A plea for more caution in fault–slip analysis

Kinematic analysis and palaeoseismology of the Edremit Fault Zone: evidence for past earthquakes in the southern branch of the North Anatolian Fault Zone, Biga Peninsula, NW Turkey

“…These overprinting relationships, together with cross-cutting relationships and stratigraphic information, were used to determine the various deformation phases and their succession in time. If no cross-cutting or overprinting relationships were encountered, the age of the host lithology and the similarity of the stress orientations/stress ratios to other sites were taken into account when the deformation phase was already precisely assigned (Hippolyte et al, 2012;Sperner & Zweigel, 2010). After processing fault-slip data, three different deformation phases can be separated, according to our results and the available kinematic data from the literature (Beccaletto & Steiner, 2005;Bonev et al, 2009).…”

“…Angelier, 1979Angelier, , 1994Armijo, Carey, & Cisternas, 1982;Marrett & Allmendinger, 1990;Will & Powell, 1991;Yamaji, 2000;Yin & Ranalli, 1993;Žalohar & Vrabec, 2007) were developed for the computer-based inversion of structural data. Because of the robustness in multistage deformed areas (see Angelier et al, 1981;Brahim et al, 2002;Hippolyte & Mann, 2011;Kaymakçı, White, & van Dijk, 2000;Sperner et al, 2003;Vandycke & Bergerat, 2001), we used the Direct Inversion Method (INVD) of Angelier (1990) in this study; however, we refer to Angelier (1994) for a detailed review of the method and to Sperner and Zweigel (2010) and Hippolyte, Bergerat, Gordon, Bellier, and Espurt (2012) for data acquisition and separation techniques. Briefly, the INVD is based on the reduced stress tensor concept and the estimation of the stress ellipsoid by the shape factor (Φ), which varies between 0 and 1.…”

The Missing Soft Link? Evidence for Marginal Fault Interaction at the Southern Margin of Geraneia Mountains, Central Greece

“…along a N-S transect) which hinders the recognition of faults highly oblique or parallel to the exposed roadcut. In our case, according to the conclusions of Sperner and Zweigel (2010), NDA produces reasonable results, albeit with low confidence in the computed stress ratio R. All calculations were made through the in TectonicsFP v.1.7.8 software package (Reiter and Acs, 2015).…”

“…The analysis of data followed the guidelines suggested by Sperner and Zweigel (2010) and the homogeneity of the fault dataset was first ensured before embarking into any further calculations. We chose two methods for fault-slip analysis, namely Angelier and Cocquel's (1979) right-dihedra method (RDM) and Numerical Dynamic Analysis (NDA), based on Spang's (1972) original method.…”

The recent fault kinematics in the westernmost part of the Getic nappe system (Eastern Serbia): Evidence from fault slip and focal mechanism data

“…It involved applying the lowest quality rank criteria among the following ones: the total number of initial data-sets considered for calculations, the percentage of used data-sets in the final calculation against the total number of data, confidence rank based on field observations, fluctuation angle between the calculated slip and the slip observed on the outcrop, and the confidence rank related to the type of the slip indicator used to determine the sense of shear in the field (see Table 1). The overall quality of each result of stress tensor inversion was assigned (Sperner & Zweigel 2010).…”