Images

Catastrophic landslide near Oso, Washington, March 22, 2014.

Station map showing seismograph stations used in the location of the M4.8 earthquake that occurred near Norris Geyser Basin on March 30, 2014.  The yellow star shows the earthquake epicenter.  Red triangles represent seismograph stations with a P-wave arrival pick.  Green triangles represent seismograph stations with both a P-wave and a S-wave arrival

Record section showing horizontal component seismograms from stations in the Yellowstone region from the M4.8 earthquake that occurred near Norris Geyser Basin on March 30, 2014.  The vertical blue dashed line represents the origin time of the earthquake at 12:34:39.16 UTC.  The red line represents the P-wave arrival with a velocity of ~5.7 km/s.  The

3-component seismograms from station YHB for the M4.8 earthquake that occurred near Norris Geyser Basin on March 30, 2014, and showing the P-wave arrival pick (red) and the S-wave arrival pick (green) as determined by UUSS analysts.  The vertical blue dashed line represents the origin time of the earthquake at 12:34:39.16 UTC.

Mar 21, 2014: The Kahauale‘a 2 flow remains active, with the active flow front slowly moving through thick forest northeast of Pu‘u ‘Ō‘ō. The flow front today was 8.2 km (5.1 miles) northeast of the vent on Pu‘u ‘Ō‘ō, which is visible in the center of the photograph, although partly obscured by fume and smoke from burning trees.

(Right) Spattering at the edge of the pond during the fall cycle.

Mar 21, 2014: The lava lake at the summit of Kīlauea Volcano remains active. During our observation today, the lava lake surface was about 40 m (131 ft) below the rim of the vent (the Overlook crater) within Halema‘uma‘u Crater.

Mar 21, 2014: (Left) The lava pond surface at its highest level observed during our field work today—just before the release of gas caused it to drop during the fall cycle of the gas pistoning.

Mar 21, 2014: The small (10 meters, or 30 feet, wide) lava pond within the northeast spatter cone on Pu‘u ‘Ō‘ō experiences cyclic rises and falls of the lava surface called "gas pistoning," driven by the buildup and release of gas in the pond. At the time of this photograph, the pond surface had dropped following the release of gas.

Mar 21, 2014: The release of gas from the lava pond at Pu‘u ‘Ō‘ō nearly obscures the spatter (fluid fragments of molten lava) being thrown about a meter (3 ft) high.

Mar 7, 2014: Another view of the active flow front, which is burning forest and causing scattered fires. Mauna Loa (left) and Mauna Kea (right, with a snow-covered summit) are on the skyline in this wide photograph. At the very left edge of the photo, the plume from Kīlauea's summit lava lake can be seen.

Mar 7, 2014: A close-up of the lava pond in Pu‘u ‘Ō‘ō crater, with snow-covered Mauna Kea in the distance.

Mar 7, 2014: The lava lake in the Overlook crater, within Halema‘uma‘u Crater, at Kīlauea's summit remains active. Today, winds carried the plume towards the north, providing a clear view of the persistent spattering area in the southeast portion of the lake.

Mar 7, 2014: The Kahauale‘a 2 flow remains active, and the active flow front is moving through thick forest northeast of Pu‘u ‘Ō‘ō. The flow front today was 7.9 km (4.9 miles) northeast of the vent on Pu‘u ‘Ō‘ō. Pu‘u ‘Ō‘ō is visible in the upper left of the photograph, and is partly obscured by fume.

Mar 7, 2014: The northeast spatter cone has had a small (10 meters, or 30 feet, wide) lava pond, which experiences a cyclic rise and fall of the lava surface called "gas pistoning", driven by the buildup and release of gas in the pond. This photograph captured the moment of gas release, which involved vigorous spattering.

Mar 7, 2014: View of Pu‘u ‘Ō‘ō from the south. Pu‘u ‘Ō‘ō's tan-colored south flank is composed of cinder and spatter erupted in its early years (mid-1980s). Since that time, the cone has partially collapsed and lava flows have erupted on the flanks and within the crater, sometimes spilling over the crater rim.

Mauve indicates areas at risk from lava flows and avalanches of hot rock and gases called pyroclastic flows. Bright red areas that fade to orange and yellow indicate potential routes for lahars (volcanic mudflows). Not shown are areas subject to hazards from volcanic ash.

Newberry Volcano, Oregon simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

Mount Adams, Washington simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

Three Sisters, Oregon simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.

Mount Hood, Oregon simplified hazards map showing potential impact area for ground-based hazards during a volcanic event.