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HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE

Monday, April 24, 2017, 8:52 AM HST

KILAUEA VOLCANO
19°25'16" N 155°17'13" W, Summit Elevation 4091 ft (1247 m)

Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary: Kīlauea Volcano continues to erupt at the summit and at
Puʻu ʻŌʻō on the East Rift Zone. The episode 61g lava flow continues to enter
the ocean at Kamokuna, where a small lava delta has been growing since late
March. Surface flows remain active above the pali near Puʻu ʻŌʻō. These flows
pose no threat to nearby communities. At the summit, the lava lake level is
about 22 m (72 ft) below the floor of Halemaʻumaʻu Crater and is visible from
the Jaggar Museum overlook this morning.

Summit Observations: Tiltmeters at Kīlauea's summit continued to record slow
inflation over the past day. The lava lake level has remained fairly constant over
the last several days and was measured at about 22 m (72 ft) below the floor of
Halemaʻumaʻu Crater Friday morning. There was no change in the levels of
seismicity at the summit. Tremor amplitude continued to fluctuate with the vigor
of lava lake spattering. Summit sulfur dioxide emission rates remained high.

Puʻu ʻŌʻō Observations: Webcam images over the past 24 hours showed
persistent glow at long-term sources within the Puʻu ʻŌʻō crater and from a
small lava pond on the west side of the crater. Seismicity was steady over the
past 24 hours. A tiltmeter on Puʻu ʻŌʻō cone recorded no significant net change
in tilt over the past day. The sulfur dioxide emission rate from all East Rift Zone
vents remained elevated but significantly lower than the summit emission rate.

Lava Flow Observations: The episode 61g flow was still active, entering the
ocean, and slowly building a lava delta at Kamokuna. No active surface flows
were observed in webcam views on the coastal plain yesterday, but surface
flows remained active on the upper portion of the 61g flow field above the pali,
posing no threat to nearby communities at this time.

As a strong caution to visitors viewing the ocean entry (where lava meets the
sea), there are additional significant hazards besides walking on uneven
surfaces and around unstable, extremely steep sea cliffs. Venturing too close to
an ocean entry on land or the ocean exposes you to flying debris created by
sudden explosive interaction between lava and water. Also, the new land
created 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, once started, have also incorporated parts of the older sea cliff. This
occurred most recently on December 31. Additionally, the interaction of lava
with the ocean creates a corrosive seawater plume laden with hydrochloric acid
and fine volcanic particles that can irritate the skin, eyes, and lungs.
This map shows recent changes to Kīlauea’s East Rift Zone lava flow
field. The area of the active flow field as of March 30 is shown in pink,
while widening and advancement of the active flow as of April 10 is
shown in red. Older Puʻu ʻŌʻō lava flows (1983–2016) are shown in gray.
The yellow line is the trace of the active lava tube (dashed where
uncertain).

The blue lines over the Puʻu ʻŌʻō flow field are steepest-descent paths
calculated from a 2013 digital elevation model (DEM), while the blue lines
on the rest of the map are steepest-descent paths calculated from a 1983
DEM (for calculation details, see http://pubs.usgs.gov/of/2007/1264/).
Video from July 2016 of flow moving toward ocean
A steady stream of lava exiting the episode 61g lava tube pours into the
ocean at the Kamokuna ocean entry. The interaction between the lava and
ocean water causes explosive reactions, throwing bits of lava.
TIME-LAPSE sequence of lava lake activity at Halemaʻumaʻu