I am Li Wang, a Ph.D. candidate working on a geophysics project associated with the Axial Seamount. Thanks for running the well-maintained database. The data I downloaded from IRIS is the vertical component of the broadband seismometer (BHZ) and differential pressure gauge (HDH) of station AXCC1 deployed from 2015.03.04 to 2020.12.31. The displacement-to-pressure ratio calculated from these data is far from synthetic predictions.
For benchmark purposes, I downloaded three instruments of the pressure gauge — HDH (200 sps), LDH (1 sps) from the IRIS, and Nano Bottom Pressure Recorder (20 sps) from the OOI Data Access & Visualization. I checked the differences between the three pressure data. After the same data preprocessing (remove the trend, the mean, taper, and a bandpass filter of 0.1-0.3Hz), we found the amplitude of three instruments are very different: The amplitudes of HDH and LDH are almost identical, both are much larger than Nano-BPR.
I suspect that I might mess up with the gain of these instruments, but neither the instrument responses of HDH and LDH downloaded from IRIS has an effective response for removal.
I am just wondering do you have any idea about how to deal with the instrument response of these pressure gauges or point me to someone who might know about it. I am grateful for your help and looking forward to your response.
WANG Li, Ph. D. candidate
School of Earth Science and Engineering
No.163 Xianlin Rd, Qixia District, Nanjing, Jiangsu 210023