Bible Answer

Should I be concerned about the increase of earthquakes?

In the Revelation study, Pastor Armstrong talks about the increase of earthquakes being a sign we are in the end times. But are there more earthquakes registered only because we have better technology?

You are correct about technology becoming more advance, therefore, picking up more movement of earthquakes. However, we should acknowledge that if the Bible says more earthquakes will begin to happen as we approach End Times, then we must assume the trend (regardless of newer technology or not) to be true. Moreover, should we measure something that doesn't involve technology, for example, famine, then we will also see a natural uptick around the world, America included.

In Christ's Olivet Discourse we read:

MATTHEW 24:7 For nation will rise against nation, and kingdom against kingdom, and in various places there will be famines and earthquakes. 
MATTHEW 24:8 But all these things are merely the beginning of birth pangs.

Regardless, as we see the increase of earthquakes and such, we should continue to be ready to welcome our Lord's return and live with eyes for eternity.