I Can the LIGO observatories detect (with accuracy) temblors?

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LIGO observatories are highly sensitive instruments primarily designed to detect gravitational waves, not to monitor seismic activity. While they can pick up vibrations from earthquakes, they are equipped to filter out these seismic events to maintain accuracy in their primary function. Standard seismographs are more suited for detecting and analyzing earthquakes, as they can effectively capture seismic data without the need for LIGO's advanced technology. Even inexpensive seismometers can detect earthquakes globally, making them more practical for this purpose. Therefore, while LIGO may register seismic activity, it is not necessary for earthquake detection.
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With all the earthquakes going on in CA - and that the last one (7.1 mag) was strong enough to possibly trigger a small quake along the LA coast (i.e., as in LouisianA, not Los Angeles) - I was wondering about this. These instruments are so sensitive that they have to pick something up, even in LA & WA. I presume that they can discern when a temblor happens and zero out the effect.
 
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Yes. But you don't need LIGO for that. Any decent seismograph will see those earthquakes.
 
They have seismometers and discard measurements during earthquakes. LIGO is designed to be as decoupled from seismic events as possible. Meanwhile even quite cheap seismometers can pick up these earthquakes from all over the world.

Here is a hobby device in Australia by @davenn
 

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