REF TEK seismic equipment has, over its 40 years of production, been used in every climate extreme on earth as well as populous urban areas. Our high-resolution seismic recorders, high-resolution strong motion recorders, broadband and accelerometer sensors have been used in a wide variety of seismic and earthquake engineering applications. Structural monitoring, oil platform monitoring, active source experiments and, of course, aftershock studies and wide spread early warning systems.