The 2008 Yutian normal faulting earthquake (Mw 7.1), NW Tibet: Non-planar fault modeling and implications for the Karakax Fault

Furuya, Masato; Yasuda, Takatoshi

doi:10.1016/j.tecto.2011.09.003

Cited by 49 publications

(35 citation statements)

References 47 publications

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“…Intersections of the fault segments with surface of the Earth were inferred from the sharp displacement discontinuities in the CSK and TSX pixel tracking data, indicating surface ruptures of the fault above the dike. The dip angle of the graben‐bounding faults was determined for each segment by a trial‐and‐error approach to minimize the root‐mean‐square error (RMSE) and plausible opening/slip distributions (e.g., Furuya & Yasuda, ).…”

Section: Elastic Modelingmentioning

confidence: 99%

Icecap and Subglacial Crustal Deformation Inferred From SAR Pixel Tracking: The 2014 Dike Intrusion Episode in the Bárðarbunga Volcanic System, Iceland

2019

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Bárðarbunga is an active volcano beneath the Vatnajökull icecap in Iceland, where a subglacial dike intrusion occurred in 2014. This area has been studied with interferometric synthetic aperture radar, an important geodetic method that measures crustal deformation; however, ice/snow cover on volcanoes impedes the mapping of crustal deformation because of decorrelation problems. Previous geodetic observations have reported deformation signals at ice‐free regions of a major dike formed in 2014 in the Bárðarbunga volcanic system, but direct observations of the subglacial crustal deformation associated with the dike intrusion have been limited. We applied a pixel tracking approach to various satellite synthetic aperture radar (SAR) data over the northern part of the Vatnajokull icecap and the Holuhraun plain. The pixel tracking data revealed not only crustal deformation fields in the ice‐free region of the magma intrusion, which covers only about 20% of the entire length of dike, but also icecap surface movements over the subglacial part of the dike in the ablation area of the Vatnajökull icecap. Signals above the icecap, suggesting subsidence due to subglacial graben formation, are consistent with the dike propagation path inferred from seismicity during the episode. By subtracting the scaled pre‐diking signals from the co‐diking signals, we corrected for the steady‐state icecap flow signals to derive the subglacial crustal deformations. We showed that the inferred subglacial crustal deformation signals can significantly contribute to the improvement of dike opening/faulting distributions. Applying the pixel tracking to satellite images will enable mapping subglacial crustal deformation in the case of subglacial volcanic activity.

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Section: Elastic Modelingmentioning

confidence: 99%

Icecap and Subglacial Crustal Deformation Inferred From SAR Pixel Tracking: The 2014 Dike Intrusion Episode in the Bárðarbunga Volcanic System, Iceland

2019

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“…Okada's (1992) solutions, however, express the displacements due to a rectangular dislocation element, and thus can generate either mechanically incompatible gaps, overlaps, or both when the actual dislocation sources have non-planar geometries (Maerten et al 2005;Furuya and Yasuda 2011;Abe et al 2013). Therefore, we used Meade's (2007) analytical solutions for a triangular dislocation element to estimate the fault slip from the observed ground displacements.…”

Section: Ii) Fault Source Modeling: Methods and Resultsmentioning

confidence: 99%

“…To reduce the data size, quad-tree decomposition was used (e.g., Jónsson et al 2002;Lohman and Simons 2005). We also applied both a smoothness constraint on the slip distributions with a scale-dependent umbrella operator (Maerten et al 2005) and a non-negativity constraint on the signs of the fault slip directions (Furuya and Yasuda 2011;Abe et al 2013). Based on the focal mechanism solutions (Fig.…”

Section: Ii) Fault Source Modeling: Methods and Resultsmentioning

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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“…Earthquakes with M ≥ 5.0 are Figure 17 indicates that moderate-sized (Mw 5.5-7.0) normal faulting earthquakes are common in the Tibetan Plateau. For instance, the 2008 Yutian earthquake in the northwest part of the plateau [41,42] was the largest normal faulting earthquake ever recorded instrumentally in northern Tibet. Elliott et al [41] studied a series of eight Mw 5.9-7.1 normal faulting earthquakes and inferred that the extension of the Tibetan Plateau is driven primarily by gravitational forces.…”

Section: Discussionmentioning

confidence: 99%

Source Parameters of the 2003–2004 Bange Earthquake Sequence, Central Tibet, China, Estimated from InSAR Data

Zhao

et al. 2016

Remote Sensing

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A sequence of Ms ě 5.0 earthquakes occurred in 2003 and 2004 in Bange County, Tibet, China, all with similar depths and focal mechanisms. However, the source parameters, kinematics and relationships between these earthquakes are poorly known because of their moderately-sized magnitude and the sparse distribution of seismic stations in the region. We utilize interferometric synthetic aperture radar (InSAR) data from the European Space Agency's Envisat satellite to determine the location, fault geometry and slip distribution of three large events of the sequence that occurred on 7

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The 2008 Yutian normal faulting earthquake (Mw 7.1), NW Tibet: Non-planar fault modeling and implications for the Karakax Fault

Cited by 49 publications

References 47 publications

Icecap and Subglacial Crustal Deformation Inferred From SAR Pixel Tracking: The 2014 Dike Intrusion Episode in the Bárðarbunga Volcanic System, Iceland

Icecap and Subglacial Crustal Deformation Inferred From SAR Pixel Tracking: The 2014 Dike Intrusion Episode in the Bárðarbunga Volcanic System, Iceland

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

Source Parameters of the 2003–2004 Bange Earthquake Sequence, Central Tibet, China, Estimated from InSAR Data

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