(no subject)

I was right. When the building makes that creaking noise, it's an earthquake.

A microearthquake occurred at 8:16:08 PM (PDT) on Wednesday, September 15, 2004.
The magnitude 2.1 event occurred 3 km (2 miles) N of Piedmont, CA.
The hypocentral depth is 5 km ( 3 miles).