Canie mentioned it I think on the Haiti anniversary thread.
Hmm, I checked the LA weather for today and tomorrow...80 and sunny: I will go for a skate or x-country ski today when not working, and tomorrow we will have sleet, freezing rain, rain, then snow. Yes, that burst of microquake activity that showed up on the maps in southernmost California last week stopped abruptly, and yes, it seems a bit quiet now in California. We (on this page) have noticed this for the last decade (activity followed by inactivity over the whole state) and I have never heard an explanation and I don't have one.

The question is whether this is real, or if it has to do with the networks. Could weather influence how small the quakes are that can be detected (say, wind). Or, could wind,or traffic, or ocean waves cause sensitive networks to show microquakes that are not "real". Ocean waves do cause background noise detected on seismometers; I once had a seismolgist ask me about whether there were large ocean waves because seismometers were noisy (there were). As for chance, sure, you expect some clustering of, say, M3s, but the sample size for all quakes on the map is so large that I doubt that chance explains it.
Thoughts people?
Chris