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Fig. 1 | Swiss Journal of Geosciences

Fig. 1

From: 3D crustal structure of the northwest Alborz region (Iran) from local earthquake tomography

Fig. 1

Summary seismotectonic map of NW Iran. Major active faults are shown as solid black lines. Arrows and red uncertainty ellipses are GPS measurements (Rastbood and Voosoghi 2011). Gray stars display the location of volcanoes related to collision between the Arabia and Eurasia (Kheirkhah et al. 2009). The square shows location of Tabriz city. The white ellipses show the potential location of historical events on the North Tabriz Fault (NTF). Fault plane solutions are from the Global Centroid-Moment-Tensor (CMT) catalogue (http://www.globalcmt.org/). The white box in Fig. 1 illustrates the study area (Fig. 2). Upper right inset (Fig. 1a) shows the geodynamic setting of the Arabia-Eurasia collision/subduction framework while the lower right inset (Fig. 1b) shows the average velocity vectors on both northern and southern side of the NTF. Based on the GPS data it can be noted that, considering a 12 mm/year velocity vector for the southern side of the fault compared to 14 mm/year for the northern side, a locally transtensional tectonic regime will result for the NTF

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