Not usually a good sign.
I’d get radon monitors in place ASAP
This can sometimes be a precursor of a shallow quake of sizable amplitude.
A jump in radon would validate it as a clear possibility.
12/30/2016, 2:26:01 PM by Zathras
San Fran is about due for another Pacific Rim Job isn’t it?
Herd all the natives out on the Bay Bridge....
I recall reading reports of foul odors and even unusual darkness immediately preceding the New Madrid quake.
As deluded and immoral as much of the populace appears to be in San Francisco, I wouldn’t wish that upon them or even laugh about it. It’s a beautiful, iconic American city that’s been unfortunately taken over by the left.
The Lord spared Nineveh out of mercy for the many cattle there.
Bump
The city/county could get together with the usgs to monitor radon, tc, i would imagine.
I would also imagine that the hayward fault is actually overdue to pop and so also at risk simply by way of the calendar...