It does look like a triggered earthquake, doesn't it, but wait a while and see
if it goes away. It is not uncommon with large earthquakes for local groups
to locate the earthquake at a nearby epicenter where it really is just the
farther earthquake. If this is the case, it would appear that the "triggered"
earthquake corresponded exactly with the arrival of the P- wave from the
original.
The distance between these two events is 4.0 degrees and the time between
the events is 1min 2 sec. The travel time of the P-wave is 1 minute 2 seconds
for this distance. Sure looks to me like the Pine Flat earthquake is a ghost
event - just a local misreading of the seismogram. I'll disappear soon from
the charts. If not, it is either a unique example of P-wave triggering, or
someone is not doing their job.