Spatial and temporal evolution of the long-term slow slip in the Bungo Channel, Japan

Ozawa, Shinzaburo; Yarai, Hiroshi; Imakiire, Tetsuro; Tobita, Mikio

doi:10.5047/eps.2012.06.009

Cited by 55 publications

(60 citation statements)

References 10 publications

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“…1). In the Bungo Channel, most of these long-term SSEs were nearly of equal magnitudes (Ozawa et al 2013;Kobayashi and Yamamoto 2011), although smaller ones have also occurred (Ozawa 2017). In the Tokai region, the duration of the 2000-2005 longterm SSE (Suito and Ozawa 2009) was longer than those of earlier events detected by tide gauge and tiltmeter data (Kobayashi and Yoshida 2004;Yamamoto et al 2005).…”

Section: Introductionmentioning

confidence: 87%

“…The SSE that started in 2014 seems to have declined by the end of 2016. Furthermore, in the Bungo Channel area at 132°-133°E, the long-term SSEs in 1996-1998 (Hirose et al 1999(Ozawa et al 2007, and 2010 (Ozawa et al 2013) were matched by periods of high correlation values (Fig. 6).…”

Section: Spatiotemporal Distribution Of Displacementsmentioning

confidence: 99%

“…The long-term SSEs along the Nankai Trough are centered at a depth of 25-30 km on the Philippine Sea plate, and major surface displacements extend over a 100-km square above the source region (e.g., Ozawa et al , 2013Kobayashi 2014). The latitude of the 25-km depth contour of the Philippine Sea plate (plate configuration of Hirose et al 2008) in the Nankai Trough region (oblique rectangle in Fig.…”

Section: Detection Of Long-term Ssesmentioning

confidence: 99%

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Objective detection of long-term slow slip events along the Nankai Trough using GNSS data (1996–2016)

Kobayashi¹

2017

Earth Planets Space

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This paper presents a method for objective detection of long-term slow slip events with durations on the order of years, on the plate boundary along the Nankai Trough, relying on global navigation satellite system daily coordinate data. The Chugoku region of Japan was held fixed to remove common mode errors, and a displacement component was calculated relative to the direction of plate subduction. Correlations were then calculated between this displacement component and a 3-year ramp function with a 1-year slope. Nearly all periods of strong correlation coincide with periods of previously reported long-term slow slip events. A period of strong correlation around the Kii Channel in 2000-2002 is attributed to a previously undocumented long-term slow slip event beneath the Kii Channel and the eastern part of Shikoku Island with an equivalent moment magnitude of 6.6. This detection method reveals variation among long-term slow slip events along the Nankai Trough.

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Section: Introductionmentioning

confidence: 87%

Section: Spatiotemporal Distribution Of Displacementsmentioning

confidence: 99%

Section: Detection Of Long-term Ssesmentioning

confidence: 99%

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Objective detection of long-term slow slip events along the Nankai Trough using GNSS data (1996–2016)

Kobayashi¹

2017

Earth Planets Space

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“…Western to central Shikoku slow slips occurred between 2004 and 2006 and between 2011 and 2013, following the Bungo slow slips (Takagi et al 2016). The Bungo slow slips (Hirose et al 1999) have occurred with a time interval of approximately 6 and 1-year duration (e.g., Ozawa et al 2013). The last Bungo event before the 2011 Tohoku earthquake occurred in 2010.…”

Section: Introductionmentioning

confidence: 99%

“…Data are from Yagi et al (1999) low-frequency earthquakes occur (see Fig. 1a) (Obara 2002), while long-term slow slip events, which last more than several months, occur in the shallower area of the transition zone up-dip of the low-frequency earthquake area (e.g., Hirose and Obara 2005;Ozawa et al 2013;Takagi et al 2016). In addition, Yarai and Ozawa (2013) showed that the afterslip and long-term slow slip events occur in a region deeper than the coseismic slip area in the Hyuga-nada region, southwest Japan.…”

Section: Introductionmentioning

confidence: 99%

Long-term slow slip events along the Nankai trough subduction zone after the 2011 Tohoku earthquake in Japan

Ozawa

2017

Earth Planets Space

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Possible shallow slow slip events in Hyuga‐nada, Nankai subduction zone, inferred from migration of very low frequency earthquakes

Asano

Obara

Matsuzawa

et al. 2015

Geophysical Research Letters

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We investigated the spatiotemporal evolution of a shallow very low frequency earthquake (sVLFE) swarm linked to the 2009/2010 long-term slow slip event (SSE) in the Bungo channel, southwestern Japan. Broadband seismograms were analyzed using a cross-correlation technique to detect sVLFEs having similar waveforms to template sVLFEs, and their relative locations were estimated. The sVLFEs exhibit clear migration over a distance of 150 km along the Nankai trough, similar to nonvolcanic tremors and deep very low frequency earthquakes (dVLFEs) accompanied by short-term SSEs on the downward extension of the seismogenic zone. This similarity between sVLFEs and dVLFEs suggests that SSEs occur in both deeper and shallower extensions of the seismogenic zone. The analyzed sVLFEs were likely caused by a shallow SSE that occurred from January to March 2010 following the initiation and acceleration of the long-term SSE. This temporal evolution may be caused by stress interaction between the shallow SSE and the long-term SSE.

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Spatial and temporal evolution of the long-term slow slip in the Bungo Channel, Japan

Cited by 55 publications

References 10 publications

Objective detection of long-term slow slip events along the Nankai Trough using GNSS data (1996–2016)

Objective detection of long-term slow slip events along the Nankai Trough using GNSS data (1996–2016)

Long-term slow slip events along the Nankai trough subduction zone after the 2011 Tohoku earthquake in Japan

Possible shallow slow slip events in Hyuga‐nada, Nankai subduction zone, inferred from migration of very low frequency earthquakes

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