Distributed Acoustic Sensing (DAS) is becoming an increasingly popular technology for monitoring critical infrastructures such as gas and liquid pipelines, perimeters, traffic tunnels, or high voltage power cables. As the technology often uses pre-existing optical telecommunications fiber as a linear sensor, DAS is advantageous over point sensors in terms of cost and performance.
Similarly, DAS technology can be used for geophysical and hydrological monitoring and research, including monitoring seismic activity. While earthquakes are typically monitored by traditional seismograph sensors, utilizing DAS for earthquake monitoring provides new opportunities for precise data collection and advances in the field.
In 2019, AP Sensing’s DAS system was used for preliminary earthquake observations and research at the University of Tokyo. Data was collected throughout a period of 46 hours for seafloor observation; many micro-earthquakes were recorded as well as one deep earthquake below the Sea of Japan. One DAS interrogator unit was installed temporarily in the landing station and data was collected over 100 km with a spatial resolution of 5 m and sampling frequency of 500 Hz. The data from the DAS measurement will be used in a comparison with data from seismometers of the Sanriku seafloor observation system.
AP Sensing DAS used for Earthquake Monitoring Pilot Observations
AP Sensing News 08/27/2020
Click hereto access the academic paper about the seismic observations in Japan
and here to learn more about AP Sensing earthquake monitoring solution.