Images

On May 11, Ruy Finch and W.O. Clark visited Halemaumau and found a rock fragment weighing about 180 kg (400 pounds) that had been thrown 60 meters (200 feet) from the rim of the crater.

Later scientists at the Observatory listed May 10 as the first day of the eruptive series. Between this date and May 27, they carefully recorded all explosions, ballistic falls, electric storms, and muddy rains as well as earthquakes felt and recorded on seismographs.

After the severe earthquake swarm in lower Puna subsided, seismic tremor became more pronounced at the summit of Kīlauea Volcano. The floor of the crater of Halemaumau continued to collapse.

Scientists looking into the bright glow of Mauna Loa's 1942 eruptive vent. Eruption occurred during WWII and was not publicized to prevent Japanese war planes from navigating to the island at night.

On April 22, an observer at the Kapoho railroad quarry counted 238 felt earthquakes over a period of four hours. By Sunday, April 27, things had calmed considerably at Kapoho, although a dozen shocks were felt during the day and half a dozen more overnight.

These tracks were damaged by the vertical drop along the zone of cracks and faults that ran parallel to the east rift zone of Kīlauea Volcano. Witnesses reported that where the railroad entered the valley, the ties and rails were swinging like a suspension bridge for a distance of about 61 meters (200 feet).

By April 22, 1924, the incessant earthquakes caused many people to leave the district. When Hilo Tribune Herald reporter Jazz Belknap reached the Kapoho train station, he found a great crowd waiting for the autos that were hauling passengers out of the district.

Valley of Ten Thousand Smokes in Katmai National Park, circa 1922. Windy Creek is in the foreground. Following the June 6, 1912 eruption of Novarupta-Katmai, thousands of fumaroles filled the valley for many years. Buried snow fields, glacial streams, and precipitation were converted to steam by the heat trapped in the pyroclastic flow.

Lassen Peak photographed from the Devastated Area about 4 hours before the explosive eruption of May 22, 1915.

Lassen Peak photographed from the Devastated Area prior to the 1914-1915 eruption that changed the landscape.

1906 earthquake damage to home on Howard and 17th Streets in San Francisco. Liquefaction, the phenomenon of saturated soils losing their stiffness and strength during shaking, caused structures to tilt and collapse.

One of the most well-known photographs by George R. Lawrence, taken May 28, 1906, about 6 weeks after the Great San Francisco earthquake which occurred on April 18. The 160-degree panorama was taken from a camera suspended from a kite 2,000 feet in the air. The view looks up Market Street with the waterfront and Union Ferry Building in the foreground.

Geothermal ice cave at Mount Baker's summit formed by melting of a glacier due to increased heat from subsurface magma and fumarole on the surface expelling hot gasses.

Mount Bachelor viewed from the south. Sparks Lake and South Sister visible in the background. Oregon.

Mount Bachelor's east facing ski slopes at sunrise.

Mount Hood dominates the skyline outside of Portland, Oregon on a clear day. An major eruption of Mount Hood would pose a great hazard to the regional economy.

Mount Hood in the not-so-far distance beyond Downtown Portland, Oregon. Photograph taken at the top of the Portland Aerial Tram line on Marquam Hill.

Glacier Peak volcano, Washington reflected in pond below the Whitechuck Glacier, view from the south in late summer.

Visible relief in the hillside exposure is about 800-900 ft. Dusty assemblage deposit occurred approximately between 5100 and 5500 yr B.P. Magma volume of >5 km3, which is a lot for what was probably one eruptive stage. The source lava dome is gone, apparently having disintegrated entirely during extrusion and subsequent glacial interaction.

Hualālai Volcano (center) above Kīholo Bay on Hawai‘i Island's West Coast is flanked by lava flow erupted from the volcano around 1800 (right) and 1859 Mauna Loa flow (left).

CalVO scientist Tom Sisson studies a lava flow in the Harrat Rahat Volcanic Field in Saudi Arabia for an international collaboration with the Saudi Geological Survey to conduct a seismic and volcanic hazard assessment for the volcanic field.