How Small Can You Detect with DAS: A Case Study in the Bōsō Peninsula (SAGE/GAGE Workshop)
Channel: Yohanes Nuwara
Date: 2021-08-14

This was the presentation I gave in the SAGE/GAGE Workshop on 13 August 2021. The topic of my research was the application of Distributed Acoustic Sensing (DAS) downhole fiber-optic cable instrument that detects natural earthquakes in the Bōsō Peninsula, Japan. 

We found that the DAS system can detect very small earthquakes down to a magnitude of 0.8 very well. We compared the recordings from both straight and helical cables. We also investigated the effect of well cement integrity on the recordings. Finally, we found that the detectability of DAS depends highly on azimuth and distance from earthquake events. 

It is hoped that our research in Japan inspires more applications of DAS for seismology in other parts of the world. 

(Sorry for the poor audio quality!)