geologyMcAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams

Home » Volcanoes » How Does Kilauea Volcano Work?

How Does Kilauea Volcano Work?

Republished from Eruptions of Hawaiian Volcanoes - Past, Present, and Future by Robert. Tilling, Christina Heliker, and Donald. Swanson
U.S. Geological Survey General Information Product 117.

The "Plumbing System" Below Kilauea

From decades of monitoring and research at HVO, K´lauea's volcanic "plumbing system" is now relatively well understood. This system links the processes involved in the formation, transport, storage, and, ultimately, eruption of magma to sustain Hawai'i's active volcanoes.

Partial Melting Over the Hawaiian Hot Spot

K´lauea's plumbing system is believed to extend deep beneath the Earth's surface, where magma is generated by partial melting of material beneath the Pacific Plate as it passes over the Hawaiian hot spot. This belief is based on the persistent recurrence of earthquakes 30 miles or more beneath Hawai'i.

Earthquakes occurring 20-30 miles beneath the surface are probably related to the accumulation and upward movement of magma. Seismic data for levels shallower than 20 miles can be interpreted to define diffuse zones of continuous magma rise, one leading to K´lauea and another to Mauna Loa.

Kilauea's Subsurface Magma Reservoir

Before K´lauea erupts, most of the magma entering the volcano is stored temporarily within a shallow reservoir. Earthquake data and ground-deformation patterns suggest that this reservoir is located 1 to 4 miles beneath the summit and consists of pockets of magma concentrated within a crudely spherical space about 3 miles across. Earthquakes do not occur within the reservoir, because liquid magma does not rupture to generate seismic waves.

Summit and Rift Zone Eruptions

K´lauea eruptions occur either at its summit or within two well-defined swaths (called rift zones) that radiate from the summit. During summit eruptions, the magma reservoir deflates only slightly, if at all. This relation implies that the rate at which magma is erupted nearly equals that at which the reservoir is refilled by new magma from depth. During an eruption in a rift zone, called a rift or flank eruption, however, the summit region undergoes a significant and abrupt deflation as magma moves quickly from the summit reservoir into the rift zone.

Similar summit deflation occurs during a rift intrusion, in which magma injected into the rift zone remains stored underground there rather than breaking the ground surface in an eruption. When the rift eruption or rift intrusion ends, the summit region reinflates as the shallow reservoir is refilled by magma from depth. Small pockets of summit-fed magma may be s tored for a while within a rift zone and form transient secondary reservoirs.

The Mauna Loa Plumbling System

The volcanic plumbing system for Mauna Loa is less well known. Analysis of data from the well-monitored 1975 and 1984 eruptions, however, suggests that the essential features of Mauna Loa's plumbing system are similar to K´lauea's, despite the difference in size between the two volcanoes. Mauna Loa's magma reservoir also may be larger than K´lauea's, which would be consistent with the observations that Mauna Loa eruptions tend to be characterized by higher lava-output rates, longer eruptive fissures, and larger lava flows.

Find it on

More from

volcanic explosivity index
Volcanic Explosivity: Learn about some of the most explosive volcanic eruptions.
Homeowners Insurance
Homeowners Insurance usually does not cover the most common geologic hazards.
Labradorite: A feldspar that produces bright flashes of iridescent colors.
Rock Gallery: Photos of igneous, sedimentary and metamorphic rocks with descriptions.
Fossils: Learn about fossils and fossil discoveries around the world.
Iris Agate
Iris Agate produces surprising colors when light passes through its thin bands.
US Gemstones
United States Gemstones: A diversity of gemstones are produced in the United States.
Sliding Rocks
Sliding Rocks Mystery: What causes these rocks to slide across a Death Valley playa?

How Does Kilauea Work?
Cut-away view looking deep beneath K´lauea Volcano, showing the shallow magma reservoir and the principal magma passageways. Areas in yellow are the most favorable zones for magma movement (arrows show direction) and storage. Though greatly generalized, this depiction of K´lauea's "plumbing system" is compatible with all known scientific information. (Simplified from technical illustration of Michael P. Ryan, USGS.)

Hawaiian Hot Spot
A cutaway view along the Hawaiian island chain showing the inferred mantle plume that has fed the Hawaiian hot spot on the overriding Pacific Plate. The geologic ages of the oldest volcano on each island (Ma = millions of years ago) are progressively older to the northwest, consistent with the hot spot model for the origin of the Hawaiian Ridge-Emperor Seamount Chain. Modified from image of Joel E. Robinson, USGS, in "This Dynamic Planet" map of Simkin and others, 2006. Click image to enlarge

Volcanoes in the News
Will Yellowstone Erupt in Our Lifetime?:  “Yellowstone is like a conveyer belt of caldera...

Volcano Report for Peru and Chile:  Erik Klemetti posts an update on recent activity...

Activity at Tungurahua:  Tungurahua Volcano in Ecuador has been active since...

Restricting the Right to Build?:  An article in the New York Times explores...

Eruption At Hekla?:  Hekla is a volcano in southern Iceland that...

Drone Video of Eruptions at Yasur Volcano ÔÇô Vanuatu:  Shaun O’Callaghan posted a very interesting video of...

geology news
Daily news delivered to you free by RSS or email.
Go to Geology News! Receive Daily News by Email Subscribe to Geology News Feed

Articles About Volcanoes
Types of Volcanic Eruptions
Igneous Rock Photos
East Africa Rift
Yellowstone Supervolcano
Largest Erupton of the 20th Century
News About Volcanoes

© 2005-2014 All Rights Reserved.
Images, code and content of this website are property of Use without permission is prohibited. Pages on this site are protected by Copyscape.