SEISMOLOG started as a Reptilian Scout here on Earth. Then, after repeated sexual encounters with human women, he became interested in keeping us around and allowing us to blossom into our hyper-advanced spacefaring future-selves. He is our first line of defense in the result of a Reptilian Invasion, and will warn us if the Reptilians ever decide to declare war on the human race.
(http://i.imgur.com/ekFbQjX.png)