Double Duo in Tonga

Over 24 hours, two moderately-sized earthquakes have shaken Tonga with force.  Earlier today, 7/16/2017 at 17:06hrs UTC (12:06 pm CST) the island shook with a magnitude 5.8 (mb) quake and again another event with magnitude 5.5  (mb) at 01:20hrs UTC (08:20hrs CST).  Both focal depths were approximately 10kms deep.  The seismograms for both events are shown, in comparison, below:

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