Persistent inelastic deformation in central Japan revealed by GPS observation before and after the Tohoku-oki earthquake

Meneses-Gutierrez, Angela; Sagiya, Takeshi

doi:10.1016/j.epsl.2016.06.055

Cited by 28 publications

(24 citation statements)

References 25 publications

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“…In this study, we aim to characterize localized elastic and inelastic deformation in the Mid‐Niigata region utilizing the preseismic, coseismic, and postseismic deformation of the 2011 Tohoku‐oki earthquake. We show that crustal deformation concentrates within a horizontal width of 50–60 km in the Niigata region and the deformation pattern reflects at least two different processes, the persistent deformation in the form of aseismic slip, in agreement with Meneses‐Gutierrez and Sagiya (), and heterogeneous elastic deformation due to an elastically weak region, in agreement with the location of thick soft sediments of the Echigo Plain (Figure ).…”

Section: Introductionsupporting

confidence: 85%

“…On the other hand, strain or strain rate components are independent of the reference frame. In our previous study, we demonstrate an effective decomposition of the geodetic strain rate patterns in central Japan according to their wavelength (Meneses‐Gutierrez & Sagiya, ). Thus, we rely on similar approach employing strain distributions in this study.…”

Section: Gps Datamentioning

confidence: 96%

“…Different spatial scales characterized deformation of the Japanese island (Meneses‐Gutierrez & Sagiya, ). GPS displacement or displacement rate vectors represent crustal movements directly.…”

Section: Gps Datamentioning

confidence: 99%

“…They found a larger E‐W extension in this area than expected from a uniform elastic half‐space model, indicating a smaller stiffness of the crust in this area, which agrees with the presence of thick soft sediments. On the other hand, Meneses‐Gutierrez and Sagiya () utilized the mechanical responses of NKTZ to enforced deformation before and after the 2011 Mw9.0 Tohoku‐oki earthquake to constrain the mechanism of localized deformation in the NKTZ. By analyzing strain rate distributions based on GPS daily coordinates from Global Navigation Satellite Systems (GNSS) Earth Observation Network System (GEONET) in central Japan before and after the event, they found persistent localized contraction (4–10 × 10 −8 /year) in northern NKTZ, demonstrating significance of inelastic processes in crustal deformation of inland Japan and providing a solution to the long‐lasting controversy between geodetic and geological strain rates in the area.…”

Section: Introductionmentioning

confidence: 99%

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Crustal Deformation Process in the Mid‐Niigata Region of the Niigata‐Kobe Tectonic Zone as Observed by Dense GPS Network Before, During, and After the Tohoku‐Oki Earthquake

2018

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We evaluate response of Mid‐Niigata during the preseismic, coseismic, and postseismic periods of the 2011 Mw9.0 Tohoku‐oki earthquake by analyzing strain distributions based on a dense Global Positioning System network. Decomposition of the coseismic E‐W strain according to its wavelength shows localized elastic extension, while persistent localized contraction in the short‐wavelength component within a narrow zone of 40‐ to 60‐km width is significant before and after the event, implying the persistence of an inelastic process. Differences in the amplitude and horizontal location of the localized deformation suggest that elastic heterogeneities of the crust, acting in different sense before and after the earthquake, affect the deformation in Mid‐Niigata as well. We model localized deformation in the preseismic and postseismic period considering an aseismic fault slip and a weak elastic zone as deformation sources. Our kinematic models suggest vertical decoupling between the weak elastic layer and the basement rock, implying that the preseismic and postseismic strain rate patterns represent direct effects of the shallow portion of the crust in Mid‐Niigata. Although model parameters are not well constrained, we find that faults cutting the lower crust and a part of the upper crust, and an anomalously weak zone of a 40‐ to 60‐km width located above the fault explain the data. Our simple model shows that both inelastic and elastic sources are essential in the deformation mechanism of the Mid‐Niigata area in northern Niigata‐Kobe Tectonic Zone.

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Section: Introductionsupporting

confidence: 85%

Section: Gps Datamentioning

confidence: 96%

Section: Gps Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crustal Deformation Process in the Mid‐Niigata Region of the Niigata‐Kobe Tectonic Zone as Observed by Dense GPS Network Before, During, and After the Tohoku‐Oki Earthquake

2018

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“…1). Meneses-Gutierrez and Sagiya (2016) further reported that inelastic strain processes are responsible for strain concentration along the NKTZ from GNSS-derived strain rates. Thus, interseismic deformation fields provide ways to understand the subsurface rheological heterogeneities beneath the Japan arc.…”

Section: Introductionmentioning

confidence: 99%

Interseismic crustal deformation in and around the Atotsugawa fault system, central Japan, detected by InSAR and GNSS

Takada

Sagiya

Nishimura

2018

Earth Planets Space

Self Cite

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The Atotsugawa fault system is one of the best-known active faults in Japan. However, revealing the interseismic velocity field in and around the Atotsugawa fault system with high spatial resolution is challenging because of dense vegetation, steep topography, and heavy snowfall in winter. To overcome these difficulties, we combined ALOS/ PALSAR data and GNSS data from our original stations in addition to the nationwide station network (GEONET). First, we removed the height-dependent phase change in each interferogram using a digital elevation model. Next, we removed the long-wavelength phase trend using the GNSS velocity field. Finally, we applied an InSAR time-series analysis, known as small baseline subset analysis (SBAS), to all the corrected interferograms. The resultant mean velocity field shows a remarkable phase gradient around the Atostugawa fault system. We found a sharp velocity gradient across the Ushikubi fault, a major strand of the Atotsugawa faults system, rather than the main trace of the Atotsugawa fault. Using InSAR, we found that the interseismic deformation inside the strain concentration zone is spatially heterogeneous and different from what we expect from the fault traces.

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Present-day crustal deformation revealed active tectonics in Yogyakarta, Indonesia inferred from GPS observations

Widjajanti

Pratama

Parseno

et al. 2020

Geodesy and Geodynamics

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Persistent inelastic deformation in central Japan revealed by GPS observation before and after the Tohoku-oki earthquake

Cited by 28 publications

References 25 publications

Crustal Deformation Process in the Mid‐Niigata Region of the Niigata‐Kobe Tectonic Zone as Observed by Dense GPS Network Before, During, and After the Tohoku‐Oki Earthquake

Crustal Deformation Process in the Mid‐Niigata Region of the Niigata‐Kobe Tectonic Zone as Observed by Dense GPS Network Before, During, and After the Tohoku‐Oki Earthquake

Interseismic crustal deformation in and around the Atotsugawa fault system, central Japan, detected by InSAR and GNSS

Present-day crustal deformation revealed active tectonics in Yogyakarta, Indonesia inferred from GPS observations

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