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Posts Tagged ‘East Rift Zone’

KILAUEA Eruption Destroys Hundreds of Homes

Posted by feww on June 6, 2018

Lava may have already destroyed scores of homes on Big island

Kilauea eruption may have already destroyed as many as 500 homes on Hawaii’s Big Island, according to informed sources.

Report Mirrored From USGS-HVO

HAWAIIAN VOLCANO OBSERVATORY STATUS REPORT – USGS
Tuesday, June 5, 2018, 10:28 PM HST (Wednesday, June 6, 2018, 08:28 UTC)

KILAUEA VOLCANO (VNUM #332010)
19°25’16” N 155°17’13” W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: RED

Kīlauea Volcano Lower East Rift Zone

Vigorous eruption of lava continues from the lower East Rift Zone (LERZ) fissure system in the area of Leilani Estates and Lanipuna Gardens.

Persistent lava fountaining at Fissure 8 is reaching heights of 150-180 feet. This eruptive activity continues to feed a channel transporting lava to the east to the ocean entry in the Kapoho Bay area. Minor breakouts along the channelized flow have been very small and stagnated before travelling any significant distance. HVO’s late afternoon overflight showed that the Fissure 8 flow is continuing to form a lava delta with limited continuing advances into the surviving parts of the Kaphoho Beach Lots and Vacationlands neighborhoods. The northernmost lobe of the Fissure 8 flow is advancing very slowly to the northeast. No other fissure vents are active.

Pele’s hair and other lightweight volcanic glass from high fountaining of Fissure 8 are falling downwind of the fissure and accumulating on the ground within Leilani Estates. Winds may waft lighter particles to greater distances. Residents are urged to minimize exposure to these volcanic particles, which can cause skin and eye irritation similar to volcanic ash.

The most recent map of lava flows can be found at https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_maps.html

HVO field crews are on site tracking the fountains, lava flows, and spattering from multiple fissures as conditions allow and are reporting information to Hawaii County Civil Defense.

Volcanic gas emissions remain very high from the fissure eruptions. Trade wind conditions are bringing vog to the south and west sides of the Island of Hawaii. Afternoon easterly winds may bring vog to communities in the Volcano area.

LERZ Video [Source: USGS-HVO]

The fissure 8 lava fountains were slightly diminished during the overnight hours of June 4-5, with fluctuating heights of about 100 to 160 feet. Previous fountain heights reached a sustained 260 feet. The fountain is partially obscured by a spatter cone (built by an accumulation of lava fragments) that is about 115 ft high. View is from Nohea and Leilani Streets, in the Leilani Estates subdivision.

The ocean entry is a hazardous area. Hazards include walking on uneven, glassy lava flow surfaces and around unstable, vertical sea cliffs. Venturing too close to an ocean entry on land or the ocean exposes you to flying debris from sudden explosive interaction between lava and water. Also, the lava delta is unstable because it is built on unconsolidated lava fragments and sand. This loose material can easily be eroded away by surf, causing the new land to become unsupported and slide into the sea. In several instances, such collapses have also incorporated parts of the older sea cliff. Additionally, the interaction of lava with the ocean creates “laze”, a corrosive seawater plume laden with hydrochloric acid and fine volcanic particles that can irritate the skin, eyes, and lungs.

Magma continues to be supplied to the lower East Rift Zone. Earthquake locations have not moved farther downrift in the past few days and the number of located earthquakes remains low. Seismicity remains relatively low with numerous small magnitude earthquakes and low amplitude background tremor.

Additional ground cracking and outbreaks of lava in the area of the active fissures are possible. Residents downslope of the region of fissures should heed all Hawaii County Civil Defense messages and warnings.

Lava fountains continue at fissure 8. The lava fountain has built a 35 m (115 ft) high spatter cone, as wells as an actively-growing spatter rampart on its eastern side. The lava channel leading from the cone was filled to the top of its levees at the time of this photo. [USGS-HVO]

Kīlauea Volcano Summit

Earthquake activity dropped after Tuesday morning’s small explosion but is slowly rising now, following the pattern of previous events of this type. Monitoring data indicate that subsidence at the summit continues. The mid-day observation flight showed additional Inward slumping of the rim and walls of Halema`uma`u.

Locally felt earthquakes are expected to continue, and further ash explosions are likely.

Over the last week, sulfur dioxide emissions from the volcano’s summit have decreased, but emission rates remain high enough to impact air quality in downwind regions. Additional bursts of gas released with intermittent explosive activity are also transported downwind and may temporarily affect air quality as well.

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KILAUEA VOLCANO: Aerial View of Fissure 17

Posted by feww on May 14, 2018

Eruption of lava continues from the fissure system; more than 700 quakes (M≥2.5) recorded

[volcanic] activity was dominated by lava fountaining, explosion of spatter bombs hundreds of feet into the air, and several advancing lava flow lobes moving generally northeast from fissure 17 at the downrift (northeast) end of the new fissure system. As of about 7 pm, one lobe was 2 yards thick and advancing roughly parallel to Highway 132. The flow front was just over a half mile southeast of the intersection of Highway 132 and Noni Farms Road.

This eruption is still evolving and additional outbreaks of lava are possible. The location of future outbreaks could include areas both uprift (southwest) and downrift (northeast) of the existing fissures, or, existing fissures can be reactivated. Communities downslope of these fissures could be at risk from lava inundation. Activity can change rapidly.

https://volcanoes.usgs.gov/vsc/movies/movie_173947.html

Aerial view of fissure 17 around 4:30 p.m. HST. On the west end of the flow, intermittent percussive jetting threw spatter and lava bombs up to 500 feet above the ground. East margin of the ‘a‘ā flow was cascading into a pit or graben. [USGS-HVO]

Earthquakes at Kīlauea Volcano

Earthquake activity in the summit remains elevated with several strongly felt events at HVO today. Most of these earthquakes are related to the ongoing subsidence of the summit area and earthquakes beneath the south flank of the volcano. [More than 700 earthquakes measuring ≥2.5mw have been recorded since May 3.]

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KILAUEA: Sitting Atop an Active Volcano

Posted by feww on May 8, 2018

HAWAIIAN VOLCANO OBSERVATORY STATUS REPORT – USGS

Monday, May 7, 2018, 5:59 PM HST (Tuesday, May 8, 2018, 03:59 UTC)

KILAUEA VOLCANO (VNUM #332010)
19°25’16” N 155°17’13” W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: ORANGE

Lower East Rift Zone Eruption

The intermittent eruption of lava in the Leilani Estates subdivision in the lower East Rift Zone of Kīlauea Volcano continues. The location of activity today was focused on the southwest portion of the area.

This morning, two new fissure segments broke ground. The first (fissure 11) opened in a forested southwest of Leilani Estates about 9:30 am and was active for only 3 hours. The second (fissure 12) opened about 12:20 between older fissures 10 and 11. By 3:15 pm, both new fissures were [inactive] but the west end of fissure 10 was steaming heavily.

Cracks on Highway 130 widened from 7 cm to 8 cm over the course of the day and additional cracks were found just west of the highway on trend with the eruptive fissures.

–  Rates of seismicity and deformation changed little throughout the day.
–   Gas emissions likely remain elevated in the vicinity of fissures.

Kīlauea Volcano Summit

Tiltmeters at the summit of Kīlauea Volcano continue to record the deflationary trend of the past several days and the lava lake level continues to drop. Rockfalls from the steep crater walls into the retreating lake continue to produce occasional ashy plumes above Halema’uma’u crater. These plumes are expected to continue.

Earthquake activity in the summit remains elevated but has decreased over the past few days. Many of these earthquakes are related to the ongoing subsidence of the summit area and earthquakes beneath the south flank of the volcano.

Aerial view of fissure 12 at 1:15 p.m. HST. [USGS/HVO]

 

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Kilauea: High levels of volcanic gases including SO2 being emitted from fissures

Posted by feww on May 7, 2018

HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE – USGS

Monday, May 7, 2018, 7:45 AM HST (Monday, May 7, 2018, 17:45 UTC)

KILAUEA VOLCANO (VNUM #332010)
19°25’16” N 155°17’13” W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: ORANGE

Summary: Eruption of lava and gas continues at a low level along Kīlauea Volcano’s lower East Rift Zone within the Leilani Estates subdivision. Overnight, active emission of lava and spatter at multiple fissures was minimal. This is likely only a pause in activity; additional outbreaks or a resumption of activity are anticipated as seismicity continues in the area. Deflationary tilt at the summit of the volcano continues and the lava lake level continues to drop. There is no active lava in the Puʻu ʻŌʻō area. Aftershocks from Friday’s magnitude-6.9 earthquake continue and more should be expected, with larger aftershocks potentially producing rockfalls and associated ash clouds above Puʻu ʻŌʻō and Halemaʻumaʻu crater. Seismicity at Kīlauea’s summit remains elevated.

An overflight video from Leilani Estates this afternoon (May 6). Lava erupting from fissure 8 formed an ‘a‘ā flow, which advanced northward about 0.9 km (0.6 miles) by 10:30 a.m HST. This fissure eruption diminished around 4:00 p.m., but the lava flow continued to advance slowly for several hours (last report at about 7 p.m. HST). [USGS/HVO]

Lower East Rift Zone Observations

Lava emission from fissures was minimal overnight. Strong degassing continues from several fissures. Yesterday, a lava flow advanced northward from fissure 8 about 0.9 km (0.6 miles) by 10 a.m., HST before stopping.

In the past 12 hours, deformation of the ground in the area has slowed. Ground cracks are reported crossing Highway 130 west of the eruption site.

Overall seismicity in the area has not changed significantly overnight. Earthquakes continue and seismic stations nearest the fissures record seismicity likely related to ongoing vigorous degassing.

Hazard Analysis:

Continued eruptive activity (fluctuating and intermittent) in the lower East Rift Zone is likely. New outbreaks or resumption of lava production at existing vents can occur at any time.

Areas downslope of erupting fissures are at risk of lava inundation. The general area of Leilani Estates remains at the greatest risk. However, as the eruption progresses, other areas of the lower East Rift Zone may also be at risk.

High levels of volcanic gas including sulphur dioxide are being emitted from the fissure vents. In addition, smoke from burning houses and burning asphalt is a health concern and should be avoided.

As the lava lake level inside Halemaʻumaʻu drops, rockfalls from the enclosing walls may increase in frequency prompting explosions of spatter from the lake onto the nearby crater rim and lofting plumes of ash. Dustings of ash from these events can occur downwind.

Additional aftershocks from the magnitude-6.9 earthquake are expected and some may be strong. Residents are advised to review earthquake preparedness by consulting available resources such as: https://www.shakeout.org/hawaii/dropcoverholdon/

Residents of the Puna District should remain alert, review individual, family, and business emergency plans, and watch for further information about the status of the volcano. [USGS]


Lava moving down Makamae Street in Leilani Estates at 9:32 a.m. on May 6, 2018. [USGS/HVO]

 

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KILAUEA VOLCANO: Lava Erupting Intermittently from 8 Fissures

Posted by feww on May 6, 2018

HAWAIIAN VOLCANO OBSERVATORY STATUS REPORT

USGS –  Saturday, May 5, 2018, 11:42 PM HST (Sunday, May 6, 2018, 09:42 UTC)

KILAUEA VOLCANO (VNUM #332010)
19°25’16” N 155°17’13” W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: ORANGE

Lower East Rift Zone Eruption

The intermittent eruption of lava in the Leilani Estates subdivision in the lower East Rift Zone of Kīlauea Volcano continues. Fissure 7 stopped erupting in mid-afternoon. A new fissure erupted this evening near fissures 2 and 7, and lava fountains reached as high as about 70 m (230 ft). Early this morning, new ground cracks were reported on Highway 130, but no heat or escaping steam was subsequently observed.

Seismicity and deformation are consistent with continued accumulation of magma within the rift zone.

Residents should remain informed and heed Hawaii County Civil Defense closures, warnings, and messages (http://www.hawaiicounty.gov/active-alerts).

For maps showing the locations of eruption features, please see https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_maps.html

For information on volcanic air pollution, please see: http://www.ivhhn.org/vog/

HVO geologists will be in the area overnight to track and report to Hawaii County Civil Defense on the activity, and other scientists are closely tracking the volcano’s overall activity using various monitoring data streams.

Kīlauea Volcano Summit

Tiltmeters at the summit of Kīlauea Volcano continue to record the deflationary trend of the past several days. Satellite InSAR data show that between April 23 and May 5, 2018, the summit caldera floor subsided about 10 cm (4 in). Corresponding to this deflationary trend, the summit lava lake level in Overlook crater has dropped about 128 m (518 ft) below the crater rim since April 30. Rockfalls from the crater walls into the retreating lake produced ashy plumes above Halemaumau crater today, resulting in light ashfall in the summit area. Rockfalls and ashy plumes are expected to continue as the lake level drops.

Earthquake activity in the summit increased in the past 2 days, coincident with the magnitude-6.9 earthquake on May 4 beneath the south flank of Kīlauea. In the past two days, about 152 magnitude-2 and magnitude-3 earthquakes occurred at depths less than 5 km (3 miles) beneath the summit area. Twenty two magnitude 3 earthquakes were recorded. These earthquakes are related to the ongoing subsidence of the summit area and beneath the south flank of the volcano.

View of new fissure from Luana Street near fissure 2 and 7, Leilani Estates


A new fissure erupted this evening near fissures 2 and 7, beginning with small lava spattering at about 8:44 p.m. HST. By 9:00 p.m., lava fountains as high as about 70 m (230 ft) were erupting from the fissure. [USGS/HVO]

Kīlauea Volcano lower East Rift Zone eruption


Left: At 07:45 a.m. HST, today, lava from fissure 7 slowly advanced to the northeast on Hookapu Street in Leilani Estates subdivision on Kīlauea Volcano’s lower East Rift Zone. A map showing the location of the fissures is posted on HVO’s website at https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_maps.html. Right: At 12:26 p.m. HST today, a crack opened on Pohoiki Road just east of Leilani Street in the Leilani Estates subdivsion.  [USGS/HVO]

Nightmare on Leilani and Makamae Streets 


A panoramic view of fissure 7 from the intersection of Leilani and Makamae Streets in the Leilani Estates subdivision. This photo was taken at 06:01 a.m. HST today.  [USGS/HVO]

FIRE-EARTH themes for the eruption photos are available via FIRE-EARTH PULSARS.

Ongoing Seismicity

M4.6 44km SSE of Volcano, Hawaii   –  8.7 km
2018-05-05 03:30:15 (UTC) 

M4.7 – 20km SE of Leilani Estates, Hawaii   –  10.1 km
2018-05-05 01:20:27 (UTC) 

M5.3 – 16km E of Pahala, Hawaii  –  8.9 km
2018-05-05 00:37:10 (UTC)

M4.8 – 8km WSW of Volcano, Hawaii   –  2.7 km
2018-05-04 22:48:19 (UTC)

M4.6 – 13km S of Volcano, Hawaii   –   7.7 km
2018-05-04 22:42:42 (UTC)

M4.6 – 17km S of Volcano, Hawaii  –  7.9 km
2018-05-04 22:37:18 (UTC)

M6.9 – 16km SW of Leilani Estates, Hawaii   –  5.0 km
2018-05-04 22:32:55 (UTC)

M5.4 – 18km SW of Leilani Estates, Hawaii    –   6.9 km
2018-05-04 21:32:44 (UTC)

M5.0 – 18km S of Fern Acres, Hawaii  –  6.9 km
2018-05-03 20:30:56 (UTC)

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KILAUEA: Eruption of lava in the Leilani Estates continues

Posted by feww on May 5, 2018

HAWAIIAN VOLCANO OBSERVATORY STATUS REPORT  – USGS

Friday, May 4, 2018, 4:04 PM HST (Saturday, May 5, 2018, 02:04 UTC)

KILAUEA VOLCANO (VNUM #332010)
19°25’16” N 155°17’13” W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: ORANGE

Eruption of lava in the Leilani Estates subdivision in the lower East Rift Zone of Kīlauea Volcano continues. Several additional eruptive fissures or vents – each several hundred yards long – have opened over the past day. No significant lava flows have yet formed. Spatter and lava are accumulating primarily within a few tens of yards of the vent.

The sixth and most recent fissure is on the eastern edge of the subdivision. Not all fissure vents remain active and no far-traveled lava flows have formed.

For maps showing the locations of these features, please see https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_maps.html

HVO geologists will be in the area overnight to track additional activity that may occur, and other scientists are closely tracking the volcano’s overall activity using various monitoring data streams.

Seismicity and deformation are consistent with continued accumulation of magma within the rift zone. Additional outbreaks of lava are expected.

Residents should remain informed and heed Hawaii County Civil Defense messages (http://www.hawaiicounty.gov/active-alerts).


ABOVE: A new lava fissure (Fissure 2) commenced around 1:00 am HST on Kīlauea Volcano’s lower East Rift Zone on Makamae and Leilani Streets in the Leilani Estates subdivision. Spatter was being thrown roughly 30 m (about 100 ft) high at the time of this photo. Copious amounts of sulfur dioxide gas, which should be avoided, is emitted from active fissures. The eruption is dynamic and changes could occur with little warning. TOP: Steaming cracks at 5:57 a.m. HST in Leilani Estates subdivision, moments before Fissure 3 opened up on Kaupili Street. [USGS/HVO]


Fissure 3 at Leilani and Kaupili Streets in Leilani Estates subdivision at 8:07 a.m. HST today. Lava on the road was approximately 2 m (about 2 yd) thick. [USGS/HVO]

FIRE-EARTH theme for the eruption photos is available via FIRE-EARTH PULSARS.

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Activity at Kilauea – Satellite Images

Posted by feww on March 24, 2011

Kilauea: The World’s Most Active Volcano

KILAUEA VOLCANO
Location: 19°25’16″N 155°17’13″W
Summit Elevation: 1,247 m
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
Source: HVO

HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
Wednesday, March 23, 2011 7:34 AM HST (Wednesday, March 23, 2011 17:34 UTC)

Activity Summary for past 24 hours

  • No molten lava visible at Kilauea volcano surface
  • DI deflation continues
  • Lava lake crusted over very deep within the summit vent
  • Summit seismicity slightly elevated
  • SO2 emissions and ERZ seismicity are low at summit and East Rift ZoneS
  • Sulfur dioxide emission rate about 200 tons per day ((preliminary reading on March 22, 2011)

[NOTE: DI stands for ‘deflation-inflation’ and denotes a volcanic event of uncertain significance.]


Click images to enlarge. Download larger image (571 KB, JPEG)  — captured March 18, 2011


Download larger image (436 KB, JPEG)  —  captured January 16, 2010

“In the image—which depicts mostly infrared wavelengths of light—vegetation is green, older lava flows are brown to black, and “hot” areas are red. In this case, the scorched land and fresh lava in the burn scar appears slightly red and brown, while the still-burning forest fire appears bright red. In the 2010 image, lava stands out within and near Pu’u ‘O’o.” Source: NASA-EO.

On March 5, 2011, a new fissure appeared on Kilauea, the world’s most active volcano. Fresh lava from Kamoamoa fissure spewed to a height of about 50 meters above ground, setting off a forest fire which has since consumed about 2,000 acres.

Kamoamoa fissure is located about 13km  east of the volcano summit, lying along the rift zone between Pu’u ‘O’o and Napau Crater .

The above false-color images of of the are were taken by ALI on the NASA’s EO-1 satellite captureda (top) on March 18, 2011, bottom on 16, 2010 (included for comparison).

Kilauea’s latest episode of ongoing activity began in 1983.

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