Surface deformations from moderate-sized earthquakes in Mongolia observed by InSAR

Amarjargal, Sh.; Kato, Teruyuki; Furuya, Masato

doi:10.5047/eps.2012.12.015

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…White stars mean the epicenter of the 1833 Mw 7.6 event, in which A and S stand for the locations determined by Ambraseys and Douglas (2004) and Szeliga et al (2010), respectively. Locations of historical large earthquakes along the Himalayan arc (Avouac 2007) are shown in an inset Amarjargal et al 2013). The capability enables us to capture the whole picture of the crustal deformation even in mountainous areas.…”

Section: Introductionmentioning

confidence: 99%

Detailed crustal deformation and fault rupture of the 2015 Gorkha earthquake, Nepal, revealed from ScanSAR-based interferograms of ALOS-2

Kobayashi

Morishita

Yarai

2015

Earth Planets Space

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We have successfully detected widely distributed ground displacements for the 2015 Gorkha earthquake by applying a ScanSAR-based interferometry analysis of Advanced Land Observing Satellite 2 (ALOS-2) L-band data. A major displacement area extends with a length of about 160 km in the east-west direction, and the most concentrated crustal deformation with ground displacement exceeding 1 m is located 20-30 km east from Kathmandu. A quasi-vertical displacement estimated by combining the ascending and the descending data indicates upheaval of about 1.4 m at maximum. We inverted the synthetic aperture radar interferometry (InSAR) data including both of the main shock (moment magnitude (Mw) 7.8) and the largest aftershock (Mw 7.3) to construct a slip distribution model. Our model shows a nearly pure reverse fault motion with a slip amount of approximately 6 m at maximum, and the spatial extent is zonally distributed within a distance of 50 to 100 km from the surface along downdip direction. The downdip end of the slip is quite consistent with that of the interseismic coupling area geodetically inferred in previous studies. On the other hand, there is no significant slip at shallow depth in spite of the fact that the plate interface is thought to be fully locked there, may be suggesting that there still remains a potential of fault slip. The slip distribution unnaturally bifurcates in the east, and we can identify a clear-cut slip deficit area with a radius of~10 km just west side of the Mw 7.3 event, where the slip amount reaches only 20 cm at most. This area is presumably subjected to a strong shear stress which should promote a reverse fault slip. There is a possibility to produce a fault slip equivalent to Mw~7.0 in the future although we do not know if the slip heterogeneity would be smoothed out by a seismic event or an aseismic event.

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Section: Introductionmentioning

confidence: 99%

Detailed crustal deformation and fault rupture of the 2015 Gorkha earthquake, Nepal, revealed from ScanSAR-based interferograms of ALOS-2

Kobayashi

Morishita

Yarai

2015

Earth Planets Space

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“…Some studies inquired the subsidence of ground [4]. The range of ground is various such as urban area to rural and landslide, earthquake sites [4], [7][8][9]. Its accuracy is determined by coherence.…”

Section: Of 10mentioning

confidence: 99%

A Study on Optimal D-InSAR Filtering Technique According to Landform Relief

Youm¹,

Hongsic²,

Kwangbae³

et al. 2017

Preprint

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Abstract:The InSAR technique measures the displacement of an indicator using SAR image interference. The technique of interfering two SAR images among InSAR techniques is called Differential InSAR (D-InSAR). In the process of D-InSAR, the filtering technique is used in the Unwrapped Mask, usually using the GoldStein method. However, since the Goldstein method removes the noise on the path, it is difficult to derive the displacement value in the agricultural area where the relative coherence is low. In Korea, more than 50% of the whole country consists of mountainous regions and agricultural regions, so it is difficult to use the Goldstein technique polysynthetically. In this study, we set the test-bed for the urban area and the agricultural area based on Coherence, and introduce Goldstein and Boxcar Filter, one of the Goldstein and LSM techniques. Through this process, we want to draw the conclusion which is displacement values in the agricultural area.

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“…In order to identify the location and geometry of the source faults, however, co-seismic deformation signals derived from the interferometric synthetic aperture radar (InSAR) technique are much more useful because of the dense and wide spatial coverage (Massonnet et al 1993;Amarjargal et al 2013). Using C-band (5.6 cm wavelength) Environmental Satellite (ENVISAT) Advanced Synthetic Aperture Radar (ASAR) images, Pinel-Puysségur (Kazmi 1979;Nakata et al 1991), dashed lines are fault traces based on morphology (Pinel-Puysségur et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Complex faulting in the Quetta Syntaxis: fault source modeling of the October 28, 2008 earthquake sequence in Baluchistan, Pakistan, based on ALOS/PALSAR InSAR data

Usman

Furuya

2015

Earth Planet Sp

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The Quetta Syntaxis in western Baluchistan, Pakistan, is the result of an oroclinal bend of the western mountain belt and serves as a junction for different faults. As this area also lies close to the left-lateral strike-slip Chaman fault, which marks the boundary between the Indian and Eurasian plates, the resulting seismological behavior of this regime is very complex. In the region of the Quetta Syntaxis, close to the fold and thrust belt of the Sulaiman and Kirthar Ranges, an earthquake with a magnitude of 6.4 (Mw) occurred on October 28, 2008, which was followed by a doublet on the very next day. Six more shocks associated with these major events then occurred (one foreshock and five aftershocks), with moment magnitudes greater than 4. Numerous researchers have tried to explain the source of this sequence based on seismological, GPS, and Environmental Satellite (ENVISAT)/Advanced Synthetic Aperture Radar (ASAR) data. Here, we used Advanced Land Observing Satellite (ALOS)/Phased Array-type L-band Synthetic Aperture Radar (PALSAR) InSAR data sets from both ascending and descending orbits that allow us to more completely detect the deformation signals around the epicentral region. The results indicated that the shock sequence can be explained by two right-lateral and two left-lateral strike-slip faults that also included reverse slip. The right-lateral faults have a curved geometry. Moreover, whereas previous studies have explained the aftershock crustal deformation with a different fault source, we found that the same left-lateral segment of the conjugate fault was responsible for the aftershocks. We thus confirmed the complex surface deformation signals from the moderate-sized earthquake. Intra-plate crustal bending and shortening often seem to be accommodated as conjugate faulting, without any single preferred fault orientation. We also detected two possible landslide areas along with the crustal deformation pattern.

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Surface deformations from moderate-sized earthquakes in Mongolia observed by InSAR

Cited by 6 publications

References 34 publications

Detailed crustal deformation and fault rupture of the 2015 Gorkha earthquake, Nepal, revealed from ScanSAR-based interferograms of ALOS-2

Detailed crustal deformation and fault rupture of the 2015 Gorkha earthquake, Nepal, revealed from ScanSAR-based interferograms of ALOS-2

A Study on Optimal D-InSAR Filtering Technique According to Landform Relief

Complex faulting in the Quetta Syntaxis: fault source modeling of the October 28, 2008 earthquake sequence in Baluchistan, Pakistan, based on ALOS/PALSAR InSAR data

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