Can I visualize two location table on one map? and get distances between two points?

I have two data table.
Table No.1 : my clients' locations with latitude and longitude.
Table No.2 : realtime earthquake data with ltitude and longitude. (automatically updated every 5min.)
- source link : http://earthquake.usgs.gov/earthquakes/feed/v1.0/csv.php

Question no.1
Can I put two table's lat./long. in one map? I can make two seperated map with each table but I can't make it on one map.

Question no.2
I want to calculate distance between all my clients' location to each earthquake's position.
and I want to show clients' position which is nearby earthquake points (maybe in 100km radius)