Morphology and Seismology of MW=5.8 2010 July 20 Koodian Earthquake, Southeast Zagros

A MN=5.8 (Institute of Geophysics Seismological Center, University of Tehran) earthquake in 2010 July 20 shook southeastern Zagros, over the active ramp of the Mountain Front Fault (MFF). A body killed during the earthquake and it’s aftershocks have affected hundreds of square kilometers around the epicenter. The shook area has experienced many moderate to large earthquakes at the historical time and the MFF recognized as their responsible. With the combination of the waveforms of seismological networks for the Institute of Geophysics, University of Tehran, International Institute of Earthquake Engineering and Seismology of Iran and a local network of the Geological Survey of Iran at Fars province, the source parameters of the earthquake were modified. For this event the ML magnitude computed 5.4 and a depth of 10 km were estimated. This event is related to the growing of anticlines neighboring the MFF with a fault propagated through their cores as of the other reverse earthquakes in Zagros. Tilting and uplifting of young alluvial deposits neighboring them are evidences for this growing. The iso-seismal curves elongated along MFF and the maximum intensity in MM and JMA scales was estimated VII. A small conjugate shear zone with maximum 1 km elongation, 150 m width and 10 cm of both vertical and right lateral dislocations with the strike of N45˚E, was mapped. Finally for this earthquake there was not any rupture except this T kind rupture which not merits the earthquake magnitude.