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The methods could be used across other materials, pipe geometries, noise levels or guided wave modes, allowing the full range of sensor performance parameters, defects sizes and types and operating modalities to be explored.

Geological Survey and California Geological Survey released a 48-page report detailing the latest science of where the Hollywood fault sits, based on a new fault-finding technique called guided wave.

The upgraded sites will have red-light warnings, backup generators and batteries, plus guided wave sensors.

Also called line radio communication; carrier frequency telephony, carrier current telephony; guided wave telephony and wired wireless.