Sensor orientation for borehole installations

Users Mailing List Archive
1

Hi all:

Good day and saludos from Panamá.

I am just doing some reconnaissance and was wondering if there are any modules in ObsPy that were written to determine the orientation of borehole sensors (from first arrival directions, for example).

I have combed through the github and wiki and do not see anything but wanted to make sure.

Thank you!

Saludos,

2

Hi Branden Christensen,

My methon might not fit your application but for your interest.

Normally when I want to know the orientation of borehole sensors, I install a surface seismometer nearby the borehole temporarly (probably 1 hours) as a reference station. Since the microseismic signal is large enough, it is possible to determine their ‘relative orientation’ by searching the maximum of cross-correlation between the reference horizontal components and rotated borehole horizontal components. Filtering the recording by 0.1-10 Hz will make microseismic signal prominent in time-domain.� However, this method is helpful only if the borehole sensor has sufficient resolution to microseismic signal (accelerometer and low-gain seismometer are not sensitive enough).

Best,
Youngman

3

Thank you Youngman!