Conrad Observatory, Geophysical research observatory in Muggendorf, Austria

The Conrad Observatory is a geophysical research facility in Austria built deep underground on a hillside in Muggendorf, measuring natural processes in and around the Earth. The site operates continuous monitoring equipment in two tunnel systems to detect earthquakes, gravity fluctuations, and variations in Earth's magnetic field.

The observatory was funded by a bequest from Ida F. Conrad, widow of seismologist Victor Conrad, who died in 1962; she required that the building bear his name. Peter Melichar of the ZAMG was tasked with its construction in 1975. The seismic-gravimetric observatory opened in 2002, and the geomagnetic observatory followed on 21 May 2014, replacing the Cobenzl observatory. Both ran in parallel until April 2016 to measure Vienna's electromagnetic interference.

The observatory is named after seismologist and climatologist Victor Conrad (1876–1962), who worked for years at the ZAMG, predecessor of GeoSphere Austria. Its construction was funded by a legacy from his widow Ida F. Conrad, on condition that the building serve geophysical or meteorological research and carry his name. Since 2016 the site has belonged to the international Intermagnet network studying the Earth's magnetic field.

The observatory lies on the Trafelberg at 1146 m above sea level near Muggendorf, about 45 km southwest of Vienna. It is not open to the public, since access would disturb the measurement series; the tunnels and boreholes can only be viewed by arrangement with GeoSphere Austria. Instruments, power supply and temperature are controlled remotely from Vienna.

The tunnels were positioned deep within the mountainside specifically to shield delicate instruments from surface vibrations and weather interference. This underground design allows the facility to detect subtle Earth movements and magnetic changes that surface-based equipment would completely miss.