Images

Oblique aerial view of San Andreas Fault (between white arrows) in southeastern Coachella Valley, near Red Canyon; view to the west.

The Mameyes, Puerto Rico, landslide, 1985. This landslide destroyed 120 houses and killed at least 129 people. The catastrophic slide was triggered by a tropical storm that produced extremely heavy rainfall.

Topographic map of the Cape Flattery region (U.S. Geological Survey Cape Flattery Quadrangle, 15-min series).

Three Sisters volcanoes (left to right - South, Middle, and North) viewed from the south, Oregon. Foreground rhyolite Newberry flow is one of most recent eruptive units (2.2 ka).

The lava dome was taller than a 66-story building and almost as wide as the length of nine football fields. The dome completely fills the camera's field of view. Compare with image taken August 22, 1981 from the same location with the same camera.

U.S. Geological Survey streamflow-gaging station 08110500 Navasota River near Easterly, Texas, looking upstream from left bank, July 22, 1985.

SIR 2009–5174

Water flow in the underlying cavity associated with Ledges Sink.

Logs that fall through the overlying bedrock litter the cavern floor.

Roots break through the overlying bedrock of the cavern.

Wil Causseaux climbs through the opening of Ledges Sink to the underlying caverns.

The control structure between Lake Alice and Lake Irvine in 1985.

USGS Hawaiian Volcano Observatory scientists monitor Mauna Loa, the largest active volcano on Earth. In this 1985 aerial photo, Mauna Loa looms above Kīlauea Volcano’s summit caldera (left center) and nearly obscures Hualālai in the far distance (upper right).

Maps showing lava flow progression during the 1984 eruption of Mauna Loa. These maps were featured in the Hawai‘i Tribune-Herald newspaper on March 27, 1984 (top) and March 30, 1984 (bottom). 

Tule white-fronted goose in the Kahiltna Valley, Alaska, in 1984.

Mount St. Helens four years after the May 18, 1980 eruption—lava dome in the crater and drainage channels development on flanks; view from Johnston Ridge.

Vegetation began reappearing as early as the summer of 1980 as many small trees and plants were protected by the snowpack on May 18. Seeds, carried by the wind or by animals, also entered the area and grew. By 1985, the ridges surrounding the volcano were covered with new growth.

An aerial view looking southeast of the treated-wastewater infiltration beds at Joint Base Cape Cod. The wastewater disposal beds (source of the nitrogen contamination) appear in the foreground. In the background is a freshwater pond that is receiving discharge of some of the groundwater contaminants. Toxic waste disposal at the site ended in 1995. 

The strength of the magnetic field increased as the dome cooled and magnetic minerals formed. During the eruptions the strength usually changed rapidly as magma heated and deformed the dome.

Erupting vents on Mauna Loa’s northeast rift zone near Pu‘u‘ula‘ula (Red Hill) on Mar. 25, 1984, sent massive ‘a‘ā lava flows down the rift toward Kūlani.

Harry's Ridge monitoring station, 8 km (5 mi) north of Mount St. Helens' crater.

The May 18, 1980 debris avalanche from Mount St. Helens covered over 24 square miles (62 square kilometers) of the upper Toutle River valley and blocked tributaries of the North Fork Toutle River. New lakes such as Castle Lake (pictured here) and Coldwater Lake were created.