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Fig. 10 | Swiss Journal of Geosciences

Fig. 10

From: The Saint-Ursanne earthquakes of 2000 revisited: evidence for active shallow thrust-faulting in the Jura fold-and-thrust belt

Fig. 10

First-motion focal mechanisms solutions for the ML 3.2 event of April 6th, 2000 based on a take-off angles calculated routinely with NonLinLoc (NLL) and the 3-D model of Husen et al. (2003); b take-off angles based on 2-D ray-trace models for focal depths in the basement (2 km); c and in the sediments (1 km); here with different lines styles and colors are indicated those nodal plane solutions for which an equally good fit is obtained. d take-off angles calculated with NonLinLoc, the new 3-D Pg + Sg model (Diehl et al., 2021) and a focal depth of 0.7 km BSL. Stereogram is lower hemisphere, equal-area projection. Solid circles correspond to compressive first motion (up); empty circles correspond to dilatational first motion (down). Grey lines in d) show sets of acceptable solutions derived by the HASH algorithm (Hardebeck & Shearer, 2002); black bold lines indicate the (preferred) average focal mechanism of all accepted solutions. For all cases, strike, dip, and rake of the two focal planes are provided below each mechanism

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