Gravity changes observed between 2004 and 2009 near the Tokai slow-slip area and prospects for detecting fluid flow during future slow-slip events

Tanaka, Yoshiyuki; Kato, Aitaro; Sugano, Takayuki; Fu, Guangyu; Zhang, Xinlin; Furuya, Masato; Sun, Wenke; Okubo, Shuhei; Matsumoto, Shigeo; Honda, Masaki; Sugawara, Yasuhiro; Ueda, Isao; Kusaka, Masaaki; Ishihara, Misao

Gravity changes observed between 2004 and 2009 near the Tokai slow-slip area and prospects for detecting fluid flow during future slow-slip events

Tanaka, Yoshiyuki; Kato, Aitaro; Sugano, Takayuki et al.

Earth, Planets and Space, 2010, 62(12), 905-913

Permalink : https://hdl.handle.net/2115/52817

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アクセス権	open access
URI	https://hdl.handle.net/2115/52817
タイトル	Gravity changes observed between 2004 and 2009 near the Tokai slow-slip area and prospects for detecting fluid flow during future slow-slip events
著者	Tanaka, Yoshiyuki ; Kato, Aitaro ; Sugano, Takayuki ; Fu, Guangyu ; Zhang, Xinlin ; Furuya, Masato ; Sun, Wenke ; Okubo, Shuhei ; Matsumoto, Shigeo ; Honda, Masaki ; Sugawara, Yasuhiro ; Ueda, Isao ; Kusaka, Masaaki ; Ishihara, Misao
著者名 Tanaka, Yoshiyuki
著者名 Kato, Aitaro
著者名 Sugano, Takayuki
著者名 Fu, Guangyu
著者名 Zhang, Xinlin
著者名 Furuya, Masato
著者名 Sun, Wenke
著者名 Okubo, Shuhei
著者名 Matsumoto, Shigeo
著者名 Honda, Masaki
著者名 Sugawara, Yasuhiro
著者名 Ueda, Isao
著者名 Kusaka, Masaaki
著者名 Ishihara, Misao
言語	英語
キーワード	Slow earthquake
	slow slip
	gravity
	fluid
	poroelasticity
	permeability
	subduction zone
	crustal deformation
発行日	2010-02-03
出版者	TERRAPUB
収録物名	Earth, Planets and Space
巻(号)	62(12)
ページ	905-913
抄録	Slow-slip events (SSEs) have been observed in many plate-boundary zones along the circum-Pacific seismic belt. Previous studies have revealed that high-pressure fluids supplied from the subducted oceanic plate can generate SSEs. However, the behavior of these fluids during an SSE has not been fully elucidated. This paper discusses possible fluid migration along the plate boundary on the basis of spatiotemporal gravity changes observed by absolute and relative gravimeters during a long-term SSE in the Tokai district, Japan. Relative-gravity data are sometimes unreliable because of limited observation accuracies and possible noise produced by groundwater. Nevertheless, the observed gravity changes show a systematic pattern of spatial changes over the slow-slip area. This pattern can be explained by a poroelastic model assuming fluid migration along the plate interface, for which an inversion indicates a permeability of about 10-15 m2. This lies within the range of permeability values inferred by other studies in slow-slip areas. Long-term SSEs have occurred repeatedly in the Tokai district. If the permeability remains greater than 10-15 m2 during a future SSE, it will be possible to detect fluid migration by improving the observation accuracy to the 1-μGal level and accurately evaluating groundwater-related noise.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
PISSN	1343-8832
EISSN	1880-5981
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.5047/eps.2010.11.003