This past week, Kīlauea Volcano's summit lava lake level fluctuated in concert with summit inflation and deflation, ranging about 32–38 m (105–125 ft) below the vent rim. On the East Rift Zone, the 61g flow remained active, with lava entering the ocean near Kamokuna and surface breakouts downslope of Pu'u 'Ō'ō. Widening cracks and slumping on the Kamokuna lava delta indicate its instability and potential for collapse. The 61g flows do not pose an immediate threat to nearby communities.
Mauna Loa is not erupting. During the past week, small-magnitude earthquakes continued to occur beneath the volcano, primarily in the south caldera and upper Southwest Rift Zone, at depths less than 5 km (3 mi). Additional deeper events (5–13 km, or 3–8 mi) occurred beneath the upper west and southeast flanks of the volcano. GPS measurements continue to show deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone. No significant changes in volcanic gas emissions were measured.
One earthquake with three or more felt reports occurred on the Island of Hawaiʻi during the past week: On August 29, 2017, at 3:52 p.m. HST, a magnitude-3.8 earthquake located 12 km (7 mi) beneath Hawaiian Ocean View Estates.