Mayon Volcano’s seismic monitoring network did not detect any volcanic earthquake during the 24-hour observation period. Sulfur dioxide (SO₂) emission was measured at an average of 1,377 tonnes/day on 30 November 2018. Precise leveling data obtained on 08-13 December 2018 indicate a slight inflation of the edifice relative to 22-31 October 2018. Continuous GPS and electronic tilt data further show pronounced inflation of the mid-slopes since June 2018, possibly due to aseismic magma intrusion deep beneath the edifice.