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Official Journal of the Asia Oceania Geosciences Society (AOGS)

Fig. 2 | Geoscience Letters

Fig. 2

From: GPS-based slip models of one Mw 7.2 and twenty moderate earthquakes along the Sumatran plate boundary

Fig. 2

Grid-search results for (a) the 26 February 2005 Mw 6.7 Simeulue event and (b) the 5 July 2005 Mw 6.6 Nias event with contours showing the error-weighted variance explained (ve) of numerous forward models. Black boxes outline the surface projection of the preferred rupture plane. Red circles are the SuGAr stations that had been installed before the event, while white circles are those installed after the event or decommissioned before the event. Green and red vectors represent the observed vertical and horizontal displacements, while black vectors represent the displacements predicted from our preferred model. Yellow stars, orange triangles, blue diamonds, and red inverted triangles represent the epicenters from the ANSS, ISC, ISC-EHB, and ISC-GEM teleseismic catalogs, respectively. Focal mechanisms are placed at the gCMT centroid locations (Dziewonski et al. 1981; Ekström et al. 2012). Both events have three local maxima in their contours. The global maximum for the Simeulue event is the closest to the teleseismic locations; thus, the global maximum is chosen as the preferred model. However, the global maximum near LHWA for the Nias event is only the second closest to the teleseismic locations; thus, the local maximum closest to the teleseismic locations is chosen as the preferred model. Brown lines are slab contours at 20 km, 40 km, and 60 km intervals from Slab1.0 (Hayes et al. 2012)

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