Seismographic events are events that can be measured by a seismograph, such as earthquakes. Earthquakes, also known as QUAKES, are the most common type of seismographic event and are caused by the sudden release of energy in the Earth's crust. This energy is usually released in the form of seismic waves, which can cause significant damage to buildings and other structures. Other types of seismographic events include volcanic eruptions, landslides, and tsunamis.