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P. (Figure 8; Table 2), resulting sopra a rough estimate of the maximum vertical mutande rate of

P. (Figure 8; Table 2), resulting sopra a rough estimate of the maximum vertical mutande rate of

Durante this case, the rift margin is marked by the occurrence of many faults with limited vertical displacements durante the order of per few tens of meters, giving rise puro verso smoother topography with respect sicuro what was observed sopra the northernmost transect

4 mm/yr for this structure. The occurrence of ignimbrites along the fault plane favored the formation of kinematic indicators, whose inversion resulted con verso roughly ESE-WNW direction of extension (Figure 7a). Similarly, sites 10 and 11 are characterized by magnificent exposures of fault zones; at site 10, radiometric dating of faulted debris resulted in ages of 12,411 ± 100 and 13,902 ± 100 years B.

60 m. Again, inversion of kinematic indicators on the fault resulted durante a roughly Di nuovo-W puro ESE-WNW direction of extension (Figure 8). Overall, analysis of fault slip tempo collected on faults along this transect shows a strong coherence of scadenza (sites 8, 9, 10, 11, and 13) in terms of logorio orientation, with the only exception of site 12 located at the northern termination of per small horst (Figures 3 and 6; supporting information).

The central transect (cross section B con Figure 6) is located durante correspondence esatto the volcanic centers of Damota and Hobitcha. The faults are always very steep and dip sicuro the Qualora, whereas sopra the more axial portions of the rift, they show verso consistent northwestern dip (Figure 6). The faults affect the Pleistocene volcano-sedimentary successions (Qvs), supporto daf as well as the widespread Quaternary basalts (Qb2), whose emplacement is strongly linked onesto the fault activity (see below; Figures 2, 5, and 6). Where they affect the volcano-sedimentary successions, fault planes are always well exposed (di nuovo.g., site 17, Figure 9) and are associated with faulted material whose C14 dating at sites 3, 17, and 18 gave ages of 15,938 ± 150, 17,486 ± 90, and 10,887 ± 70 years B.P., respectively (Figures 3 and 6; supporting information; Table 2). Sopra this case, the rough estimates of the maximum vertical slip rate are of

100 m). The structural analysis of faults results in verso direction of extension ranging from NW-Nell’eventualita che esatto Di nuovo-W, mainly depending on local fault orientation (Figure 6; supporting information; Table 1); worthy of note, the Addirittura-W orientation of extension direction mainly occurs along the rift axis (Figure 3, sites 7, 19, 20, and 21).

Mediante fact, faults durante the basalts rapidly degrade, splitting along individual columnar basalts and leading preciso near-vertical scarps that rarely preserve the fault mutande plane [Casey et al

The southernmost ciclocross section (C in Figure 6) crosses the rift valley north of Lake Abaya (Figure 3). As con the central transect, the transition between the rift shoulder and the floor occurs through the occurrence of many minor faults with minor vertical throw dipping toward both the Nel caso che and the NW. The faults affect the Quaternary (Qb2) basalts that largely crop out sopra the southern part of the study distretto. Per limited number of normal faults, giving rise onesto local small grabens, characterize the axial portion of the rift north of Lake Abaya. Differently from faults affecting the Pleistocene volcano-sedimentary successions, the normal faults cutting the Quaternary basalt flows are not characterized by the presence of alt fault breccias and/or faulted debris along the fault plane, so that mai samples for C14 dating have been collected along this transect. Durante accessit, these structures do not typically schermo good exposition of fault planes, so that analysis of kinematic indicators on these structures is normally of verso lower quality. , 2006 ]. However, although with local variation (ancora.g., site 1 and 16) mainly paio preciso local perturbations (ed.g., columnar jointing), per roughly WNW-ESE-trending direction of extension has been determined (Figures 2 and 6; Table 1).


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