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The USGS noted that observable lava flow began at 2:59 p.m. and \"seismic tremor\" increased at 3:00 p.m.

In an advisory notice posted Wednesday, the agency wrote that \"significant hazards\" of the eruption include \"wall instability, ground cracking, and rockfalls.\" It noted that these hazards could be enhanced by earthquakes, which would endanger members of the public that ventured too close to the volcano within the national park.

\"This underscores the extremely hazardous nature of Kilauea's caldera rim surrounding Halemaʻumaʻu crater, an area that has been closed to the public since late 2007,\" the USGS wrote.

It also said that it \"continues to closely monitor Kilauea and will issue an eruption update tomorrow morning unless there are significant changes before then.\"

The fourth and most recent eruption episode began on Jan. 15, but it had paused over the weekend on Jan. 18.

\"Each episode of lava fountaining since December 23, 2024, has continued for 14 hours to 8 days and episodes have been separated by pauses in eruptive activity lasting less than 24 hours to 12 days,\" the USGS advisory said.

There are about 170 potentially active volcanoes in the U.S., according to the USGS.

ABC News' Marilyn Heck and Jennifer Watts contributed to this report.

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