///The
research on M4.8 earthquake sequence of Feb.16, 2012 shows that the
earthquake was late strong aftershock of Heyuan MS6.1
principal earthquake in 1962. The focal mechanism solution identifies that the
principal compressive stress of the earthquake has almost the same direction as
that in South China, and is defined as strike-slip and fault rupture. The
possible unconfirmed small broken belt in northwest of reservoir is also
identified as the possible seismogenic structure for this earthquake. The b
value calculation shows that Heyuan reservoir areas were in the low stress
state since 1960, so it is believed that strong destructive earthquake is
unlikely to occur again in the future. So far this is the only time that
short-term information of seismometry and premonition with prediction
significance was simultaneously acquired before happening of moderate strong
earthquake in south China.
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