The Surprising Ways Mars is Hostile to Life

What would be neat to research would be a deep core on Olympus Mons to see how often it erupted and then estimate the amount per eruption and the total amount erupted.  What if OM is the cause of the core coming to the surface and the resultant decrease in the internal dynamo's efficacy? So much so that the magnetic field is present somewhere underneath the surface of Mars, thereby making it ineffective a deflecting the solar wind and the resultant sterilizing effects on the ionization?