Alaska Volcano Observatory Image Database

AVO IMAGE DATABASE

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Caption:	Sentinel-2 and WorldView-2 captured good views of recent ash and pyroclastic density current deposits, as well as lahars and a lava flow, on these November 26 images of Shishaldin Volcano. The summit is largely obscured by vigorous steaming but a near-infrared (NIR) anomaly shows the vent at the top of the active scoria cone. The lava flow is apparent in the short-wave infrared (SWIR) bands in the Sentinel-2 image with a run out of ~1 km. New lahars on the northwest flank can be traced into drainages that extend all the way to the coast. Others reach ~4.7 km to the NW and ~1 km to the N. Trace ash deposits extend at least 7 km to the north, while a thicker northward directed deposit extends ~1.5 km from the vent. The package of flows to the NW include lahars in meltwater channels as well as pyroclastic density current deposits. The furthest of these pyroclastic density currents went about 3.4 km from vent.
Date:	November 26, 2019 10:20 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	High-resolution satellite radar images of Shishaldin show changes in the central scoria cone and new flowage deposits on the NW flank between 20 and 25 November. The summit cone partially collapsed during a pause in eruptive activity between November 20–23, producing concentric ring faults within the summit crater. Then between November 24 and 25, the eruption produced a large new > 3.3 km-long pyroclastic flow deposit and lava flow down the northwest flank. These can be seen in the radar data by streaks on the snowy surface and new meltwater channels. By November 25, the summit cone had been rebuilt with no faulting a new more circular vent. Some distortion is caused by the oblique satellite look angles and the terrain correction. This imagery was provided by Simon Plank (German Aerospace Center, DLR) through an ongoing collaboration with the Alaska Volcano Observatory on remote sensing of volcanic eruptions.
Date:	November 25, 2019 5:13 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	This high-resolution satellite radar image of Shishaldin shows new flowage deposits on the NW flank that formed between between November 24 and 25. The eruption produced a large new > 3.3 km-long pyroclastic flow deposit and lava flow down the northwest flank. These can be seen in the radar data by streaks on the snowy surface and new meltwater channels. Some distortion is caused by the oblique satellite look angles and the terrain correction. This imagery was provided by Simon Plank (German Aerospace Center, DLR) through an ongoing collaboration with the Alaska Volcano Observatory on remote sensing of volcanic eruptions.
Date:	November 25, 2019 5:13 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	This high-resolution satellite radar image of the summit of Shishaldin shows the growing central scoria cone filling most of the pre-eruptive summit crater. A new vent within this cone and another to the south have formed during recent more explosive activity. Lava flows and lahars are also visible radiating from the summit to the northwest, north, and northeast. Some distortion is caused by the oblique satellite look angle and the terrain correction. This imagery was provided by Simon Plank (German Aerospace Center, DLR) through an ongoing collaboration with the Alaska Volcano Observatory on remote sensing of volcanic eruptions.
Date:	November 14, 2019 5:13 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	A clear view of Shishaldin in this Nov 11 WorldView-3 image captured a new lava flow to the NE that extends ~1 km from the summit cone (red in this near-infrared composite image). Below the flow, a large network of lahars with meltwater channels has formed, extending >5.5 km along the flow path from the vent (4.5 km from the lava flow toe). The lahars branch at 3 km from vent with an eastern flow reaching ~4.5 km from vent, as well. Ash deposits cover the NE sector of the volcano. A second northward lava flow is now 1.2 km long and still shows some incandescence near the vent. It is much less active with minimal lahar activity at the front. Glowing spatter dots the scoria cone surface in all directions and hot spatter on the upper flanks beyond the crater rim is apparent in shortwave infrared bands.
Date:	November 11, 2019 10:41 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	A volcanic "smoke ring" produced in the ongoing eruption of Shishaldin was captured in this clear WorldView-3 satellite view on Nov 11, 2019. These rare clouds are produced from strombolian eruptive activity and have been observed during eruptions of Stromboli and Etna volcanoes in Italy. New black lahar deposits extending from an active lava flow melting snow and ice upslope are also seen in the background.
Date:	November 11, 2019 10:41 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	Video of Shishaldin, taken Nov 11, 2019, by Bruce Butler, US Fish and Wildlife Service.
Date:	November 11, 2019 12:00 AM
Photographer:

Shishaldin

Caldera/crater, Cinder cone, Lava flow, Stratovolcano, Tephra

Caption:	This DigitalGlobe WorldView-3 near-infrared (NIR) composite image on November 3 shows a branched active flow down the northwest slope. The western lobe has a length of 900 m, whereas the eastern one extends further to ~1000 m from the vent. New lahars to the south are now visible extending at least 1700 m from the crater rim, and the ones to southwest are 1500 m. Lahar formation downslope from the new lava flow extends to 2 km from the vent. In the vent area, spatter is visible above the crater and on the slopes of the cone. No significant new tephra deposits are visible.
Date:	November 3, 2019 10:15 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	Volcanic gas emissions from summit fumaroles on Makushin Volcano form a small plume in light winds.
Date:	October 31, 2019 10:02 AM
Photographer:	Kaufman, Max

Makushin

Steam, Volcano

Caption:	Multispectral DigitalGlobe high-resolution imagery of Shishaldin from October 28 22:20 UTC shows a variety of eruptive deposits from the ongoing activity (left: near Infrared RGB, right: shortwave Infrared). The lava flow on the northwest slope is active but mostly concealed by clouds, and the SWIR anomaly extends ~850 m from the central vent. The top of the flow where it spills out of the summit crater is visible near the vent. The central spatter cone is shown by the NIR and SWIR anomalies (although SWIR is saturated, leaving a hole of no data), and spatter on snow on the upper slopes can be seen. A distinct steam plume is visible, as well. On the flanks, an apron of tephra deposits extends to the north about 2.5 km. A few short lahars are visible through the clouds near the summit, but the biggest feature is the long lahar to the NW that branches extensively at lower slopes and travels at least 5 km from the summit to the edge of the image.
Date:	October 28, 2019 10:20 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	This near infrared multispectral DigitalGlobe image from October 28 22:20 UTC shows the summit crater of Shishaldin. A lava flow spilling out of the crater can be seen on the northwest side. The central spatter cone is cloaked in steam within the crater, with a steam plume drifting to the NE and deposits of spatter on snow on the upper slopes.
Date:	October 28, 2019 10:20 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	This clear view of Shishaldin in a Sentinel-2 image from 10/24/2019 shows incandescence in the summit crater with a very small steam plume. The summit crater is filled with lava that is escaping the crater rim to the NW and feeding a ~800-m-long lava flow that is highlighted in the near-infrared. This flow is melting snow, feeding a lahar extending below the cloud deck out of view. No other lava flows beyond the summit crater are apparent, but another lahar to the NNE extends about 1.3 km downslope. The summit area is darkened by deposits to about 800 m radius to the north with small lahars extending a similar distance to the east.
Date:	October 24, 2019 10:06 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	This clear view of Shishaldin in a Sentinel-2 image from 10/24/2019 shows incandescence in the summit crater with a very small steam plume. The summit crater is filled with lava that is escaping the crater rim to the NW and feeding a ~800-m-long lava flow. This in turn feeds a lahar extending below the cloud deck out of view. No other lava flows beyond the summit crater are apparent, but another lahar to the NNE extends about 1.3 km downslope. The summit area is darkened by deposits to about 800 m radius to the north with small lahars extending a similar distance to the east. The dark streak of an ash deposit extends at least 8.5 km to the SE.
Date:	October 24, 2019 10:06 PM
Photographer:	Dietterich, Hannah

Shishaldin

Caption:	Incandescence, due to hot material at the summit of Shishaldin, visible in Shishaldin webcam image (circled area) on the evening of Oct 21, 2019.
Date:	October 21, 2019 9:33 PM
Photographer:	Shishaldin webcamera,

Shishaldin

Eruption cloud/ plume/ column

Caption:	Infrasonic tremor from likely Strombolian eruptive activity at Shishaldin volcano as registered on AVO's newly upgraded infrasound array in Sand Point, AK. The calculated back azimuth is pegged strongly in the direction of Shishaldin. Infrasound is low-frequency (inaudible) sound energy that propagates long distances in the atmosphere.
Date:	October 21, 2019 7:20 PM
Photographer:	Kaufman, Max

Shishaldin

Infrasound

Caption:	Photograph of a steam plume at Shishaldin taken by an ACE Air Cargo pilot from flight AER963 into Cold Bay on October 21, 2019.
Date:	October 21, 2019 2:45 PM
Photographer:	Mosier, Ben

Shishaldin

Caption:	Steam emissions from strombolian eruptive activity in the summit crater of Shishaldin Volcano as seen from the NW.
Date:	October 21, 2019 1:03 PM
Photographer:	Camera, Web

Shishaldin

Eruption cloud/ plume/ column, Steam, Stratovolcano, Volcano

Caption:	Steam emissions from eruptive activity in the summit crater of Shishaldin volcano as seen from the SE, on Oct 21, 2019.
Date:	October 21, 2019 12:08 PM
Photographer:	Camera, Web

Shishaldin

Eruption cloud/ plume/ column, Infrasound, Stratovolcano, Volcano

Caption:	Shishaldin summit on October 21, 2019 from Cold Bay. Strombolian activity with incandescence is visible within the crater, as well as a steam plume rising above. Courtesy of Ben Lagasse and Andrew Reeves.
Date:	October 21, 2019 12:00 AM
Photographer:	Lagasse, Ben

Shishaldin

Eruption cloud/ plume/ column, Lava fountaining

Caption:	Upgrade of AVO's Sand Point infrasound array, Oct 2019. This 6-element listening array is designed to detect explosive activity at Pavlof Volcano, 90km (56 mi) to the west. Alder groves provide excellent protection from the winds on Popof Island. The perforated aluminum cone helps reduce wind noise.
Date:	October 15, 2019 12:46 PM
Photographer:	Kaufman, Max

Array

Fieldwork operations, Infrasound

Caption:	Upgrade of AVO's Sand Point infrasound array, Oct 2019. This 6-element listening array is designed to detect explosive activity at Pavlof Volcano, 90km (56 mi) to the west. The infrasound sensors each have 2 ports to the outside of their cases.
Date:	October 15, 2019 12:39 PM
Photographer:	Kaufman, Max

Array

Fieldwork operations, Infrasound

Caption:	Upgrade of AVO's Sand Point infrasound array, Oct 2019. This 6-element listening array is designed to detect explosive activity at Pavlof Volcano, 90km (56 mi) to the west. Alder groves provide excellent protection from the winds on Popof Island. The perforated aluminum cone covers the box and helps reduce wind noise.
Date:	October 15, 2019 12:34 PM
Photographer:	Kaufman, Max

Array

Fieldwork operations, Infrasound

Caption:	Upgrade of AVO's Sand Point infrasound array, Oct 2019. This 6-element listening array is designed to detect explosive activity at Pavlof Volcano, 90km (56 mi) to the west. Alder groves provide excellent protection from the winds on Popof Island. The perforated aluminum cone helps reduce wind noise.
Date:	October 15, 2019 12:28 PM
Photographer:	Kaufman, Max

Array

Fieldwork operations, Infrasound

Caption:	Redoubt Volcano
Date:	October 8, 2019 9:18 PM
Photographer:	Mayo, Wyatt

Redoubt

Dome, Volcano

Caption:	DigitalGlobe image showing the crater area of Shishaldin with a small wispy plume. The previously active scoria cone and surface lava flows have collapsed into the crater and are no longer visible.
Date:	October 4, 2019 10:37 PM
Photographer:	Dietterich, Hannah

Shishaldin

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