elusive. To address the temporal resolution issue, we attempted to employ the kinematic subdaily GPS analysis, which has never been applied to SSE studies because its signal-to-noise ratio has been believed too low. By carefully post-processing sub-daily positions to remove non-tectonic position fluctuation, our 30-min kinematic data clearly exhibits the transient motion of a few mm during one Cascadia SSE. A spatiotemporal slip image by inverting the 30-min data exhibits a multi-stage evolution; it consists of an isotropic growth of SSE followed by an along-strike migration and termination within the rheologically controlled down-dip width. This transition at the slip growth mode is similar to the rupture growth of regular earthquakes, implying the presence of common mechanical factors behind the two distinct slip phenomena. The comparison with a slip inversion of the daily GPS demonstrates the current performance and limitation of the subdaily data in the SSE detection and imaging. Better understanding of the non-tectonic noise in the kinematic GPS analysis will further improve the temporal resolution of SSE. Nature Publishing Group UK 2022-05-03 /pmc/articles/PMC9065071/ /pubmed/35504923 http://dx.doi.org/10.1038/s41598-022-10957-8 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Itoh, Yuji Aoki, Yosuke Fukuda, Junichi Imaging evolution of Cascadia slow-slip event using high-rate GPS |
title | Imaging evolution of Cascadia slow-slip event using high-rate GPS |
title_full | Imaging evolution of Cascadia slow-slip event using high-rate GPS |
title_fullStr | Imaging evolution of Cascadia slow-slip event using high-rate GPS |
title_full_unstemmed | Imaging evolution of Cascadia slow-slip event using high-rate GPS |
title_short | Imaging evolution of Cascadia slow-slip event using high-rate GPS |
title_sort | imaging evolution of cascadia slow-slip event using high-rate gps |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9065071/ https://www.ncbi.nlm.nih.gov/pubmed/35504923 http://dx.doi.org/10.1038/s41598-022-10957-8 |
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