30Dec2015 19:50:50 Z
The left sound channel is horizontal acceleration. The right: vertical. The video shows the vertical and horizontal axes correctly.
The video runs at 15 times real time speed.
This is a magnitude 5.1, 110km deep, earthquake, 50 km north-west of French Pass
It was recorded about 135.4km distant in Kapiti, New Zealand.
The S wave arrives about 18.75 seconds after the P wave.
135.4km / 18.75 seconds = 7.2km per second of PS difference.
Turn it up.