Notícia -A A +A

Hawaiian Volcano Observatory Status Report, USGS, Wednesday, July 25, 2018, 9h15 AM HST - Notícia OVGA 30-07-2018

 

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

Kīlauea Volcano Lower East Rift Zone

Fissure 8 continues to erupt lava into the channel leading northeastward from the vent. No new overflows were reported yesterday following the summit collapse event at 6:41 HST; no overflows were reported this morning. In the last day, the lava flow in the Ahalanui area has not extended significantly westward. The flow remains less than 0.1 miles from the Pohoiki boat ramp in Isaac Hale Park. The active ocean entry is still a few hundred yards to the east of this lava flow edge. 

No other fissures are active this morning. 
 

Lava fountaining at the active vent remains relatively low, and is mostly below the height of the current cone (about 50 m, or 55 yards). Pele's hair and other lightweight volcanic glass fragments from the lava fountain at Fissure 8 continue to fall downwind of the fissure, dusting the ground within a few hundred meters (yards) of the vent. High 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 activity as conditions allow and are reporting information to Hawaii County Civil Defense. Observations are also collected on a daily basis from cracks in the area of Highway 130; no significant changes in temperature, crack width, or gas emissions have been noted for several days.

Volcanic gas emissions remain very high. VOG information can be found at https://vog.ivhhn.org/

The ocean entry is a hazardous area. The interaction of lava with the ocean creates "laze", a corrosive seawater plume laden with hydrochloric acid and fine volcanic particles that drifts downwind and can irritate the skin, eyes, and lungs. Close to the ocean entry, flying debris from explosive interaction between lava and water is a primary hazard. Additionally, submarine magma-water interaction can result in explosive activity beyond the visible lava delta, creating a hazard that extends offshore. The lava delta is unstable because it is built up to 800 m (0.5 mi) from the former coastline 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. 

Magma continues to be supplied to the Lower East Rift Zone. Seismicity remains relatively low although higher amplitude tremor is occasionally being recorded on seismic stations close to the ocean entry.

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

Kīlauea Volcano Summit

The most recent collapse event occurred at 6:41 AM HST yesterday, July 24, and was similar in character and magnitude to previous events. Seismicity has increased steadily since then; since yesterday afternoon the number of events per hour has fluctuated between about 20 and 40. The next collapse event is expected this afternoon or evening. Inward slumping of the rim and walls of Halemaʻumaʻu continues.

Sulfur dioxide emissions from the volcano's summit are very low. This gas and minor amounts of ash resuspended by wind are being transported downwind. Small bursts of ash and gas may coincide with the summit collapse events. The summit region is occasionally impacted by sulfur dioxide from the lower East Rift Zone eruption.

Forecasts of ashfall under forecast wind conditions: https://volcanoes.usgs.gov/observatories/hvo/ash_information.html

Information on volcanic ash hazards and how to prepare for ash fall maybe found at http://www.ivhhn.org/information#ash (health impacts) OR https://volcanoes.usgs.gov/volcanic_ash/ (other impacts). 

MORE INFORMATION

Subscribe to these messages: https://volcanoes.usgs.gov/vns2/

Webcam images: https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_webcams.html

Photos/Video: https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_chronology.html

Lava Flow Maps: https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_maps.html

Definitions of terms used in update: https://volcanoes.usgs.gov/volcanoes/kilauea/extra/definitions.pdf

Overview of Kīlauea summit (Halemaʻumaʻu) and East Rift Zone (Puʻu ʻŌʻō) eruptions:
https://volcanoes.usgs.gov/volcanoes/kilauea/extra/background.pdf

Summary of volcanic hazards from Kīlauea eruptions:
https://volcanoes.usgs.gov/volcanoes/kilauea/extra/hazards.pdf

Recent Earthquakes in Hawai'i (map and list):
https://volcanoes.usgs.gov/hvo/earthquakes/

Explanation of Volcano Alert Levels and Aviation Color Codes:
https://volcanoes.usgs.gov/activity/alertsystem/index.php
https://pubs.usgs.gov/fs/2006/3139/ 

CONTACT INFORMATION:

askHVO@usgs.gov 

The Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawai`i. 

 

Fonte: USGS