| Title | Source parameters of the 2017 Mw 6.2 Yukon earthquake doublet inferred from coseismic GPS and ALOS-2 deformation measurements |
| Author | Feng, W; Samsonov, S; Liang, C; Li, J; Charbonneau, F; Yu, C; Li, Z |
| Source | Geophysical Journal International vol. 216, issue 3, 2018 p. 1517-1528, https://doi.org/10.1093/gji/ggy497 (Open Access) |
| Year | 2018 |
| Alt Series | Natural Resources Canada, Contribution Series 20180430 |
| Publisher | Oxford University Press (OUP) |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Province | Yukon; British Columbia |
| NTS | 104M/04; 104M/05; 104M/12; 104M/13; 105D/04; 105D/05; 114P/01; 114P/02; 114P/03; 114P/06; 114P/07; 114P/08; 114P/09; 114P/10; 114P/11; 114P/14; 114P/15; 114P/16; 115A/01; 115A/02; 115A/03; 115A/06; 115A/07;
115A/08 |
| Area | Whitehorse; Alaska; Yakutat; Canada; United States of America |
| Lat/Long WENS | -137.5000 -135.5000 60.5000 59.0000 |
| Subjects | geophysics; tectonics; satellite geodesy; remote sensing; satellite imagery; radar methods; earthquakes; earthquake mechanisms; tectonic setting; crustal movements; deformation; software; modelling;
bedrock geology; structural features; faults; stress analyses; 2017 Mw 6.2 Yukon Earthquake; Denali Fault; Duke River Fault; North American Plate; Pacific Plate; Yakutat Terrane; geological hazards; global positioning systems; ALOS-2; InSAR;
interferometric synthetic aperture radar; data processing; ionosphere correction; joint inversion; geological mapping techniques |
| Illustrations | geoscientific sketch maps; tables; satellite images; focal mechanisms; profiles |
| Released | 2018 11 22 |
| Abstract | We investigated an Mw ? 6.2 earthquake doublet on the border of the USA and Canada using ALOS2 Light-of-Sight displacements and GPS measurements. We selected three L-band ALOS-2 interferograms with
temporal baselines of one yr to extract coseismic deformation maps, in which master and slave images were both acquired in July. A subpixel-based alignment and another range spectral splitting techniques under the GAMMA InSAR software framework were
applied to improve the interferometric coherence and reduce the effects of phase anomalies in two of the three interferometric pairs due to either ionospheric delay or a potential focusing issues in the generation of the ALOS2 SLC data. The updated
interferograms convincingly reveal deformation fringe patterns produced by the two earthquakes. We conducted a nonlinear geophysical inversion to estimate the geometric parameters of the earthquakes with the InSAR and GPS measurements. The
best-fitting model shows that a thrust faulting on a reverse fault and left-lateral strike-slip faulting on a nearly vertical fault with the centroid depths of 9.3±0.6 and 8.4±0.7 km, respectively, are most likely responsible for the earthquake
doublet. The eastern Denali fault (EDF) and Duke River fault are major active faults in the region and the earthquake doublet could be due to reactivation of the part of the two faults system. |
| GEOSCAN ID | 314521 |
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