Unravelling the contribution of early postseismic deformation using sub-daily GNSS positioning
書誌事項
- 公開日
- 2019-02-11
- 権利情報
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- https://creativecommons.org/licenses/by/4.0
- https://creativecommons.org/licenses/by/4.0
- DOI
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- 10.1038/s41598-019-39038-z
- 公開者
- Springer Science and Business Media LLC
説明
<jats:title>Abstract</jats:title><jats:p>After large earthquakes, parts of the fault continue to slip for days to months during the afterslip phase, a behaviour documented for many earthquakes. Yet, little is known about the early stage, i.e., from minutes to hours after the mainshock. Its detailed study requires continuous high-rate position time series close to the fault, and advanced signal processing to accurately extract the surface displacements. Here, we use refined kinematic precise point positioning processing to document the early postseismic deformation for three earthquakes along the South American subduction zone (2010 M<jats:sub><jats:italic>w</jats:italic></jats:sub>8.8 Maule, Chile; 2015 M<jats:sub><jats:italic>w</jats:italic></jats:sub>8.3 Illapel, Chile; 2016 M<jats:sub><jats:italic>w</jats:italic></jats:sub>7.6 Pedernales, Ecuador). First, we show that early afterslip generates significant surface displacement as early as a few tens of minutes after the earthquake. Our analysis of the time series indicates that, over the first 36 hours, more than half of the displacement occurs within the first 12 hours, a time window often disregarded with daily positioning. Thus, estimates of coseismic offsets can be biased by more than 10% if early postseismic displacements are acknowledged as coseismic ones. Finally, these results highlight the difficulty to accurately evaluate the different contribution to the seismic cycle budget and thus the associated hazard on faults.</jats:p>
収録刊行物
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- Scientific Reports
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Scientific Reports 9 (1), 1775-, 2019-02-11
Springer Science and Business Media LLC
