Coseismic and early postseismic slip for the 2003 Tokachi‐oki earthquake sequence inferred from GPS data

Miyazaki, S.; Larson, Kristine M.

doi:10.1029/2007gl032309

Cited by 55 publications

(66 citation statements)

References 26 publications

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“…The moment magnitude of the transient is M w ∼ 7.0, but this may be a slight overestimate due to the spatial smoothing inherent in the NSF. The concentration of the transient afterslip in a region downdip of the foreshock's epicenter and peak-slip region is similar to previous observations for the 1994 Sanriku Haruka-oki earthquake (Yagi et al, 2003) which was located just north of the 2011 Tohoku earthquake, and the 2003 Tokachi-oki earthquake (e.g., Miyazaki and Larson, 2008) located further north on the Kurile Trench. Since the maximum of the transient slip distribution is found to be close to the USGS epicenter for the 2011 Tohoku earthquake, it is possible that the foreshock's afterslip promoted the initiation of the mainshock's rupture.…”

Section: Finite Fault Slip Inversionsupporting

confidence: 77%

Seismic and aseismic fault slip before and during the 2011 off the Pacific coast of Tohoku Earthquake

2011

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The March 11, 2011, off the Pacific coast of Tohoku Earthquake is the first great subduction zone earthquake to be recorded by a dense, modern network of geodetic quality Global Positioning System (GPS) receivers, and hence presents an unprecedented opportunity to study the evolution of fault slip during the time periods immediately before, during, and after a truly great earthquake. We utilized sub-daily GPS data to constrain the slip distribution in the March 9 M w 7.3 foreshock, the 50-hour time period between the foreshock, and the coseismic slip during the M w 9.0 mainshock. We find that the foreshock ruptured downdip from its hypocenter, that there was considerable (M w ∼ 7.3) slip during the 50 hours between the foreshock and the mainshock, and that the peak mainshock slip was about 35 m. The mainshock's epicenter may have been triggered by afterslip that followed the foreshock. Additionally, the mainshock slip distribution was centered further updip than the peak interseismic coupling estimated from GPS data in the ten years before the earthquake.

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Section: Finite Fault Slip Inversionsupporting

confidence: 77%

Seismic and aseismic fault slip before and during the 2011 off the Pacific coast of Tohoku Earthquake

2011

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“…In this study, I have demonstrated that EOF analysis is a powerful tool for enhancing the signal-to-noise ratio of GPS kinematic time series to extract meaningful deformations at the GPS stations. Network Information Filter (NIF) (Segall and Matthews, 1997) can also be used for that purpose, and Miyazaki and Larson (2008) applied it to GPS kinematic time series to infer detailed coseismic slip and subsequent afterslip at the plate boundary. EOF filtering, as used in this study, offers an easy and efficient alternative method to evaluate meaningful slips using GPS kinematic time series that contain large noise.…”

Section: Discussionmentioning

confidence: 99%

“…For this purpose, GPS kinematic time series are useful. Miyazaki and Larson (2008) fully used the GPS kinematic time series from the Japanese nationwide GPS network (GEONET) to study the 2003 Tokachi-oki earthquake sequence: One of their results was that the afterslip between the mainshock and the M 7.4 aftershock occurred in a region to the southwest of the mainshock, which possibly triggered the aftershock in the southwest. However, identifying the deformation caused by each earthquake and afterslip in the case of the 2011 Tohoku-oki earthquake sequence is a challenging task since the aftershocks and afterslips occurred in a very short time interval after the mainshock.…”

Section: Introductionmentioning

confidence: 99%

Coseismic and early postseismic slips associated with the 2011 off the Pacific coast of Tohoku Earthquake sequence: EOF analysis of GPS kinematic time series

Munekane

2012

Earth Planet Sp

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GPS kinematic time series are analyzed to estimate slip distributions for the M w 9.0 2011 off the Pacific coast of Tohoku Earthquake sequence. Empirical orthogonal function (EOF) analysis is employed to enhance the signal-to-noise ratio of the original time series. The coseismic, and subsequent postseismic, deformations of the foreshock can be described by a single mode, suggesting that the extent of the source for both events must be similar. The total moment magnitude of the afterslip following the foreshock is estimated to be M w 7.1 with a decay time of 0.63 days. The magnitude of the afterslip was larger for its duration than was anticipated by the scaling law for a typical slow earthquake, although two previous earthquakes in adjacent regions showed the same tendency as that in the present case. The pattern of slip of the mainshock and the subsequent afterslips and aftershocks indicates that each slip occurs in a region adjacent to that of the previous slips in a complementary manner. Finally, in the course of the EOF analysis, the modes representing the thermal expansion of the GPS pillars are clearly identified.

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“…The static offsets for both the mainshock and aftershock can be used to provide cumulative slip constraints on rupture models (Wald and Graves, 2001). Updated cumulative slip models based on these estimates are available in Miyazaki and Larson (2008).…”

Section: Horizmentioning

confidence: 99%

Resolving static offsets from high-rate GPS data: the 2003 Tokachi-oki earthquake

Larson

Miyazaki

2008

Earth Planet Sp

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The M w 8.0 2003 Tokachi-oki earthquake offshore Hokkaido is the largest earthquake observed to date by a dense GPS network (GEONET). These GPS data are important both for resolving the geodetic signature of the earthquake itself and studies of postseismic deformation. Because GPS positions are generally estimated by averaging 24 hours of observations, it can be difficult to separate the effects of the earthquake and early postseismic deformation. In order to address this difficulty, a Kalman filtering methodology is developed that allows the estimation of the static offsets for the mainshock, its largest aftershock, and postseismic deformation in the first 24 hours. The static offsets computed for this study can be used for earthquake rupture studies while the early postseismic data can be used to evaluate frictional properties of the fault.

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Coseismic and early postseismic slip for the 2003 Tokachi‐oki earthquake sequence inferred from GPS data

Cited by 55 publications

References 26 publications

Seismic and aseismic fault slip before and during the 2011 off the Pacific coast of Tohoku Earthquake

Seismic and aseismic fault slip before and during the 2011 off the Pacific coast of Tohoku Earthquake

Coseismic and early postseismic slips associated with the 2011 off the Pacific coast of Tohoku Earthquake sequence: EOF analysis of GPS kinematic time series

Resolving static offsets from high-rate GPS data: the 2003 Tokachi-oki earthquake

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