Abstract

GOMEZ-ARREDONDO, Carmen M.; MONTALVO-ARRIETA, Juan C.; IGLESIAS-MENDOZA, Arturo  and  ESPINDOLA-CASTRO, Víctor H.. Relocation and seismotectonic interpretation of the seismic swarm of August - December of 2012 in the Linares area, northeastern Mexico. Geofís. Intl [online]. 2016, vol.55, n.2, pp.95-106. ISSN 2954-436X.

We relocated 52 events of 2.5 ≤ Mc ≤ 3.6 from a seismic sequence of over 250 events that occurred during July-December 2012 southwest of the Linares area, northeastern Mexico. To examine this swarm four seismic stations were installed in the region and operated during different time periods from September to December. Relocation of the swarm showed that the earthquake hypocentral depths were at 8 (±5) km, and the time residuals had values ≤ 0.38 s. The fault plane solutions were generated for individual earthquakes and through the use of the composite mechanism technique. The focal mechanism solutions show pure reverse faulting; the SW dipping NNW - SSE trending nodal plane is the inferred fault plane (strike ~150 ° , dip ~50 ° and rake ~67°), which reveals that maximum horizontal stress (SHmax > Shmin > Sv) predominates in the area.

Keywords : Maximum horizontal stress; current stress field; focal mechanism; Sierra Madre Oriental; intraplate seismicity.

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