Inconsistant Clock Timing for Southern Hydrate Hydrophone

HelpDesk
1

Hi, I’m using OOI hydrophones to measure low-frequency receptions of the Kauai Beacon.

The Southern Hydrate Hydrophone has some sort of clock drift issue that is evident in figure 6.3(b) of my dissertation..

2

Hi John,

Thanks for flagging this. Just to clarify - you are referring to figure 6.3(g) correct? In your dissertation that is the subfigure you mention for the clock drift.

3

I am jumping in here because the timing problems also appear to impact the seismic data. It is left panel of Figure 6.3(g) which appears to show that there was a variable clock error for entirety of March 2023-March 2024 (all the data analyzed). From conversations with Dana Manalang, I understand there have been efforts to resync the clock during this interval but it is not easy to determine whether they have worked. I do not know whether there is a way to flag potential timing errors in the Earthscope (IRIS) data management system.

4

Hi John and William,

A hard reboot of the digitizer on the Southern Hydrate Ridge broadband seismometer (OBSBBA101) was conducted on November 21st at 19:56 UTC. This should fix the clock drift for both that seismometer and the associated low-frequency hydrophone (HYDLFA104). Thanks for catching and reporting the issues.

Orest