IFO locked at NLN and Observing for past 15.25 hours. Environmental conditions are good. Another Mag 4.6 earthquake in Eureka CA. Very sharp up and down on the signal, and no apparent disturbance to the IFO. Monitoring the Violin Modes. Several are elevated. No action taken as the IFO is locked at 55.1Mpc and both LLO and Virgo are in science mode.