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Focal mechanism solution using P-wave first-motion data is one of the simplest methods to determine fault geometry. The basic idea of this method is that, the polarity (direction) of the first P-wave arrival varies between seismic stations at different directions from an earthquake (Ligorria and Ammonm, 1999). The first motion is either compression, for the stations located such that material near the fault moves towards the station or dilatation, where the motion is away from the station. Thus, when a P-wave arrives at a seismometer from Earth’s interior, a vertical component seismogram records an upward or downward first motion corresponding to either compression or dilatation (Curtis et al., 2009). The P-wave first-motion data and the azimuth of the recording stations are collected from different stations which forms the prime input to the determination of focal mechanism solution. The focal mechanism solutions of 67 numbers of events form the database for the present study. Most of these solutions are obtained from GCMT (Global Centroid Moment Tensor) database. Few solutions are determined for the present purpose by incorporating more than 45 stations data from ISC Bulletin, RRL-Jorhat and NGRI-Hyderabad seismological bulletin as well.

Focal mechanism solutions of certain earthquakes in Mizoram and its vicinity using P-wave first-motion data