Belle Philibosian in a trench investigating the West Napa Fault near St. Helena, California, August 2017.
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Earthquake Hazards Program images.
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Trench Across West Napa Fault, California
Belle Philibosian in a trench investigating the West Napa Fault near St. Helena, California, August 2017.
Earthquake Alerts: Early and Often? Or Possibly Late?
Earthquake Alerts: Early and Often? Or Possibly Late?The choice when issuing earthquake warnings is to: 1) issue alerts for weak shaking and potentially provide long warning times, but risk sending alerts for the many events that do not go on to produce damaging ground shaking, or 2) issue alerts only when ground shaking is expected to be damaging, with the tradeoff that the alert will be sent much later, reducing
Earthquake Alerts: Early and Often? Or Possibly Late?
Earthquake Alerts: Early and Often? Or Possibly Late?The choice when issuing earthquake warnings is to: 1) issue alerts for weak shaking and potentially provide long warning times, but risk sending alerts for the many events that do not go on to produce damaging ground shaking, or 2) issue alerts only when ground shaking is expected to be damaging, with the tradeoff that the alert will be sent much later, reducing
Pool sign warns first responders
Swimming pool sign spray-painted to warn first responders and others to be careful around the potentially dangerous area.
Swimming pool sign spray-painted to warn first responders and others to be careful around the potentially dangerous area.
Montecito after debris flow
The Dec. 4, 2017 Thomas fire, Southern California's largest wildfire on record, burned more than 280,000 acres across Ventura and Santa Barbara counties for nearly a month.
The Dec. 4, 2017 Thomas fire, Southern California's largest wildfire on record, burned more than 280,000 acres across Ventura and Santa Barbara counties for nearly a month.
Geologists assess scene after debris flow
Geologists assess boulders displaced during the Montecito debris flow event on Jan. 9, 2018.
Geologists assess boulders displaced during the Montecito debris flow event on Jan. 9, 2018.
Geologists assess damage after debris-flow event
USGS geologists deployed to Santa Barbara County to support a geohazard assessment of the Montecito area
USGS geologists deployed to Santa Barbara County to support a geohazard assessment of the Montecito area
California Seismicity
Map of historic seismicity, major faults, and paleoseismic summary of San Andreas Fault system.
Map of historic seismicity, major faults, and paleoseismic summary of San Andreas Fault system.
Teton Fault
Mark, Nicole, Rich, Ryan, Dean taking out the "trash" from the base of the trench.
Mark, Nicole, Rich, Ryan, Dean taking out the "trash" from the base of the trench.
Trench Across West Napa Fault, California
Belle Philibosian next to a trench investigating the West Napa Fault near St. Helena, California, September 2017.
Belle Philibosian next to a trench investigating the West Napa Fault near St. Helena, California, September 2017.
Drowned Forest in Girdwood, AK from 1964 Alaska Earthquake and Tsunami
Drowned Forest in Girdwood, AK from 1964 Alaska Earthquake and TsunamiShaking during the 1964 Alaska earthquake was felt as far away as Seattle, Washington, and its tsunamis caused 129 fatalities and about \$2.3 billion in property losses (2013 dollars).
Drowned Forest in Girdwood, AK from 1964 Alaska Earthquake and Tsunami
Drowned Forest in Girdwood, AK from 1964 Alaska Earthquake and TsunamiShaking during the 1964 Alaska earthquake was felt as far away as Seattle, Washington, and its tsunamis caused 129 fatalities and about \$2.3 billion in property losses (2013 dollars).
Glacier Bay National Park
View of Glacier Bay National Park from the air.
View of Glacier Bay National Park from the air.
South Crillon Glacier
Nearly 60 years after a magnitude 7.7 earthquake struck Lituya Bay, Alaska — leading to a tsunami that devastated the area — six U.S. Geological Survey geologists revisited the isolated region of Alaska, to pick up where their scientific predecessors left off.
Nearly 60 years after a magnitude 7.7 earthquake struck Lituya Bay, Alaska — leading to a tsunami that devastated the area — six U.S. Geological Survey geologists revisited the isolated region of Alaska, to pick up where their scientific predecessors left off.
Fairweather Fault
USGS research geologist Kate Scharer with her finger on the Fairweather Fault in southeast Alaska. The magnitude 7.8 Lituya Bay earthquake caused shaking that toppled trees along the fault, which left a break in the forest shown here.
USGS research geologist Kate Scharer with her finger on the Fairweather Fault in southeast Alaska. The magnitude 7.8 Lituya Bay earthquake caused shaking that toppled trees along the fault, which left a break in the forest shown here.
South Crillon Glacier
Periodic calving of ice from the snout of South Crillon Glacier.
Periodic calving of ice from the snout of South Crillon Glacier.
Glacier Bay National Park
Trench site along the southern Fairweather Fault, in Glacier Bay National Park, Alaska. The alluvial fan at left consists of lake, stream channel and debris flow deposits impounded by the Fairweather Fault scarp, at right.
Trench site along the southern Fairweather Fault, in Glacier Bay National Park, Alaska. The alluvial fan at left consists of lake, stream channel and debris flow deposits impounded by the Fairweather Fault scarp, at right.
Alaska field team
The field team included USGS geologists Rob Witter, Adrian Bender, Chris DuRoss, Peter Haeussler, Richard Lease and Kate Scharer
The field team included USGS geologists Rob Witter, Adrian Bender, Chris DuRoss, Peter Haeussler, Richard Lease and Kate Scharer
Standing Masonry Buildings in Kathmandu, Nepal
Standing masonry buildings in Kathmandu suggest that shaking was not amplified in the valley sediments surrounding Kathmandu
Standing masonry buildings in Kathmandu suggest that shaking was not amplified in the valley sediments surrounding Kathmandu
Damaged Monument Kathmandu, Nepal
Major damage was more likely to monuments in Kathmandu, Nepal than more modern structures
Major damage was more likely to monuments in Kathmandu, Nepal than more modern structures
Rock Slide in Nepal from an Earthquake in April of 2015
Rock Slide in Nepal from an Earthquake in April of 2015Villagers in Kerauja below a rock slide that resulted from a magnitude 7.8 earthquake on April 25, 2015 in Gorkha district, Nepal.
Rock Slide in Nepal from an Earthquake in April of 2015
Rock Slide in Nepal from an Earthquake in April of 2015Villagers in Kerauja below a rock slide that resulted from a magnitude 7.8 earthquake on April 25, 2015 in Gorkha district, Nepal.
USGS Geologists Inspecting Fault Trace in a Trench
USGS Geologists Inspecting Fault Trace in a TrenchView of geologists pointing to fault in a trench dug across one of the ruptures from the 2014 South Napa earthquake. From front to rear: Alexandra Pickering, Suzanne Hecker, Aaron Page (all USGS). Trench located approximately 3 miles NW of downtown Napa, CA.
USGS Geologists Inspecting Fault Trace in a Trench
USGS Geologists Inspecting Fault Trace in a TrenchView of geologists pointing to fault in a trench dug across one of the ruptures from the 2014 South Napa earthquake. From front to rear: Alexandra Pickering, Suzanne Hecker, Aaron Page (all USGS). Trench located approximately 3 miles NW of downtown Napa, CA.
San Jose Earthquakes' Avaya Stadium
San Jose Earthquakes' Avaya Stadium.