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Paleoseismology of the Venta de Bravo, Tepuxtepec and Temascalcingo faults (Transmexican Volcanic Belt)

AuthorsOrtuño, María; Zuñiga Dávila-Madrid, Ramón; Corominas, Ana; Perea, Héctor ; Ramírez-Herrera, María Teresa; Stepanciková, Petra; Villamor, Pilar; Norini, Gianluca
Issue DateOct-2012
CitationGEOS 32(1): 215 (2012)
AbstractThe Trans-Mexican Volcanic Belt (TMVB) is characterized by a relatively low rate of seismicity. However, several damaging earthquakes have produced a loss of hundreds of human lives in the past centuries (e.g. 27/12/1568; 19/11/19123; 03/01/1920). The seismic risk in this region, in which maximum magnitudes of M 7 are expected, is increased by several factors: a) the earthquakes are generated by faults whose traces are next to overpopulated cities (e.g. México City, Toluca, Guadalajara); b) the E-W oriented faults within the TMVB are associated with lacustrine basins now occupied by many cities and towns. The seismic amplification in these basins might generate site effects, increasing the damage due to an earthquake; c) since the last damaging earthquakes occurred 100 years ago, there is a lack of awareness concerning the exposure to seismic hazard, which is reflected in a low resilience of the population. In this work, we present the results of a paleoseismological research performed within three faults located in the central part of the TMVB, the Venta de Bravo fault (50 km), the Temascalcingo fault (21 km) and the Tepuxtepec fault (7 km). The activity of these E-W oriented crustal faults has displaced Miocene to Holocene deposits, and has been mainly controlled by transtensional kinematics resulting in a system of parallel horsts and grabens. The identification and 14C dating of seismic events affecting Late-Pleistocene and Holocene deposits have led to the recognition of the seismogenic nature of those three faults; the Venta de Bravo fault has produced at least two (and possibly more) large earthquakes during the last 30 ka and the Temascalcingo and Tepuxtepec faults have produced three large earthquakes since 16 ka and 14 ka ago, respectively. Their fault traces suggest that the maximum magnitudes of a possible earthquake can reach M 7. This, together with the site effects and the high population leads us to consider the region to be exposed to a relatively high seismic risk
DescriptionReunión anual Unión Geofísica Mexicana, A.C. del 28 de Octubre al 2 de Noviembre de 2012, Puerto Vallarta, Jalisco, México
Publisher version (URL)http://www.ugm.org.mx/bak/raugm/2012/
Identifiersissn: 0186-1891
Appears in Collections:(ICM) Comunicaciones congresos
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