HP's test and measurement division is now called Keysight which was also called Agilient Technology in between HP and Keysight.
They make/made modern seismographs, my homie got his PhD in electrical engineering in digital signal processing and went to work for them.

You have that a bit backwards.

Agilent still exists (and makes fantastic Chromatography hardware), while Keysight was spun off the spun off Agilent

Agilent Technologies - Wikipedia