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Mauna Loa--History, Hazards and Risk of Living with the World's Largest

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Mauna Loa--History, Hazards and Risk of Living with the World's Largest Mauna Loa—History, Hazards, and Risk of Living With the World’s Largest Volcano auna Loa on the Island of M Hawai‘i is the world’s largest volcano. People residing on its flanks face many hazards that come with living on or near an active volcano, including lava flows, explosive erup- tions, volcanic smog, damaging earthquakes, and local tsunami (giant seawaves). The County of Hawai‘i (Island of Hawai‘i) is the fastest grow- ing County in the State of Hawaii. Its expanding population and increas- ing development mean that risk from volcano hazards will continue to grow. U.S. Geological Survey (USGS) scientists at the Hawaiian Volcano Observatory (HVO) closely monitor and study Mauna Loa Volcano to Mauna Loa, the world’s largest volcano, has erupted many times, producing large and enable timely warning of hazardous long-traveled lava flows, and it will erupt again and pose a significant risk to inhabitants activity and help protect lives and of the Island of Hawai‘i. During its most recent eruption in 1984, a lava flow approached property. the city of Hilo, as seen in this nighttime photograph (photo by David Little). Mauna Loa, the world’s largest volcano, en- compasses more than half the Island of Hawai‘i and rises to 4,169 meters (13,679 feet) above Kohala the Pacific Ocean. A very active volcano, it has produced large, voluminous flows of basalt (very fluid, dark lava) that have reached the ocean eight times since 1868. It last erupted in 1984, when a Map of the Island Waikoloa of Hawai‘i, show- lava flow came within 7.2 km (4.5 miles) of Hilo, Mauna Kea ing Mauna Loa (! the largest population center on the island. With and the other four (! such a propensity to produce large flows, Mauna Kohala volcanoes that Loa is considered(! a “high priority” for monitor- Hilo make up the island. Mauna Kea Hualālai ing by the U.S.(! Geological Survey (USGS). (! Structural features +$ Hualälai In Hawai‘i,(! eruptionsHilo of basalt are, in gen- shown on Mauna +$ (! eral, placid outpourings(! of fluid lava flows, build- Loa include the (! (! +$ summit caldera, rift ing the *#+$gentle slopes characteristic of “shield” *# +$ +$ *#+$ (!+$ Northeast Rift Zone (! +$ +$ +$ zones, radial vents, (! volcanoes.*#+$(! +$(! The greatestKïlauea direct(! hazards associated Northeast Rift Zone (! +$Moku‘āweoweo *# +$ Radial Vents +$ (!+$ +$Caldera (! (! *# +$ +$ (! +$ *# (! *#+$(!# *#+$ +$ *# and historical lava (! *+$(!+$*#(! (! (! +$ (! *#*#(!+$(! *#+$+$*#+$ Moku‘āweoweo with+$ shield+$(! volcanoes+$+$+$*#(! +$(! (!+$+$ +$ are the lava flows and *#+$ (! +$ (! +$ Mauna Loa +$ +$+$ Caldera +$ +$ (! (! +$+$ flows. Southwest Rift Zone +$ Kīlauea emissions+$ of+$ (!volcanic+$ (! gases. Although these sel- (! +$ +$ (!+$ +$ (! (! +$ dom cause(! deaths, lava flows typically do exten- Mauna Loa (! (! Legend sive damage by covering,Mauna Loa boundary burning, and crushing South Kona Southwest Rift Zone Ü *# Tilt sites everything(! in their+$ GPS path. Basalt flows can travel more than0 5 50 10 Miles km(! Seismic from sites their vent, making most communities on the Island of Hawai‘i susceptible Hawaiian Legend Ocean to lava-flow inundation. And gas emissions can View be carried by the wind and reach other islands in Estates Radial vents the State, producing human health concerns and Ü Mauna Loa boundary damaging crops and livestock. Historical lava flows Ka‘u 0 5 10 Miles Rift zone Mauna Loa has a summit caldera (a large 0 10 Kilometers oval volcanic depression) and two rift zones U.S. Department of the Interior USGS Fact Sheet 2012–3104 U.S. Geological Survey August 2012 Seismic station near north rim of Seismic and GPS stations on Mauna Mokuÿäweoweo Caldera. Loa’s eastern flank (person at left gives scale). Seismic station high on the Southwest Rift Zone. Map of the Island of Hawai‘i, showing the numerous moni- toring stations across the island in 2011. Both Mauna Loa and Kïlauea Volcanoes are intensively monitored by the Seismic station at 10,000 feet Hawaiian Volcano Observatory. Inset photographs show a elevation on the Southwest Rift few of the stations on Mauna Loa. Zone. extending northeast and southwest from the cal- Eruptive History of Mauna Loa Seven flows from the southwest rift zone reached dera. Most of Mauna Loa’s eruptions begin with the ocean along the west coast of Hawai‘i within lava fountains from a series of fissure vents in the Mauna Loa erupts frequently—over the a matter of hours. In 1855–56 and 1880–81, lava summit region and then often migrate to vents past 3,000 years it has erupted lava flows, on from Mauna Loa’s northeast rift zone did not down either rift zone. average, every 6 years. Since 1843, Mauna Loa reach the ocean but covered land now within the Mauna Loa eruptions produce lava at a has erupted 33 times, averaging one eruption city limits of Hilo. Geologic mapping of Mauna much higher rate than those of any other Hawai- every 5 years. All historically recorded Mauna Loa shows that, in the past 150 years, 14 percent ian volcano, even the highly active neighboring Loa eruptions started in the summit area, and (714 km2) of the volcano’s surface was covered Kïlauea volcano, resulting in fast-moving and approximately half have stayed in the summit. by new lava flows. As much as 35 percent to 40 long-travelled lava flows. Such high eruption Seventeen continued from vents in the volcano’s percent (1,800 to 2,060 km2)—an area equal to rates require quick responses in order to protect rift zones, producing lava flows that covered or greater than O‘ahu or Maui—was covered in life and property. broad areas on the lower slopes of the volcano. the past 1,000 years. Risk Posed to Residents of the (! Island of Hawai‘i (! Kohala According to the 2010 census, the Island of Hawaii(! is the fastest growing region in the State Mauna Kea of(! Hawai‘i, with more than 100,000 residents (! +$ and a population that grew by 24 percent in the Hualälai (! Hilo past decade. +$High levels of interest and afford- (! (! (! able land lead to developmental pressures, which (! +$ *#+$ means that more and more construction will *# +$ +$ *#+$ (!+$ Northeast Rift Zone (! +$ +$ +$ (! *#+$(! +$(!occur on theKïlauea flanks (!of the island’s volcanoes. (! +$Moku‘āweoweo *# +$ +$ (!+$ +$Caldera (! (! *# +$ +$ (! +$ *# (! *#+$(!# *#+$ +$ *# (! *+$(!+$*#This(! rapid(! (! growth includes several +$ (! *#*#(!+$(! *#+$+$*#+$ +$ +$(! +$+$+$*#(! +$(! (!+$+$ +$ *#+$ (! +$ (! +$+$ Mauna Loa (! +$ +$ +$ +$ multimillion-dollar(! +$+$ +$ developments built or pro- Southwest Rift+$ Zone +$(! +$ (! +$ +$ (! (!+$ (! +$ (! (!posed+$ on the slopes of Mauna Loa in Waikoloa, Hilo, and Hawaiian Ocean View Estates—the (! (! Legend last is theMauna Nation’s Loa boundary largest development in terms Üof area.*# BetweenTilt sites 1984, the most recent eruption (! +$ GPS 0 5of 10 MilesMauna(! Seismic Loa, sites and 2002, approximately $2.3 billion were invested in new construction on the flanks of the volcano. Monitoring and Emergency Plan- ning Are Ongoing Aerial photograph looking north-northeast across the summit area of Mauna Loa (eleva- Volcanoes often show signs of unrest— tion 4,169 meters or 13,679 feet). At the summit is Moku’äweoweo Caldera, a volcanic such as increased seismicity (earthquakes), depression 3 miles (5 kilometers) long.The pit craters in the foreground are part of the deformation (inflation) of the volcano’s flanks, upper southwest rift zone. Mauna Kea Volcano rises on the skyline. and emission of volcanic gases—days to months in advance of an eruption. The USGS’s Hawaiian Volcano Observatory (HVO) has on Mauna Loa’s north and west flanks, and volcano, at more than 4,000 m (>13,000 ft), recently upgraded its monitoring networks to new geologic mapping, additional age dating, to below sea level on the submarine flanks. Of improve its ability to detect early unrest. Nu- and bathymetric surveys have resulted in the the more than 45 known eruptions from radial merous seismic, GPS, and tilt stations across discovery of additional ones. Radial vents are vents, 3 have occurred in the past 150 years the flanks of Mauna Loa keep a vigilant eye on located at all elevations from the summit of the and 2 of those reached the sea. the mountain 24 hours a day. When unrest is detected, scientists notify emergency-manage- ment officials and increase monitoring efforts. Volcano Hazards from Mauna Loa Lava-flow hazard maps prepared by the Map of the Island of USGS for the Island of Hawai‘i divide the is- Kohala Hawai‘i, showing the land into nine hazard zones, with Zone 1 being lava-flow hazard zones Mauna Kea the area of greatest hazard. The criteria used to Waikoloa only for Mauna Loa. establish these zones are (1) proximity to the Lower numbers indicate greater lava-flow haz- summits and rift zones of the active volcanoes, ards; for example, the (2) frequency of lava coverage during histori- rift zones and summit cal time (since about 1800), (3) area covered Hualālai Hilo area of the volcano, 3 the source regions for within the past 750 years, and (4) topography. 2 For Mauna Loa, Zone 1 includes the 31 out of 33 historical 3 eruptions, are in zone summit and rift zones and Zone 2 includes 1. Also shown are some the regions downslope and adjacent to Zone Mauna Loa 3 Northeast Rift Zone places mentioned in 1. Zone 3 includes regions that appear less 1 the text. (Modified after Moku‘āweoweo Wright and others, hazardous because of greater distance from Caldera Kīlauea South Kona 1992). the summit and rift zones. These three zones 2 cover most of Mauna Loa, although portions 6 of the east and southeast flanks are protected Southwest Rift Zone Legend from lava flows by topography and conse- 3 1 Radial vents Hawaiian quently are in a lower hazard designation of Ocean View Mauna Loa boundary Zone 6. Estates Roads Mauna Loa Hazard zones Although the threat posed by eruptions 6 1 Ü 2 from Mauna Loa’s summit and rift zones is Ka‘u 3 Historical Flows clear, the threat posed by vents outside these 0 5 10 Miles of hazard 6 Increasing severity j areas was not fully appreciated until recently.
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