07Dec2017 08:30:16 Z
The left sound channel is horizontal acceleration. The right: vertical. The video shows the vertical and horizontal axes correctly.
The video runs at 18 times real time speed.
This is a magnitude 5.0, 74.5km deep, earthquake, 15km south-east of Nelson
It was recorded about 151km distant in Kapiti, New Zealand.
The S wave arrives about 16.3 seconds after the P wave.
151km / 16.3 seconds = 9.3km per second of PS difference.
Turn it up.