James W. Hendley
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View article: Progress toward a safer future since the 1989 Loma Prieta earthquake
Progress toward a safer future since the 1989 Loma Prieta earthquake Open
The 1989 Loma Prieta earthquake interrupted several decades of seismic tranquility in the San Francisco Bay Area. It caused damage throughout the region and was a wakeup call to prepare for potentially even more damaging future quakes. Sin…
View article: A sight "fearfully grand": eruptions of Lassen Peak, California, 1914 to 1917
A sight "fearfully grand": eruptions of Lassen Peak, California, 1914 to 1917 Open
On May 22, 1915, a large explosive eruption at the summit of Lassen Peak, California, the southernmost active volcano in the Cascade Range, devastated nearby areas and rained volcanic ash as far away as 280 miles to the east. This explosio…
View article: California's restless giant: The Long Valley Caldera
California's restless giant: The Long Valley Caldera Open
Scientists have monitored geologic unrest in the Long Valley, California, area since 1980. In that year, following a swarm of strong earthquakes, they discovered that the central part of the Long Valley Caldera had begun actively rising. U…
View article: Pre-1980 eruptive history of Mount St. Helens, Washington
Pre-1980 eruptive history of Mount St. Helens, Washington Open
On May 18, 1980, Mount St. Helens, Washington, exploded in a spectacular and devastating eruption that brought the volcano to the attention of the world.Few people realized that Mount St. Helens had long been the most active volcano in the…
View article: Red Mountain volcano: A spectacular and unusual cinder cone in northern Arizona
Red Mountain volcano: A spectacular and unusual cinder cone in northern Arizona Open
Red Mountain, located in the Coconino National Forest of northern Arizona, 25 miles northwest of Flagstaff, is a volcanic cinder cone that rises 1,000 feet above the surrounding landscape. It is unusual in having the shape of a "U," open t…
View article: The "LARSE" Project - Working Toward a Safer Future for Los Angeles
The "LARSE" Project - Working Toward a Safer Future for Los Angeles Open
The Los Angeles region is underlain by a network of active faults, including many that are deep and do not break the Earth's surface. These hidden faults include the previously unknown one responsible for the devastating January 1994 North…
View article: Understanding earthquake hazards in southern California - the "LARSE" project - working toward a safer future for Los Angeles
Understanding earthquake hazards in southern California - the "LARSE" project - working toward a safer future for Los Angeles Open
The Los Angeles region is underlain by a network of active faults, including many that are deep and do not break the
\nEarth’s surface. These hidden faults include the previously
\nunknown one responsible for the devastating January 1994
\…
View article: Rivers of gold; placer mining in Alaska
Rivers of gold; placer mining in Alaska Open
of Gold Placer Mining in Alaska O f all the gold ever mined in the world, approximately 1 to 2% (more than 33 million ounces) has come from Alaska.Seventy-two percent of this Alaskan gold was mined from placer deposits gold accumulations i…
View article: Creating an effective fact sheet
Creating an effective fact sheet Open
M/* act Sheets are a power-JL ful way for USGS scientists to rapidly communicate the results of their work directly to the public. These concise official publications can be particularly useful in helping readers understand and live with n…
View article: What are volcano hazards?
What are volcano hazards? Open
First posted June 8, 1997 For additional information, contact: Contact InformationVolcano Science Center - Menlo ParkU.S. Geological Survey345 Middlefield Road, MS 910Menlo Park, CA 94025 Volcanoes give rise to numerous geologic and hydrol…
View article: Quake Forecasting- An Emerging Capability
Quake Forecasting- An Emerging Capability Open
arth scientists have begun JLlrf to forecast damaging earthquakes in California.Although quake forecasting is still maturing, it is now reliable enough to make official earthquake warnings possible.These warnings help government industry, …
View article: Uncovering Hidden Hazards in the Mississippi Valley
Uncovering Hidden Hazards in the Mississippi Valley Open
Hazards he central Mississippi JL Valley has more earthquakes than any other part of the United States east of the Rocky Mountains.The geologic structures related to the causes of these quakes lie deeply buried by sedimentary deposits.Ongo…
View article: Invisible CO2 gas killing trees at Mammoth Mountain, California
Invisible CO2 gas killing trees at Mammoth Mountain, California Open
Since 1980, scientists have monitored geologic unrest in Long Valley Caldera and at adjacent Mammoth Mountain, California. After a persistent swarm of earthquakes beneath Mammoth Mountain in 1989, earth scientists discovered that large vol…
View article: The Mississippi Valley-"Whole Lotta Shakin' Goin' On"
The Mississippi Valley-"Whole Lotta Shakin' Goin' On" Open
aWhole Lotiu On n the winter of 1811-12, the central Mississippi Valley was struck by three of the most powerful earthquakes in U.S. history.Even today, this region has more earthquakes than any other part of the United States east of the …
View article: Make your own paper fossils; a computer animation and paper models
Make your own paper fossils; a computer animation and paper models Open
This report illustrates, by means of computer animations and paper models, how two organisms, a trilobite and a nautiloid, became fossils.The report is intended to help students and others visualize the size and shape of a trilobite and a …