New data on the geodynamics of southern Peru from computerized analysis of SPOT and SAR ERS-1 images

Role of magma mixing in the petrogenesis of tephra erupted during the 1990–98 explosive activity of Nevado Sabancaya, southern Peru

“…They form regional scale extensional lineaments, parallel to the trench, which affect the whole Arequipa region in southern Peru (Fig. 9 in Huaman et al 1993;Mering et al 1996). (ii) A N85-trending fault system, located at the southern edge of the Rio Colca valley (Fig.…”

“…1b). (i) Two N135-striking fault zones, the Ichupampa and Huanca, are mainly characterised by dip-slip motions with a small sinistral strike-slip component (Mering et al 1996;Antayhua 2001). They form regional scale extensional lineaments, parallel to the trench, which affect the whole Arequipa region in southern Peru (Fig.…”

Deformation and seismicity near Sabancaya volcano, southern Peru, from 2002 to 2015

“…The most recent eruption of Sabancaya spanned 1990-1998, following about 200 years of dormancy [Gerbe and Thouret, 2004]. The volcano is surrounded by an extensive system of active faults and lineaments (Figure 1c)-the Huambo-Cabanaconde Fault Zone to the northwest, which is composed of the Trigal and Solarpampa normal faults and minor subparallel faults; the Ichupampa normal fault to the northeast; the Pampa Sepina fault zone and Sepina lineament to the east; and the Huanca normal fault to the southwest [Sebrier et al, 1985;Mering et al, 1996;Huamán-Rodrigo et al, 1993;Macharé et al, 2003].…”

Stratovolcanoes in the Western Cordillera – Polish Scientifi c Expedition to Peru 2003–2012 reconnaissance research

“…Pull-apart type structures formed in the investigated area, as a result of transtensional forces, which caused the opening of deep fi ssures in the crust and raising magma to the surface. This type of origin was proposed in the case of Sabancaya volcanic activity (Mering et al, 1996).…”