After using two methods of nonprofessional seismic screening on a Berkeley apartment building in 2010, I have now tried a third method. Its results seem to indicate more risk of structural damage than the other methods did. All these methods, however, when applied by laypersons like me, are of questionable value.
A California law that just became effective for multi-family residences such as Berkeley Town House will mandate the replacement of about 70 water-wasting toilets within 5 years. The question then arises: How should this be done?