I think there is a good chance that they will come around if we can successfully build its case. The used to believe that the earth was in motion before FET, after all. At the very least, newcomers will be more informed.
Another gravimeter = seismometer reference:
https://orkustofnun.is/gogn/unu-gtp-sc/UNU-GTP-SC-10-0405a.pdf on p.4
An important factor in obtaining useful gravity values in detailed surveys is determining the earth tide effect as their gravitational effects may be greater than the gravity field variations due to the anomalous features being sought. The final aspect of reading a gravity meter concerns seismic activity or cultural movement such as those of vehicles or people. These will disrupt the readings (the meter is actually a low-frequency seismometer) and even though the Scintrex meter has an anti-seismic filter (the La Coste-Romberg meters are also mechanically damped to lessen the effects of earthquakes), readings will still be disrupted.
The author is Dr. Nicolas O. Mariita. Again, we see that the gravimeter is actually a seismometer.
Recall from above that the seismometer was detecting gravity tides on subseismic bands, which was described as:
'subseismic band' (i.e. frequency lower than 0.03mHz) that has very strong background noise;
So, the gravimeter is a low-frequency seismometer, taking data out of those low-frequencies.
In the introduction of that paper Dr. Mariita tells us about what gravimetry depends on:
The success of the gravity method depends on the different earth materials having different bulk densities (mass) that produce variations in the measured gravitational field. These variations can then be interpreted by a variety of analytical and computers methods to determine the depth, geometry and density that causes the gravity field variations.
He tells us about the Bouguer anomalies previously mentioned, and the volcanoes:
The most commonly used processed data are known as Bouguer gravity anomalies, measured in mGal. The interpretation of Bouguer gravity anomalies ranges from just manually inspecting the grid or profiles for variations in the gravitational field to more complex methods that involves separating the gravity anomaly due to an object of interest from some sort of regional gravity field. From this, bodies and structures can be inferred which may be of geothermal interest.
Volcanic centres, where geothermal activity is found, are indicators of cooling magma or hot rock beneath these areas as shown by the recent volcanic flows, ashes, volcanic domes and abundant hydrothermal activities in the form fumaroles and hot springs. Gravity studies in volcanic areas have effectively demonstrated that this method provides good evidence of shallow subsurface density variations, associated with the structural and magmatic history of a volcano. There is a correlation between gravity highs with centres of recent volcanism, intensive faulting and geothermal activity. For example, in the Kenya rift, Olkaria, Domes and Suswa geothermal centres are located on the crest of a gravity high.
This seems to confirm, to me, that:
- A gravimeter is a seismometer
- It takes data from subseismic bands that have lots of noise
- Analysis and filtering is performed under the theory that the different bulk densities of the earth create variations, causing these slight vibration trends