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Detection of vertical motion during a slow‐slip event off the Boso Peninsula, Japan, by ocean bottom pressure gauges
Author(s) -
Sato Toshinori,
Hasegawa Seiya,
Kono Akihiro,
Shiobara Hajime,
Yagi Takeo,
Yamada Tomoaki,
Shinohara Masanao,
Usui Norihisa
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl072838
Subject(s) - geology , slip (aerodynamics) , peninsula , geodesy , tide gauge , ocean bottom , akaike information criterion , seismology , oceanography , sea level , physics , computer science , archaeology , machine learning , history , thermodynamics
Abstract We determined the slip distribution of a slow‐slip event (SSE) off the Boso Peninsula, Japan, from ocean bottom pressure gauge (OBP) observations. Most large SSEs occur under the ocean, and continuous OBP measurements have been used previously for their detection. These measurements require removing oceanic changes by subtracting averaged data of multiple stations from each OBP data set, a method that requires multiple stations. We developed a new method for extracting transient deformation due to a targeted event from data of a single OBP station. We fit a model that takes account of linear trends, seasonal variations, and other effects to the OBP data to detect transient deformation during the 2014 Boso SSE. We determined the OBP observation accuracy to be ±10 mm and detected 20 mm of uplift which was objectively confirmed by using Akaike's information criterion. Our method improves the potential for measuring slip distributions of SSEs under the ocean.