Using an “interrogator” device to activate 50 miles of dormant fiber-optic cable, Lawrence Livermore National Laboratory seismologists created a network of 8,000 virtual sensors, recording March’s 3.9 magnitude Dublin earthquake with unprecedented detail, achieving 1,000 times the observational density of current seismic networks. “The detail of the seismic wave field was unprecedented,” said Lab seismologist … Continue reading LLNL turns Bay Area fiber into 8,000 virtual seismometers