Science news articles about 'parkfield calif'

... the necessary precision and reliability." In experiments near Parkfield, Calif., in late 2005 and early 2006 ... only with very precise instruments. For example, though the Parkfield instruments were more than a half mile below ground ...

PARKFIELD, Calif., July 9 (UPI) -- U.S. scientists say they observed changes in seismic wave speeds before two small California earthquakes -- a finding that might lead to quake forecasts.

... miles away in the San Andreas fault at Parkfield, Calif. "We found that an earthquake that happened halfway around ... waves from the Indian Ocean earthquake were passing the Parkfield area were recorded on a number of instruments as far ...

... off tremors nearly 9,000 miles away in the San Andreas fault at Parkfield, Calif ...

... segment of the San Andreas Fault near Parkfield, Calif. The research is reported in the July 10 ... in frequency afterward and was six times more frequent after the Parkfield quake. Most of the activity occurred along a 25 ...

... , examined more than 20 years of seismic records from Parkfield, Calif., which sits astride the San Andreas ... quake north of Palm Springs, Calif. -- about 200 miles from Parkfield -- caused the first of these changes ...

PARKFIELD, Calif., Dec. 2 (UPI) -- Strange variations in earthquake activity along the San Andreas Fault in California may be due to saltwater seeping into the rocks, researchers say.

... fault that Nadeau developed and maintained. The data were from Parkfield, Calif., an area which has experienced a series of magnitude ... on the same fault patches. "Immediately after the 2004 Parkfield earthquake, many nearby earthquakes that normally recurred ...