Waveform inversion results of four out of six events of M≥ 4.0 in the Warna region during 2005–2007, using the inversion approach of Kikuchi & Kanamori (1991). The waveform match between the observed (red) and synthetic (blue) filtered displacement seismograms is shown along with the source time function and focal mechanism obtained. Short-period stations with first motion polarities are also superposed on the mechanism. Red-filled triangles represent compressions while the white unfilled triangles are the dilatations. The numbers on the left above the seismograms represent the maximum displacement amplitudes of each trace (in mm) while those on the right indicate the weights used for the corresponding traces. (a) 2007 August 20 (b), 2007 November 24–A, (c) 2007 November 24–B and (d) 2007 November 24–C.