Seismic waves are studied by geophysicists called seismologists. Seismic waves are studied by seismologists and measured by a seismograph or seismometer. Seismologists study earthquakes and try to understand where they will strike. The next day, seismologists installed three seismic recorder stations. Seismologists studying this pattern believe that each earthquake may trigger the next. Seismic moment is a quantity used by seismologists to measure the size of an earthquake. Hough states that "most seismologists" do not believe this quake was "predicted" "per se". These characteristics allow seismologists to determine the hypocentre of an earthquake using first-arrival methods. Most tremors are of a magnitude below 2.5, and so noteworthy only to seismologists. A couple of new techniques to measure magnitude are in the development stage by seismologists. Mainstream seismologists remain unconvinced by any of VAN's rebuttals. Most seismologists consider VAN to have been "resoundingly debunked". It has been studied by seismologists for many years. However, seismologists found Behring's claims to be unproven. Other seismologists tested and then accepted Lehmann's explanation.