13Jul2015 16:09:32 Z
The left sound channel is horizontal acceleration. The right: vertical. The video shows the vertical and horizontal axes correctly.
The video runs at 10 times real time speed.
This is a magnitude 4.3, 5km deep, earthquake, 25 km north-west of Levin
It was recorded about 41.5km distant in Kapiti, New Zealand.
The S wave arrives about 5.6 seconds after the P wave.
41.5km / 5.6 seconds = 7.4km per second of PS difference.
Turn it up.