Eathquakes, temblors, tremblors are all the same thing. The unit of measurement is the moment magnitude(similar to richter for intermediate values-more accurate for higher values)
As I said previously research is ongoing, and instrumentation is   becoming more sensitive, as is computing power and analysis. %0 years ago the analysis carried out today would have been merely a dream, with each passing decade more and more is possible(egSchlumberger cutting edge techniques and instrumentation)
A lot of the relevant science is in it's infancy. I think some real progress is very close. Part of the problem is that today science is divided into increasingly specialised compartments. In reality there is no such beast as a geologist anymore, the field is too wide.
While we know much about seismology, rock mechanics and soil mechanics and meteorology, cross fertilisation between the disciplines is too much of a rarity. The thread under discussion highlights the problem admirably.

https://www.earthmagazine.org/article/blame-it-rain-proposed-links-between-severe-storms-and-earthquakes