Inicio del régimen transpresivo en la Falla de Alhama de Murcia, algunas evidencias cartográficas y de campo

1. J.J. Martínez Díaz ¹
2. J. Alonso-Henar ¹
3. J.A. Álvarez-Gómez ¹
4. C. Canora ²
5. P. Herrero-Barbero ¹
6. J.M. Insua-Arévalo ¹
7. R. Pérez-López ³
8. E. Rodríguez-Escudero ¹
9. M. Tsige ¹
10. J.L. Sánchez-Roldán ¹

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Abstract

Montenat (1973) defined for the first time the Alhama de Murcia fault (AMF) as a strike-slip fault with some transpressive component, originated from a tectonic inversion, associated with a change in the regional tectonic regime. During the last decades there have been a few studies in which different time frames have been proposed for the initiation of this kinematics. Knowing when started that transpressive kinematics in the FAM that can be observed at present from seismic (focal mecha- nisms) and geodesic data, and also evidenced during the Quaternary from geomophological and palaeoseismic observations is of great interest to: -1) to understand the tectonic evolution of the Eastern Betics during the Miocene and Plio- Quaternary, -2) to obtain more precise estimates of long-term slip rate and -3) to understand the kinematic and rheological evolution of the deformation fabric observed in the fault rocks of the FAM involving materials of very different ages. We present an update of the detailed mapping of several sections of the Lorca-Totana segment on the SE flank of the La Tercia range, whose tectonic interpretation has varied in last decades. Special interest was focused in the cross section along the Rambla de Lébor and in the Matalahuga compressional strike-slip duplex. The evidence supports a pre-Tortonian onset of the transpressive regime in this sector of the FAM and a net strike-slip component similar to the reverse-slip component since Late Tortonian.

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