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A plume rising from a crater caused by Kilauea. Photo: Mario Tama/Getty Images

Hawaii's Kilauea volcano continues to erupt, prompting mass evacuations in the southeastern part of the Big Island.

Threat level: The situation is highly dynamic, as lava continues to flow to the surface and the lava lake in the center of the crater sinks, which could lead to bigger problems. According to the U.S. Geological Survey (USGS), the mountain could have an "explosive" eruption as a result of the current draining of the lava lake in the crater.

How it works: If the magma reaches the water table and is then covered by falling rocks, it could lead to an explosive steam explosion. This could hurl huge boulders into the air, and vault ash high into the atmosphere. (It would not be as destructive or violent an eruption as a volcano like Mount St. Helens, however.)

The numbers on Kilauea:

  • 35 years of eruptions: Kilauea has been erupting since 1983, though the recent uptick in activity began on May 3.
  • This one had a 6.9 magnitude earthquake: The current eruption was accompanied by an earthquake on May 4. This was the strongest quake to strike Hawaii since 1975.
  • About 2,000 residents have been forced to evacuate over the last week since lava began flowing out of new fissures in the ground.
  • The eruption caused 24 hours of sustained earthquakes throughout the island, as magma flowed toward the surface.
  • Lava has destroyed 36 structures including 26 homes in the area since May 3.
  • 15 volcanic vents: The Leilani Estates and Lanipuna Gardens neighborhoods are under threat from lava oozing to the surface from more than a dozen ruptures in the ground. There are 770 homes in Leilani Estates, per AP.
  • Unknown date and time: The USGS says that an explosive steam eruption could happen with little to no warning, and would expand the danger zone beyond just the lava fissures.

Go deeper: How the volcanic eruption in Hawaii could get worse

Go deeper

Salesforce rolls the dice on Slack

Illustration: Sarah Grillo/Axios

Salesforce's likely acquisition of workplace messaging service Slack — not yet a done deal but widely anticipated to be announced Tuesday afternoon — represents a big gamble for everyone involved.

For Slack, challenged by competition from Microsoft, the bet is that a deeper-pocketed owner like Salesforce, with wide experience selling into large companies, will help the bottom line.

FBI stats show border cities are among the safest

Data: FBI, Kansas Bureau of Investigation; Note: This table includes the eight largest communities on the U.S.-Mexico border and eight other U.S. cities similar in population size and demographics; Chart: Naema Ahmed/Axios

U.S. communities along the Mexico border are among the safest in America, with some border cities holding crime rates well below the national average, FBI statistics show.

Why it matters: The latest crime data collected by the FBI from 2019 contradicts the narrative by President Trump and others that the U.S.-Mexico border is a "lawless" region suffering from violence and mayhem.

Miriam Kramer, author of Space
2 hours ago - Science

The rise of military space powers

Illustration: Aïda Amer/Axios

Nations around the world are shoring up their defensive and offensive capabilities in space — for today's wars and tomorrow's.

Why it matters: Using space as a warfighting domain opens up new avenues for technologically advanced nations to dominate their enemies. But it can also make those countries more vulnerable to attack in novel ways.