Nouvelles du volcan Kilauea
Kilauea volcano update: Summit caldera: continued inward slumping of Halema’uma’u crater and seismic cycles
Thursday Jun 14, 2018 13:14 PM | IS
This aerial overview of June 12, 2018, shows the dramatic change that Halema‘uma‘u vent underwent over the past few weeks. The image looks west across the crater, with the former Halema‘uma‘u crater floor in the center and the deepest part in the foreground. Ground cracks circumferential to the crater rim can be seen cutting across the parking lot (left). (HVO/USGS)
A closer view of the cracks cutting across the parking lot for the former Halema‘uma‘u visitor overlook (closed since 2008, when an active vent opened within the crater). (HVO/USGS)
Day by day, Kilauea’s summit caldera continues to subside and Halema‘uma‘u crater keeps crumbling with every explosive event. Over the past week, such explosions occurred once per day and have been registered as magnitude 5+ earthquakes. They are however not typical earthquakes at all since there is no major fault-rupturing event. Instead, pressure builds up beneath the rubble pile that is choking the conduit and is released as an explosion – a continuous seismic cycle.
Diagram of the frequency, size and depth of earthquakes registered at Kilauea volcano showing the seismic cycles that occur at the summit (VolcanoDiscovery)
HVO/USGS released new images of the dramatic changes that have occurred Halema‘uma‘u crater in the past couple weeks. The crater’s steep walls continue to slump inward and downward in response to the ongoing summit subsidence. The former Halema‘uma‘u crater floor has subsided at least 100 m (about 300 ft) and the deepest part of Halema‘uma‘u is now about 300 m (1,000 ft) below the crater rim. Circumferential to the crater rim there are both newly formed and growing ground cracks which are by now cutting across the parking lot of the former Halema‘uma‘u visitor overlook, which was closed in 2008 when a lava lake re-appeared in the crater.
Sulfur dioxide emissions from the volcano's summit have dropped to levels that are about half those measured prior to the onset of the current episode of eruptive activity. This gas and minor amounts of ash are being transported downwind, with small bursts of ash and gas accompanying intermittent explosive activity. (HVO/UGS)
Wednesday, Jun 13, 2018
Kilauea volcano update: Kilauea's lower East Rift Zone eruption continuous with vigorous fountaining from fissure 8 and lava flowing into the ocean at former Kapoho Bay
Tuesday, Jun 12, 2018
Kilauea’s eruption in the lower East Rift Zone continues without showing any signs of weakening. The current activity has been sustained for 38 days now, 2 days longer than the last fissure eruption that occurred in this area in 1960. However, compared to the rapid change of activity locations and advancing lava flow fronts, the eruption seems to have geographically settled for the past week. ... [details]
Tuesday, Jun 12, 2018
Sunday, Jun 10, 2018