Each year thousands of banks and other financial institutions report data about mortgages to the public, thanks to the Home Mortgage Disclosure Act, or HMDA for short.
An earthquake is sudden ground movement caused by the sudden release of energy stored in rocks. The earthquake happens when so much stress builds up in the rocks that the rocks rupture. An earthquake's energy is transmitted by seismic waves.
Volcanically-caused long period earthquakes are produced by vibrations generated by the movement of magma or other fluids within the volcano. Pressure within the system increases and the surrounding rock fails, creating small earthquakes.