|People play golf the Kilauea volcano ash plume rises in the distance on Hawaii's Big Island.|
The Kilauea volcano in Hawaii has been causing earthquakes up to 4.4 magnitude on Wednesday.
One crater began shooting out “ballistic blocks” up to 60cm, and explosions could become more powerful.
The Kilauea volcano in Hawaii began causing earthquakes on Wednesday afternoon, after morning explosions of “ballistic blocks” three times larger than bowling balls.
Earthquakes up to 4.4 magnitude have been measured after Kilauea’s caldera, one if its large craters, dropped 90cm causing nearby faults to move.
The earthquakes are expected to continue and become more frequent, but because of their shallow depth will be more damaging to the nearby region.
Earlier in the day, ballistic blocks up to 60cm were found in a parking lot hundreds of metres from Kilauea’s Halemaumau crater.
“These reflect the most energetic explosions yet observed and could reflect the onset of steam-driven explosive activity,” USGS said.
“Additional such explosions are expected and could be more powerful.”
Lava outbreaks are also still possible.
On Tuesday, the volcano’s warning system was raised to it its highest level because of the risk to aviation from increased emissions and heights of ash clouds.