3 páginas. | Trabajo presentado en el 8th International INQUA Meeting on Paleoseismology, Active Tectonics and Archeoseismology (PATA), 13 – 16 noviembre, 2017, New Zealand.

Trabajo presentado en el 8th International Symposium on Andean Geodynamics (ISAG), realizado en Quito-Ecuador, del 24-26 setiembre, 2019. Evento organizado por el Instituto Geofísico, Escuela Politécnica Nacional (IG-EPN) del Ecuador, y el French Institut de Recherche pour le Développement (IRD).

Trabajo presentado en el 8th International Symposium on Andean Geodynamics (ISAG), realizado en Quito-Ecuador, del 24-26 setiembre, 2019. Evento organizado por el Instituto Geofísico, Escuela Politécnica Nacional (IG-EPN) del Ecuador, y el French Institut de Recherche pour le Développement (IRD).

En el valle del Cusco, se ponen en evidencia las fallas geológicas activas, Tambomachay, Pachatusan y Cusco (Cabrera, 1988; Benavente et al., 2010 y 2013) (Fig. 1). En el Cusco se registran movimientos sísmicos históricos y recientes Mw>5 (1986, 1950 y 1650) (Silgado, 1978, Tavera, 2002). Pero, aun así, el catálogo sísmico histórico e instrumental es limitado en términos de peligrosidad sísmica. Este artículo tiene como objetivo complementar el catálogo sísmico, analizando daños por sismos en sitios arqueológicos emplazados en el valle del Cusco, en este caso, el Parque Arqueológico de Pikillaqta (PAP) (Fig. 1). Esta disciplina se denomina arqueosismología, y fue definida inicialmente por Ambraseys, 1973 y Karcz et al., 1977 como el estudio de daños y deformaciones relacionados a terremotos en sitios arqueológicos. El PAP es un recinto Pre-Inca, ubicado al SE del valle ...

Páginas 47-50 | Trabajo presentado en el 3rd INQUA-IGCP-567 International Workshop on Active Tectonics, Paleoseismology and Archaeoseismology, 19-24 de noviembre, 2012, en Morelia, México.

The seismic activity of Peru has its origin in the convergent margin, where the Nazca plate subducts under the South American plate, a process that generates friction and accumulation of stress, reflected in deformation of the crust and superficial earthquakes (<30km of depth). Cusco was affected by earthquakes in 1950, 1650 and recently in 1986, the first two, major earthquakes of magnitudes greater than 7 MM (Silgado,1978). The Tambomachay active geological fault is located four kilometers to the north of the city of Cusco, and belongs to a large and wide deformation zone, where the structures have NWSE and E-W trends, known as the Zurite-Cusco- Urcos-Sicuani Fault System (Benavente et al., 2013). Recent studies show clear morphological and structural evidence of Quaternary activity on these structures (Sébrier et al., 1985; Mercier et al., 1992; Cabrera, 1988; Benavente et al, 2013),...

Trabajo presentado en el “6th Colloquium on historical earthquakes & paleoseismology studies : Their contribution to the knowledge of the long-term seismic activity and to seismic hazard assessment”, 24-26 October 2018, Han-sur-Lesse, Bélgica

A system of active normal faults around the city of Cusco have severely damaged the city in major earthquakes in pre-hispanic times, 1650 and 1950 CE. Detailed studies of these faults adjacent to Cusco are therefore needed to build an understanding of seismic hazard in the region. We present new geomorphological and paleoseismological evidence for multiple Holocene earthquakes on the Tambomachay Fault, a 20 km-long normal fault that runs along the northern margin of the Cusco Basin. The western segment of the fault preserves fault scarps that cut moraine crests with a mean throw of 4.3 ± 0.4 m. We determine a 13.8 ± 0.6 ka depositional age of these moraines using 10Be cosmogenic surface-exposure dating of boulders embedded in the moraines, implying a Holocene-average fault slip rate of 0.3 ± 0.1 mm/yr. We also excavated a trench across the moraine crests. By reconstructing the trench ...