23Sep2015 18:47:51 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, 167km deep, earthquake, 25 km south-west of Rotorua
It was recorded about 299km distant in Kapiti, New Zealand.
The S wave arrives about 32.7 seconds after the P wave.
299km / 32.7 seconds = 9.1km per second of PS difference.
Turn it up.