Episodic growth of fault‐related fold in northern Japan observed by SAR interferometry

Nishimura, Takuya; Tobita, Mikio; Yarai, Hiroshi; Amagai, Tomomi; Fujiwara, Midori; Une, Hiroshi; Koarai, Mamoru

doi:10.1029/2008gl034337

Cited by 28 publications

(18 citation statements)

References 18 publications

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“…3(b)). The Geographical Survey Institute of Japan (GSI) found that the anticline was located in the area compressed by the earthquake and proposed that it was uplifted by the compression (Nishimura et al, 2008). Similar fold deformation associated with an earthquake was also found at the earthquake site in southeast Iran (Fielding et al, 2004), and it would relate to the growth of a fold.…”

Section: Crustal Deformation Obtained By Palsar Insarmentioning

confidence: 90%

Coseismic deformation of the 2007 Chuetsu-oki earthquake derived from PALSAR/InSAR and its fault model

Ozawa

2008

Earth Planet Sp

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The 2007 Chuetsu-oki earthquake (M j 6.8) occurred offshore of Niigata Prefecture, northeast Japan, on 16 July 2007. I applied PALSAR/InSAR to detect coseismic deformation associated with the earthquake. The interferogram generated from descending data revealed a slant-range shortening exceeding 20 cm in the coastal area of Kashiwazaki adjacent to the epicenter and a maximum slant range extension of approximately 15 cm southeast of the slant-range shortening pattern. The interferogram generated from descending data is consistent with GPS displacements, but the non-crustal deformation component was large in the interferogram generated from ascending data. Based on a fault plane dipping to the southeast, a fault-slip distribution was estimated from the descending interferogram and GPS displacements. The largest fault-slip was located in the southwestern deeper part of the mainshock hypocenter. In the northern part of the focal region, the fault-slip was dominant at depths of 5-15 km, but it was limited to shallower depths in the southern part of the focal region. Such fault-slip distribution is consistent with the aftershock distribution. This consistency supports the assumption that the fault rupture in the mainshock has primarily occurred in the nodal plane dipping to the southeast.

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Section: Crustal Deformation Obtained By Palsar Insarmentioning

confidence: 90%

Coseismic deformation of the 2007 Chuetsu-oki earthquake derived from PALSAR/InSAR and its fault model

Ozawa

2008

Earth Planet Sp

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“…2d), has in some cases been found to be associated with creep along shallow faults, caused by changes in the local stress field due to co-seismic slip on adjacent faults (Nishimura et al 2008;Copley & Reynolds 2014;Fattahi et al 2015;Copley & Jolivet 2016). The InSAR observations at Bam indicate that parts of the Bam-Baravat Fault began creeping after the 2003 earthquake (see Fig.…”

Section: G Ro W T H O F T H E B a M -B A R Avat R I D G E A N D L I Tmentioning

confidence: 99%

Fault mechanics and post-seismic deformation at Bam, SE Iran

Wimpenny¹,

Copley²,

Ingleby

2017

Geophysical Journal International

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S U M M A R YThe extent to which aseismic deformation relaxes co-seismic stress changes on a fault zone is fundamental to assessing the future seismic hazard following any earthquake, and in understanding the mechanical behaviour of faults. Here we use models of stress-driven afterslip and viscoelastic relaxation, in conjunction with post-seismic InSAR measurements, to show that there has been minimal release of co-seismic stress changes through post-seismic deformation following the 2003 M w 6.6 Bam earthquake. Our analysis indicates the faults at Bam remain predominantly locked, suggesting that the co-plus interseismically accumulated elastic strain stored downdip of the 2003 rupture patch may be released in a future M w 6 earthquake. Our observations and models also provide an opportunity to probe the growth of topography at Bam. We find that, for our modelled afterslip distribution to be consistent with forming the sharp step in the local topography over repeated earthquake cycles, and also to be consistent with the geodetic observations, requires either (1) far-field tectonic loading equivalent to a 2-10 MPa deviatoric stress acting across the fault system, which suggests it supports stresses 60-100 times less than classical views of static fault strength, or (2) that the fault surface has some form of mechanical anisotropy, potentially related to corrugations on the fault plane, that controls the sense of slip.

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“…However, Fujiwara et al (2000a, b), Fukushima et al (2013), Guerrieri et al (2010), Nishimura et al (2008) and Wei et al (2011) reported that lineaments representing small displacements appear on interferograms, and Oskin et al (2012) reported that small displacements appear in differential LiDAR images.…”

Section: Introductionmentioning

confidence: 99%

Small-displacement linear surface ruptures of the 2016 Kumamoto earthquake sequence detected by ALOS-2 SAR interferometry

Fujiwara

Yarai

Kobayashi

et al. 2016

Earth Planets Space

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107

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We constructed and analyzed the ground surface displacement associated with the 2016 Kumamoto earthquake sequence using satellite radar interferometry images of the Advanced Land Observing Satellite 2. The radar interferogram generally shows elastic deformation caused by the main earthquakes, but many other linear discontinuities showing displacement are also found. Approximately 230 lineaments are identified, some of which coincide with the positions of known active faults, such as the main earthquake faults belonging to the Futagawa and Hinagu fault zones and other minor faults; however, there are much fewer known active faults than lineaments. In each area, the lineaments have a similar direction and displacement to each other; therefore, they can be divided into several groups based on location and major features. Since the direction of the lineaments coincides with that of known active faults or their conjugate faults, the cause of the lineaments must be related to the tectonic stress field of this region. The lineaments are classified into the following two categories: (1) main earthquake faults and their branched subfaults and (2) secondary faults that are not directly related to the main earthquake but whose slip was probably triggered by the main earthquake or aftershocks.

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Episodic growth of fault‐related fold in northern Japan observed by SAR interferometry

Cited by 28 publications

References 18 publications

Coseismic deformation of the 2007 Chuetsu-oki earthquake derived from PALSAR/InSAR and its fault model

Coseismic deformation of the 2007 Chuetsu-oki earthquake derived from PALSAR/InSAR and its fault model

Fault mechanics and post-seismic deformation at Bam, SE Iran

Small-displacement linear surface ruptures of the 2016 Kumamoto earthquake sequence detected by ALOS-2 SAR interferometry

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