We relocated 15 earthquakes in eastern Myanmar of which magnitudes are MW ≥ 6.0 during 1964 and 2010, together with their aftershocks using the modified joint hypocenter determination (MJHD) method using P-wave arrival times from International Seismological Centre (ISC). We relocated a mainshock and its one-week aftershocks for each MW ≥ 6.0 earthquake. After the relocations of the large earthquakes and their aftershocks, we identified the fault planes of six mainshocks. We found that the length of aftershock areas are approximately 16 km to 80 km. We also obtained a relationship between MW and length L (km) of the fault plane estimated from the length of the aftershocks as follows: log L = 0.72 MW – 3.17.
Furthermore, we relocated earthquakes including small, moderate and large earthquakes in eastern Myanmar to investigate the seismicity of eastern Myanmar using the MJHD method. We used P-wave arrival times from ISC data (1964 to 2010). The total number of the well relocated events is 332. Relocated epicenters concentrated to smaller areas than the ISC epicenters. Although some earthquakes occurred along the active faults, the majority of earthquakes occurred off the active faults. Our results are important and useful for seismic hazard assessment in this region.