Hilina Slump
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The Hilina Slump, on the south flank of the
Kīlauea Volcano Kīlauea ( , ) is an active shield volcano in the Hawaiian Islands. Located along the southeastern shore of the Big Island of Hawaii, the volcano is between 210,000 and 280,000 years old and emerged above sea level about 100,000 years ago. ...
on the southeast coast of the Big Island of
Hawaiʻi Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ...
, is the most notable of several landslides that ring each of the Hawaiian Islands. These landslides are the means by which material deposited at a volcano's vents are transferred downward and seaward, eventually spilling onto the seabed to broaden the island. Kīlauea's entire south flank, extending out to Cape Kumukahi, is currently sliding seaward, with some parts of the central portion (over looking the Hilina slump) moving as much as per year, pushed by the forceful injection of magma and pulled by gravity. Current movement of the Hilina slump and recent volcanic activity, coupled with evidence of massive submarine slides in the geological past, has led to claims that
megatsunami A megatsunami is a very large wave created by a large, sudden displacement of material into a body of water. Megatsunamis have quite different features from ordinary tsunamis. Ordinary tsunamis are caused by underwater tectonic activity (movemen ...
s might result if the south flank of Kīlauea should suddenly fail.


Geology

The Hawaiian Islands are volcanoes, the newest part of the Hawaiian-Emperor seamount chain, created by eruption of magma from the Hawaiʻi hotspot. As the Pacific plate, moving to the northwest, carries the existing volcanoes away from the hotspot, new volcanoes form at the southeastern end. The newest and largest island is the Big Island of Hawaiʻi, formed by the merger of seven volcanoes. The largest, at the trailing edge of the island, is Mauna Loa Volcano, and on its seaward flank is the younger
Kīlauea Kīlauea ( , ) is an active shield volcano in the Hawaiian Islands. Located along the southeastern shore of the Big Island of Hawaii, the volcano is between 210,000 and 280,000 years old and emerged above sea level about 100,000 years ago. His ...
, with the still submerged
Kamaʻehuakanaloa Seamount Kamaʻehuakanaloa Seamount (previously known as Lōʻihi) is an active submarine volcano about off the southeast coast of the island of Hawaii. The top of the seamount is about below sea level. This seamount is on the flank of Mauna Loa, the la ...
(formerly Lōʻihi) just off-shore. The Hawaiian volcanoes are shield volcanoes, distinguished from the more familiar stratovolcanoes by their greater breadth and lower gradient slopes. (E.g.: Kilauea's average slope to the east is only 3.3°, and the south slope from the summit to the ocean floor averages only 6°.) When the volcano is over the hotspot a plentiful supply of
magma Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural sa ...
allows it to build a broad shield; when it loses its supply of magma it dies and is eroded back to sea level. Like the rest, Kīlauea is composed of alternating subaerial and submarine lava flows fractured by cooling joints and interbedded with weaker rock, sediments, and
tephra Tephra is fragmental material produced by a volcanic eruption regardless of composition, fragment size, or emplacement mechanism. Volcanologists also refer to airborne fragments as pyroclasts. Once clasts have fallen to the ground, they re ...
, resulting in what has been characterized as a ''fractured rock mass''. These discontinuities form zones of weakness that lead to slope failure. The weight of the rock mass causes extension (stretching) downhill, favoring the formation of vertical structures, such as dip-slip faults and rift zones, parallel to the slope. These disconnect the rock mass from the upper flank, putting more stress on any non-vertical planes of weakness, which may fail and form a slip zone. In their 1999 paper, Smith and Malahoff discussed “magma-jacking” as a major cause of slope failure for the Hilina Slump. Magma jacking occurs when fresh magma is injected into pre-existing fractures or weak rock. The pressure of the injected magma serves to break apart the rock, leading to slope failure. Smith and Malahoff also proposed that Kīlauea's status as a secondary volcanic structure on the flanks of the larger
Mauna Loa Mauna Loa ( or ; Hawaiian: ; en, Long Mountain) is one of five volcanoes that form the Island of Hawaii in the U.S. state of Hawaii in the Pacific Ocean. The largest subaerial volcano (as opposed to subaqueous volcanoes) in both mass and ...
makes it more susceptible to catastrophic collapse. They observed that this trend holds true for many of the historic landslides observed in the Hawaiian island chain. On Kīlauea's seaward flank (where it is not resting against Mauna Loa) these tendencies are evident where magma oozing out of the caldera turns east and west to form the Southwest Rift Zone (SWRZ) and East Rift Zone (ERZ), both parallel to the shore, and also in the cliffs of the Hilina Pali – coincident with dip-slip faults of the Hilina fault system – which form the head-scarp where a large block of rock has slumped down and outward. The rift zones enable transport of lava tens of kilometers away from the caldera (as seen in the current lower Puna eruption). They also serve as wedges, forcing the south flank of Kīlauea downslope across a
décollement Décollement () is a gliding plane between two rock masses, also known as a basal detachment fault. Décollements are a deformational structure, resulting in independent styles of deformation in the rocks above and below the fault. They are ass ...
– a nearly horizontal fault where the volcanic deposits rest on the oceanic crust – about 8 to 10 km deep. The combination of rifting and gravitationally driven slumping results in seaward movement of the entire south flank (see image), especially around the Hilina Pali, with seaward motions of up to per year.


Hilina Slump

On the central portion of the south flank of Kīlauea the thousand-foot high cliffs of the Hilina Pali and similar scarps were recognized as early as 1930 as headscarps resulting from slumping of the coast. The Hilina Pali is the headscarp of the Hilina Slump, a type of landslide where a large and relatively intact block slips along a concave surface, dropping vertically at the head, with the toe often extending upward as well as outward The Hilina Slump extends seaward from both ends of the Hilina Pali out to a depth of . Whether this slump is shallow, or reaches down to the
décollement Décollement () is a gliding plane between two rock masses, also known as a basal detachment fault. Décollements are a deformational structure, resulting in independent styles of deformation in the rocks above and below the fault. They are ass ...
that underlies the entire Kīlauea south flank, is still under debate. With the discovery in the late 1980s that the entire south flank of Kīlauea is involved with submarine landslides the term "Hilina slump" has been applied by some scientists to the broader area. The Hilina slump is sliding seaward on top of the southern flank of the
Kīlauea Kīlauea ( , ) is an active shield volcano in the Hawaiian Islands. Located along the southeastern shore of the Big Island of Hawaii, the volcano is between 210,000 and 280,000 years old and emerged above sea level about 100,000 years ago. His ...
volcano, at an average speed of 10 cm/year (3.9 in/year). Kīlauea is the southeastern portion, about 13.7%, of the Big Island of Hawaii. Compared to the volume of Kīlauea, the submarine slide is between , making up about 10% of the island.. Model results based on present day slope and sea level suggest that earthquake accelerations stronger than about 0.4 to 0.6 ''g'' are enough to exceed the static friction coefficient resulting in a slip along a failure surface. However, recent undersea measurements show that an undersea "bench" has formed a buttress at the forefront of the Hilina Slump, and "this buttress may tend to reduce the likelihood of future catastrophic detachment."


Earthquakes

Earthquakes in Hawaiʻi result from either movement of magma, or sliding of the volcanic edifices which comprise the islands. Some of the seaward slippage of the flank occurs aseismically, without noticeable earthquakes. At other times there is a lurch, resulting in an earthquake of magnitude 6 or greater.


1868

An earthquake on April 2, 1868, rocked the southeast coast of Hawaiʻi with a magnitude estimated between 7.25 and 7.75. It triggered a landslide on the slopes of the
Mauna Loa Mauna Loa ( or ; Hawaiian: ; en, Long Mountain) is one of five volcanoes that form the Island of Hawaii in the U.S. state of Hawaii in the Pacific Ocean. The largest subaerial volcano (as opposed to subaqueous volcanoes) in both mass and ...
volcano A volcano is a rupture in the Crust (geology), crust of a Planet#Planetary-mass objects, planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and volcanic gas, gases to escape from a magma chamber below the surface. On Ear ...
, north of Pāhala, killing 31 people. A tsunami claimed 46 additional lives. The villages of Punaluʻu, Nīnole, Kāwāʻa, Honuʻapo, and Keauhou Landing were severely damaged. According to one account, the tsunami "rolled in over the tops of the coconut trees, probably high ... inland a distance of a quarter of a mile
.4 km 0.4, .4, point four, or dot four may refer to: * The number 0.4 as a fractional number * 0.4 shot, a basketball shot made by player Derek Fisher with 0.4 seconds left in Game 5 of the NBA 2004 Western Conference Semifinals * Point4, a songwriting ...
in some places, taking out to sea when it returned, houses, men, women, and almost everything movable."


1975

A similar earthquake occurred November 29, 1975, with a magnitude of 7.2. A wide section of the Hilina Slump slid into the ocean, widening the crack by . This movement also caused a tsunami that reached a maximum height of at
Keauhou Keauhou (also spelled Keauhoa or Keauhua) is an unincorporated community on the island of Hawaii in Hawaii County, Hawaii, United States. Its elevation is 13 feet (4 m). Because the community has borne multiple names, the Board on Geo ...
Landing. Oceanfront properties were washed off their foundations in Punaluʻu. Two deaths were reported at Halape, and 19 other persons were injured. The shoreline at
Keauhou Bay Keauhou Bay is a historic area in the Kona District of the Big Island of Hawaii. The name comes from ''ke au hou'' which means "the new era" in the Hawaiian Language. Kamehameha III's Birthplace A small enclosure is maintained by the Daughter ...
was dramatically altered.


2018

A magnitude 6.9 earthquake on May 4, 2018 resulted in the slump moving about . It appears to have been precipitated by vibrations caused by the movement of magma in the eastern rift zone of Kīlauea, and in turn, the earthquake preceded further volcanic activity. This could fit into a model of correlation between earthquakes and eruption events described for the earthquakes in 1868 and 1975.


Landslides

The breadth and gentle slopes of young shield volcanoes such as Kīlauea are in contrast to the steep, picturesque cliffs (pali), deeply incised canyons, and narrow ridges typical of the older islands, and for a long while it was a bit of mystery how the latter got that way. In 1930 it was suggested that (at least in some cases) this might be the result of large landslides. In 1964 it was noted that certain areas of sea floor with very blocky topography lay downslope from what appear to be giant amphitheaters (the large bowl left at the head of landslides), suggesting the possibility of ''giant'' landslides. However, that such
mass wasting Mass wasting, also known as mass movement, is a general term for the movement of rock or soil down slopes under the force of gravity. It differs from other processes of erosion in that the debris transported by mass wasting is not entrained in ...
was a ubiquitous feature of Hawaiian geology was not recognized until systematic mapping of the sea floor in the late 1980s identified 17 areas on the flanks of the islands that appear to be the remnants of large landslides. Some aspects of these slides – such as the large volume (estimated at for the Nuuanu slide), the transport of large ("tens of kilometers" in size) blocks or more, and evidence of rapid transport – suggests that some of these slides were, indeed, gigantic, and could have generated giant tsunamis. One of these areas is the south flank of Kīlauea, including the Hilina Slump, which is currently in motion. This has raised concern that failure of the south flank of Kīlauea could generate a tsunami that "may threaten cities in the Pacific region", and that even relatively minor displacement of the Hilina Slump "would be truly disastrous to life and property on Hawaii island, the rest of the archipelago, and possibly the Pacific Rim." While the Hawaiian archipelago faces a significant threat from even relatively minor local events, the threat to other trans-Pacific regions has been deemed "exaggerated". Particularly, the larger, more powerful, and more dramatic landslides seen around the Hawaiian Islands are a type of landslide called debris avalanches, where the material in the slide has broken up into pieces small enough to flow as a relatively narrow — typically less than wide — fast-moving stream that can run out as far as . Debris avalanches, or flows, "commonly represent a single episode of rapid failure", where the potential energy of the slide is released suddenly, and could cause giant tsunamis. On the other hand, slumps are largely intact and undeformed blocks that are wider — up to — and thicker — about — than debris avalanches, and generally slow moving. Slumps commonly move on a concave surface, with the head dropping down almost vertically (as seen at the Hilina Pali and related cliffs), and the toe thrusting upward. Seaward movement of Kīlauea's flank has been largely halted on the western end by the Kamaʻehuakanaloa and Papaʻu seamounts, and slowed east of the Hilina Slump by the Hohonu Seamount. Additional buttressing of Hilina Slump is provided by a "Midslope Bench" (see detailed map above); catastrophic detachment of this landslide is deemed unlikely, and "dire predictions of the future breakaway of the Hilina slump ... may be overstated".


Megatsunamis

Would the collapse of a flank of a Hawaiian volcano result in "towering waves crash ngwith the force of countless atomic bombs onto the coastlines of North America and eastern Asia"? Coupled with the knowledge that the Hawaiian islands are ringed with debris fans where large portions of the various volcanoes have slid into the sea – the volume of the Hilina slump has been estimated at – it seems reasonable to consider the risk of volcanic and/or seismic activity in Hawaiʻi wreaking havoc around the Pacific Rim. Pararas-Carayannis concluded that neither geology nor historic events indicate that Kīlauea's southern flank is "unusually unstable or that a massive collapse is possible in the foreseeable future", but even if such a collapse happened as postulated the far-field effects of the resultant tsunami "have been greatly overstated".


See also

*
Geology of Hawaii The Hawaiian Islands ( haw, Nā Mokupuni o Hawai‘i) are an archipelago of eight major islands, several atolls, and numerous smaller islets in the North Pacific Ocean, extending some from the island of Hawaii in the south to northernmost Kur ...
*
Evolution of Hawaiian volcanoes The fifteen volcanoes that make up the eight principal islands of Hawaii are the youngest in a chain of more than 129 volcanoes that stretch across the North Pacific Ocean, called the Hawaiian–Emperor seamount chain. Hawaii's volcanoes rise an ...
* Nuʻuanu Slide


References


Sources

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U.S. Geological Survey The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and ...
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Elsevier Elsevier () is a Dutch academic publishing company specializing in scientific, technical, and medical content. Its products include journals such as '' The Lancet'', ''Cell'', the ScienceDirect collection of electronic journals, '' Trends'', ...
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