Abstract
Distributed Acoustic Sensing (DAS) is a promising technique to improve
the rapid detection and characterization of earthquakes. Due to some
instrumental limitations, current DAS studies primarily focus on the
phase information but less on the amplitude information. In this study,
we compile earthquake data from two DAS arrays in California, USA, and
one submarine array in Sanriku, Japan. We develop a data-driven method
to obtain the first scaling relation between DAS amplitude and
earthquake magnitude. Our results reveal that the DAS amplitude in
different regions follows a similar scaling relation. The scaling
relation can provide a rapid magnitude estimation and effectively avoid
uncertainties caused by the conversion to ground motions. We finally
show that the scaling relation is transferable from one to another new
region. The scaling relation highlights the great potential of DAS in
earthquake source characterization and early warning.