Thanks! :)

Indeed! And thanks; it is what it is. The community is being really gracious and supportive.

Thanks, Sue! I know there are groups at Penn State and MIT using local fibers. To my knowledge, they’ve been looking at ambient wavefields and mine blasts. I’m unaware of groups probing fibers in places like the NMSZ. There are some great targets! Need a fiber, an interrogator, and data storage :).

Thanks, Eli! You’ve done an excellent job with this :). This work is a super important development towards using fibers to monitor active volcanic processes.

Ah, I’m very sorry for your loss. It sounds like he was a wonderful scientist, educator, and person. And that he left a great legacy.

No problem! Just finished my phd at Caltech. Now a postdoc with the usgs.

Yep, I think you may be thinking of this paper from the same group: doi.org/10.1126/scia.... Same technology used to make the measurements, but they used tomography to image the magma chamber under the long valley caldera. These units use single freq. narrow linewidth lasers.

With these observations we can do all sorts of interesting science. We use these measurements to invert for fine-scale profiles of Moho depth throughout SoCal. We find that the Garlock Fault penetrates the mantle and offsets the Moho. We also see a “Moho plateau” under the Coso Volcanic Field.

We simply use autocorrelation to find the Moho reflected phase. This works really well because the direct phase and the Moho phase generate similar scattered waves. When applied to several dozen SoCal EQs, we end up with over 200,000 observations that sample the Moho that are as clear as day!