DAS based microseismic monitoring

It could only detect the strain rate. We could detect the distance from the profile but we would get a circle for we don’t know the direction. Thus we need vertical and horizontal fiber, then we could get the accurate location of the microseismic event. If we have more fibers, that would be better. So as the borehole measurement.

Dark fiber

They have a very, very large range and density under the city or under the ocean.

Case Study

Aftershock monitoring

Collect the DAS data using the dark fiber.

Surface wave: Rayleigh & Love Waves

I’m familiar with this.

Interferometric analysis

By stacking the cross-correlation data between one station to another station, we could obtain the seismic wave generated by the virtual source.