Michael Poland

Map of horizontal velocities between July and December 2025 at Global Positioning System (GPS) stations P711 and NRWY (arrows and yellow circles; arrow length gives displacement rate) in the area between Norris Geyser Basin and Madison Junction. Dashed black line indicates boundary of Yellowstone Caldera and gray lines are roads.

Plot of numbers of earthquakes per day in the immediate vicinity of the Norris Uplift Anomaly during 2024-2025.  An increase in the rate of seismicity occurred in September-December 2025, especially in November.  The largest earthquake during that time was M2.7.

Map of horizontal velocities between July and December 2025 at Global Positioning System (GPS) stations P711 and NRWY (arrows and yellow circles) in the area between Norris Geyser Basin and Madison Junction. Dashed red line indicates boundary of Yellowstone Caldera and gray lines are roads.

Map of seismicity (red circles) in the Yellowstone region during 2025. Gray lines are roads, black dashed line shows the caldera boundary, Yellowstone National Park is outlined by black dot-dashed line, and gray dashed lines denote state boundaries.

Interferogram created from satellite radar data collected on October 7, 2024, and October 2, 2025, over the Yellowstone region by the Sentinel-1 satellite system. Colored fringes indicate a change in distance (called range change) between the satellite and ground surface that is caused by surface deformation during the time spanned.

EarthScope engineers Brendan Hodge (left) and Lia Lajoie (right) perform upgrades at the WLWY (White Lake) continuous GPS station in Yellowstone National Park.  The white box contains the receiver, while the barrel on the ground contains batteries.  The tower holds the solar panels, as well as a cellular modem and meteorological sensors that were recently

Imperial Geyser in eruption.  The geyser, which apparently formed in 1927, is located in Lower Geyser Basin, Yellowstone National Park.

Lidar shaded relief map of the Porcelain Basin and Back Basin areas of Norris Geyser Basin in Yellowstone National Park.  Orange star indicates the location of a new thermal pool that formed sometime during late December 2024 to early February 2025.

Animated GIF of high-resolution satellite images of the Porcelain Basin area of Norris Geyser Basin, Yellowstone National Park, showing the development of a new thermal pool in the circled area.  There is no indication of the pool in images from October 19 and December 19, 2024.  A small depression is visible in the January 6, 2025, image.  In the Feb

This frame capture of a video from a webcam shows a small eruption emanating from Black Diamond Pool in Biscuit Basin, a subbasin of Upper Geyser Basin in Yellowstone National Park, on May 31, 2025.  This was the site of a hydrothermal explosion on July 23, 2024.

Image from the webcam installed at Biscuit Basin in Yellowstone National Park.  The view is of Black Diamond Pool, where a hydrothermal explosion occurred on July 23, 2024 (many of the rocks behind and to the right of the pool were deposited during that event).  The background cliff is the Summit Lake rhyolite lava flow, which is about 111,000 years old.&n

Temporary webcam deployed on the boardwalk in Biscuit Basin, Yellowstone National Park.  The pan/tilt/zoom camera provides a static view every 15 minutes and records video on site for later download as needed.  Black Diamond Pool, site of a hydrothermal explosion on July 23, 2024, is in the background.  This work was completed under Yellowstone Nation