Volcano Watch

On January 3, 2014, Kīlauea's Pu‘u ‘Ō‘ō eruption surpasses 31 years of activity. The ongoing eruption has evolved tremendously during its complex...

During the course of an eruption, a volcano can produce a variety of hazards, such as lava flows, pyroclastic flows, and lahars (volcanic mudflows)...

The gas emissions from Kīlaueaa volcano have been variable within a fairly steady range for the past few years; however, the numbers that we use to...

During the past year, the USGS Hawaiian Volcano Observatory (HVO), like other federal agencies, dealt with the challenges of budget cuts...

Last week we showed that Kīlauea has explosive eruptions that can carry volcanic ash (less than 2 mm or 0.08 in across) and small lapilli (2–64 mm or...

In past Volcano Watches, we've emphasized a radically new way to view Kīlauea—as an explosive volcano. Though not explosive now, it was dominantly...

At the U.S. Geological Survey's (USGS) Hawaiian Volcano Observatory (HVO), we focus on keeping up with the flow of data coming into our systems and...

We are currently sandwiched between the Halloween and Thanksgiving holidays as the inexorable march of time brings the winter festivals ever closer...

About a year ago, a Volcano Watch article described recent changes at Lake Waiau, the tiny lake just below Mauna Kea's summit that is Hawai‘i's only...

Earlier this year, the Alaska Volcano Observatory (AVO) completed its first 25 years of operation. It received widespread acknowledgement for its...

On October 17, at 10:17 a.m., HST, thousands of Hawai‘i residents took part in the state’s first Great Hawaii ShakeOut. The Hawaiian Volcano...

The Earth's surface, oceans, and atmosphere are readily accessible to direct exploration.

The Hawaiian Volcano Observatory will remain operational during the lapse of federal government appropriations.

The Hawaiian Volcano Observatory will remain operational during the lapse of federal government appropriations.

This week, the Hawaiian Volcano Observatory is saying goodbye to two good friends: Jessica Johnson and Ben McLeod. Jess and Ben arrived in Hawai‘i in...

Get ready! The Great Hawaii ShakeOut will "rumble" across the islands at 10:17 a.m., HST, on October 17, 2013.

Despite reports to the contrary, Mauna Loa is still the largest ACTIVE volcano on Earth. The volcano off the east coast of Japan, which made the news...

Two of Hawai‘i's largest historical earthquakes occurred during an intense swarm of more than 6,200 earthquakes beneath Hualālai volcano between mid...

On a clear night, as you gaze up at the myriad constellations visible in the dark skies of Hawai‘i, you can often see what looks like a small, bright...

Hualālai, looming majestically above Kailua-Kona, is Hawai‘i's third most active volcano (http://hvo.wr.usgs.gov/volcanowatch/archive/2009/09_10_01...