I heard that there is an over 70% chance that there will be another California earthquake, magnitude 6 or higher, as followup to yesterday's quake.
Also as a followup, the city of Los Angeles is going to make a software change. This year they released an app named Shake Alert LA that notifies residents if a quake is starting and is likely to cause damage in Los Angeles county. But people are complaining that it didn't alert anyone to this week's 6.4 earthquake. The reason is that the quake in central California was estimated to register as 4.5 in L.A. county, below the app's "likely to cause damage" threshold of 5.0. Since the quake did in fact cause damage, the city has announced that it will lower the notification threshold.
People will complain either way, we have a tsunami warning system where I live that has a tendency to over alert on the possible affected area and a lot of people get upset because they get the alerts.