On May 15, a 5.4 magnitude earthquake was felt 140 miles (225 km) W of Coos Bay, Oregon. (Smithsonian Institution Global Volcanism Program).

On May 15, a 6.2 magnitude earthquake was felt 5 miles (10 km) E of Su-ao, Taiwan. (National Earthquake Information Center).

An extremely large deflation episode began at Kilauea's Pu`u `O`o cone on 12 May at about 0720. By 1500 Pu`u `O`o had deflated about 16.5 microradians. Following the onset of deflation at Pu`u `O`o, there was slight deflation at Kilauea's caldera. No new eruptive activity was visible in Pu`u `O`o 's crater. Within a couple of hundred meters of the SW base of Pu`u `O`o, two large ~3-m-wide lava flows were visible that apparently broke out of the upper lava-tube system. By 13 May Pu`u `O`o had deflated 18 microradians, tremor at Pu`u `O`o was higher than preceding the deflation and was accompanied by small earthquakes, background tremor and long-period earthquakes increased at the summit, and no significant deformation was recorded at the volcano. (Smithsonian Institution Global Volcanism Program).

On May 14, a 5.2 magnitude earthquake was felt 15 miles (20 km) NW of Hollister, California. (National Earthquake Information Center).

On May 12, a 5.9 magnitude earthquake was felt 140 miles (220 km) S of Ternate, Moluccas, Indonesia. (National Earthquake Information Center).

A small earthquake cluster event, with magnitudes between 1.1-1.7, occurred at Mauna Loa during 19-26 April. There were no signs indicating that an eruptive event was imminent and no significant deformation was recorded. (Smithsonian Institution Global Volcanism Program).

On May 4, a series of three earthquakes ranging from 3.5 to 4.5 in magnitude shook Northern California approximately 40 miles (65 km) SW of Eureka. (National Earthquake Information Center).

On May 4, a 5.1 magnitude earthquake was felt 75 miles (120 km) ENE of Westport, New Zealand. (National Earthquake Information Center).

As of 29 April volcanism continued at Colima with incandescent lava avalanches travelling down the volcano's flanks and seismicity occurring that was indicative of small explosive events and landslides. Incandescent lava avalanches, generated from the fronts of block-lava flows, continued to travel 2-3 km down Colima's S, E, and W flanks and 700 m down the SW flank. (Smithsonian Institution Global Volcanism Program).

During 19-24 April, there was an increase in the number of deep and shallow volcanic earthquakes at Dieng in comparison to previous weeks. A small steam cloud rose 20-25 m above Sileri crater and temperatures taken at several crater lakes on the 20th and 21st had not increased. The volcano was at Alert Level 2 (on a scale of 1-4). (Smithsonian Institution Global Volcanism Program).