NASA officials have said that the plane was flying as part of a mission to study the effects of fire smoke on air quality.
Two strong earthquakes hit Southern California on July 4 and 5.
USGS scientist addresses spike in internet searches for Yellowstone caldera after the quakes.
This amounts to one earthquake hitting the region every three minutes.
A new report from the U.S. Geological Survey assesses the risk of volcanic eruptions across the state.
"It's a slow-moving disaster," an Imperial County official said.
In 1906, a powerful 7.9 magnitude earthquake caused the deaths of up to 3,000 people and destroyed more than 80 percent of the city of San Francisco.
Geologists have identified a new type of fault movement at San Andreas.
Other vulnerable countries have had systems in place for years.
New evidence has found that the San Jacinto Fault zone, in California, is not as quiet as we thought and may be due for a big quake.
The finding helps us understand what triggers earthquakes—and when they are more likely to strike.
The fault continued to slip for 12 years after the 2004 Parkfield earthquake—a level of movement that has major implications for the Hayward Fault, which is set to rupture near San Francisco.