Monitoring variations of crustal media after the M_S4.6 Ruichang-Yangxin earthquake by coda wave interferometry

Based on the event waveform data and its observation report of the 2011 Ruichang-Yangxin M_S4.6 earthquake sequence processed by the double-difference method, waveform cross-correlation and coda wave interferometry, two groups of repeating earthquakes (cc≥0.920, recorded by station Huangmei and station Jiujiang) can be obtained: D₁ (2011-09-11 05:44 M_L2.3 and 2011-10-24 08:06 M_L2.2) and D₂ (2011-09-18 07:06 M_L2.8 and 2011-10-24 08:06 M_L2.2). It could be found that the velocity of early S wave coda increased within 1.5 months (2011-09-11—10-24) in source region after the M_S4.6 Ruichang-Yangxin earthquake.