Reading the Meters

Objectives
Archmage Berinand at the Transitus Shield has asked you to collect the readings from his instruments in Coldarra.
 * Nexus Geological Reading
 * Southern Coldarra Reading
 * Northern Coldarra Reading
 * Western Coldarra Reading

Description
I had hoped that the Nexus' impact was limited to this region. Recently though, reports have flooded in from all over Azeroth suggesting that geologic instability is growing exponentially!

I need the Nexus monitored regularly as I work to develop a solution.

I've placed sensitive instruments around Coldarra, disguised as Malygos' scrying orbs. One lies in the trench near the Nexus, and three are hidden in the structures around the valley's perimeter. Visit each and return to me with their readings.

Rewards
You will receive:

Progress
Have you read all of my instruments, ?

Completion
This is worse than I expected.

Malygos is channeling too much power to this place. If he's not stop, Azeroth will be the next Outland! Fortunately, I believe that I've engineered a temporary solution....

Progression

 * 1) Reading the Meters
 * 2) Postponing the Inevitable