He served as president of the American Geophysical Union and the Seismological Society of America. She began the task of setting up seismological observatories in Denmark and Greenland. The "Observatorio" began conducting seismological and terrestrial magnetism observations in 1880. Whether the Tangshan earthquake was predicted has had considerable political as well as seismological significance. Earthquake nowcasting is the estimate of the current dynamic state of a seismological system. Archaeological, seismological, and vulcanological evidence has been presented linking the Atlantis myth to Santorini. Slow slip events are frequently linked to non-volcanic seismological "rumbling", or tremor. Journalist Peter Hadfield criticized this claim as being unsupported by seismological records and scientific papers. The European-Mediterranean Seismological Centre put the magnitude at 6.1. Seismological instruments can generate large amounts of data. This one is only sporadically been observed in seismological data. These early operations used Morse code to transmit seismological and weather information. The Bucaramanga segment was recognized in early eighties from limited seismological evidence. It's currently used to house seismological instruments. It has been established in 1975, at the request of the European Seismological Commission (ESC).