Looking at all available geotagged tweets within 1,000km of the epicenter for the first SoCal earthquake, it look approximately 45-60 seconds after the quake before tweet volume started to really ramp up. This is looking at 1 second intervals. Need to reduce radius to ~100km.
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3 hour view (one minute intervals) of the first quake (6.4) -- Within 1,000km of the epicenter.
