Filter Total Items: 326
Date published: November 8, 2021

Newly Revised "Geologic map of the State of Hawaii" publication available

The USGS recently published a revised “Geologic Map of the State of Hawaii.” This map—originally published in 2007—has been updated to include more recent geologic deposits, including lava flows from Kīlauea’s Pu‘u‘ō‘ō vent on the middle East Rift Zone from 2007–2018 and lava flows erupted during Kīlauea’s 2018 lower East Rift Zone eruption.

Date published: August 19, 2021

Photo and Video Chronology – Mauna Loa – August 19, 2021

HVO scientists collect high-precision Global Positioning System (GPS) data to assess hazards and understand evolving processes at Mauna Loa.

Date published: July 15, 2021

Volcano Watch — Learning from the 1984 eruption of Mauna Loa

The most recent page in Mauna Loa’s eruptive history was written in 1984. The eruption began in March of 1984, about a decade after the 1975 summit eruption (the topic of last week’s “Volcano Watch” article). Here’s a quick look at how the eruption proceeded and its impacts on residents ...

Date published: July 8, 2021

Volcano Watch — Remembering Mauna Loa’s eruption on July 5–6, 1975

Mauna Loa erupted forty-six years ago this week, on July 5–6, 1975, in a 20-hour event with vents confined to the summit region (the area above 3,660 m/12,000 ft) and lava flows descending to just below 3,170 m (10,400 ft). This was the first eruption in 25 years, at the time the longest quiet stretch since 1843 (we are currently in the longest stretch at 37 years and counting). 

Date published: June 24, 2021

Volcano Watch — Seismic halfalogues: earthquakes are only part of the conversation

The journey from volcanic repose to a climactic eruption is like a mystery movie that keeps you at the edge of your seat. The story is filled with twists and turns that often lead to dead ends.  

Date published: June 17, 2021

USGS HVO Information Statement — Magnitude-4.5 earthquake northeast of Pāhala, Island of Hawai‘i

The U.S. Geological Survey's Hawaiian Volcano Observatory (HVO) recorded a magnitude-4.5 earthquake located beneath the south part of the Island of Hawai‘i, in the district of Kaʻū, on Thursday, June 17, at 4:32 p.m., HST.

Date published: June 10, 2021

Volcano Watch — Campaign season is here! Another way HVO tracks changes on Hawaiian volcanoes

Geodetic surveys measure the change in shape of our volcanoes due to changes in magma supply and storage. The USGS Hawaiian Volcano Observatory (HVO) has a long history of using many different types of instruments and technologies over the decades to detect these changes.   

Date published: June 8, 2021

New HVO webcam: [MKcam] Mauna Loa's Summit and Northeast Rift Zone from Mauna Kea

A new USGS Hawaiian Volcano Observatory webcam provides views of Mauna Loa’s summit and Northeast Rift Zone. The webcam view is to the south from its position on the slope of Mauna Kea. Near-live webcam views and a 24-hour animated GIF are available here:

Date published: May 20, 2021

Volcano Watch — New research sheds light on recent Pāhala earthquake swarms

Many people in Kaʻū have noticed the swarm of earthquakes taking place during the past few years. These earthquakes are happening in a zone that is 29-40 km (18-25 miles) beneath Pāhala and extends south about 10 km (6 miles) offshore. Some of the largest earthquakes from this region have been felt throughout the Island of Hawai‘i. 

Date published: May 6, 2021

Volcano Watch — Tiny changes at Mauna Loa’s summit hold big clues

Although Mauna Loa is Earth’s largest active volcano, it has lived in the shadow of Kīlauea since it last erupted in 1984.  The geologic record shows that Mauna Loa erupts every seven years on average; however, 37 years have passed since lava flows from the volcano’s Northeast Rift Zone came within 7 km (4 miles) of Hilo. 

Date published: April 22, 2021

Volcano Watch — How measuring gravity on Mauna Kea helps us monitor Mauna Loa

Gravimeters, essentially extremely precise pendulums, can measure a change in the force of gravity to one-in-one billionth of the force you feel every day. This force varies based on the distance and the amount of mass between the instrument (or you) and the center of the Earth.